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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5C.c
* June 1 2004
* John Mainzer
*
* Purpose: Functions in this file implement a generic cache for
* things which exist on disk, and which may be
* unambiguously referenced by their disk addresses.
*
* The code in this module was initially written in
* support of a complete re-write of the metadata cache
* in H5AC.c However, other uses for the cache code
* suggested themselves, and thus this file was created
* in an attempt to support re-use.
*
* For a detailed overview of the cache, please see the
* header comment for H5C_t in H5Cpkg.h.
*
* Modifications:
*
* QAK - 11/27/2004
* Switched over to using skip list routines instead of TBBT
* routines.
*
* JRM - 12/15/04
* Added code supporting manual and automatic cache resizing.
* See the header for H5C_auto_size_ctl_t in H5Cprivate.h for
* an overview.
*
* Some elements of the automatic cache resize code depend on
* the LRU list. Thus if we ever choose to support a new
* replacement policy, we will either have to disable those
* elements of the auto resize code when running the new
* policy, or modify them to make use of similar information
* maintained by the new policy code.
*
*-------------------------------------------------------------------------
*/
/**************************************************************************
*
* To Do:
*
* Code Changes:
*
* - Remove extra functionality in H5C_flush_single_entry()?
*
* - Change protect/unprotect to lock/unlock.
*
* - Change the way the dirty flag is set. Probably pass it in
* as a parameter in unprotect & insert.
*
* - Size should also be passed in as a parameter in insert and
* unprotect -- or some other way should be found to advise the
* cache of changes in entry size.
*
* - Flush entries in increasing address order in
* H5C_make_space_in_cache().
*
* - Also in H5C_make_space_in_cache(), use high and low water marks
* to reduce the number of I/O calls.
*
* - When flushing, attempt to combine contiguous entries to reduce
* I/O overhead. Can't do this just yet as some entries are not
* contiguous. Do this in parallel only or in serial as well?
*
* - Create MPI type for dirty objects when flushing in parallel.
*
* - Now that TBBT routines aren't used, fix nodes in memory to
* point directly to the skip list node from the LRU list, eliminating
* skip list lookups when evicting objects from the cache.
*
* Tests:
*
* - Trim execution time. (This is no longer a major issue with the
* shift from the TBBT to a hash table for indexing.)
*
* - Add random tests.
*
**************************************************************************/
#define H5C_PACKAGE /*suppress error about including H5Cpkg */
#define H5F_PACKAGE /*suppress error about including H5Fpkg */
#include "H5private.h" /* Generic Functions */
#include "H5Cpkg.h" /* Cache */
#include "H5Dprivate.h" /* Dataset functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Fpkg.h" /* Files */
#include "H5FDprivate.h" /* File drivers */
#include "H5FLprivate.h" /* Free Lists */
#include "H5Iprivate.h" /* IDs */
#include "H5MMprivate.h" /* Memory management */
#include "H5Pprivate.h" /* Property lists */
#include "H5SLprivate.h" /* Skip lists */
/*
* Private file-scope variables.
*/
/* Declare a free list to manage the H5C_t struct */
H5FL_DEFINE_STATIC(H5C_t);
/*
* Private file-scope function declarations:
*/
static herr_t H5C__auto_adjust_cache_size(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
hbool_t write_permitted,
hbool_t * first_flush_ptr);
static herr_t H5C__autoadjust__ageout(H5F_t * f,
double hit_rate,
enum H5C_resize_status * status_ptr,
size_t * new_max_cache_size_ptr,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
hbool_t write_permitted,
hbool_t * first_flush_ptr);
static herr_t H5C__autoadjust__ageout__cycle_epoch_marker(H5C_t * cache_ptr);
static herr_t H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
hbool_t write_permitted,
hbool_t * first_flush_ptr);
static herr_t H5C__autoadjust__ageout__insert_new_marker(H5C_t * cache_ptr);
static herr_t H5C__autoadjust__ageout__remove_all_markers(H5C_t * cache_ptr);
static herr_t H5C__autoadjust__ageout__remove_excess_markers(H5C_t * cache_ptr);
static herr_t H5C__flash_increase_cache_size(H5C_t * cache_ptr,
size_t old_entry_size,
size_t new_entry_size);
static herr_t H5C_flush_single_entry(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
const H5C_class_t * type_ptr,
haddr_t addr,
unsigned flags,
hbool_t * first_flush_ptr,
hbool_t del_entry_from_slist_on_destroy);
static herr_t H5C_flush_invalidate_cache(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
unsigned flags);
static void * H5C_load_entry(H5F_t * f,
hid_t dxpl_id,
const H5C_class_t * type,
haddr_t addr,
void * udata,
hbool_t skip_file_checks);
static herr_t H5C_make_space_in_cache(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
size_t space_needed,
hbool_t write_permitted,
hbool_t * first_flush_ptr);
#if H5C_DO_EXTREME_SANITY_CHECKS
static herr_t H5C_validate_lru_list(H5C_t * cache_ptr);
static herr_t H5C_verify_not_in_index(H5C_t * cache_ptr,
H5C_cache_entry_t * entry_ptr);
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
/****************************************************************************
*
* #defines and declarations for epoch marker cache entries.
*
* As a strategy for automatic cache size reduction, the cache may insert
* marker entries in the LRU list at the end of each epoch. These markers
* are then used to identify entries that have not been accessed for n
* epochs so that they can be evicted from the cache.
*
****************************************************************************/
/* Note that H5C__MAX_EPOCH_MARKERS is defined in H5Cpkg.h, not here because
* it is needed to dimension arrays in H5C_t.
*/
#define H5C__EPOCH_MARKER_TYPE H5C__MAX_NUM_TYPE_IDS
static void *H5C_epoch_marker_load(H5F_t *f, hid_t dxpl_id, haddr_t addr,
void *udata);
static herr_t H5C_epoch_marker_flush(H5F_t *f, hid_t dxpl_id, hbool_t dest,
haddr_t addr, void *thing,
unsigned *flags_ptr);
static herr_t H5C_epoch_marker_dest(H5F_t *f, void *thing);
static herr_t H5C_epoch_marker_clear(H5F_t *f, void *thing, hbool_t dest);
static herr_t H5C_epoch_marker_notify(H5C_notify_action_t action, void *thing);
static herr_t H5C_epoch_marker_size(const H5F_t *f, const void *thing, size_t *size_ptr);
const H5C_class_t epoch_marker_class =
{
/* id = */ H5C__EPOCH_MARKER_TYPE,
/* load = */ &H5C_epoch_marker_load,
/* flush = */ &H5C_epoch_marker_flush,
/* dest = */ &H5C_epoch_marker_dest,
/* clear = */ &H5C_epoch_marker_clear,
/* size = */ &H5C_epoch_marker_size
};
/***************************************************************************
* Class functions for H5C__EPOCH_MAKER_TYPE:
*
* None of these functions should ever be called, so there is no point in
* documenting them separately.
* JRM - 11/16/04
*
***************************************************************************/
static void *
H5C_epoch_marker_load(H5F_t UNUSED * f,
hid_t UNUSED dxpl_id,
haddr_t UNUSED addr,
void UNUSED * udata)
{
void * ret_value = NULL; /* Return value */
FUNC_ENTER_NOAPI(H5C_epoch_marker_load, NULL)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, "called unreachable fcn.")
done:
FUNC_LEAVE_NOAPI(ret_value)
}
static herr_t
H5C_epoch_marker_flush(H5F_t UNUSED *f,
hid_t UNUSED dxpl_id,
hbool_t UNUSED dest,
haddr_t UNUSED addr,
void UNUSED *thing,
unsigned UNUSED * flags_ptr)
{
herr_t ret_value = FAIL; /* Return value */
FUNC_ENTER_NOAPI(H5C_epoch_marker_flush, FAIL)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.")
done:
FUNC_LEAVE_NOAPI(ret_value)
}
static herr_t
H5C_epoch_marker_dest(H5F_t UNUSED * f,
void UNUSED * thing)
{
herr_t ret_value = FAIL; /* Return value */
FUNC_ENTER_NOAPI(H5C_epoch_marker_dest, FAIL)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.")
done:
FUNC_LEAVE_NOAPI(ret_value)
}
static herr_t
H5C_epoch_marker_clear(H5F_t UNUSED * f,
void UNUSED * thing,
hbool_t UNUSED dest)
{
herr_t ret_value = FAIL; /* Return value */
FUNC_ENTER_NOAPI(H5C_epoch_marker_clear, FAIL)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.")
done:
FUNC_LEAVE_NOAPI(ret_value)
}
static herr_t
H5C_epoch_marker_notify(H5C_notify_action_t UNUSED action,
void UNUSED * thing)
{
herr_t ret_value = FAIL; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5C_epoch_marker_notify)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.")
done:
FUNC_LEAVE_NOAPI(ret_value)
}
static herr_t
H5C_epoch_marker_size(const H5F_t UNUSED * f,
const void UNUSED * thing,
size_t UNUSED * size_ptr)
{
herr_t ret_value = FAIL; /* Return value */
FUNC_ENTER_NOAPI(H5C_epoch_marker_size, FAIL)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "called unreachable fcn.")
done:
FUNC_LEAVE_NOAPI(ret_value)
}
/*-------------------------------------------------------------------------
* Function: H5C_create
*
* Purpose: Allocate, initialize, and return the address of a new
* instance of H5C_t.
*
* In general, the max_cache_size parameter must be positive,
* and the min_clean_size parameter must lie in the closed
* interval [0, max_cache_size].
*
* The check_write_permitted parameter must either be NULL,
* or point to a function of type H5C_write_permitted_func_t.
* If it is NULL, the cache will use the write_permitted
* flag to determine whether writes are permitted.
*
* Return: Success: Pointer to the new instance.
*
* Failure: NULL
*
* Programmer: John Mainzer
* 6/2/04
*
* Modifications:
*
* JRM -- 7/20/04
* Updated for the addition of the hash table.
*
* JRM -- 10/5/04
* Added call to H5C_reset_cache_hit_rate_stats(). Also
* added initialization for cache_is_full flag and for
* resize_ctl.
*
* JRM -- 11/12/04
* Added initialization for the new size_decreased field.
*
* JRM -- 11/17/04
* Added/updated initialization for the automatic cache
* size control data structures.
*
* JRM -- 6/24/05
* Added support for the new write_permitted field of
* the H5C_t structure.
*
* JRM -- 7/5/05
* Added the new log_flush parameter and supporting code.
*
* JRM -- 9/21/05
* Added the new aux_ptr parameter and supporting code.
*
* JRM -- 1/20/06
* Added initialization of the new prefix field in H5C_t.
*
* JRM -- 3/16/06
* Added initialization for the pinned entry related fields.
*
* JRM -- 5/31/06
* Added initialization for the trace_file_ptr field.
*
* JRM -- 8/19/06
* Added initialization for the flush_in_progress field.
*
* JRM -- 8/25/06
* Added initialization for the slist_len_increase and
* slist_size_increase fields. These fields are used
* for sanity checking in the flush process, and are not
* compiled in unless H5C_DO_SANITY_CHECKS is TRUE.
*
* JRM -- 3/28/07
* Added initialization for the new is_read_only and
* ro_ref_count fields.
*
* JRM -- 7/27/07
* Added initialization for the new evictions_enabled
* field of H5C_t.
*
* JRM -- 12/31/07
* Added initialization for the new flash cache size increase
* related fields of H5C_t.
*
* JRM -- 11/5/08
* Added initialization for the new clean_index_size and
* dirty_index_size fields of H5C_t.
*
*-------------------------------------------------------------------------
*/
H5C_t *
H5C_create(size_t max_cache_size,
size_t min_clean_size,
int max_type_id,
const char * (* type_name_table_ptr),
H5C_write_permitted_func_t check_write_permitted,
hbool_t write_permitted,
H5C_log_flush_func_t log_flush,
void * aux_ptr)
{
int i;
H5C_t * cache_ptr = NULL;
H5C_t * ret_value = NULL; /* Return value */
FUNC_ENTER_NOAPI(H5C_create, NULL)
HDassert( max_cache_size >= H5C__MIN_MAX_CACHE_SIZE );
HDassert( max_cache_size <= H5C__MAX_MAX_CACHE_SIZE );
HDassert( min_clean_size <= max_cache_size );
HDassert( max_type_id >= 0 );
HDassert( max_type_id < H5C__MAX_NUM_TYPE_IDS );
HDassert( type_name_table_ptr );
HDassert( ( write_permitted == TRUE ) || ( write_permitted == FALSE ) );
for ( i = 0; i <= max_type_id; i++ ) {
HDassert( (type_name_table_ptr)[i] );
HDassert( HDstrlen(( type_name_table_ptr)[i]) > 0 );
}
if ( NULL == (cache_ptr = H5FL_CALLOC(H5C_t)) ) {
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, \
"memory allocation failed")
}
if ( (cache_ptr->slist_ptr = H5SL_create(H5SL_TYPE_HADDR)) == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTCREATE, NULL, "can't create skip list.")
}
/* If we get this far, we should succeed. Go ahead and initialize all
* the fields.
*/
cache_ptr->magic = H5C__H5C_T_MAGIC;
cache_ptr->flush_in_progress = FALSE;
cache_ptr->trace_file_ptr = NULL;
cache_ptr->aux_ptr = aux_ptr;
cache_ptr->max_type_id = max_type_id;
cache_ptr->type_name_table_ptr = type_name_table_ptr;
cache_ptr->max_cache_size = max_cache_size;
cache_ptr->min_clean_size = min_clean_size;
cache_ptr->check_write_permitted = check_write_permitted;
cache_ptr->write_permitted = write_permitted;
cache_ptr->log_flush = log_flush;
cache_ptr->evictions_enabled = TRUE;
cache_ptr->index_len = 0;
cache_ptr->index_size = (size_t)0;
cache_ptr->clean_index_size = (size_t)0;
cache_ptr->dirty_index_size = (size_t)0;
cache_ptr->slist_len = 0;
cache_ptr->slist_size = (size_t)0;
#if H5C_DO_SANITY_CHECKS
cache_ptr->slist_len_increase = 0;
cache_ptr->slist_size_increase = 0;
#endif /* H5C_DO_SANITY_CHECKS */
for ( i = 0; i < H5C__HASH_TABLE_LEN; i++ )
{
(cache_ptr->index)[i] = NULL;
}
cache_ptr->pl_len = 0;
cache_ptr->pl_size = (size_t)0;
cache_ptr->pl_head_ptr = NULL;
cache_ptr->pl_tail_ptr = NULL;
cache_ptr->pel_len = 0;
cache_ptr->pel_size = (size_t)0;
cache_ptr->pel_head_ptr = NULL;
cache_ptr->pel_tail_ptr = NULL;
cache_ptr->LRU_list_len = 0;
cache_ptr->LRU_list_size = (size_t)0;
cache_ptr->LRU_head_ptr = NULL;
cache_ptr->LRU_tail_ptr = NULL;
cache_ptr->cLRU_list_len = 0;
cache_ptr->cLRU_list_size = (size_t)0;
cache_ptr->cLRU_head_ptr = NULL;
cache_ptr->cLRU_tail_ptr = NULL;
cache_ptr->dLRU_list_len = 0;
cache_ptr->dLRU_list_size = (size_t)0;
cache_ptr->dLRU_head_ptr = NULL;
cache_ptr->dLRU_tail_ptr = NULL;
cache_ptr->size_increase_possible = FALSE;
cache_ptr->flash_size_increase_possible = FALSE;
cache_ptr->flash_size_increase_threshold = 0;
cache_ptr->size_decrease_possible = FALSE;
cache_ptr->resize_enabled = FALSE;
cache_ptr->cache_full = FALSE;
cache_ptr->size_decreased = FALSE;
(cache_ptr->resize_ctl).version = H5C__CURR_AUTO_SIZE_CTL_VER;
(cache_ptr->resize_ctl).rpt_fcn = NULL;
(cache_ptr->resize_ctl).set_initial_size = FALSE;
(cache_ptr->resize_ctl).initial_size = H5C__DEF_AR_INIT_SIZE;
(cache_ptr->resize_ctl).min_clean_fraction = H5C__DEF_AR_MIN_CLEAN_FRAC;
(cache_ptr->resize_ctl).max_size = H5C__DEF_AR_MAX_SIZE;
(cache_ptr->resize_ctl).min_size = H5C__DEF_AR_MIN_SIZE;
(cache_ptr->resize_ctl).epoch_length = H5C__DEF_AR_EPOCH_LENGTH;
(cache_ptr->resize_ctl).incr_mode = H5C_incr__off;
(cache_ptr->resize_ctl).lower_hr_threshold = H5C__DEF_AR_LOWER_THRESHHOLD;
(cache_ptr->resize_ctl).increment = H5C__DEF_AR_INCREMENT;
(cache_ptr->resize_ctl).apply_max_increment = TRUE;
(cache_ptr->resize_ctl).max_increment = H5C__DEF_AR_MAX_INCREMENT;
(cache_ptr->resize_ctl).flash_incr_mode = H5C_flash_incr__off;
(cache_ptr->resize_ctl).flash_multiple = 1.0;
(cache_ptr->resize_ctl).flash_threshold = 0.25;
(cache_ptr->resize_ctl).decr_mode = H5C_decr__off;
(cache_ptr->resize_ctl).upper_hr_threshold = H5C__DEF_AR_UPPER_THRESHHOLD;
(cache_ptr->resize_ctl).decrement = H5C__DEF_AR_DECREMENT;
(cache_ptr->resize_ctl).apply_max_decrement = TRUE;
(cache_ptr->resize_ctl).max_decrement = H5C__DEF_AR_MAX_DECREMENT;
(cache_ptr->resize_ctl).epochs_before_eviction = H5C__DEF_AR_EPCHS_B4_EVICT;
(cache_ptr->resize_ctl).apply_empty_reserve = TRUE;
(cache_ptr->resize_ctl).empty_reserve = H5C__DEF_AR_EMPTY_RESERVE;
cache_ptr->epoch_markers_active = 0;
/* no need to initialize the ring buffer itself */
cache_ptr->epoch_marker_ringbuf_first = 1;
cache_ptr->epoch_marker_ringbuf_last = 0;
cache_ptr->epoch_marker_ringbuf_size = 0;
for ( i = 0; i < H5C__MAX_EPOCH_MARKERS; i++ )
{
(cache_ptr->epoch_marker_active)[i] = FALSE;
#ifndef NDEBUG
((cache_ptr->epoch_markers)[i]).magic =
H5C__H5C_CACHE_ENTRY_T_MAGIC;
#endif /* NDEBUG */
((cache_ptr->epoch_markers)[i]).addr = (haddr_t)i;
((cache_ptr->epoch_markers)[i]).size = (size_t)0;
((cache_ptr->epoch_markers)[i]).type = &epoch_marker_class;
((cache_ptr->epoch_markers)[i]).is_dirty = FALSE;
((cache_ptr->epoch_markers)[i]).dirtied = FALSE;
((cache_ptr->epoch_markers)[i]).is_protected = FALSE;
((cache_ptr->epoch_markers)[i]).is_read_only = FALSE;
((cache_ptr->epoch_markers)[i]).ro_ref_count = 0;
((cache_ptr->epoch_markers)[i]).is_pinned = FALSE;
((cache_ptr->epoch_markers)[i]).in_slist = FALSE;
((cache_ptr->epoch_markers)[i]).ht_next = NULL;
((cache_ptr->epoch_markers)[i]).ht_prev = NULL;
((cache_ptr->epoch_markers)[i]).next = NULL;
((cache_ptr->epoch_markers)[i]).prev = NULL;
((cache_ptr->epoch_markers)[i]).aux_next = NULL;
((cache_ptr->epoch_markers)[i]).aux_prev = NULL;
#if H5C_COLLECT_CACHE_ENTRY_STATS
((cache_ptr->epoch_markers)[i]).accesses = 0;
((cache_ptr->epoch_markers)[i]).clears = 0;
((cache_ptr->epoch_markers)[i]).flushes = 0;
((cache_ptr->epoch_markers)[i]).pins = 0;
#endif /* H5C_COLLECT_CACHE_ENTRY_STATS */
}
if ( H5C_reset_cache_hit_rate_stats(cache_ptr) != SUCCEED ) {
/* this should be impossible... */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, \
"H5C_reset_cache_hit_rate_stats failed.")
}
H5C_stats__reset(cache_ptr);
cache_ptr->skip_file_checks = FALSE;
cache_ptr->skip_dxpl_id_checks = FALSE;
cache_ptr->prefix[0] = '\0'; /* empty string */
/* Set return value */
ret_value = cache_ptr;
done:
if ( ret_value == 0 ) {
if ( cache_ptr != NULL ) {
if ( cache_ptr->slist_ptr != NULL )
H5SL_close(cache_ptr->slist_ptr);
cache_ptr->magic = 0;
cache_ptr = H5FL_FREE(H5C_t, cache_ptr);
} /* end if */
} /* end if */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_create() */
/*-------------------------------------------------------------------------
* Function: H5C_def_auto_resize_rpt_fcn
*
* Purpose: Print results of a automatic cache resize.
*
* This function should only be used where HDprintf() behaves
* well -- i.e. not on Windows.
*
* Return: void
*
* Programmer: John Mainzer
* 10/27/04
*
* Modifications:
*
* JRM -- 11/22/04
* Reworked function to adapt it to the addition of the
* ageout method of cache size reduction.
*
* JRM -- 1/19/06
* Updated function for display the new prefix field of
* H5C_t in output.
*
* JRM 12/31/07
* Updated function to handle flash size increases.
*
*-------------------------------------------------------------------------
*/
void
H5C_def_auto_resize_rpt_fcn(H5C_t * cache_ptr,
#ifndef NDEBUG
int32_t version,
#else /* NDEBUG */
int32_t UNUSED version,
#endif /* NDEBUG */
double hit_rate,
enum H5C_resize_status status,
size_t old_max_cache_size,
size_t new_max_cache_size,
size_t old_min_clean_size,
size_t new_min_clean_size)
{
HDassert( cache_ptr != NULL );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( version == H5C__CURR_AUTO_RESIZE_RPT_FCN_VER );
switch ( status )
{
case in_spec:
HDfprintf(stdout,
"%sAuto cache resize -- no change. (hit rate = %lf)\n",
cache_ptr->prefix, hit_rate);
break;
case increase:
HDassert( hit_rate < (cache_ptr->resize_ctl).lower_hr_threshold );
HDassert( old_max_cache_size < new_max_cache_size );
HDfprintf(stdout,
"%sAuto cache resize -- hit rate (%lf) out of bounds low (%6.5lf).\n",
cache_ptr->prefix, hit_rate,
(cache_ptr->resize_ctl).lower_hr_threshold);
HDfprintf(stdout,
"%s cache size increased from (%Zu/%Zu) to (%Zu/%Zu).\n",
cache_ptr->prefix,
old_max_cache_size,
old_min_clean_size,
new_max_cache_size,
new_min_clean_size);
break;
case flash_increase:
HDassert( old_max_cache_size < new_max_cache_size );
HDfprintf(stdout,
"%sflash cache resize(%d) -- size threshold = %Zu.\n",
cache_ptr->prefix,
(int)((cache_ptr->resize_ctl).flash_incr_mode),
cache_ptr->flash_size_increase_threshold);
HDfprintf(stdout,
"%s cache size increased from (%Zu/%Zu) to (%Zu/%Zu).\n",
cache_ptr->prefix,
old_max_cache_size,
old_min_clean_size,
new_max_cache_size,
new_min_clean_size);
break;
case decrease:
HDassert( old_max_cache_size > new_max_cache_size );
switch ( (cache_ptr->resize_ctl).decr_mode )
{
case H5C_decr__off:
HDfprintf(stdout,
"%sAuto cache resize -- decrease off. HR = %lf\n",
cache_ptr->prefix, hit_rate);
break;
case H5C_decr__threshold:
HDassert( hit_rate >
(cache_ptr->resize_ctl).upper_hr_threshold );
HDfprintf(stdout,
"%sAuto cache resize -- decrease by threshold. HR = %lf > %6.5lf\n",
cache_ptr->prefix, hit_rate,
(cache_ptr->resize_ctl).upper_hr_threshold);
HDfprintf(stdout, "%sout of bounds high (%6.5lf).\n",
cache_ptr->prefix,
(cache_ptr->resize_ctl).upper_hr_threshold);
break;
case H5C_decr__age_out:
HDfprintf(stdout,
"%sAuto cache resize -- decrease by ageout. HR = %lf\n",
cache_ptr->prefix, hit_rate);
break;
case H5C_decr__age_out_with_threshold:
HDassert( hit_rate >
(cache_ptr->resize_ctl).upper_hr_threshold );
HDfprintf(stdout,
"%sAuto cache resize -- decrease by ageout with threshold. HR = %lf > %6.5lf\n",
cache_ptr->prefix, hit_rate,
(cache_ptr->resize_ctl).upper_hr_threshold);
break;
default:
HDfprintf(stdout,
"%sAuto cache resize -- decrease by unknown mode. HR = %lf\n",
cache_ptr->prefix, hit_rate);
}
HDfprintf(stdout,
"%s cache size decreased from (%Zu/%Zu) to (%Zu/%Zu).\n",
cache_ptr->prefix,
old_max_cache_size,
old_min_clean_size,
new_max_cache_size,
new_min_clean_size);
break;
case at_max_size:
HDfprintf(stdout,
"%sAuto cache resize -- hit rate (%lf) out of bounds low (%6.5lf).\n",
cache_ptr->prefix, hit_rate,
(cache_ptr->resize_ctl).lower_hr_threshold);
HDfprintf(stdout,
"%s cache already at maximum size so no change.\n",
cache_ptr->prefix);
break;
case at_min_size:
HDfprintf(stdout,
"%sAuto cache resize -- hit rate (%lf) -- can't decrease.\n",
cache_ptr->prefix, hit_rate);
HDfprintf(stdout, "%s cache already at minimum size.\n",
cache_ptr->prefix);
break;
case increase_disabled:
HDfprintf(stdout,
"%sAuto cache resize -- increase disabled -- HR = %lf.",
cache_ptr->prefix, hit_rate);
break;
case decrease_disabled:
HDfprintf(stdout,
"%sAuto cache resize -- decrease disabled -- HR = %lf.\n",
cache_ptr->prefix, hit_rate);
break;
case not_full:
HDassert( hit_rate < (cache_ptr->resize_ctl).lower_hr_threshold );
HDfprintf(stdout,
"%sAuto cache resize -- hit rate (%lf) out of bounds low (%6.5lf).\n",
cache_ptr->prefix, hit_rate,
(cache_ptr->resize_ctl).lower_hr_threshold);
HDfprintf(stdout,
"%s cache not full so no increase in size.\n",
cache_ptr->prefix);
break;
default:
HDfprintf(stdout, "%sAuto cache resize -- unknown status code.\n",
cache_ptr->prefix);
break;
}
return;
} /* H5C_def_auto_resize_rpt_fcn() */
/*-------------------------------------------------------------------------
* Function: H5C_dest
*
* Purpose: Flush all data to disk and destroy the cache.
*
* This function fails if any object are protected since the
* resulting file might not be consistent.
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used on the first write occasioned
* by the destroy (primary_dxpl_id), and on all subsequent
* writes (secondary_dxpl_id). This is useful in the metadata
* cache, but may not be needed elsewhere. If so, just use the
* same dxpl_id for both parameters.
*
* Note that *cache_ptr has been freed upon successful return.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 6/2/04
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_dest(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id)
{
H5C_t * cache_ptr = f->shared->cache;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_dest, FAIL)
/* Sanity check */
HDassert(cache_ptr);
HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
HDassert(cache_ptr->skip_file_checks || f);
/* Flush and invalidate all cache entries */
if(H5C_flush_invalidate_cache(f, primary_dxpl_id, secondary_dxpl_id,
H5C__NO_FLAGS_SET) < 0 )
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush cache")
if(cache_ptr->slist_ptr != NULL) {
H5SL_close(cache_ptr->slist_ptr);
cache_ptr->slist_ptr = NULL;
} /* end if */
cache_ptr->magic = 0;
cache_ptr = H5FL_FREE(H5C_t, cache_ptr);
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_dest() */
/*-------------------------------------------------------------------------
*
* Function: H5C_expunge_entry
*
* Purpose: Use this function to tell the cache to expunge an entry
* from the cache without writing it to disk even if it is
* dirty. The entry may not be either pinned or protected.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 6/29/06
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_expunge_entry(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
const H5C_class_t * type,
haddr_t addr,
unsigned flags)
{
H5C_t * cache_ptr;
herr_t result;
hbool_t first_flush = TRUE;
H5C_cache_entry_t * entry_ptr = NULL;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_expunge_entry, FAIL)
HDassert( f );
HDassert( f->shared );
cache_ptr = f->shared->cache;
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( type );
HDassert( type->clear );
HDassert( type->dest );
HDassert( H5F_addr_defined(addr) );
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL)
if ( ( entry_ptr == NULL ) || ( entry_ptr->type != type ) ) {
/* the target doesn't exist in the cache, so we are done. */
HGOTO_DONE(SUCCEED)
}
HDassert( entry_ptr->addr == addr );
HDassert( entry_ptr->type == type );
if ( entry_ptr->is_protected ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, \
"Target entry is protected.")
}
if ( entry_ptr->is_pinned ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, \
"Target entry is pinned.")
}
/* Pass along 'free file space' flag to cache client */
entry_ptr->free_file_space_on_destroy = ( (flags & H5C__FREE_FILE_SPACE_FLAG) != 0 );
/* If we get this far, call H5C_flush_single_entry() with the
* H5C__FLUSH_INVALIDATE_FLAG and the H5C__FLUSH_CLEAR_ONLY_FLAG.
* This will clear the entry, and then delete it from the cache.
*/
result = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
entry_ptr->addr,
H5C__FLUSH_INVALIDATE_FLAG | H5C__FLUSH_CLEAR_ONLY_FLAG,
&first_flush,
TRUE);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, \
"H5C_flush_single_entry() failed.")
}
done:
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_expunge_entry() */
/*-------------------------------------------------------------------------
* Function: H5C_flush_cache
*
* Purpose: Flush (and possibly destroy) the entries contained in the
* specified cache.
*
* If the cache contains protected entries, the function will
* fail, as protected entries cannot be flushed. However
* all unprotected entries should be flushed before the
* function returns failure.
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used on the first write occasioned
* by the flush (primary_dxpl_id), and on all subsequent
* writes (secondary_dxpl_id). This is useful in the metadata
* cache, but may not be needed elsewhere. If so, just use the
* same dxpl_id for both parameters.
*
* Return: Non-negative on success/Negative on failure or if there was
* a request to flush all items and something was protected.
*
* Programmer: John Mainzer
* 6/2/04
*
* Modifications:
*
* JRM -- 7/20/04
* Modified the function for the addition of the hash table.
*
* JRM -- 11/22/04
* Added code to remove all epoch markers (if any) from the
* LRU list before a destroy. Strictly speaking, this isn't
* necessary, as the marker entries reside only in the LRU
* list, never in the index or in the tree. However, it
* never hurts to tidy up.
*
* JRM -- 1/6/05
* Reworked code to support the new
* H5C__FLUSH_MARKED_ENTRIES_FLAG, and for the replacement of
* H5F_FLUSH_INVALIDATE flag with H5C__FLUSH_INVALIDATE_FLAG.
*
* Note that the H5C__FLUSH_INVALIDATE_FLAG takes precidence
* over the H5C__FLUSH_MARKED_ENTRIES_FLAG. Thus if both are
* set, the functions behaves as if just the
* H5C__FLUSH_INVALIDATE_FLAG was set.
*
* The H5C__FLUSH_CLEAR_ONLY_FLAG flag can co-exist with
* either the H5C__FLUSH_MARKED_ENTRIES_FLAG, or the
* H5C__FLUSH_INVALIDATE_FLAG. In all cases, it is simply
* passed along to H5C_flush_single_entry(). In the case of
* H5C__FLUSH_MARKED_ENTRIES_FLAG, it will only apply to
* the marked entries.
*
* JRM -- 10/15/05
* Added code supporting the new
* H5C__FLUSH_IGNORE_PROTECTED_FLAG. We need this flag, as
* we now use this function to flush large number of entries
* in increasing address order. We do this by marking the
* entries to be flushed, calling this function to flush them,
* and then restoring LRU order.
*
* However, it is possible that the cache will contain other,
* unmarked protected entries, when we make this call. This
* new flag allows us to ignore them.
*
* Note that even with this flag set, it is still an error
* to try to flush a protected entry.
*
* JRM -- 3/25/06
* Updated function to handle pinned entries.
*
* JRM -- 8/19/06
* Added code managing the new flush_in_progress field of
* H5C_t.
*
* Also reworked function to allow for the possibility that
* entries will be dirtied, resized, or moved during flush
* callbacks. As a result, we may have to make multiple
* passes through the skip list before the cache is flushed.
*
* JRM -- 10/13/07
* Added code to detect and manage the case in which a
* flush callback changes the s-list out from under
* the function. The only way I can think of in which this
* can happen is if a flush function loads an entry
* into the cache that isn't there already. Quincey tells
* me that this will never happen, but I'm not sure I
* believe him.
*
* Note that this is a pretty bad scenario if it ever
* happens. The code I have added should allow us to
* handle the situation under all but the worst conditions,
* but one can argue that I should just scream and die if I
* ever detect the condidtion.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_flush_cache(H5F_t *f, hid_t primary_dxpl_id, hid_t secondary_dxpl_id, unsigned flags)
{
H5C_t * cache_ptr = f->shared->cache;
herr_t status;
herr_t ret_value = SUCCEED;
hbool_t destroy;
hbool_t flushed_entries_last_pass;
hbool_t flush_marked_entries;
hbool_t first_flush = TRUE;
hbool_t ignore_protected;
hbool_t tried_to_flush_protected_entry = FALSE;
int32_t passes = 0;
int32_t protected_entries = 0;
H5SL_node_t * node_ptr = NULL;
H5C_cache_entry_t * entry_ptr = NULL;
H5C_cache_entry_t * next_entry_ptr = NULL;
#if H5C_DO_SANITY_CHECKS
int64_t flushed_entries_count;
size_t flushed_entries_size;
int64_t initial_slist_len;
size_t initial_slist_size;
#endif /* H5C_DO_SANITY_CHECKS */
FUNC_ENTER_NOAPI(H5C_flush_cache, FAIL)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f);
HDassert( cache_ptr->slist_ptr );
ignore_protected = ( (flags & H5C__FLUSH_IGNORE_PROTECTED_FLAG) != 0 );
destroy = ( (flags & H5C__FLUSH_INVALIDATE_FLAG) != 0 );
/* note that flush_marked_entries is set to FALSE if destroy is TRUE */
flush_marked_entries = ( ( (flags & H5C__FLUSH_MARKED_ENTRIES_FLAG) != 0 )
&&
( ! destroy )
);
HDassert( ! ( destroy && ignore_protected ) );
HDassert( ! ( cache_ptr->flush_in_progress ) );
cache_ptr->flush_in_progress = TRUE;
if ( destroy ) {
status = H5C_flush_invalidate_cache(f,
primary_dxpl_id,
secondary_dxpl_id,
flags);
if ( status < 0 ) {
/* This shouldn't happen -- if it does, we are toast so
* just scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"flush invalidate failed.")
}
} else {
/* When we are only flushing marked entries, the slist will usually
* still contain entries when we have flushed everything we should.
* Thus we track whether we have flushed any entries in the last
* pass, and terminate if we haven't.
*/
flushed_entries_last_pass = TRUE;
while ( ( passes < H5C__MAX_PASSES_ON_FLUSH ) &&
( cache_ptr->slist_len != 0 ) &&
( protected_entries == 0 ) &&
( flushed_entries_last_pass ) )
{
flushed_entries_last_pass = FALSE;
node_ptr = H5SL_first(cache_ptr->slist_ptr);
if ( node_ptr != NULL ) {
next_entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr);
if ( next_entry_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"next_entry_ptr == NULL 1 ?!?!");
}
#ifndef NDEBUG
HDassert( next_entry_ptr->magic ==
H5C__H5C_CACHE_ENTRY_T_MAGIC );
#endif /* NDEBUG */
HDassert( next_entry_ptr->is_dirty );
HDassert( next_entry_ptr->in_slist );
} else {
next_entry_ptr = NULL;
}
HDassert( node_ptr != NULL );
#if H5C_DO_SANITY_CHECKS
/* For sanity checking, try to verify that the skip list has
* the expected size and number of entries at the end of each
* internal while loop (see below).
*
* Doing this get a bit tricky, as depending on flags, we may
* or may not flush all the entries in the slist.
*
* To make things more entertaining, with the advent of the
* fractal heap, the entry flush callback can cause entries
* to be dirtied, resized, and/or moved.
*
* To deal with this, we first make note of the initial
* skip list length and size:
*/
initial_slist_len = cache_ptr->slist_len;
initial_slist_size = cache_ptr->slist_size;
/* We then zero counters that we use to track the number
* and total size of entries flushed:
*/
flushed_entries_count = 0;
flushed_entries_size = 0;
/* As mentioned above, there is the possibility that
* entries will be dirtied, resized, and/or flushed during
* our pass through the skip list. To capture the number
* of entries added, and the skip list size delta,
* zero the slist_len_increase and slist_size_increase of
* the cache's instance of H5C_t. These fields will be
* updated elsewhere to account for slist insertions and/or
* dirty entry size changes.
*/
cache_ptr->slist_len_increase = 0;
cache_ptr->slist_size_increase = 0;
/* at the end of the loop, use these values to compute the
* expected slist length and size and compare this with the
* value recorded in the cache's instance of H5C_t.
*/
#endif /* H5C_DO_SANITY_CHECKS */
while ( node_ptr != NULL )
{
entry_ptr = next_entry_ptr;
/* With the advent of the fractal heap, it is possible
* that the flush callback will dirty and/or resize
* other entries in the cache. In particular, while
* Quincey has promised me that this will never happen,
* it is possible that the flush callback for an
* entry may protect an entry that is not in the cache,
* perhaps causing the cache to flush and possibly
* evict the entry associated with node_ptr to make
* space for the new entry.
*
* Thus we do a bit of extra sanity checking on entry_ptr,
* and break out of this scan of the skip list if we
* detect minor problems. We have a bit of leaway on the
* number of passes though the skip list, so this shouldn't
* be an issue in the flush in and of itself, as it should
* be all but impossible for this to happen more than once
* in any flush.
*
* Observe that that breaking out of the scan early
* shouldn't break the sanity checks just after the end
* of this while loop.
*
* If an entry has merely been marked clean and removed from
* the s-list, we simply break out of the scan.
*
* If the entry has been evicted, we flag an error and
* exit.
*/
#ifndef NDEBUG
if ( entry_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"entry_ptr->magic invalid ?!?!");
} else
#endif /* NDEBUG */
if ( ( ! entry_ptr->is_dirty ) ||
( ! entry_ptr->in_slist ) ) {
/* the s-list has been modified out from under us.
* set node_ptr to NULL and break out of the loop.
*/
node_ptr = NULL;
break;
}
/* increment node pointer now, before we delete its target
* from the slist.
*/
node_ptr = H5SL_next(node_ptr);
if ( node_ptr != NULL ) {
next_entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr);
if ( next_entry_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"next_entry_ptr == NULL 2 ?!?!");
}
#ifndef NDEBUG
HDassert( next_entry_ptr->magic ==
H5C__H5C_CACHE_ENTRY_T_MAGIC );
#endif /* NDEBUG */
HDassert( next_entry_ptr->is_dirty );
HDassert( next_entry_ptr->in_slist );
} else {
next_entry_ptr = NULL;
}
HDassert( entry_ptr != NULL );
HDassert( entry_ptr->in_slist );
if ( ( ! flush_marked_entries ) ||
( entry_ptr->flush_marker ) ) {
if ( entry_ptr->is_protected ) {
/* we probably have major problems -- but lets flush
* everything we can before we decide whether to flag
* an error.
*/
tried_to_flush_protected_entry = TRUE;
protected_entries++;
} else if ( entry_ptr->is_pinned ) {
/* Test to see if we are can flush the entry now.
* If we can, go ahead and flush. Note that we
* aren't trying to do a destroy here, so that
* is not an issue.
*/
if ( TRUE ) { /* When we get to multithreaded cache,
* we will need either locking code,
* and/or a test to see if the entry
* is in flushable condition here.
*/
#if H5C_DO_SANITY_CHECKS
flushed_entries_count++;
flushed_entries_size += entry_ptr->size;
#endif /* H5C_DO_SANITY_CHECKS */
status = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
NULL,
entry_ptr->addr,
flags,
&first_flush,
FALSE);
if ( status < 0 ) {
/* This shouldn't happen -- if it does, we are
* toast so just scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"dirty pinned entry flush failed.")
}
flushed_entries_last_pass = TRUE;
}
} else {
#if H5C_DO_SANITY_CHECKS
flushed_entries_count++;
flushed_entries_size += entry_ptr->size;
#endif /* H5C_DO_SANITY_CHECKS */
status = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
NULL,
entry_ptr->addr,
flags,
&first_flush,
FALSE);
if ( status < 0 ) {
/* This shouldn't happen -- if it does, we are
* toast so just scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"Can't flush entry.")
}
flushed_entries_last_pass = TRUE;
}
}
} /* while ( node_ptr != NULL ) */
#if H5C_DO_SANITY_CHECKS
/* Verify that the slist size and length are as expected. */
HDassert( (initial_slist_len + cache_ptr->slist_len_increase -
flushed_entries_count) == cache_ptr->slist_len );
HDassert( (initial_slist_size + cache_ptr->slist_size_increase -
flushed_entries_size) == cache_ptr->slist_size );
#endif /* H5C_DO_SANITY_CHECKS */
passes++;
} /* while */
HDassert( protected_entries <= cache_ptr->pl_len );
if ( ( ( cache_ptr->pl_len > 0 ) && ( !ignore_protected ) )
||
( tried_to_flush_protected_entry ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"cache has protected items")
}
if ( ( cache_ptr->slist_len != 0 ) &&
( passes >= H5C__MAX_PASSES_ON_FLUSH ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"flush pass limit exceeded.")
}
#if H5C_DO_SANITY_CHECKS
if ( ! flush_marked_entries ) {
HDassert( cache_ptr->slist_len == 0 );
HDassert( cache_ptr->slist_size == 0 );
}
#endif /* H5C_DO_SANITY_CHECKS */
}
done:
cache_ptr->flush_in_progress = FALSE;
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_flush_cache() */
/*-------------------------------------------------------------------------
* Function: H5C_flush_to_min_clean
*
* Purpose: Flush dirty entries until the caches min clean size is
* attained.
*
* This function is used in the implementation of the
* metadata cache in PHDF5. To avoid "messages from the
* future", the cache on process 0 can't be allowed to
* flush entries until the other processes have reached
* the same point in the calculation. If this constraint
* is not met, it is possible that the other processes will
* read metadata generated at a future point in the
* computation.
*
*
* Return: Non-negative on success/Negative on failure or if
* write is not permitted.
*
* Programmer: John Mainzer
* 9/16/05
*
* Modifications:
*
* Re-wrote function to flush dirty entries in increasing
* address order, while maintaining LRU order in the LRU list
* upon return.
*
* Do this by scanning up the dirty LRU list for entries to
* flush to reach min clean size, setting their flush_marker
* flags, and recording their addresses in the order
* encountered.
*
* Then call H5C_flush_cache() to flush the marked entries.
*
* Finally, use the list of marked entries to force the
* correct LRU list order after the flush.
*
* JRM - 10/13/05
*
* This change had the oposite of the desired effect. Lets
* leave it in (albeit commented out for now). If we can't
* find a case where it helps, lets get rid of it.
*
*
* Added some sanity checks to the change which verify the
* expected values of the new is_read_only and ro_ref_count
* fields.
* JRM - 3/29/07
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_flush_to_min_clean(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id)
{
H5C_t * cache_ptr;
herr_t result;
hbool_t first_flush = TRUE;
hbool_t write_permitted;
#if 0 /* modified code -- commented out for now */
int i;
int flushed_entries_count = 0;
size_t flushed_entries_size = 0;
size_t space_needed = 0;
haddr_t * flushed_entries_list = NULL;
H5C_cache_entry_t * entry_ptr = NULL;
#endif /* JRM */
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI(H5C_flush_to_min_clean, FAIL)
HDassert( f );
HDassert( f->shared );
cache_ptr = f->shared->cache;
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f );
if ( cache_ptr->check_write_permitted != NULL ) {
result = (cache_ptr->check_write_permitted)(f,
primary_dxpl_id,
&write_permitted);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Can't get write_permitted")
}
} else {
write_permitted = cache_ptr->write_permitted;
}
if ( ! write_permitted ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"cache write is not permitted!?!\n");
}
#if 1 /* original code */
result = H5C_make_space_in_cache(f,
primary_dxpl_id,
secondary_dxpl_id,
(size_t)0,
write_permitted,
&first_flush);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"H5C_make_space_in_cache failed.")
}
#else /* modified code -- commented out for now */
if ( cache_ptr->max_cache_size > cache_ptr->index_size ) {
if ( ((cache_ptr->max_cache_size - cache_ptr->index_size) +
cache_ptr->cLRU_list_size) >= cache_ptr->min_clean_size ) {
space_needed = 0;
} else {
space_needed = cache_ptr->min_clean_size -
((cache_ptr->max_cache_size - cache_ptr->index_size) +
cache_ptr->cLRU_list_size);
}
} else {
if ( cache_ptr->min_clean_size <= cache_ptr->cLRU_list_size ) {
space_needed = 0;
} else {
space_needed = cache_ptr->min_clean_size -
cache_ptr->cLRU_list_size;
}
}
if ( space_needed > 0 ) { /* we have work to do */
HDassert( cache_ptr->slist_len > 0 );
/* allocate an array to keep a list of the entries that we
* mark for flush. We need this list to touch up the LRU
* list after the flush.
*/
flushed_entries_list = (haddr_t *)H5MM_malloc(sizeof(haddr_t) *
(size_t)(cache_ptr->slist_len));
if ( flushed_entries_list == NULL ) {
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, \
"memory allocation failed for flushed entries list")
}
/* Scan the dirty LRU list from tail forward and mark sufficient
* entries to free up the necessary space. Keep a list of the
* entries marked in the order in which they are encountered.
*/
entry_ptr = cache_ptr->dLRU_tail_ptr;
while ( ( flushed_entries_size < space_needed ) &&
( flushed_entries_count < cache_ptr->slist_len ) &&
( entry_ptr != NULL ) )
{
HDassert( ! (entry_ptr->is_protected) );
HDassert( ! (entry_ptr->is_read_only) );
HDassert( entry_ptr->ro_ref_count == 0 );
HDassert( entry_ptr->is_dirty );
HDassert( entry_ptr->in_slist );
entry_ptr->flush_marker = TRUE;
flushed_entries_size += entry_ptr->size;
flushed_entries_list[flushed_entries_count] = entry_ptr->addr;
flushed_entries_count++;
entry_ptr = entry_ptr->aux_prev;
}
HDassert( flushed_entries_count <= cache_ptr->slist_len );
HDassert( flushed_entries_size >= space_needed );
/* Flush the marked entries */
result = H5C_flush_cache(f, primary_dxpl_id, secondary_dxpl_id,
H5C__FLUSH_MARKED_ENTRIES_FLAG | H5C__FLUSH_IGNORE_PROTECTED_FLAG);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5C_flush_cache failed.")
}
/* Now touch up the LRU list so as to place the flushed entries in
* the order they they would be in if we had flushed them in the
* order we encountered them in.
*/
i = 0;
while ( i < flushed_entries_count )
{
H5C__SEARCH_INDEX_NO_STATS(cache_ptr, flushed_entries_list[i], \
entry_ptr, FAIL)
/* At present, the above search must always succeed. However,
* that may change. Write the code so we need only remove the
* following assert in that event.
*/
HDassert( entry_ptr != NULL );
H5C__FAKE_RP_FOR_MOST_RECENT_ACCESS(cache_ptr, entry_ptr, FAIL)
i++;
}
} /* if ( space_needed > 0 ) */
#endif /* end modified code -- commented out for now */
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_flush_to_min_clean() */
/*-------------------------------------------------------------------------
* Function: H5C_get_cache_auto_resize_config
*
* Purpose: Copy the current configuration of the cache automatic
* re-sizing function into the instance of H5C_auto_size_ctl_t
* pointed to by config_ptr.
*
* Return: SUCCEED on success, and FAIL on failure.
*
* Programmer: John Mainzer
* 10/8/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_get_cache_auto_resize_config(const H5C_t * cache_ptr,
H5C_auto_size_ctl_t *config_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_get_cache_auto_resize_config, FAIL)
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
if ( config_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad config_ptr on entry.")
}
*config_ptr = cache_ptr->resize_ctl;
config_ptr->set_initial_size = FALSE;
config_ptr->initial_size = cache_ptr->max_cache_size;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_cache_auto_resize_config() */
/*-------------------------------------------------------------------------
* Function: H5C_get_cache_size
*
* Purpose: Return the cache maximum size, the minimum clean size, the
* current size, and the current number of entries in
* *max_size_ptr, *min_clean_size_ptr, *cur_size_ptr, and
* *cur_num_entries_ptr respectively. If any of these
* parameters are NULL, skip that value.
*
* Return: SUCCEED on success, and FAIL on failure.
*
* Programmer: John Mainzer
* 10/8/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_get_cache_size(H5C_t * cache_ptr,
size_t * max_size_ptr,
size_t * min_clean_size_ptr,
size_t * cur_size_ptr,
int32_t * cur_num_entries_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_get_cache_size, FAIL)
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
if ( max_size_ptr != NULL ) {
*max_size_ptr = cache_ptr->max_cache_size;
}
if ( min_clean_size_ptr != NULL ) {
*min_clean_size_ptr = cache_ptr->min_clean_size;
}
if ( cur_size_ptr != NULL ) {
*cur_size_ptr = cache_ptr->index_size;
}
if ( cur_num_entries_ptr != NULL ) {
*cur_num_entries_ptr = cache_ptr->index_len;
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_cache_size() */
/*-------------------------------------------------------------------------
* Function: H5C_get_cache_hit_rate
*
* Purpose: Compute and return the current cache hit rate in
* *hit_rate_ptr. If there have been no accesses since the
* last time the cache hit rate stats were reset, set
* *hit_rate_ptr to 0.0. On error, *hit_rate_ptr is
* undefined.
*
* Return: SUCCEED on success, and FAIL on failure.
*
* Programmer: John Mainzer
* 10/7/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_get_cache_hit_rate(H5C_t * cache_ptr,
double * hit_rate_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_get_cache_hit_rate, FAIL)
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
if ( hit_rate_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad hit_rate_ptr on entry.")
}
HDassert( cache_ptr->cache_hits >= 0 );
HDassert( cache_ptr->cache_accesses >= cache_ptr->cache_hits );
if ( cache_ptr->cache_accesses > 0 ) {
*hit_rate_ptr = ((double)(cache_ptr->cache_hits)) /
((double)(cache_ptr->cache_accesses));
} else {
*hit_rate_ptr = 0.0;
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_cache_hit_rate() */
/*-------------------------------------------------------------------------
*
* Function: H5C_get_entry_status
*
* Purpose: This function is used to determine whether the cache
* contains an entry with the specified base address. If
* the entry exists, it also reports some status information
* on the entry.
*
* Status information is reported in the locations pointed
* to by the size_ptr, in_cache_ptr, is_dirty_ptr, and
* is_protected_ptr. While in_cache_ptr must be defined,
* the remaining pointers may be NULL, in which case the
* associated data is not reported.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 7/1/05
*
* Modifications:
*
* JRM -- 4/26/06
* Added the is_pinned_ptr parameter and supporting code.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_get_entry_status(const H5F_t *f,
haddr_t addr,
size_t * size_ptr,
hbool_t * in_cache_ptr,
hbool_t * is_dirty_ptr,
hbool_t * is_protected_ptr,
hbool_t * is_pinned_ptr)
{
H5C_t * cache_ptr;
H5C_cache_entry_t * entry_ptr = NULL;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_get_entry_status, FAIL)
HDassert( f );
HDassert( f->shared );
cache_ptr = f->shared->cache;
HDassert( cache_ptr != NULL );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( H5F_addr_defined(addr) );
HDassert( in_cache_ptr != NULL );
/* this test duplicates two of the above asserts, but we need an
* invocation of HGOTO_ERROR to keep the compiler happy.
*/
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL)
if ( entry_ptr == NULL ) {
/* the entry doesn't exist in the cache -- report this
* and quit.
*/
*in_cache_ptr = FALSE;
} else {
*in_cache_ptr = TRUE;
if ( size_ptr != NULL ) {
*size_ptr = entry_ptr->size;
}
if ( is_dirty_ptr != NULL ) {
*is_dirty_ptr = entry_ptr->is_dirty;
}
if ( is_protected_ptr != NULL ) {
*is_protected_ptr = entry_ptr->is_protected;
}
if ( is_pinned_ptr != NULL ) {
*is_pinned_ptr = entry_ptr->is_pinned;
}
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_entry_status() */
/*-------------------------------------------------------------------------
* Function: H5C_get_evictions_enabled()
*
* Purpose: Copy the current value of cache_ptr->evictions_enabled into
* *evictions_enabled_ptr.
*
* Return: SUCCEED on success, and FAIL on failure.
*
* Programmer: John Mainzer
* 7/27/07
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_get_evictions_enabled(const H5C_t *cache_ptr,
hbool_t * evictions_enabled_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_get_evictions_enabled, FAIL)
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
if ( evictions_enabled_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Bad evictions_enabled_ptr on entry.")
}
*evictions_enabled_ptr = cache_ptr->evictions_enabled;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_evictions_enabled() */
/*-------------------------------------------------------------------------
* Function: H5C_get_trace_file_ptr
*
* Purpose: Get the trace_file_ptr field from the cache.
*
* This field will either be NULL (which indicates that trace
* file logging is turned off), or contain a pointer to the
* open file to which trace file data is to be written.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 1/20/06
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_get_trace_file_ptr(const H5C_t *cache_ptr, FILE **trace_file_ptr_ptr)
{
FUNC_ENTER_NOAPI_NOFUNC(H5C_get_trace_file_ptr)
HDassert(cache_ptr);
HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
HDassert(trace_file_ptr_ptr);
*trace_file_ptr_ptr = cache_ptr->trace_file_ptr;
FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5C_get_trace_file_ptr() */
/*-------------------------------------------------------------------------
* Function: H5C_get_trace_file_ptr_from_entry
*
* Purpose: Get the trace_file_ptr field from the cache, via an entry.
*
* This field will either be NULL (which indicates that trace
* file logging is turned off), or contain a pointer to the
* open file to which trace file data is to be written.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Quincey Koziol
* 6/9/08
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_get_trace_file_ptr_from_entry(const H5C_cache_entry_t *entry_ptr,
FILE **trace_file_ptr_ptr)
{
FUNC_ENTER_NOAPI_NOFUNC(H5C_get_trace_file_ptr_from_entry)
/* Sanity checks */
HDassert(entry_ptr);
HDassert(entry_ptr->cache_ptr);
H5C_get_trace_file_ptr(entry_ptr->cache_ptr, trace_file_ptr_ptr);
FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5C_get_trace_file_ptr_from_entry() */
/*-------------------------------------------------------------------------
* Function: H5C_insert_entry
*
* Purpose: Adds the specified thing to the cache. The thing need not
* exist on disk yet, but it must have an address and disk
* space reserved.
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used on the first write occasioned
* by the insertion (primary_dxpl_id), and on all subsequent
* writes (secondary_dxpl_id). This is useful in the
* metadata cache, but may not be needed elsewhere. If so,
* just use the same dxpl_id for both parameters.
*
* The primary_dxpl_id is the dxpl_id passed to the
* check_write_permitted function if such a function has been
* provided.
*
* Observe that this function cannot occasion a read.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 6/2/04
*
* Modifications:
*
* JRM -- 7/21/04
* Updated function for the addition of the hash table.
*
* JRM -- 10/28/04
* Added code to set the cache_full flag to TRUE when ever
* we need to make space in the cache.
*
* JRM -- 11/22/04
* Updated function for the addition of the first_flush_ptr
* parameter to H5C_make_space_in_cache().
*
* JRM -- 1/6/05
* Added the flags parameter, and code supporting
* H5C__SET_FLUSH_MARKER_FLAG. Note that this flag is
* ignored unless the new entry is dirty.
*
* JRM -- 6/6/05
* Added code to force all inserted entries to be dirty.
* This is part of a set of changes moving management of the
* is_dirty field of H5C_cache_entry_t into the H5C code.
*
* JRM -- 6/24/05
* Added support for the new write_permitted field of
* the H5C_t structure.
*
* JRM -- 3/16/06
* Added initialization for the new is_pinned field of the
* H5C_cache_entry_t structure.
*
* JRM -- 5/3/06
* Added initialization for the new dirtied field of the
* H5C_cache_entry_t structure.
*
* JRM -- 8/9/06
* Added code supporting insertion of pinned entries.
*
* JRM -- 8/21/06
* Added initialization for the new flush_in_progress and
* destroy_in_progress fields.
*
* JRM -- 3/29/07
* Added initialization for the new is_read_only and
* ro_ref_count fields.
*
* JRM -- 8/1/07
* Added code to disable evictions when the new
* evictions_enabled field is FALSE.
*
* JRM -- 12/31/07
* Added code supporting flash cache size increases.
*
* QAK -- 1/31/08
* Added initialization for the new free_file_space_on_destroy
* field.
*
* JRM -- 11/13/08
* Moved test to see if we already have an entry with the
* specified address in the cache. This was necessary as
* we used to modify some fields in the entry to be inserted
* priort to this test, which got the cache confused if the
* insertion failed because the entry was already present.
*
* Also revised the function to call H5C_make_space_in_cache()
* if the min_clean_size is not met at present, not just if
* there is insufficient space in the cache for the new
* entry.
*
* The purpose of this modification is to avoid "metadata
* blizzards" in the write only case. In such instances,
* the cache was allowed to fill with dirty metadata. When
* we finally needed to evict an entry to make space, we had
* to flush out a whole cache full of metadata -- which has
* interesting performance effects. We hope to avoid (or
* perhaps more accurately hide) this effect by maintaining
* the min_clean_size, which should force us to start flushing
* entries long before we actually have to evict something
* to make space.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_insert_entry(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
const H5C_class_t * type,
haddr_t addr,
void * thing,
unsigned int flags)
{
H5C_t * cache_ptr;
herr_t result;
herr_t ret_value = SUCCEED; /* Return value */
hbool_t first_flush = TRUE;
hbool_t insert_pinned;
hbool_t set_flush_marker;
hbool_t write_permitted = TRUE;
size_t empty_space;
H5C_cache_entry_t * entry_ptr;
H5C_cache_entry_t * test_entry_ptr;
FUNC_ENTER_NOAPI(H5C_insert_entry, FAIL)
HDassert( f );
HDassert( f->shared );
cache_ptr = f->shared->cache;
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f );
HDassert( type );
HDassert( type->flush );
HDassert( type->size );
HDassert( H5F_addr_defined(addr) );
HDassert( thing );
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_verify_not_in_index(cache_ptr, (H5C_cache_entry_t *)thing) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "thing already in index.\n");
}
#endif /* H5C_DO_SANITY_CHECKS */
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
set_flush_marker = ( (flags & H5C__SET_FLUSH_MARKER_FLAG) != 0 );
insert_pinned = ( (flags & H5C__PIN_ENTRY_FLAG) != 0 );
entry_ptr = (H5C_cache_entry_t *)thing;
/* verify that the new entry isn't already in the hash table -- scream
* and die if it is.
*/
H5C__SEARCH_INDEX(cache_ptr, addr, test_entry_ptr, FAIL)
if ( test_entry_ptr != NULL ) {
if ( test_entry_ptr == entry_ptr ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, \
"entry already in cache.")
} else {
HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, \
"duplicate entry in cache.")
}
}
#ifndef NDEBUG
entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_MAGIC;
#endif /* NDEBUG */
entry_ptr->cache_ptr = cache_ptr;
entry_ptr->addr = addr;
entry_ptr->type = type;
entry_ptr->is_protected = FALSE;
entry_ptr->is_read_only = FALSE;
entry_ptr->ro_ref_count = 0;
entry_ptr->is_pinned = insert_pinned;
/* newly inserted entries are assumed to be dirty */
entry_ptr->is_dirty = TRUE;
/* not protected, so can't be dirtied */
entry_ptr->dirtied = FALSE;
if ( (type->size)(f, thing, &(entry_ptr->size)) < 0 ) {
HGOTO_ERROR(H5E_RESOURCE, H5E_CANTGETSIZE, FAIL, \
"Can't get size of thing")
}
HDassert( entry_ptr->size < H5C_MAX_ENTRY_SIZE );
entry_ptr->in_slist = FALSE;
#ifdef H5_HAVE_PARALLEL
entry_ptr->clear_on_unprotect = FALSE;
#endif /* H5_HAVE_PARALLEL */
entry_ptr->flush_in_progress = FALSE;
entry_ptr->destroy_in_progress = FALSE;
entry_ptr->free_file_space_on_destroy = FALSE;
entry_ptr->ht_next = NULL;
entry_ptr->ht_prev = NULL;
entry_ptr->next = NULL;
entry_ptr->prev = NULL;
entry_ptr->aux_next = NULL;
entry_ptr->aux_prev = NULL;
H5C__RESET_CACHE_ENTRY_STATS(entry_ptr)
if ( ( cache_ptr->flash_size_increase_possible ) &&
( entry_ptr->size > cache_ptr->flash_size_increase_threshold ) ) {
result = H5C__flash_increase_cache_size(cache_ptr, 0, entry_ptr->size);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, \
"H5C__flash_increase_cache_size failed.")
}
}
if ( cache_ptr->index_size >= cache_ptr->max_cache_size ) {
empty_space = 0;
} else {
empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;
}
if ( ( cache_ptr->evictions_enabled )
&&
( ( (cache_ptr->index_size + entry_ptr->size) >
cache_ptr->max_cache_size
)
||
(
( ( empty_space + cache_ptr->clean_index_size ) <
cache_ptr->min_clean_size )
)
)
) {
size_t space_needed;
if ( empty_space <= entry_ptr->size ) {
cache_ptr->cache_full = TRUE;
}
if ( cache_ptr->check_write_permitted != NULL ) {
result = (cache_ptr->check_write_permitted)(f,
primary_dxpl_id,
&write_permitted);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, \
"Can't get write_permitted")
}
} else {
write_permitted = cache_ptr->write_permitted;
}
HDassert( entry_ptr->size <= H5C_MAX_ENTRY_SIZE );
space_needed = entry_ptr->size;
if ( space_needed > cache_ptr->max_cache_size ) {
space_needed = cache_ptr->max_cache_size;
}
/* Note that space_needed is just the amount of space that
* needed to insert the new entry without exceeding the cache
* size limit. The subsequent call to H5C_make_space_in_cache()
* may evict the entries required to free more or less space
* depending on conditions. It MAY be less if the cache is
* currently undersized, or more if the cache is oversized.
*
* The cache can exceed its maximum size limit via the following
* mechanisms:
*
* First, it is possible for the cache to grow without
* bound as long as entries are protected and not unprotected.
*
* Second, when writes are not permitted it is also possible
* for the cache to grow without bound.
*
* Finally, we usually don't check to see if the cache is
* oversized at the end of an unprotect. As a result, it is
* possible to have a vastly oversized cache with no protected
* entries as long as all the protects preceed the unprotects.
*
* Since items 1 and 2 are not changing any time soon, I see
* no point in worrying about the third.
*/
result = H5C_make_space_in_cache(f,
primary_dxpl_id,
secondary_dxpl_id,
space_needed,
write_permitted,
&first_flush);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, \
"H5C_make_space_in_cache failed.")
}
}
H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, FAIL)
/* New entries are presumed to be dirty, so this if statement is
* unnecessary. Rework it once the rest of the code changes are
* in and tested. -- JRM
*/
if ( entry_ptr->is_dirty ) {
entry_ptr->flush_marker = set_flush_marker;
H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL)
} else {
entry_ptr->flush_marker = FALSE;
}
H5C__UPDATE_RP_FOR_INSERTION(cache_ptr, entry_ptr, FAIL)
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
H5C__UPDATE_STATS_FOR_INSERTION(cache_ptr, entry_ptr)
done:
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_insert_entry() */
/*-------------------------------------------------------------------------
*
* Function: H5C_mark_entries_as_clean
*
* Purpose: When the H5C code is used to implement the metadata caches
* in PHDF5, only the cache with MPI_rank 0 is allowed to
* actually write entries to disk -- all other caches must
* retain dirty entries until they are advised that the
* entries are clean.
*
* This function exists to allow the H5C code to receive these
* notifications.
*
* The function receives a list of entry base addresses
* which must refer to dirty entries in the cache. If any
* of the entries are either clean or don't exist, the
* function flags an error.
*
* The function scans the list of entries and flushes all
* those that are currently unprotected with the
* H5C__FLUSH_CLEAR_ONLY_FLAG. Those that are currently
* protected are flagged for clearing when they are
* unprotected.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 7/5/05
*
* Modifications:
*
* Reworked function to flush entries in LRU order instead
* of increasing address order. The hope is that this will
* improve the hit rate on the slave caches.
*
* JRM - 10/13/05
*
* Leave the old code in place for now (commented out) for
* benchmarking.
*
* JRM -- 4/13/06
* Updated function to deal with pinned entries.
*
*-------------------------------------------------------------------------
*/
#ifdef H5_HAVE_PARALLEL
herr_t
H5C_mark_entries_as_clean(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
int32_t ce_array_len,
haddr_t * ce_array_ptr)
{
H5C_t * cache_ptr;
hbool_t first_flush = TRUE;
int entries_cleared;
int entries_examined;
int i;
int initial_list_len;
haddr_t addr;
#if H5C_DO_SANITY_CHECKS
int pinned_entries_marked = 0;
int protected_entries_marked = 0;
int other_entries_marked = 0;
haddr_t last_addr;
#endif /* H5C_DO_SANITY_CHECKS */
H5C_cache_entry_t * clear_ptr = NULL;
H5C_cache_entry_t * entry_ptr = NULL;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_mark_entries_as_clean, FAIL)
HDassert( f );
HDassert( f->shared );
cache_ptr = f->shared->cache;
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f );
HDassert( ce_array_len > 0 );
HDassert( ce_array_ptr != NULL );
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HDassert(0);
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
for ( i = 0; i < ce_array_len; i++ )
{
addr = ce_array_ptr[i];
#if H5C_DO_SANITY_CHECKS
if ( i == 0 ) {
last_addr = addr;
} else {
if ( last_addr == addr ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Duplicate entry in cleaned list.\n");
} else if ( last_addr > addr ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"cleaned list not sorted.\n");
}
}
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HDassert(0);
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
#endif /* H5C_DO_SANITY_CHECKS */
HDassert( H5F_addr_defined(addr) );
H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL)
if ( entry_ptr == NULL ) {
#if H5C_DO_SANITY_CHECKS
HDfprintf(stdout,
"H5C_mark_entries_as_clean: entry[%d] = %ld not in cache.\n",
(int)i,
(long)addr);
#endif /* H5C_DO_SANITY_CHECKS */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Listed entry not in cache?!?!?.")
} else if ( ! entry_ptr->is_dirty ) {
#if H5C_DO_SANITY_CHECKS
HDfprintf(stdout,
"H5C_mark_entries_as_clean: entry %ld is not dirty!?!\n",
(long)addr);
#endif /* H5C_DO_SANITY_CHECKS */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Listed entry not dirty?!?!?.")
#if 0 /* original code */
} else if ( entry_ptr->is_protected ) {
entry_ptr->clear_on_unprotect = TRUE;
} else {
if ( H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
addr,
H5C__FLUSH_CLEAR_ONLY_FLAG,
&first_flush,
TRUE) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.")
}
}
#else /* modified code */
} else {
/* Mark the entry to be cleared on unprotect. We will
* scan the LRU list shortly, and clear all those entries
* not currently protected.
*/
entry_ptr->clear_on_unprotect = TRUE;
#if H5C_DO_SANITY_CHECKS
if ( entry_ptr->is_protected ) {
protected_entries_marked++;
} else if ( entry_ptr->is_pinned ) {
pinned_entries_marked++;
} else {
other_entries_marked++;
}
#endif /* H5C_DO_SANITY_CHECKS */
}
#endif /* end modified code */
}
#if 1 /* modified code */
/* Scan through the LRU list from back to front, and flush the
* entries whose clear_on_unprotect flags are set. Observe that
* any protected entries will not be on the LRU, and therefore
* will not be flushed at this time.
*/
entries_cleared = 0;
entries_examined = 0;
initial_list_len = cache_ptr->LRU_list_len;
entry_ptr = cache_ptr->LRU_tail_ptr;
while ( ( entry_ptr != NULL ) &&
( entries_examined <= initial_list_len ) &&
( entries_cleared < ce_array_len ) )
{
if ( entry_ptr->clear_on_unprotect ) {
entry_ptr->clear_on_unprotect = FALSE;
clear_ptr = entry_ptr;
entry_ptr = entry_ptr->prev;
entries_cleared++;
if ( H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
clear_ptr->type,
clear_ptr->addr,
H5C__FLUSH_CLEAR_ONLY_FLAG,
&first_flush,
TRUE) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.")
}
} else {
entry_ptr = entry_ptr->prev;
}
entries_examined++;
}
#if H5C_DO_SANITY_CHECKS
HDassert( entries_cleared == other_entries_marked );
#endif /* H5C_DO_SANITY_CHECKS */
/* It is also possible that some of the cleared entries are on the
* pinned list. Must scan that also.
*/
entry_ptr = cache_ptr->pel_head_ptr;
while ( entry_ptr != NULL )
{
if ( entry_ptr->clear_on_unprotect ) {
entry_ptr->clear_on_unprotect = FALSE;
clear_ptr = entry_ptr;
entry_ptr = entry_ptr->next;
entries_cleared++;
if ( H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
clear_ptr->type,
clear_ptr->addr,
H5C__FLUSH_CLEAR_ONLY_FLAG,
&first_flush,
TRUE) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't clear entry.")
}
} else {
entry_ptr = entry_ptr->next;
}
}
#if H5C_DO_SANITY_CHECKS
HDassert( entries_cleared == pinned_entries_marked + other_entries_marked );
HDassert( entries_cleared + protected_entries_marked == ce_array_len );
#endif /* H5C_DO_SANITY_CHECKS */
HDassert( ( entries_cleared == ce_array_len ) ||
( (ce_array_len - entries_cleared) <= cache_ptr->pl_len ) );
#if H5C_DO_SANITY_CHECKS
i = 0;
entry_ptr = cache_ptr->pl_head_ptr;
while ( entry_ptr != NULL )
{
if ( entry_ptr->clear_on_unprotect ) {
i++;
}
entry_ptr = entry_ptr->next;
}
HDassert( (entries_cleared + i) == ce_array_len );
#endif /* H5C_DO_SANITY_CHECKS */
#endif /* modified code */
done:
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HDassert(0);
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_mark_entries_as_clean() */
#endif /* H5_HAVE_PARALLEL */
/*-------------------------------------------------------------------------
* Function: H5C_mark_entry_dirty
*
* Purpose: Mark a pinned or protected entry as dirty. The target entry
* MUST be either pinned or protected, and MAY be both.
*
* In the protected case, this call is the functional
* equivalent of setting the H5C__DIRTIED_FLAG on an unprotect
* call.
*
* In the pinned but not protected case, if the entry is not
* already dirty, the function places function marks the entry
* dirty and places it on the skip list.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 5/15/06
*
* JRM -- 11/5/08
* Added call to H5C__UPDATE_INDEX_FOR_ENTRY_DIRTY() to
* update the new clean_index_size and dirty_index_size
* fields of H5C_t in the case that the entry was clean
* prior to this call, and is pinned and not protected.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_mark_entry_dirty(void *thing)
{
H5C_t * cache_ptr;
H5C_cache_entry_t * entry_ptr = (H5C_cache_entry_t *)thing;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_mark_entry_dirty, FAIL)
/* Sanity checks */
HDassert(entry_ptr);
HDassert(H5F_addr_defined(entry_ptr->addr));
cache_ptr = entry_ptr->cache_ptr;
HDassert(cache_ptr);
HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
if ( entry_ptr->is_protected ) {
HDassert( ! ((entry_ptr)->is_read_only) );
/* set the dirtied flag */
entry_ptr->dirtied = TRUE;
} else if ( entry_ptr->is_pinned ) {
hbool_t was_pinned_unprotected_and_clean;
was_pinned_unprotected_and_clean = ! ( entry_ptr->is_dirty );
/* mark the entry as dirty if it isn't already */
entry_ptr->is_dirty = TRUE;
if ( was_pinned_unprotected_and_clean ) {
H5C__UPDATE_INDEX_FOR_ENTRY_DIRTY(cache_ptr, entry_ptr);
}
if ( ! (entry_ptr->in_slist) ) {
H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL)
}
H5C__UPDATE_STATS_FOR_DIRTY_PIN(cache_ptr, entry_ptr)
} else {
HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL, \
"Entry is neither pinned nor protected??")
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_mark_entry_dirty() */
/*-------------------------------------------------------------------------
*
* Function: H5C_move_entry
*
* Purpose: Use this function to notify the cache that an entry's
* file address changed.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 6/2/04
*
* JRM -- 11/5/08
* On review this function looks like no change is needed to
* support the new clean_index_size and dirty_index_size
* fields of H5C_t.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_move_entry(H5C_t * cache_ptr,
const H5C_class_t * type,
haddr_t old_addr,
haddr_t new_addr)
{
hbool_t was_dirty;
H5C_cache_entry_t * entry_ptr = NULL;
H5C_cache_entry_t * test_entry_ptr = NULL;
#if H5C_DO_SANITY_CHECKS
hbool_t removed_entry_from_slist = FALSE;
#endif /* H5C_DO_SANITY_CHECKS */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_move_entry, FAIL)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( type );
HDassert( H5F_addr_defined(old_addr) );
HDassert( H5F_addr_defined(new_addr) );
HDassert( H5F_addr_ne(old_addr, new_addr) );
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
H5C__SEARCH_INDEX(cache_ptr, old_addr, entry_ptr, FAIL)
if ( ( entry_ptr == NULL ) || ( entry_ptr->type != type ) ) {
/* the old item doesn't exist in the cache, so we are done. */
HGOTO_DONE(SUCCEED)
}
HDassert( entry_ptr->addr == old_addr );
HDassert( entry_ptr->type == type );
if ( entry_ptr->is_protected ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTMOVE, FAIL, \
"Target entry is protected.")
}
H5C__SEARCH_INDEX(cache_ptr, new_addr, test_entry_ptr, FAIL)
if ( test_entry_ptr != NULL ) { /* we are hosed */
if ( test_entry_ptr->type == type ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTMOVE, FAIL, \
"Target already moved & reinserted???.")
} else {
HGOTO_ERROR(H5E_CACHE, H5E_CANTMOVE, FAIL, \
"New address already in use?.")
}
}
/* If we get this far we have work to do. Remove *entry_ptr from
* the hash table (and skip list if necessary), change its address to the
* new address, mark it as dirty (if it isn't already) and then re-insert.
*
* Update the replacement policy for a hit to avoid an eviction before
* the moved entry is touched. Update stats for a move.
*
* Note that we do not check the size of the cache, or evict anything.
* Since this is a simple re-name, cache size should be unaffected.
*
* Check to see if the target entry is in the process of being destroyed
* before we delete from the index, etc. If it is, all we do is
* change the addr. If the entry is only in the process of being flushed,
* don't mark it as dirty either, lest we confuse the flush call back.
*/
if ( ! ( entry_ptr->destroy_in_progress ) ) {
H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr)
if ( entry_ptr->in_slist ) {
HDassert( cache_ptr->slist_ptr );
H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr)
#if H5C_DO_SANITY_CHECKS
removed_entry_from_slist = TRUE;
#endif /* H5C_DO_SANITY_CHECKS */
}
}
entry_ptr->addr = new_addr;
if ( ! ( entry_ptr->destroy_in_progress ) ) {
was_dirty = entry_ptr->is_dirty;
if ( ! ( entry_ptr->flush_in_progress ) ) {
entry_ptr->is_dirty = TRUE;
}
H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, FAIL)
if ( ! ( entry_ptr->flush_in_progress ) ) {
H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL)
#if H5C_DO_SANITY_CHECKS
if ( removed_entry_from_slist ) {
/* we just removed the entry from the slist. Thus we
* must touch up cache_ptr->slist_len_increase and
* cache_ptr->slist_size_increase to keep from skewing
* the sanity checks.
*/
HDassert( cache_ptr->slist_len_increase > 1 );
HDassert( cache_ptr->slist_size_increase > entry_ptr->size );
cache_ptr->slist_len_increase -= 1;
cache_ptr->slist_size_increase -= entry_ptr->size;
}
#endif /* H5C_DO_SANITY_CHECKS */
H5C__UPDATE_RP_FOR_MOVE(cache_ptr, entry_ptr, was_dirty, FAIL)
}
}
H5C__UPDATE_STATS_FOR_MOVE(cache_ptr, entry_ptr)
done:
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_move_entry() */
/*-------------------------------------------------------------------------
* Function: H5C_resize_entry
*
* Purpose: Resize a pinned or protected entry.
*
* Resizing an entry dirties it, so if the entry is not
* already dirty, the function places the entry on the
* skip list.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 7/5/06
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_resize_entry(void *thing, size_t new_size)
{
H5C_t * cache_ptr;
H5C_cache_entry_t * entry_ptr = (H5C_cache_entry_t *)thing;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_resize_entry, FAIL)
/* Sanity checks */
HDassert(entry_ptr);
HDassert(H5F_addr_defined(entry_ptr->addr));
cache_ptr = entry_ptr->cache_ptr;
HDassert(cache_ptr);
HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
/* Check for usage errors */
if(new_size <= 0)
HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "New size is non-positive.")
if(!(entry_ptr->is_pinned || entry_ptr->is_protected))
HGOTO_ERROR(H5E_CACHE, H5E_CANTRESIZE, FAIL, "Entry isn't pinned or protected??")
/* update for change in entry size if necessary */
if ( entry_ptr->size != new_size ) {
hbool_t was_clean;
/* make note of whether the entry was clean to begin with */
was_clean = ! ( entry_ptr->is_dirty );
/* mark the entry as dirty if it isn't already */
entry_ptr->is_dirty = TRUE;
/* do a flash cache size increase if appropriate */
if ( cache_ptr->flash_size_increase_possible ) {
if ( new_size > entry_ptr->size ) {
size_t size_increase;
size_increase = new_size - entry_ptr->size;
if(size_increase >= cache_ptr->flash_size_increase_threshold) {
if(H5C__flash_increase_cache_size(cache_ptr, entry_ptr->size, new_size) < 0)
HGOTO_ERROR(H5E_CACHE, H5E_CANTRESIZE, FAIL, "flash cache increase failed")
}
}
}
/* update the pinned and/or protected entry list */
if(entry_ptr->is_pinned) {
H5C__DLL_UPDATE_FOR_SIZE_CHANGE((cache_ptr->pel_len), \
(cache_ptr->pel_size), \
(entry_ptr->size), (new_size));
} /* end if */
if(entry_ptr->is_protected) {
H5C__DLL_UPDATE_FOR_SIZE_CHANGE((cache_ptr->pl_len), \
(cache_ptr->pl_size), \
(entry_ptr->size), (new_size));
} /* end if */
/* update the hash table */
H5C__UPDATE_INDEX_FOR_SIZE_CHANGE((cache_ptr), (entry_ptr->size),\
(new_size), (entry_ptr), (was_clean));
/* if the entry is in the skip list, update that too */
if ( entry_ptr->in_slist ) {
H5C__UPDATE_SLIST_FOR_SIZE_CHANGE((cache_ptr), (entry_ptr->size),\
(new_size));
} /* end if */
/* update statistics just before changing the entry size */
H5C__UPDATE_STATS_FOR_ENTRY_SIZE_CHANGE((cache_ptr), (entry_ptr), \
(new_size));
/* finally, update the entry size proper */
entry_ptr->size = new_size;
if(!entry_ptr->in_slist) {
H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL)
} /* end if */
if(entry_ptr->is_pinned) {
H5C__UPDATE_STATS_FOR_DIRTY_PIN(cache_ptr, entry_ptr)
} /* end if */
} /* end if */
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_resize_entry() */
/*-------------------------------------------------------------------------
* Function: H5C_pin_protected_entry()
*
* Purpose: Pin a protected cache entry. The entry must be protected
* at the time of call, and must be unpinned.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 4/26/06
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_pin_protected_entry(void *thing)
{
H5C_t * cache_ptr;
H5C_cache_entry_t * entry_ptr = (H5C_cache_entry_t *)thing; /* Pointer to entry to pin */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_pin_protected_entry, FAIL)
/* Sanity checks */
HDassert(entry_ptr);
HDassert(H5F_addr_defined(entry_ptr->addr));
cache_ptr = entry_ptr->cache_ptr;
HDassert(cache_ptr);
HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
if ( ! ( entry_ptr->is_protected ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "Entry isn't protected")
}
if ( entry_ptr->is_pinned ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "Entry is already pinned")
}
entry_ptr->is_pinned = TRUE;
H5C__UPDATE_STATS_FOR_PIN(cache_ptr, entry_ptr)
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_pin_protected_entry() */
/*-------------------------------------------------------------------------
* Function: H5C_protect
*
* Purpose: If the target entry is not in the cache, load it. If
* necessary, attempt to evict one or more entries to keep
* the cache within its maximum size.
*
* Mark the target entry as protected, and return its address
* to the caller. The caller must call H5C_unprotect() when
* finished with the entry.
*
* While it is protected, the entry may not be either evicted
* or flushed -- nor may it be accessed by another call to
* H5C_protect. Any attempt to do so will result in a failure.
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used on the first write occasioned
* by the insertion (primary_dxpl_id), and on all subsequent
* writes (secondary_dxpl_id). This is useful in the
* metadata cache, but may not be needed elsewhere. If so,
* just use the same dxpl_id for both parameters.
*
* All reads are performed with the primary_dxpl_id.
*
* Similarly, the primary_dxpl_id is passed to the
* check_write_permitted function if it is called.
*
* Return: Success: Ptr to the desired entry
*
* Failure: NULL
*
* Programmer: John Mainzer - 6/2/04
*
* Modifications:
*
* JRM -- 7/21/04
* Updated for the addition of the hash table.
*
* JRM -- 10/28/04
* Added code to set cache_full to TRUE whenever we try to
* make space in the cache.
*
* JRM -- 11/12/04
* Added code to call to H5C_make_space_in_cache()
* after the call to H5C__auto_adjust_cache_size() if that
* function sets the size_decreased flag is TRUE.
*
* JRM -- 4/25/05
* The size_decreased flag can also be set to TRUE in
* H5C_set_cache_auto_resize_config() if a new configuration
* forces an immediate reduction in cache size. Modified
* the code to deal with this eventuallity.
*
* JRM -- 6/24/05
* Added support for the new write_permitted field of H5C_t.
*
* JRM -- 10/22/05
* Hand optimizations.
*
* JRM -- 5/3/06
* Added code to set the new dirtied field in
* H5C_cache_entry_t to FALSE prior to return.
*
* JRM -- 6/23/06
* Modified code to allow dirty entries to be loaded from
* disk. This is necessary as a bug fix in the object
* header code requires us to modify a header as it is read.
*
* JRM -- 3/28/07
* Added the flags parameter and supporting code. At least
* for now, this parameter is used to allow the entry to
* be protected read only, thus allowing multiple protects.
*
* Also added code to allow multiple read only protects
* of cache entries.
*
* JRM -- 7/27/07
* Added code supporting the new evictions_enabled field
* in H5C_t.
*
* JRM -- 1/3/08
* Added to do a flash cache size increase if appropriate
* when a large entry is loaded.
*
* JRM -- 11/13/08
* Modified function to call H5C_make_space_in_cache() when
* the min_clean_size is violated, not just when there isn't
* enough space for and entry that has just been loaded.
*
* The purpose of this modification is to avoid "metadata
* blizzards" in the write only case. In such instances,
* the cache was allowed to fill with dirty metadata. When
* we finally needed to evict an entry to make space, we had
* to flush out a whole cache full of metadata -- which has
* interesting performance effects. We hope to avoid (or
* perhaps more accurately hide) this effect by maintaining
* the min_clean_size, which should force us to start flushing
* entries long before we actually have to evict something
* to make space.
*
*-------------------------------------------------------------------------
*/
void *
H5C_protect(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
const H5C_class_t * type,
haddr_t addr,
void * udata,
unsigned flags)
{
H5C_t * cache_ptr;
hbool_t hit;
hbool_t first_flush;
hbool_t have_write_permitted = FALSE;
hbool_t read_only = FALSE;
hbool_t write_permitted;
herr_t result;
size_t empty_space;
void * thing;
H5C_cache_entry_t * entry_ptr;
void * ret_value; /* Return value */
FUNC_ENTER_NOAPI(H5C_protect, NULL)
/* check args */
HDassert( f );
HDassert( f->shared );
cache_ptr = f->shared->cache;
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f );
HDassert( type );
HDassert( type->flush );
HDassert( type->load );
HDassert( H5F_addr_defined(addr) );
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HDassert(0);
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
if ( (flags & H5C__READ_ONLY_FLAG) != 0 )
{
read_only = TRUE;
}
/* first check to see if the target is in cache */
H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, NULL)
if ( entry_ptr != NULL ) {
/* Check for trying to load the wrong type of entry from an address */
if(entry_ptr->type != type)
HGOTO_ERROR(H5E_CACHE, H5E_BADTYPE, NULL, "incorrect cache entry type")
hit = TRUE;
thing = (void *)entry_ptr;
} else {
/* must try to load the entry from disk. */
hit = FALSE;
thing = H5C_load_entry(f, primary_dxpl_id, type, addr, udata, cache_ptr->skip_file_checks);
if ( thing == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "can't load entry")
}
entry_ptr = (H5C_cache_entry_t *)thing;
/* If the entry is very large, and we are configured to allow it,
* we may wish to perform a flash cache size increase.
*/
if ( ( cache_ptr->flash_size_increase_possible ) &&
( entry_ptr->size > cache_ptr->flash_size_increase_threshold ) ) {
result = H5C__flash_increase_cache_size(cache_ptr, 0,
entry_ptr->size);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \
"H5C__flash_increase_cache_size failed.")
}
}
if ( cache_ptr->index_size >= cache_ptr->max_cache_size ) {
empty_space = 0;
} else {
empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;
}
/* try to free up if necceary and if evictions are permitted. Note
* that if evictions are enabled, we will call H5C_make_space_in_cache()
* regardless if the min_free_space requirement is not met.
*/
if ( ( cache_ptr->evictions_enabled ) &&
( ( (cache_ptr->index_size + entry_ptr->size) >
cache_ptr->max_cache_size)
||
( ( empty_space + cache_ptr->clean_index_size ) <
cache_ptr->min_clean_size )
)
) {
size_t space_needed;
if ( empty_space <= entry_ptr->size ) {
cache_ptr->cache_full = TRUE;
}
if ( cache_ptr->check_write_permitted != NULL ) {
result = (cache_ptr->check_write_permitted)(f,
primary_dxpl_id,
&write_permitted);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \
"Can't get write_permitted 1")
} else {
have_write_permitted = TRUE;
first_flush = TRUE;
}
} else {
write_permitted = cache_ptr->write_permitted;
have_write_permitted = TRUE;
first_flush = TRUE;
}
HDassert( entry_ptr->size <= H5C_MAX_ENTRY_SIZE );
space_needed = entry_ptr->size;
if ( space_needed > cache_ptr->max_cache_size ) {
space_needed = cache_ptr->max_cache_size;
}
/* Note that space_needed is just the amount of space that
* needed to insert the new entry without exceeding the cache
* size limit. The subsequent call to H5C_make_space_in_cache()
* may evict the entries required to free more or less space
* depending on conditions. It MAY be less if the cache is
* currently undersized, or more if the cache is oversized.
*
* The cache can exceed its maximum size limit via the following
* mechanisms:
*
* First, it is possible for the cache to grow without
* bound as long as entries are protected and not unprotected.
*
* Second, when writes are not permitted it is also possible
* for the cache to grow without bound.
*
* Third, the user may choose to disable evictions -- causing
* the cache to grow without bound until evictions are
* re-enabled.
*
* Finally, we usually don't check to see if the cache is
* oversized at the end of an unprotect. As a result, it is
* possible to have a vastly oversized cache with no protected
* entries as long as all the protects preceed the unprotects.
*
* Since items 1, 2, and 3 are not changing any time soon, I
* see no point in worrying about the fourth.
*/
result = H5C_make_space_in_cache(f, primary_dxpl_id,
secondary_dxpl_id,
space_needed, write_permitted,
&first_flush);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \
"H5C_make_space_in_cache failed 1.")
}
}
/* Insert the entry in the hash table. It can't be dirty yet, so
* we don't even check to see if it should go in the skip list.
*
* This is no longer true -- due to a bug fix, we may modify
* data on load to repair a file.
*/
H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, NULL)
if ( ( entry_ptr->is_dirty ) && ( ! (entry_ptr->in_slist) ) ) {
H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, NULL)
}
/* insert the entry in the data structures used by the replacement
* policy. We are just going to take it out again when we update
* the replacement policy for a protect, but this simplifies the
* code. If we do this often enough, we may want to optimize this.
*/
H5C__UPDATE_RP_FOR_INSERTION(cache_ptr, entry_ptr, NULL)
}
HDassert( entry_ptr->addr == addr );
HDassert( entry_ptr->type == type );
if ( entry_ptr->is_protected ) {
if ( ( read_only ) && ( entry_ptr->is_read_only ) ) {
HDassert( entry_ptr->ro_ref_count > 0 );
(entry_ptr->ro_ref_count)++;
} else {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \
"Target already protected & not read only?!?.")
}
} else {
H5C__UPDATE_RP_FOR_PROTECT(cache_ptr, entry_ptr, NULL)
entry_ptr->is_protected = TRUE;
if ( read_only ) {
entry_ptr->is_read_only = TRUE;
entry_ptr->ro_ref_count = 1;
}
entry_ptr->dirtied = FALSE;
}
H5C__UPDATE_CACHE_HIT_RATE_STATS(cache_ptr, hit)
H5C__UPDATE_STATS_FOR_PROTECT(cache_ptr, entry_ptr, hit)
ret_value = thing;
if ( ( cache_ptr->evictions_enabled ) &&
( ( cache_ptr->size_decreased ) ||
( ( cache_ptr->resize_enabled ) &&
( cache_ptr->cache_accesses >=
(cache_ptr->resize_ctl).epoch_length ) ) ) ) {
if ( ! have_write_permitted ) {
if ( cache_ptr->check_write_permitted != NULL ) {
result = (cache_ptr->check_write_permitted)(f,
primary_dxpl_id,
&write_permitted);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \
"Can't get write_permitted 2")
} else {
have_write_permitted = TRUE;
first_flush = TRUE;
}
} else {
write_permitted = cache_ptr->write_permitted;
have_write_permitted = TRUE;
first_flush = TRUE;
}
}
if ( ( cache_ptr->resize_enabled ) &&
( cache_ptr->cache_accesses >=
(cache_ptr->resize_ctl).epoch_length ) ) {
result = H5C__auto_adjust_cache_size(f,
primary_dxpl_id,
secondary_dxpl_id,
write_permitted,
&first_flush);
if ( result != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \
"Cache auto-resize failed.")
}
}
if ( cache_ptr->size_decreased ) {
cache_ptr->size_decreased = FALSE;
/* check to see if the cache is now oversized due to the cache
* size reduction. If it is, try to evict enough entries to
* bring the cache size down to the current maximum cache size.
*
* Also, if the min_clean_size requirement is not met, we
* should also call H5C_make_space_in_cache() to bring us
* into complience.
*/
if ( cache_ptr->index_size >= cache_ptr->max_cache_size ) {
empty_space = 0;
} else {
empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;
}
if ( ( cache_ptr->index_size > cache_ptr->max_cache_size )
||
( ( empty_space + cache_ptr->clean_index_size ) <
cache_ptr->min_clean_size) ) {
if ( cache_ptr->index_size > cache_ptr->max_cache_size ) {
cache_ptr->cache_full = TRUE;
}
result = H5C_make_space_in_cache(f, primary_dxpl_id,
secondary_dxpl_id,
(size_t)0, write_permitted,
&first_flush);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, \
"H5C_make_space_in_cache failed 2.")
}
}
}
}
done:
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_protect() */
/*-------------------------------------------------------------------------
*
* Function: H5C_reset_cache_hit_rate_stats()
*
* Purpose: Reset the cache hit rate computation fields.
*
* Return: SUCCEED on success, and FAIL on failure.
*
* Programmer: John Mainzer, 10/5/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_reset_cache_hit_rate_stats(H5C_t * cache_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_reset_cache_hit_rate_stats, FAIL)
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
cache_ptr->cache_hits = 0;
cache_ptr->cache_accesses = 0;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_reset_cache_hit_rate_stats() */
/*-------------------------------------------------------------------------
* Function: H5C_set_cache_auto_resize_config
*
* Purpose: Set the cache automatic resize configuration to the
* provided values if they are in range, and fail if they
* are not.
*
* If the new configuration enables automatic cache resizing,
* coerce the cache max size and min clean size into agreement
* with the new policy and re-set the full cache hit rate
* stats.
*
* Return: SUCCEED on success, and FAIL on failure.
*
* Programmer: John Mainzer
* 10/8/04
*
* Modifications:
*
* JRM -- 11/18/04
* Reworked function to match major changes in
* H5C_auto_size_ctl_t.
*
* JRM -- 4/25/05
* Added code to set cache_ptr->size_decreased to TRUE
* if the new configuration forces an immediate reduction
* in cache size.
*
* JRM -- 12/31/07
* Added code supporting the new flash cache size increase
* code.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_set_cache_auto_resize_config(H5C_t *cache_ptr,
H5C_auto_size_ctl_t *config_ptr)
{
herr_t result;
size_t new_max_cache_size;
size_t new_min_clean_size;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_set_cache_auto_resize_config, FAIL)
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
if ( config_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "NULL config_ptr on entry.")
}
if ( config_ptr->version != H5C__CURR_AUTO_SIZE_CTL_VER ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Unknown config version.")
}
/* check general configuration section of the config: */
if ( SUCCEED != H5C_validate_resize_config(config_ptr,
H5C_RESIZE_CFG__VALIDATE_GENERAL) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, \
"error in general configuration fields of new config.")
}
/* check size increase control fields of the config: */
if ( SUCCEED != H5C_validate_resize_config(config_ptr,
H5C_RESIZE_CFG__VALIDATE_INCREMENT) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, \
"error in the size increase control fields of new config.")
}
/* check size decrease control fields of the config: */
if ( SUCCEED != H5C_validate_resize_config(config_ptr,
H5C_RESIZE_CFG__VALIDATE_DECREMENT) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, \
"error in the size decrease control fields of new config.")
}
/* check for conflicts between size increase and size decrease controls: */
if ( SUCCEED != H5C_validate_resize_config(config_ptr,
H5C_RESIZE_CFG__VALIDATE_INTERACTIONS) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, \
"conflicting threshold fields in new config.")
}
/* will set the increase possible fields to FALSE later if needed */
cache_ptr->size_increase_possible = TRUE;
cache_ptr->flash_size_increase_possible = TRUE;
cache_ptr->size_decrease_possible = TRUE;
switch ( config_ptr->incr_mode )
{
case H5C_incr__off:
cache_ptr->size_increase_possible = FALSE;
break;
case H5C_incr__threshold:
if ( ( config_ptr->lower_hr_threshold <= 0.0 ) ||
( config_ptr->increment <= 1.0 ) ||
( ( config_ptr->apply_max_increment ) &&
( config_ptr->max_increment <= 0 ) ) ) {
cache_ptr->size_increase_possible = FALSE;
}
break;
default: /* should be unreachable */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Unknown incr_mode?!?!?.")
}
/* logically, this is were configuration for flash cache size increases
* should go. However, this configuration depends on max_cache_size, so
* we wait until the end of the function, when this field is set.
*/
switch ( config_ptr->decr_mode )
{
case H5C_decr__off:
cache_ptr->size_decrease_possible = FALSE;
break;
case H5C_decr__threshold:
if ( ( config_ptr->upper_hr_threshold >= 1.0 ) ||
( config_ptr->decrement >= 1.0 ) ||
( ( config_ptr->apply_max_decrement ) &&
( config_ptr->max_decrement <= 0 ) ) ) {
cache_ptr->size_decrease_possible = FALSE;
}
break;
case H5C_decr__age_out:
if ( ( ( config_ptr->apply_empty_reserve ) &&
( config_ptr->empty_reserve >= 1.0 ) ) ||
( ( config_ptr->apply_max_decrement ) &&
( config_ptr->max_decrement <= 0 ) ) ) {
cache_ptr->size_decrease_possible = FALSE;
}
break;
case H5C_decr__age_out_with_threshold:
if ( ( ( config_ptr->apply_empty_reserve ) &&
( config_ptr->empty_reserve >= 1.0 ) ) ||
( ( config_ptr->apply_max_decrement ) &&
( config_ptr->max_decrement <= 0 ) ) ||
( config_ptr->upper_hr_threshold >= 1.0 ) ) {
cache_ptr->size_decrease_possible = FALSE;
}
break;
default: /* should be unreachable */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Unknown decr_mode?!?!?.")
}
if ( config_ptr->max_size == config_ptr->min_size ) {
cache_ptr->size_increase_possible = FALSE;
cache_ptr->flash_size_increase_possible = FALSE;
cache_ptr->size_decrease_possible = FALSE;
}
/* flash_size_increase_possible is intentionally omitted from the
* following:
*/
cache_ptr->resize_enabled = cache_ptr->size_increase_possible ||
cache_ptr->size_decrease_possible;
cache_ptr->resize_ctl = *config_ptr;
/* Resize the cache to the supplied initial value if requested, or as
* necessary to force it within the bounds of the current automatic
* cache resizing configuration.
*
* Note that the min_clean_fraction may have changed, so we
* go through the exercise even if the current size is within
* range and an initial size has not been provided.
*/
if ( (cache_ptr->resize_ctl).set_initial_size ) {
new_max_cache_size = (cache_ptr->resize_ctl).initial_size;
}
else if ( cache_ptr->max_cache_size > (cache_ptr->resize_ctl).max_size ) {
new_max_cache_size = (cache_ptr->resize_ctl).max_size;
}
else if ( cache_ptr->max_cache_size < (cache_ptr->resize_ctl).min_size ) {
new_max_cache_size = (cache_ptr->resize_ctl).min_size;
} else {
new_max_cache_size = cache_ptr->max_cache_size;
}
new_min_clean_size = (size_t)
((double)new_max_cache_size *
((cache_ptr->resize_ctl).min_clean_fraction));
/* since new_min_clean_size is of type size_t, we have
*
* ( 0 <= new_min_clean_size )
*
* by definition.
*/
HDassert( new_min_clean_size <= new_max_cache_size );
HDassert( (cache_ptr->resize_ctl).min_size <= new_max_cache_size );
HDassert( new_max_cache_size <= (cache_ptr->resize_ctl).max_size );
if ( new_max_cache_size < cache_ptr->max_cache_size ) {
cache_ptr->size_decreased = TRUE;
}
cache_ptr->max_cache_size = new_max_cache_size;
cache_ptr->min_clean_size = new_min_clean_size;
if ( H5C_reset_cache_hit_rate_stats(cache_ptr) != SUCCEED ) {
/* this should be impossible... */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"H5C_reset_cache_hit_rate_stats failed.")
}
/* remove excess epoch markers if any */
if ( ( config_ptr->decr_mode == H5C_decr__age_out_with_threshold ) ||
( config_ptr->decr_mode == H5C_decr__age_out ) ) {
if ( cache_ptr->epoch_markers_active >
(cache_ptr->resize_ctl).epochs_before_eviction ) {
result =
H5C__autoadjust__ageout__remove_excess_markers(cache_ptr);
if ( result != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"can't remove excess epoch markers.")
}
}
} else if ( cache_ptr->epoch_markers_active > 0 ) {
result = H5C__autoadjust__ageout__remove_all_markers(cache_ptr);
if ( result != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"error removing all epoch markers.")
}
}
/* configure flash size increase facility. We wait until the
* end of the function, as we need the max_cache_size set before
* we start to keep things simple.
*
* If we haven't already ruled out flash cache size increases above,
* go ahead and configure it.
*/
if ( cache_ptr->flash_size_increase_possible ) {
switch ( config_ptr->flash_incr_mode )
{
case H5C_flash_incr__off:
cache_ptr->flash_size_increase_possible = FALSE;
break;
case H5C_flash_incr__add_space:
cache_ptr->flash_size_increase_possible = TRUE;
cache_ptr->flash_size_increase_threshold =
(size_t)
(((double)(cache_ptr->max_cache_size)) *
((cache_ptr->resize_ctl).flash_threshold));
break;
default: /* should be unreachable */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Unknown flash_incr_mode?!?!?.")
break;
}
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_set_cache_auto_resize_config() */
/*-------------------------------------------------------------------------
* Function: H5C_set_evictions_enabled()
*
* Purpose: Set cache_ptr->evictions_enabled to the value of the
* evictions enabled parameter.
*
* Return: SUCCEED on success, and FAIL on failure.
*
* Programmer: John Mainzer
* 7/27/07
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_set_evictions_enabled(H5C_t *cache_ptr,
hbool_t evictions_enabled)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_set_evictions_enabled, FAIL)
if ( ( cache_ptr == NULL ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr on entry.")
}
if ( ( evictions_enabled != TRUE ) && ( evictions_enabled != FALSE ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Bad evictions_enabled on entry.")
}
/* There is no fundamental reason why we should not permit
* evictions to be disabled while automatic resize is enabled.
* However, I can't think of any good reason why one would
* want to, and allowing it would greatly complicate testing
* the feature. Hence the following:
*/
if ( ( evictions_enabled != TRUE ) &&
( ( cache_ptr->resize_ctl.incr_mode != H5C_incr__off ) ||
( cache_ptr->resize_ctl.decr_mode != H5C_decr__off ) ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Can't disable evictions when auto resize enabled.")
}
cache_ptr->evictions_enabled = evictions_enabled;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_set_evictions_enabled() */
/*-------------------------------------------------------------------------
* Function: H5C_set_prefix
*
* Purpose: Set the values of the prefix field of H5C_t. This
* filed is used to label some debugging output.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 1/20/06
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_set_prefix(H5C_t * cache_ptr,
char * prefix)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_set_prefix, FAIL)
/* This would normally be an assert, but we need to use an HGOTO_ERROR
* call to shut up the compiler.
*/
if ( ( ! cache_ptr ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr")
}
HDassert( prefix );
HDassert( HDstrlen(prefix) < H5C__PREFIX_LEN ) ;
HDstrcpy(&(cache_ptr->prefix[0]), prefix);
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_set_prefix() */
/*-------------------------------------------------------------------------
* Function: H5C_set_skip_flags
*
* Purpose: Set the values of the skip sanity check flags.
*
* This function and the skip sanity check flags were created
* for the convenience of the test bed. However it is
* possible that there may be other uses for the flags.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 6/11/04
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_set_skip_flags(H5C_t * cache_ptr,
hbool_t skip_file_checks,
hbool_t skip_dxpl_id_checks)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_set_skip_flags, FAIL)
/* This would normally be an assert, but we need to use an HGOTO_ERROR
* call to shut up the compiler.
*/
if ( ( ! cache_ptr ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr")
}
cache_ptr->skip_file_checks = skip_file_checks;
cache_ptr->skip_dxpl_id_checks = skip_dxpl_id_checks;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_set_skip_flags() */
/*-------------------------------------------------------------------------
* Function: H5C_set_trace_file_ptr
*
* Purpose: Set the trace_file_ptr field for the cache.
*
* This field must either be NULL (which turns of trace
* file logging), or be a pointer to an open file to which
* trace file data is to be written.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 1/20/06
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_set_trace_file_ptr(H5C_t * cache_ptr,
FILE * trace_file_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_set_trace_file_ptr, FAIL)
/* This would normally be an assert, but we need to use an HGOTO_ERROR
* call to shut up the compiler.
*/
if ( ( ! cache_ptr ) || ( cache_ptr->magic != H5C__H5C_T_MAGIC ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr")
}
cache_ptr->trace_file_ptr = trace_file_ptr;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_set_trace_file_ptr() */
/*-------------------------------------------------------------------------
* Function: H5C_stats
*
* Purpose: Prints statistics about the cache.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 6/2/04
*
* Modifications:
*
* JRM -- 7/21/04
* Updated function for the addition of the hash table.
*
* JRM -- 9/8/05
* Updated function for the addition of cache entry size
* change statistics.
*
* JRM -- 1/13/06
* Added code to use the prefix field of H5C_t to allow
* tagging of statistics output.
*
* JRM -- 3/21/06
* Added code supporting the pinned entry related stats.
*
* JRM -- 8/9/06
* More code supporting pinned entry related stats.
*
* JRM -- 8/23/06
* Added code supporting new flush related statistics.
*
* JRM -- 3/31/07
* Added code supporting the new write_protects,
* read_protects, and max_read_protects fields.
*
* JRM -- 11/13/08
* Added code displaying the max_clean_index_size and
* max_dirty_index_size.
*
* MAM -- 01/06/09
* Added code displaying the calls_to_msic,
* total_entries_skipped_in_msic, total_entries_scanned_in_msic,
* and max_entries_skipped_in_msic fields.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_stats(H5C_t * cache_ptr,
const char * cache_name,
hbool_t
#if !H5C_COLLECT_CACHE_STATS
UNUSED
#endif /* H5C_COLLECT_CACHE_STATS */
display_detailed_stats)
{
herr_t ret_value = SUCCEED; /* Return value */
#if H5C_COLLECT_CACHE_STATS
int i;
int64_t total_hits = 0;
int64_t total_misses = 0;
int64_t total_write_protects = 0;
int64_t total_read_protects = 0;
int64_t max_read_protects = 0;
int64_t total_insertions = 0;
int64_t total_pinned_insertions = 0;
int64_t total_clears = 0;
int64_t total_flushes = 0;
int64_t total_evictions = 0;
int64_t total_moves = 0;
int64_t total_entry_flush_moves = 0;
int64_t total_cache_flush_moves = 0;
int64_t total_size_increases = 0;
int64_t total_size_decreases = 0;
int64_t total_entry_flush_size_changes = 0;
int64_t total_cache_flush_size_changes = 0;
int64_t total_pins = 0;
int64_t total_unpins = 0;
int64_t total_dirty_pins = 0;
int64_t total_pinned_flushes = 0;
int64_t total_pinned_clears = 0;
int32_t aggregate_max_accesses = 0;
int32_t aggregate_min_accesses = 1000000;
int32_t aggregate_max_clears = 0;
int32_t aggregate_max_flushes = 0;
size_t aggregate_max_size = 0;
int32_t aggregate_max_pins = 0;
double hit_rate;
double average_successful_search_depth = 0.0;
double average_failed_search_depth = 0.0;
double average_entries_skipped_per_calls_to_msic = 0.0;
double average_entries_scanned_per_calls_to_msic = 0.0;
#endif /* H5C_COLLECT_CACHE_STATS */
FUNC_ENTER_NOAPI(H5C_stats, FAIL)
/* This would normally be an assert, but we need to use an HGOTO_ERROR
* call to shut up the compiler.
*/
if ( ( ! cache_ptr ) ||
( cache_ptr->magic != H5C__H5C_T_MAGIC ) ||
( !cache_name ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr or cache_name")
}
#if H5C_COLLECT_CACHE_STATS
for ( i = 0; i <= cache_ptr->max_type_id; i++ ) {
total_hits += cache_ptr->hits[i];
total_misses += cache_ptr->misses[i];
total_write_protects += cache_ptr->write_protects[i];
total_read_protects += cache_ptr->read_protects[i];
if ( max_read_protects < cache_ptr->max_read_protects[i] ) {
max_read_protects = cache_ptr->max_read_protects[i];
}
total_insertions += cache_ptr->insertions[i];
total_pinned_insertions += cache_ptr->pinned_insertions[i];
total_clears += cache_ptr->clears[i];
total_flushes += cache_ptr->flushes[i];
total_evictions += cache_ptr->evictions[i];
total_moves += cache_ptr->moves[i];
total_entry_flush_moves
+= cache_ptr->entry_flush_moves[i];
total_cache_flush_moves
+= cache_ptr->cache_flush_moves[i];
total_size_increases += cache_ptr->size_increases[i];
total_size_decreases += cache_ptr->size_decreases[i];
total_entry_flush_size_changes
+= cache_ptr->entry_flush_size_changes[i];
total_cache_flush_size_changes
+= cache_ptr->cache_flush_size_changes[i];
total_pins += cache_ptr->pins[i];
total_unpins += cache_ptr->unpins[i];
total_dirty_pins += cache_ptr->dirty_pins[i];
total_pinned_flushes += cache_ptr->pinned_flushes[i];
total_pinned_clears += cache_ptr->pinned_clears[i];
#if H5C_COLLECT_CACHE_ENTRY_STATS
if ( aggregate_max_accesses < cache_ptr->max_accesses[i] )
aggregate_max_accesses = cache_ptr->max_accesses[i];
if ( aggregate_min_accesses > aggregate_max_accesses )
aggregate_min_accesses = aggregate_max_accesses;
if ( aggregate_min_accesses > cache_ptr->min_accesses[i] )
aggregate_min_accesses = cache_ptr->min_accesses[i];
if ( aggregate_max_clears < cache_ptr->max_clears[i] )
aggregate_max_clears = cache_ptr->max_clears[i];
if ( aggregate_max_flushes < cache_ptr->max_flushes[i] )
aggregate_max_flushes = cache_ptr->max_flushes[i];
if ( aggregate_max_size < cache_ptr->max_size[i] )
aggregate_max_size = cache_ptr->max_size[i];
if ( aggregate_max_pins < cache_ptr->max_pins[i] )
aggregate_max_pins = cache_ptr->max_pins[i];
#endif /* H5C_COLLECT_CACHE_ENTRY_STATS */
}
if ( ( total_hits > 0 ) || ( total_misses > 0 ) ) {
hit_rate = 100.0 * ((double)(total_hits)) /
((double)(total_hits + total_misses));
} else {
hit_rate = 0.0;
}
if ( cache_ptr->successful_ht_searches > 0 ) {
average_successful_search_depth =
((double)(cache_ptr->total_successful_ht_search_depth)) /
((double)(cache_ptr->successful_ht_searches));
}
if ( cache_ptr->failed_ht_searches > 0 ) {
average_failed_search_depth =
((double)(cache_ptr->total_failed_ht_search_depth)) /
((double)(cache_ptr->failed_ht_searches));
}
HDfprintf(stdout, "\n%sH5C: cache statistics for %s\n",
cache_ptr->prefix, cache_name);
HDfprintf(stdout, "\n");
HDfprintf(stdout,
"%s hash table insertion / deletions = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->total_ht_insertions),
(long)(cache_ptr->total_ht_deletions));
HDfprintf(stdout,
"%s HT successful / failed searches = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->successful_ht_searches),
(long)(cache_ptr->failed_ht_searches));
HDfprintf(stdout,
"%s Av. HT suc / failed search depth = %f / %f\n",
cache_ptr->prefix,
average_successful_search_depth,
average_failed_search_depth);
HDfprintf(stdout,
"%s current (max) index size / length = %ld (%ld) / %ld (%ld)\n",
cache_ptr->prefix,
(long)(cache_ptr->index_size),
(long)(cache_ptr->max_index_size),
(long)(cache_ptr->index_len),
(long)(cache_ptr->max_index_len));
HDfprintf(stdout,
"%s current (max) clean/dirty idx size = %ld (%ld) / %ld (%ld)\n",
cache_ptr->prefix,
(long)(cache_ptr->clean_index_size),
(long)(cache_ptr->max_clean_index_size),
(long)(cache_ptr->dirty_index_size),
(long)(cache_ptr->max_dirty_index_size));
HDfprintf(stdout,
"%s current (max) slist size / length = %ld (%ld) / %ld (%ld)\n",
cache_ptr->prefix,
(long)(cache_ptr->slist_size),
(long)(cache_ptr->max_slist_size),
(long)(cache_ptr->slist_len),
(long)(cache_ptr->max_slist_len));
HDfprintf(stdout,
"%s current (max) PL size / length = %ld (%ld) / %ld (%ld)\n",
cache_ptr->prefix,
(long)(cache_ptr->pl_size),
(long)(cache_ptr->max_pl_size),
(long)(cache_ptr->pl_len),
(long)(cache_ptr->max_pl_len));
HDfprintf(stdout,
"%s current (max) PEL size / length = %ld (%ld) / %ld (%ld)\n",
cache_ptr->prefix,
(long)(cache_ptr->pel_size),
(long)(cache_ptr->max_pel_size),
(long)(cache_ptr->pel_len),
(long)(cache_ptr->max_pel_len));
HDfprintf(stdout,
"%s current LRU list size / length = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->LRU_list_size),
(long)(cache_ptr->LRU_list_len));
HDfprintf(stdout,
"%s current clean LRU size / length = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->cLRU_list_size),
(long)(cache_ptr->cLRU_list_len));
HDfprintf(stdout,
"%s current dirty LRU size / length = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->dLRU_list_size),
(long)(cache_ptr->dLRU_list_len));
HDfprintf(stdout,
"%s Total hits / misses / hit_rate = %ld / %ld / %f\n",
cache_ptr->prefix,
(long)total_hits,
(long)total_misses,
hit_rate);
HDfprintf(stdout,
"%s Total write / read (max) protects = %ld / %ld (%ld)\n",
cache_ptr->prefix,
(long)total_write_protects,
(long)total_read_protects,
(long)max_read_protects);
HDfprintf(stdout,
"%s Total clears / flushes / evictions = %ld / %ld / %ld\n",
cache_ptr->prefix,
(long)total_clears,
(long)total_flushes,
(long)total_evictions);
HDfprintf(stdout,
"%s Total insertions(pinned) / moves = %ld(%ld) / %ld\n",
cache_ptr->prefix,
(long)total_insertions,
(long)total_pinned_insertions,
(long)total_moves);
HDfprintf(stdout,
"%s Total entry / cache flush moves = %ld / %ld\n",
cache_ptr->prefix,
(long)total_entry_flush_moves,
(long)total_cache_flush_moves);
HDfprintf(stdout, "%s Total entry size incrs / decrs = %ld / %ld\n",
cache_ptr->prefix,
(long)total_size_increases,
(long)total_size_decreases);
HDfprintf(stdout, "%s Ttl entry/cache flush size changes = %ld / %ld\n",
cache_ptr->prefix,
(long)total_entry_flush_size_changes,
(long)total_cache_flush_size_changes);
HDfprintf(stdout,
"%s Total entry pins (dirty) / unpins = %ld (%ld) / %ld\n",
cache_ptr->prefix,
(long)total_pins,
(long)total_dirty_pins,
(long)total_unpins);
HDfprintf(stdout, "%s Total pinned flushes / clears = %ld / %ld\n",
cache_ptr->prefix,
(long)total_pinned_flushes,
(long)total_pinned_clears);
HDfprintf(stdout, "%s MSIC: (make space in cache) calls = %lld\n",
cache_ptr->prefix,
(long long)(cache_ptr->calls_to_msic));
if (cache_ptr->calls_to_msic > 0) {
average_entries_skipped_per_calls_to_msic =
(((double)(cache_ptr->total_entries_skipped_in_msic)) /
((double)(cache_ptr->calls_to_msic)));
}
HDfprintf(stdout, "%s MSIC: Average/max entries skipped = %lf / %ld\n",
cache_ptr->prefix,
(float)average_entries_skipped_per_calls_to_msic,
(long)(cache_ptr->max_entries_skipped_in_msic));
if (cache_ptr->calls_to_msic > 0) {
average_entries_scanned_per_calls_to_msic =
(((double)(cache_ptr->total_entries_scanned_in_msic)) /
((double)(cache_ptr->calls_to_msic)));
}
HDfprintf(stdout, "%s MSIC: Average/max entries scanned = %lf / %ld\n",
cache_ptr->prefix,
(float)average_entries_scanned_per_calls_to_msic,
(long)(cache_ptr->max_entries_scanned_in_msic));
HDfprintf(stdout, "%s MSIC: Scanned to make space(evict) = %lld\n",
cache_ptr->prefix,
(long long)(cache_ptr->entries_scanned_to_make_space));
HDfprintf(stdout, "%s MSIC: Scanned to satisfy min_clean = %lld\n",
cache_ptr->prefix,
(long long)(cache_ptr->total_entries_scanned_in_msic -
cache_ptr->entries_scanned_to_make_space));
#if H5C_COLLECT_CACHE_ENTRY_STATS
HDfprintf(stdout, "%s aggregate max / min accesses = %d / %d\n",
cache_ptr->prefix,
(int)aggregate_max_accesses,
(int)aggregate_min_accesses);
HDfprintf(stdout, "%s aggregate max_clears / max_flushes = %d / %d\n",
cache_ptr->prefix,
(int)aggregate_max_clears,
(int)aggregate_max_flushes);
HDfprintf(stdout, "%s aggregate max_size / max_pins = %d / %d\n",
cache_ptr->prefix,
(int)aggregate_max_size,
(int)aggregate_max_pins);
#endif /* H5C_COLLECT_CACHE_ENTRY_STATS */
if ( display_detailed_stats )
{
for ( i = 0; i <= cache_ptr->max_type_id; i++ ) {
HDfprintf(stdout, "\n");
HDfprintf(stdout, "%s Stats on %s:\n",
cache_ptr->prefix,
((cache_ptr->type_name_table_ptr))[i]);
if ( ( cache_ptr->hits[i] > 0 ) || ( cache_ptr->misses[i] > 0 ) ) {
hit_rate = 100.0 * ((double)(cache_ptr->hits[i])) /
((double)(cache_ptr->hits[i] + cache_ptr->misses[i]));
} else {
hit_rate = 0.0;
}
HDfprintf(stdout,
"%s hits / misses / hit_rate = %ld / %ld / %f\n",
cache_ptr->prefix,
(long)(cache_ptr->hits[i]),
(long)(cache_ptr->misses[i]),
hit_rate);
HDfprintf(stdout,
"%s write / read (max) protects = %ld / %ld (%d)\n",
cache_ptr->prefix,
(long)(cache_ptr->write_protects[i]),
(long)(cache_ptr->read_protects[i]),
(int)(cache_ptr->max_read_protects[i]));
HDfprintf(stdout,
"%s clears / flushes / evictions = %ld / %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->clears[i]),
(long)(cache_ptr->flushes[i]),
(long)(cache_ptr->evictions[i]));
HDfprintf(stdout,
"%s insertions(pinned) / moves = %ld(%ld) / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->insertions[i]),
(long)(cache_ptr->pinned_insertions[i]),
(long)(cache_ptr->moves[i]));
HDfprintf(stdout,
"%s entry / cache flush moves = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->entry_flush_moves[i]),
(long)(cache_ptr->cache_flush_moves[i]));
HDfprintf(stdout,
"%s size increases / decreases = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->size_increases[i]),
(long)(cache_ptr->size_decreases[i]));
HDfprintf(stdout,
"%s entry/cache flush size changes = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->entry_flush_size_changes[i]),
(long)(cache_ptr->cache_flush_size_changes[i]));
HDfprintf(stdout,
"%s entry pins / unpins = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->pins[i]),
(long)(cache_ptr->unpins[i]));
HDfprintf(stdout,
"%s entry dirty pins/pin'd flushes = %ld / %ld\n",
cache_ptr->prefix,
(long)(cache_ptr->dirty_pins[i]),
(long)(cache_ptr->pinned_flushes[i]));
#if H5C_COLLECT_CACHE_ENTRY_STATS
HDfprintf(stdout,
"%s entry max / min accesses = %d / %d\n",
cache_ptr->prefix,
cache_ptr->max_accesses[i],
cache_ptr->min_accesses[i]);
HDfprintf(stdout,
"%s entry max_clears / max_flushes = %d / %d\n",
cache_ptr->prefix,
cache_ptr->max_clears[i],
cache_ptr->max_flushes[i]);
HDfprintf(stdout,
"%s entry max_size / max_pins = %d / %d\n",
cache_ptr->prefix,
(int)(cache_ptr->max_size[i]),
(int)(cache_ptr->max_pins[i]));
#endif /* H5C_COLLECT_CACHE_ENTRY_STATS */
}
}
HDfprintf(stdout, "\n");
#endif /* H5C_COLLECT_CACHE_STATS */
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_stats() */
/*-------------------------------------------------------------------------
*
* Function: H5C_stats__reset
*
* Purpose: Reset the stats fields to their initial values.
*
* Return: void
*
* Programmer: John Mainzer, 4/28/04
*
* Modifications:
*
* JRM - 7/21/04
* Updated for hash table related statistics.
*
* JRM - 9/8/05
* Updated for size increase / decrease statistics.
*
* JRM - 3/20/06
* Updated for pin / unpin related statistics.
*
* JRM - 8/9/06
* Further updates for pin related statistics.
*
* JRM 8/23/06
* Added initialization code for new flush related statistics.
*
* JRM 2/16/07
* Added conditional compile code to avoid unused parameter
* warning in the production build.
*
* JRM 3/31/07
* Added initialization for the new write_protects,
* read_protects, and max_read_protects fields.
*
* JRM 11/13/08
* Added initialization for the new max_clean_index_size and
* max_dirty_index_size fields.
*
* MAM -- 01/06/09
* Added code to initalize the calls_to_msic,
* total_entries_skipped_in_msic, total_entries_scanned_in_msic,
* and max_entries_skipped_in_msic fields.
*
*-------------------------------------------------------------------------
*/
void
#ifndef NDEBUG
H5C_stats__reset(H5C_t * cache_ptr)
#else /* NDEBUG */
#if H5C_COLLECT_CACHE_STATS
H5C_stats__reset(H5C_t * cache_ptr)
#else /* H5C_COLLECT_CACHE_STATS */
H5C_stats__reset(H5C_t UNUSED * cache_ptr)
#endif /* H5C_COLLECT_CACHE_STATS */
#endif /* NDEBUG */
{
#if H5C_COLLECT_CACHE_STATS
int i;
#endif /* H5C_COLLECT_CACHE_STATS */
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
#if H5C_COLLECT_CACHE_STATS
for ( i = 0; i <= cache_ptr->max_type_id; i++ )
{
cache_ptr->hits[i] = 0;
cache_ptr->misses[i] = 0;
cache_ptr->write_protects[i] = 0;
cache_ptr->read_protects[i] = 0;
cache_ptr->max_read_protects[i] = 0;
cache_ptr->insertions[i] = 0;
cache_ptr->pinned_insertions[i] = 0;
cache_ptr->clears[i] = 0;
cache_ptr->flushes[i] = 0;
cache_ptr->evictions[i] = 0;
cache_ptr->moves[i] = 0;
cache_ptr->entry_flush_moves[i] = 0;
cache_ptr->cache_flush_moves[i] = 0;
cache_ptr->pins[i] = 0;
cache_ptr->unpins[i] = 0;
cache_ptr->dirty_pins[i] = 0;
cache_ptr->pinned_flushes[i] = 0;
cache_ptr->pinned_clears[i] = 0;
cache_ptr->size_increases[i] = 0;
cache_ptr->size_decreases[i] = 0;
cache_ptr->entry_flush_size_changes[i] = 0;
cache_ptr->cache_flush_size_changes[i] = 0;
}
cache_ptr->total_ht_insertions = 0;
cache_ptr->total_ht_deletions = 0;
cache_ptr->successful_ht_searches = 0;
cache_ptr->total_successful_ht_search_depth = 0;
cache_ptr->failed_ht_searches = 0;
cache_ptr->total_failed_ht_search_depth = 0;
cache_ptr->max_index_len = 0;
cache_ptr->max_index_size = (size_t)0;
cache_ptr->max_clean_index_size = (size_t)0;
cache_ptr->max_dirty_index_size = (size_t)0;
cache_ptr->max_slist_len = 0;
cache_ptr->max_slist_size = (size_t)0;
cache_ptr->max_pl_len = 0;
cache_ptr->max_pl_size = (size_t)0;
cache_ptr->max_pel_len = 0;
cache_ptr->max_pel_size = (size_t)0;
cache_ptr->calls_to_msic = 0;
cache_ptr->total_entries_skipped_in_msic = 0;
cache_ptr->total_entries_scanned_in_msic = 0;
cache_ptr->max_entries_skipped_in_msic = 0;
cache_ptr->max_entries_scanned_in_msic = 0;
cache_ptr->entries_scanned_to_make_space = 0;
#if H5C_COLLECT_CACHE_ENTRY_STATS
for ( i = 0; i <= cache_ptr->max_type_id; i++ )
{
cache_ptr->max_accesses[i] = 0;
cache_ptr->min_accesses[i] = 1000000;
cache_ptr->max_clears[i] = 0;
cache_ptr->max_flushes[i] = 0;
cache_ptr->max_size[i] = (size_t)0;
cache_ptr->max_pins[i] = 0;
}
#endif /* H5C_COLLECT_CACHE_ENTRY_STATS */
#endif /* H5C_COLLECT_CACHE_STATS */
return;
} /* H5C_stats__reset() */
/*-------------------------------------------------------------------------
* Function: H5C_unpin_entry()
*
* Purpose: Unpin a cache entry. The entry must be unprotected at
* the time of call, and must be pinned.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 3/22/06
*
* Modifications:
*
* JRM -- 4/26/06
* Modified routine to allow it to operate on protected
* entries.
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_unpin_entry(void *_entry_ptr)
{
H5C_t * cache_ptr;
H5C_cache_entry_t * entry_ptr = (H5C_cache_entry_t *)_entry_ptr; /* Pointer to entry to unpin */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_unpin_entry, FAIL)
/* Sanity check */
HDassert(entry_ptr);
cache_ptr = entry_ptr->cache_ptr;
HDassert(cache_ptr);
HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
if ( ! ( entry_ptr->is_pinned ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "Entry isn't pinned")
}
if ( ! ( entry_ptr->is_protected ) ) {
H5C__UPDATE_RP_FOR_UNPIN(cache_ptr, entry_ptr, FAIL)
}
entry_ptr->is_pinned = FALSE;
H5C__UPDATE_STATS_FOR_UNPIN(cache_ptr, entry_ptr)
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_unpin_entry() */
/*-------------------------------------------------------------------------
* Function: H5C_unprotect
*
* Purpose: Undo an H5C_protect() call -- specifically, mark the
* entry as unprotected, remove it from the protected list,
* and give it back to the replacement policy.
*
* The TYPE and ADDR arguments must be the same as those in
* the corresponding call to H5C_protect() and the THING
* argument must be the value returned by that call to
* H5C_protect().
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used on the first write occasioned
* by the unprotect (primary_dxpl_id), and on all subsequent
* writes (secondary_dxpl_id). Since an uprotect cannot
* occasion a write at present, all this is moot for now.
* However, things change, and in any case,
* H5C_flush_single_entry() needs primary_dxpl_id and
* secondary_dxpl_id in its parameter list.
*
* The function can't cause a read either, so the dxpl_id
* parameters are moot in this case as well.
*
* Return: Non-negative on success/Negative on failure
*
* If the deleted flag is TRUE, simply remove the target entry
* from the cache, clear it, and free it without writing it to
* disk.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 6/2/04
*
* Modifications:
*
* JRM -- 7/21/04
* Updated the function for the addition of the hash table.
* In particular, we now add dirty entries to the tree if
* they aren't in the tree already.
*
* JRM -- 1/6/05
* Added the flags parameter, and code supporting
* H5C__SET_FLUSH_MARKER_FLAG. Note that this flag is
* ignored unless the new entry is dirty. Also note that
* once the flush_marker field of an entry is set, the
* only way it can be reset is by being flushed.
*
* JRM -- 6/3/05
* Added the dirtied parameter and supporting code. This
* is part of an effort to move management of the is_dirty
* field into the cache code. This has become necessary
* to repair a cache coherency bug in PHDF5.
*
* JRM -- 7/5/05
* Added code supporting the new clear_on_unprotect field
* of H5C_cache_entry_t. This change is also part of the
* above mentioned cache coherency bug fix in PHDF5.
*
* JRM -- 9/8/05
* Added the size_changed and new_size parameters and the
* supporting code. Since the metadata cache synchronizes
* on dirty bytes creation in the PHDF5 case, we must now
* track changes in entry size.
*
* Note that the new_size parameter is ignored unless the
* size_changed parameter is TRUE. In this case, the new_size
* must be positive.
*
* Also observe that if size_changed is TRUE, dirtied must be
* TRUE.
*
* JRM -- 9/23/05
* Moved the size_changed parameter into flags.
*
* JRM -- 3/21/06
* Unpdated function to pin and unpin entries as directed via
* the new H5C__PIN_ENTRY_FLAG and H5C__UNPIN_ENTRY_FLAG flags.
*
* JRM -- 5/3/06
* Added code to make use of the new dirtied field in
* H5C_cache_entry_t. If this field is TRUE, it is the
* equivalent of setting the H5C__DIRTIED_FLAG.
*
* JRM -- 3/29/07
* Modified function to allow a entry to be protected
* more than once if the entry is protected read only.
*
* Also added sanity checks using the new is_read_only and
* ro_ref_count parameters.
*
* JRM -- 12/31/07
* Modified function to support flash cache resizes.
*
* QAK -- 1/31/08
* Modified function to support freeing file space in client's
* 'dest' callback routine.
*
* QAK -- 2/07/08
* Separated "destroy entry" concept from "remove entry from
* cache" concept, by adding the 'take_ownership' flag.
*
* JRM -- 11/5/08
* Added code to update the clean_index_size and
* dirty_index_size fields of H5C_t in cases where the
* the entry was clean on protect, was marked dirty on
* unprotect, and did not change its size. Do this via
* a call to H5C__UPDATE_INDEX_FOR_ENTRY_DIRTY().
*
* If the size changed, this case is already dealt with by
* by the pre-existing call to
* H5C__UPDATE_INDEX_FOR_SIZE_CHANGE().
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_unprotect(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
const H5C_class_t * type,
haddr_t addr,
void * thing,
unsigned int flags,
size_t new_size)
{
H5C_t * cache_ptr;
hbool_t deleted;
hbool_t dirtied;
hbool_t set_flush_marker;
hbool_t size_changed;
hbool_t pin_entry;
hbool_t unpin_entry;
hbool_t free_file_space;
hbool_t take_ownership;
hbool_t was_clean;
#ifdef H5_HAVE_PARALLEL
hbool_t clear_entry = FALSE;
#endif /* H5_HAVE_PARALLEL */
herr_t result;
size_t size_increase = 0;
H5C_cache_entry_t * entry_ptr;
H5C_cache_entry_t * test_entry_ptr;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_unprotect, FAIL)
deleted = ( (flags & H5C__DELETED_FLAG) != 0 );
dirtied = ( (flags & H5C__DIRTIED_FLAG) != 0 );
set_flush_marker = ( (flags & H5C__SET_FLUSH_MARKER_FLAG) != 0 );
size_changed = ( (flags & H5C__SIZE_CHANGED_FLAG) != 0 );
pin_entry = ( (flags & H5C__PIN_ENTRY_FLAG) != 0 );
unpin_entry = ( (flags & H5C__UNPIN_ENTRY_FLAG) != 0 );
free_file_space = ( (flags & H5C__FREE_FILE_SPACE_FLAG) != 0 );
take_ownership = ( (flags & H5C__TAKE_OWNERSHIP_FLAG) != 0 );
/* Changing the size of an entry dirties it. Thus, set the
* dirtied flag if the size_changed flag is set.
*/
dirtied |= size_changed;
HDassert( f );
HDassert( f->shared );
cache_ptr = f->shared->cache;
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f );
HDassert( type );
HDassert( type->clear );
HDassert( type->flush );
HDassert( H5F_addr_defined(addr) );
HDassert( thing );
HDassert( ( size_changed == TRUE ) || ( size_changed == FALSE ) );
HDassert( ( ! size_changed ) || ( dirtied ) );
HDassert( ( ! size_changed ) || ( new_size > 0 ) );
HDassert( ! ( pin_entry && unpin_entry ) );
HDassert( ( ! free_file_space ) || ( deleted ) ); /* deleted flag must accompany free_file_space */
HDassert( ( ! take_ownership ) || ( deleted ) ); /* deleted flag must accompany take_ownership */
HDassert( ! ( free_file_space && take_ownership ) ); /* can't have both free_file_space & take_ownership */
entry_ptr = (H5C_cache_entry_t *)thing;
HDassert( entry_ptr->addr == addr );
HDassert( entry_ptr->type == type );
/* also set the dirtied variable if the dirtied field is set in
* the entry.
*/
dirtied |= entry_ptr->dirtied;
was_clean = ! ( entry_ptr->is_dirty );
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
/* if the entry has multiple read only protects, just decrement
* the ro_ref_counter. Don't actually unprotect until the ref count
* drops to zero.
*/
if ( entry_ptr->ro_ref_count > 1 ) {
HDassert( entry_ptr->is_protected );
HDassert( entry_ptr->is_read_only );
if ( dirtied ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"Read only entry modified(1)??")
}
(entry_ptr->ro_ref_count)--;
/* Pin or unpin the entry as requested. */
if ( pin_entry ) {
if ( entry_ptr->is_pinned ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, \
"Entry already pinned???")
}
entry_ptr->is_pinned = TRUE;
H5C__UPDATE_STATS_FOR_PIN(cache_ptr, entry_ptr)
} else if ( unpin_entry ) {
if ( ! ( entry_ptr->is_pinned ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, \
"Entry already unpinned???")
}
entry_ptr->is_pinned = FALSE;
H5C__UPDATE_STATS_FOR_UNPIN(cache_ptr, entry_ptr)
}
} else {
if ( entry_ptr->is_read_only ) {
HDassert( entry_ptr->ro_ref_count == 1 );
if ( dirtied ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"Read only entry modified(2)??")
}
entry_ptr->is_read_only = FALSE;
entry_ptr->ro_ref_count = 0;
}
#ifdef H5_HAVE_PARALLEL
/* When the H5C code is used to implement the metadata cache in the
* PHDF5 case, only the cache on process 0 is allowed to write to file.
* All the other metadata caches must hold dirty entries until they
* are told that the entries are clean.
*
* The clear_on_unprotect flag in the H5C_cache_entry_t structure
* exists to deal with the case in which an entry is protected when
* its cache receives word that the entry is now clean. In this case,
* the clear_on_unprotect flag is set, and the entry is flushed with
* the H5C__FLUSH_CLEAR_ONLY_FLAG.
*
* All this is a bit awkward, but until the metadata cache entries
* are contiguous, with only one dirty flag, we have to let the supplied
* functions deal with the reseting the is_dirty flag.
*/
if ( entry_ptr->clear_on_unprotect ) {
HDassert( entry_ptr->is_dirty );
entry_ptr->clear_on_unprotect = FALSE;
if ( ! dirtied ) {
clear_entry = TRUE;
}
}
#endif /* H5_HAVE_PARALLEL */
if ( ! (entry_ptr->is_protected) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"Entry already unprotected??")
}
/* mark the entry as dirty if appropriate */
entry_ptr->is_dirty = ( (entry_ptr->is_dirty) || dirtied );
/* update for change in entry size if necessary */
if ( ( size_changed ) && ( entry_ptr->size != new_size ) ) {
/* do a flash cache size increase if appropriate */
if ( cache_ptr->flash_size_increase_possible ) {
if ( new_size > entry_ptr->size ) {
size_increase = new_size - entry_ptr->size;
if ( size_increase >=
cache_ptr->flash_size_increase_threshold ) {
result = H5C__flash_increase_cache_size(cache_ptr,
entry_ptr->size,
new_size);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"H5C__flash_increase_cache_size failed.")
}
}
}
}
/* update the protected list */
H5C__DLL_UPDATE_FOR_SIZE_CHANGE((cache_ptr->pl_len), \
(cache_ptr->pl_size), \
(entry_ptr->size), (new_size));
/* update the hash table */
H5C__UPDATE_INDEX_FOR_SIZE_CHANGE((cache_ptr), (entry_ptr->size), \
(new_size), (entry_ptr), \
(was_clean));
/* if the entry is in the skip list, update that too */
if ( entry_ptr->in_slist ) {
H5C__UPDATE_SLIST_FOR_SIZE_CHANGE((cache_ptr), \
(entry_ptr->size),\
(new_size));
}
/* update statistics just before changing the entry size */
H5C__UPDATE_STATS_FOR_ENTRY_SIZE_CHANGE((cache_ptr), (entry_ptr), \
(new_size));
/* finally, update the entry size proper */
entry_ptr->size = new_size;
} else if ( ( was_clean ) && ( entry_ptr->is_dirty ) ) {
H5C__UPDATE_INDEX_FOR_ENTRY_DIRTY(cache_ptr, entry_ptr)
}
/* Pin or unpin the entry as requested. */
if ( pin_entry ) {
if ( entry_ptr->is_pinned ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, \
"Entry already pinned???")
}
entry_ptr->is_pinned = TRUE;
H5C__UPDATE_STATS_FOR_PIN(cache_ptr, entry_ptr)
} else if ( unpin_entry ) {
if ( ! ( entry_ptr->is_pinned ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, \
"Entry already unpinned???")
}
entry_ptr->is_pinned = FALSE;
H5C__UPDATE_STATS_FOR_UNPIN(cache_ptr, entry_ptr)
}
/* H5C__UPDATE_RP_FOR_UNPROTECT will places the unprotected entry on
* the pinned entry list if entry_ptr->is_pined is TRUE.
*/
H5C__UPDATE_RP_FOR_UNPROTECT(cache_ptr, entry_ptr, FAIL)
entry_ptr->is_protected = FALSE;
/* if the entry is dirty, 'or' its flush_marker with the set flush flag,
* and then add it to the skip list if it isn't there already.
*/
if ( entry_ptr->is_dirty ) {
entry_ptr->flush_marker |= set_flush_marker;
if ( ! (entry_ptr->in_slist) ) {
H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL)
}
}
/* this implementation of the "deleted" option is a bit inefficient, as
* we re-insert the entry to be deleted into the replacement policy
* data structures, only to remove them again. Depending on how often
* we do this, we may want to optimize a bit.
*
* On the other hand, this implementation is reasonably clean, and
* makes good use of existing code.
* JRM - 5/19/04
*/
if ( deleted ) {
/* the following first flush flag will never be used as we are
* calling H5C_flush_single_entry with both the
* H5C__FLUSH_CLEAR_ONLY_FLAG and H5C__FLUSH_INVALIDATE_FLAG flags.
* However, it is needed for the function call.
*/
hbool_t dummy_first_flush = TRUE;
unsigned flush_flags = (H5C__FLUSH_CLEAR_ONLY_FLAG |
H5C__FLUSH_INVALIDATE_FLAG);
/* we can't delete a pinned entry */
HDassert ( ! (entry_ptr->is_pinned ) );
/* verify that the target entry is in the cache. */
H5C__SEARCH_INDEX(cache_ptr, addr, test_entry_ptr, FAIL)
if ( test_entry_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"entry not in hash table?!?.")
}
else if ( test_entry_ptr != entry_ptr ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"hash table contains multiple entries for addr?!?.")
}
/* Pass along 'free file space' flag to cache client */
entry_ptr->free_file_space_on_destroy = free_file_space;
/* Set the "take ownership" flag for the flush, if needed */
if ( take_ownership) {
flush_flags |= H5C__TAKE_OWNERSHIP_FLAG;
}
if ( H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
type,
addr,
flush_flags,
&dummy_first_flush,
TRUE) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Can't flush.")
}
}
#ifdef H5_HAVE_PARALLEL
else if ( clear_entry ) {
/* the following first flush flag will never be used as we are
* calling H5C_flush_single_entry with the
* H5C__FLUSH_CLEAR_ONLY_FLAG flag. However, it is needed for
* the function call.
*/
hbool_t dummy_first_flush = TRUE;
/* verify that the target entry is in the cache. */
H5C__SEARCH_INDEX(cache_ptr, addr, test_entry_ptr, FAIL)
if ( test_entry_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"entry not in hash table?!?.")
}
else if ( test_entry_ptr != entry_ptr ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, \
"hash table contains multiple entries for addr?!?.")
}
if ( H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
type,
addr,
H5C__FLUSH_CLEAR_ONLY_FLAG,
&dummy_first_flush,
TRUE) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Can't clear.")
}
}
#endif /* H5_HAVE_PARALLEL */
}
H5C__UPDATE_STATS_FOR_UNPROTECT(cache_ptr)
done:
#if H5C_DO_EXTREME_SANITY_CHECKS
if ( H5C_validate_lru_list(cache_ptr) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"LRU sanity check failed.\n");
}
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_unprotect() */
/*-------------------------------------------------------------------------
* Function: H5C_validate_resize_config()
*
* Purpose: Run a sanity check on the specified sections of the
* provided instance of struct H5C_auto_size_ctl_t.
*
* Do nothing and return SUCCEED if no errors are detected,
* and flag an error and return FAIL otherwise.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: John Mainzer
* 3/23/05
*
* Modifications:
*
* Added validation for the flash increment fields.
*
* JRM -- 12/31/07
*
*-------------------------------------------------------------------------
*/
herr_t
H5C_validate_resize_config(H5C_auto_size_ctl_t * config_ptr,
unsigned int tests)
{
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI(H5C_validate_resize_config, FAIL)
if ( config_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "NULL config_ptr on entry.")
}
if ( config_ptr->version != H5C__CURR_AUTO_SIZE_CTL_VER ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Unknown config version.")
}
if ( (tests & H5C_RESIZE_CFG__VALIDATE_GENERAL) != 0 ) {
if ( ( config_ptr->set_initial_size != TRUE ) &&
( config_ptr->set_initial_size != FALSE ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"set_initial_size must be either TRUE or FALSE");
}
if ( config_ptr->max_size > H5C__MAX_MAX_CACHE_SIZE ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "max_size too big");
}
if ( config_ptr->min_size < H5C__MIN_MAX_CACHE_SIZE ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "min_size too small");
}
if ( config_ptr->min_size > config_ptr->max_size ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "min_size > max_size");
}
if ( ( config_ptr->set_initial_size ) &&
( ( config_ptr->initial_size < config_ptr->min_size ) ||
( config_ptr->initial_size > config_ptr->max_size ) ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"initial_size must be in the interval [min_size, max_size]");
}
if ( ( config_ptr->min_clean_fraction < 0.0 ) ||
( config_ptr->min_clean_fraction > 1.0 ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"min_clean_fraction must be in the interval [0.0, 1.0]");
}
if ( config_ptr->epoch_length < H5C__MIN_AR_EPOCH_LENGTH ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "epoch_length too small");
}
if ( config_ptr->epoch_length > H5C__MAX_AR_EPOCH_LENGTH ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "epoch_length too big");
}
} /* H5C_RESIZE_CFG__VALIDATE_GENERAL */
if ( (tests & H5C_RESIZE_CFG__VALIDATE_INCREMENT) != 0 ) {
if ( ( config_ptr->incr_mode != H5C_incr__off ) &&
( config_ptr->incr_mode != H5C_incr__threshold ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "Invalid incr_mode");
}
if ( config_ptr->incr_mode == H5C_incr__threshold ) {
if ( ( config_ptr->lower_hr_threshold < 0.0 ) ||
( config_ptr->lower_hr_threshold > 1.0 ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"lower_hr_threshold must be in the range [0.0, 1.0]");
}
if ( config_ptr->increment < 1.0 ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"increment must be greater than or equal to 1.0");
}
if ( ( config_ptr->apply_max_increment != TRUE ) &&
( config_ptr->apply_max_increment != FALSE ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"apply_max_increment must be either TRUE or FALSE");
}
/* no need to check max_increment, as it is a size_t,
* and thus must be non-negative.
*/
} /* H5C_incr__threshold */
switch ( config_ptr->flash_incr_mode )
{
case H5C_flash_incr__off:
/* nothing to do here */
break;
case H5C_flash_incr__add_space:
if ( ( config_ptr->flash_multiple < 0.1 ) ||
( config_ptr->flash_multiple > 10.0 ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"flash_multiple must be in the range [0.1, 10.0]");
}
if ( ( config_ptr->flash_threshold < 0.1 ) ||
( config_ptr->flash_threshold > 1.0 ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"flash_threshold must be in the range [0.1, 1.0]");
}
break;
default:
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"Invalid flash_incr_mode");
break;
}
} /* H5C_RESIZE_CFG__VALIDATE_INCREMENT */
if ( (tests & H5C_RESIZE_CFG__VALIDATE_DECREMENT) != 0 ) {
if ( ( config_ptr->decr_mode != H5C_decr__off ) &&
( config_ptr->decr_mode != H5C_decr__threshold ) &&
( config_ptr->decr_mode != H5C_decr__age_out ) &&
( config_ptr->decr_mode != H5C_decr__age_out_with_threshold )
) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "Invalid decr_mode");
}
if ( config_ptr->decr_mode == H5C_decr__threshold ) {
if ( config_ptr->upper_hr_threshold > 1.0 ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"upper_hr_threshold must be <= 1.0");
}
if ( ( config_ptr->decrement > 1.0 ) ||
( config_ptr->decrement < 0.0 ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"decrement must be in the interval [0.0, 1.0]");
}
/* no need to check max_decrement as it is a size_t
* and thus must be non-negative.
*/
} /* H5C_decr__threshold */
if ( ( config_ptr->decr_mode == H5C_decr__age_out ) ||
( config_ptr->decr_mode == H5C_decr__age_out_with_threshold )
) {
if ( config_ptr->epochs_before_eviction < 1 ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"epochs_before_eviction must be positive");
}
if ( config_ptr->epochs_before_eviction > H5C__MAX_EPOCH_MARKERS ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"epochs_before_eviction too big");
}
if ( ( config_ptr->apply_empty_reserve != TRUE ) &&
( config_ptr->apply_empty_reserve != FALSE ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"apply_empty_reserve must be either TRUE or FALSE");
}
if ( ( config_ptr->apply_empty_reserve ) &&
( ( config_ptr->empty_reserve > 1.0 ) ||
( config_ptr->empty_reserve < 0.0 ) ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"empty_reserve must be in the interval [0.0, 1.0]");
}
/* no need to check max_decrement as it is a size_t
* and thus must be non-negative.
*/
} /* H5C_decr__age_out || H5C_decr__age_out_with_threshold */
if ( config_ptr->decr_mode == H5C_decr__age_out_with_threshold ) {
if ( ( config_ptr->upper_hr_threshold > 1.0 ) ||
( config_ptr->upper_hr_threshold < 0.0 ) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"upper_hr_threshold must be in the interval [0.0, 1.0]");
}
} /* H5C_decr__age_out_with_threshold */
} /* H5C_RESIZE_CFG__VALIDATE_DECREMENT */
if ( (tests & H5C_RESIZE_CFG__VALIDATE_INTERACTIONS) != 0 ) {
if ( ( config_ptr->incr_mode == H5C_incr__threshold )
&&
( ( config_ptr->decr_mode == H5C_decr__threshold )
||
( config_ptr->decr_mode == H5C_decr__age_out_with_threshold )
)
&&
( config_ptr->lower_hr_threshold
>=
config_ptr->upper_hr_threshold
)
) {
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, \
"conflicting threshold fields in config.")
}
} /* H5C_RESIZE_CFG__VALIDATE_INTERACTIONS */
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_validate_resize_config() */
/*************************************************************************/
/**************************** Private Functions: *************************/
/*************************************************************************/
/*-------------------------------------------------------------------------
*
* Function: H5C__auto_adjust_cache_size
*
* Purpose: Obtain the current full cache hit rate, and compare it
* with the hit rate thresholds for modifying cache size.
* If one of the thresholds has been crossed, adjusts the
* size of the cache accordingly.
*
* The function then resets the full cache hit rate
* statistics, and exits.
*
* Return: Non-negative on success/Negative on failure or if there was
* an attempt to flush a protected item.
*
*
* Programmer: John Mainzer, 10/7/04
*
* Modifications:
*
* JRM -- 11/18/04
* Major re-write to support ageout method of cache size
* reduction, and to adjust to changes in the
* H5C_auto_size_ctl_t structure.
*
* JRM -- 1/5/08
* Added support for flash cache size increases.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__auto_adjust_cache_size(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
hbool_t write_permitted,
hbool_t * first_flush_ptr)
{
H5C_t * cache_ptr = f->shared->cache;
herr_t result;
hbool_t inserted_epoch_marker = FALSE;
size_t new_max_cache_size = 0;
size_t old_max_cache_size = 0;
size_t new_min_clean_size = 0;
size_t old_min_clean_size = 0;
double hit_rate;
enum H5C_resize_status status = in_spec; /* will change if needed */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5C__auto_adjust_cache_size)
HDassert( f );
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->cache_accesses >=
(cache_ptr->resize_ctl).epoch_length );
HDassert( 0.0 <= (cache_ptr->resize_ctl).min_clean_fraction );
HDassert( (cache_ptr->resize_ctl).min_clean_fraction <= 100.0 );
if ( !cache_ptr->resize_enabled ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Auto cache resize disabled.")
}
HDassert( ( (cache_ptr->resize_ctl).incr_mode != H5C_incr__off ) || \
( (cache_ptr->resize_ctl).decr_mode != H5C_decr__off ) );
if ( H5C_get_cache_hit_rate(cache_ptr, &hit_rate) != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't get hit rate.")
}
HDassert( ( 0.0 <= hit_rate ) && ( hit_rate <= 1.0 ) );
switch ( (cache_ptr->resize_ctl).incr_mode )
{
case H5C_incr__off:
if ( cache_ptr->size_increase_possible ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"size_increase_possible but H5C_incr__off?!?!?")
}
break;
case H5C_incr__threshold:
if ( hit_rate < (cache_ptr->resize_ctl).lower_hr_threshold ) {
if ( ! cache_ptr->size_increase_possible ) {
status = increase_disabled;
} else if ( cache_ptr->max_cache_size >=
(cache_ptr->resize_ctl).max_size ) {
HDassert( cache_ptr->max_cache_size == \
(cache_ptr->resize_ctl).max_size );
status = at_max_size;
} else if ( ! cache_ptr->cache_full ) {
status = not_full;
} else {
new_max_cache_size = (size_t)
(((double)(cache_ptr->max_cache_size)) *
(cache_ptr->resize_ctl).increment);
/* clip to max size if necessary */
if ( new_max_cache_size >
(cache_ptr->resize_ctl).max_size ) {
new_max_cache_size = (cache_ptr->resize_ctl).max_size;
}
/* clip to max increment if necessary */
if ( ( (cache_ptr->resize_ctl).apply_max_increment ) &&
( (cache_ptr->max_cache_size +
(cache_ptr->resize_ctl).max_increment) <
new_max_cache_size ) ) {
new_max_cache_size = cache_ptr->max_cache_size +
(cache_ptr->resize_ctl).max_increment;
}
status = increase;
}
}
break;
default:
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unknown incr_mode.")
}
/* If the decr_mode is either age out or age out with threshold, we
* must run the marker maintenance code, whether we run the size
* reduction code or not. We do this in two places -- here we
* insert a new marker if the number of active epoch markers is
* is less than the the current epochs before eviction, and after
* the ageout call, we cycle the markers.
*
* However, we can't call the ageout code or cycle the markers
* unless there was a full complement of markers in place on
* entry. The inserted_epoch_marker flag is used to track this.
*/
if ( ( ( (cache_ptr->resize_ctl).decr_mode == H5C_decr__age_out )
||
( (cache_ptr->resize_ctl).decr_mode ==
H5C_decr__age_out_with_threshold
)
)
&&
( cache_ptr->epoch_markers_active <
(cache_ptr->resize_ctl).epochs_before_eviction
)
) {
result = H5C__autoadjust__ageout__insert_new_marker(cache_ptr);
if ( result != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"can't insert new epoch marker.")
} else {
inserted_epoch_marker = TRUE;
}
}
/* don't run the cache size decrease code unless the cache size
* increase code is disabled, or the size increase code sees no need
* for action. In either case, status == in_spec at this point.
*/
if ( status == in_spec ) {
switch ( (cache_ptr->resize_ctl).decr_mode )
{
case H5C_decr__off:
break;
case H5C_decr__threshold:
if ( hit_rate > (cache_ptr->resize_ctl).upper_hr_threshold ) {
if ( ! cache_ptr->size_decrease_possible ) {
status = decrease_disabled;
} else if ( cache_ptr->max_cache_size <=
(cache_ptr->resize_ctl).min_size ) {
HDassert( cache_ptr->max_cache_size ==
(cache_ptr->resize_ctl).min_size );
status = at_min_size;
} else {
new_max_cache_size = (size_t)
(((double)(cache_ptr->max_cache_size)) *
(cache_ptr->resize_ctl).decrement);
/* clip to min size if necessary */
if ( new_max_cache_size <
(cache_ptr->resize_ctl).min_size ) {
new_max_cache_size =
(cache_ptr->resize_ctl).min_size;
}
/* clip to max decrement if necessary */
if ( ( (cache_ptr->resize_ctl).apply_max_decrement ) &&
( ((cache_ptr->resize_ctl).max_decrement +
new_max_cache_size) <
cache_ptr->max_cache_size ) ) {
new_max_cache_size = cache_ptr->max_cache_size -
(cache_ptr->resize_ctl).max_decrement;
}
status = decrease;
}
}
break;
case H5C_decr__age_out_with_threshold:
case H5C_decr__age_out:
if ( ! inserted_epoch_marker ) {
if ( ! cache_ptr->size_decrease_possible ) {
status = decrease_disabled;
} else {
result = H5C__autoadjust__ageout(f,
hit_rate,
&status,
&new_max_cache_size,
primary_dxpl_id,
secondary_dxpl_id,
write_permitted,
first_flush_ptr);
if ( result != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"ageout code failed.")
}
}
}
break;
default:
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unknown incr_mode.")
}
}
/* cycle the epoch markers here if appropriate */
if ( ( ( (cache_ptr->resize_ctl).decr_mode == H5C_decr__age_out )
||
( (cache_ptr->resize_ctl).decr_mode ==
H5C_decr__age_out_with_threshold
)
)
&&
( ! inserted_epoch_marker )
) {
/* move last epoch marker to the head of the LRU list */
result = H5C__autoadjust__ageout__cycle_epoch_marker(cache_ptr);
if ( result != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"error cycling epoch marker.")
}
}
if ( ( status == increase ) || ( status == decrease ) ) {
old_max_cache_size = cache_ptr->max_cache_size;
old_min_clean_size = cache_ptr->min_clean_size;
new_min_clean_size = (size_t)
((double)new_max_cache_size *
((cache_ptr->resize_ctl).min_clean_fraction));
/* new_min_clean_size is of size_t, and thus must be non-negative.
* Hence we have
*
* ( 0 <= new_min_clean_size ).
*
* by definition.
*/
HDassert( new_min_clean_size <= new_max_cache_size );
HDassert( (cache_ptr->resize_ctl).min_size <= new_max_cache_size );
HDassert( new_max_cache_size <= (cache_ptr->resize_ctl).max_size );
cache_ptr->max_cache_size = new_max_cache_size;
cache_ptr->min_clean_size = new_min_clean_size;
if ( status == increase ) {
cache_ptr->cache_full = FALSE;
} else if ( status == decrease ) {
cache_ptr->size_decreased = TRUE;
}
/* update flash cache size increase fields as appropriate */
if ( cache_ptr->flash_size_increase_possible ) {
switch ( (cache_ptr->resize_ctl).flash_incr_mode )
{
case H5C_flash_incr__off:
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"flash_size_increase_possible but H5C_flash_incr__off?!")
break;
case H5C_flash_incr__add_space:
cache_ptr->flash_size_increase_threshold =
(size_t)
(((double)(cache_ptr->max_cache_size)) *
((cache_ptr->resize_ctl).flash_threshold));
break;
default: /* should be unreachable */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Unknown flash_incr_mode?!?!?.")
break;
}
}
}
if ( (cache_ptr->resize_ctl).rpt_fcn != NULL ) {
(*((cache_ptr->resize_ctl).rpt_fcn))
(cache_ptr,
H5C__CURR_AUTO_RESIZE_RPT_FCN_VER,
hit_rate,
status,
old_max_cache_size,
new_max_cache_size,
old_min_clean_size,
new_min_clean_size);
}
if ( H5C_reset_cache_hit_rate_stats(cache_ptr) != SUCCEED ) {
/* this should be impossible... */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"H5C_reset_cache_hit_rate_stats failed.")
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__auto_adjust_cache_size() */
/*-------------------------------------------------------------------------
*
* Function: H5C__autoadjust__ageout
*
* Purpose: Implement the ageout automatic cache size decrement
* algorithm. Note that while this code evicts aged out
* entries, the code does not change the maximum cache size.
* Instead, the function simply computes the new value (if
* any change is indicated) and reports this value in
* *new_max_cache_size_ptr.
*
* Return: Non-negative on success/Negative on failure or if there was
* an attempt to flush a protected item.
*
*
* Programmer: John Mainzer, 11/18/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__autoadjust__ageout(H5F_t * f,
double hit_rate,
enum H5C_resize_status * status_ptr,
size_t * new_max_cache_size_ptr,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
hbool_t write_permitted,
hbool_t * first_flush_ptr)
{
H5C_t * cache_ptr = f->shared->cache;
herr_t result;
size_t test_size;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5C__autoadjust__ageout)
HDassert( f );
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( ( status_ptr ) && ( *status_ptr == in_spec ) );
HDassert( ( new_max_cache_size_ptr ) && ( *new_max_cache_size_ptr == 0 ) );
/* remove excess epoch markers if any */
if ( cache_ptr->epoch_markers_active >
(cache_ptr->resize_ctl).epochs_before_eviction ) {
result = H5C__autoadjust__ageout__remove_excess_markers(cache_ptr);
if ( result != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"can't remove excess epoch markers.")
}
}
if ( ( (cache_ptr->resize_ctl).decr_mode == H5C_decr__age_out )
||
( ( (cache_ptr->resize_ctl).decr_mode ==
H5C_decr__age_out_with_threshold
)
&&
( hit_rate >= (cache_ptr->resize_ctl).upper_hr_threshold )
)
) {
if ( cache_ptr->max_cache_size > (cache_ptr->resize_ctl).min_size ){
/* evict aged out cache entries if appropriate... */
if(H5C__autoadjust__ageout__evict_aged_out_entries(f, primary_dxpl_id,
secondary_dxpl_id, write_permitted, first_flush_ptr) < 0)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "error flushing aged out entries.")
/* ... and then reduce cache size if appropriate */
if ( cache_ptr->index_size < cache_ptr->max_cache_size ) {
if ( (cache_ptr->resize_ctl).apply_empty_reserve ) {
test_size = (size_t)(((double)cache_ptr->index_size) /
(1 - (cache_ptr->resize_ctl).empty_reserve));
if ( test_size < cache_ptr->max_cache_size ) {
*status_ptr = decrease;
*new_max_cache_size_ptr = test_size;
}
} else {
*status_ptr = decrease;
*new_max_cache_size_ptr = cache_ptr->index_size;
}
if ( *status_ptr == decrease ) {
/* clip to min size if necessary */
if ( *new_max_cache_size_ptr <
(cache_ptr->resize_ctl).min_size ) {
*new_max_cache_size_ptr =
(cache_ptr->resize_ctl).min_size;
}
/* clip to max decrement if necessary */
if ( ( (cache_ptr->resize_ctl).apply_max_decrement ) &&
( ((cache_ptr->resize_ctl).max_decrement +
*new_max_cache_size_ptr) <
cache_ptr->max_cache_size ) ) {
*new_max_cache_size_ptr = cache_ptr->max_cache_size -
(cache_ptr->resize_ctl).max_decrement;
}
}
}
} else {
*status_ptr = at_min_size;
}
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__autoadjust__ageout() */
/*-------------------------------------------------------------------------
*
* Function: H5C__autoadjust__ageout__cycle_epoch_marker
*
* Purpose: Remove the oldest epoch marker from the LRU list,
* and reinsert it at the head of the LRU list. Also
* remove the epoch marker's index from the head of the
* ring buffer, and re-insert it at the tail of the ring
* buffer.
*
* Return: SUCCEED on success/FAIL on failure.
*
* Programmer: John Mainzer, 11/22/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__autoadjust__ageout__cycle_epoch_marker(H5C_t * cache_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
int i;
FUNC_ENTER_NOAPI_NOINIT(H5C__autoadjust__ageout__cycle_epoch_marker)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
if ( cache_ptr->epoch_markers_active <= 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"No active epoch markers on entry?!?!?.")
}
/* remove the last marker from both the ring buffer and the LRU list */
i = cache_ptr->epoch_marker_ringbuf[cache_ptr->epoch_marker_ringbuf_first];
cache_ptr->epoch_marker_ringbuf_first =
(cache_ptr->epoch_marker_ringbuf_first + 1) %
(H5C__MAX_EPOCH_MARKERS + 1);
cache_ptr->epoch_marker_ringbuf_size -= 1;
if ( cache_ptr->epoch_marker_ringbuf_size < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "ring buffer underflow.")
}
if ( (cache_ptr->epoch_marker_active)[i] != TRUE ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unused marker in LRU?!?")
}
H5C__DLL_REMOVE((&((cache_ptr->epoch_markers)[i])), \
(cache_ptr)->LRU_head_ptr, \
(cache_ptr)->LRU_tail_ptr, \
(cache_ptr)->LRU_list_len, \
(cache_ptr)->LRU_list_size, \
(FAIL))
/* now, re-insert it at the head of the LRU list, and at the tail of
* the ring buffer.
*/
HDassert( ((cache_ptr->epoch_markers)[i]).addr == (haddr_t)i );
HDassert( ((cache_ptr->epoch_markers)[i]).next == NULL );
HDassert( ((cache_ptr->epoch_markers)[i]).prev == NULL );
cache_ptr->epoch_marker_ringbuf_last =
(cache_ptr->epoch_marker_ringbuf_last + 1) %
(H5C__MAX_EPOCH_MARKERS + 1);
(cache_ptr->epoch_marker_ringbuf)[cache_ptr->epoch_marker_ringbuf_last] = i;
cache_ptr->epoch_marker_ringbuf_size += 1;
if ( cache_ptr->epoch_marker_ringbuf_size > H5C__MAX_EPOCH_MARKERS ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "ring buffer overflow.")
}
H5C__DLL_PREPEND((&((cache_ptr->epoch_markers)[i])), \
(cache_ptr)->LRU_head_ptr, \
(cache_ptr)->LRU_tail_ptr, \
(cache_ptr)->LRU_list_len, \
(cache_ptr)->LRU_list_size, \
(FAIL))
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__autoadjust__ageout__cycle_epoch_marker() */
/*-------------------------------------------------------------------------
*
* Function: H5C__autoadjust__ageout__evict_aged_out_entries
*
* Purpose: Evict clean entries in the cache that haven't
* been accessed for at least
* (cache_ptr->resize_ctl).epochs_before_eviction epochs,
* and flush dirty entries that haven't been accessed for
* that amount of time.
*
* Depending on configuration, the function will either
* flush or evict all such entries, or all such entries it
* encounters until it has freed the maximum amount of space
* allowed under the maximum decrement.
*
* If we are running in parallel mode, writes may not be
* permitted. If so, the function simply skips any dirty
* entries it may encounter.
*
* The function makes no attempt to maintain the minimum
* clean size, as there is no guarantee that the cache size
* will be changed.
*
* If there is no cache size change, the minimum clean size
* constraint will be met through a combination of clean
* entries and free space in the cache.
*
* If there is a cache size reduction, the minimum clean size
* will be re-calculated, and will be enforced the next time
* we have to make space in the cache.
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used depending on the value of
* *first_flush_ptr. The idea is to use the primary_dxpl_id
* on the first write in a sequence of writes, and to use
* the secondary_dxpl_id on all subsequent writes.
*
* This is useful in the metadata cache, but may not be
* needed elsewhere. If so, just use the same dxpl_id for
* both parameters.
*
* Observe that this function cannot occasion a read.
*
* Return: Non-negative on success/Negative on failure.
*
* Programmer: John Mainzer, 11/22/04
*
* Modifications:
*
* JRM -- 10/13/07
* Added code to detect and manage the case in which a
* flush callback changes the LRU-list out from under
* the function. The only way I can think of in which this
* can happen is if a flush function loads an entry
* into the cache that isn't there already. Quincey tells
* me that this will never happen, but I'm not sure I
* believe him.
*
* Note that this is a pretty bad scenario if it ever
* happens. The code I have added should allow us to
* handle the situation under all but the worst conditions,
* but one can argue that I should just scream and die if I
* ever detect the condidtion.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__autoadjust__ageout__evict_aged_out_entries(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
hbool_t write_permitted,
hbool_t * first_flush_ptr)
{
H5C_t * cache_ptr = f->shared->cache;
herr_t result;
size_t eviction_size_limit;
size_t bytes_evicted = 0;
hbool_t prev_is_dirty = FALSE;
H5C_cache_entry_t * entry_ptr;
H5C_cache_entry_t * next_ptr;
H5C_cache_entry_t * prev_ptr;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5C__autoadjust__ageout__evict_aged_out_entries)
HDassert( f );
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
/* if there is a limit on the amount that the cache size can be decrease
* in any one round of the cache size reduction algorithm, load that
* limit into eviction_size_limit. Otherwise, set eviction_size_limit
* to the equivalent of infinity. The current size of the index will
* do nicely.
*/
if ( (cache_ptr->resize_ctl).apply_max_decrement ) {
eviction_size_limit = (cache_ptr->resize_ctl).max_decrement;
} else {
eviction_size_limit = cache_ptr->index_size; /* i.e. infinity */
}
if ( write_permitted ) {
entry_ptr = cache_ptr->LRU_tail_ptr;
while ( ( entry_ptr != NULL ) &&
( (entry_ptr->type)->id != H5C__EPOCH_MARKER_TYPE ) &&
( bytes_evicted < eviction_size_limit ) )
{
HDassert( ! (entry_ptr->is_protected) );
next_ptr = entry_ptr->next;
prev_ptr = entry_ptr->prev;
if ( prev_ptr != NULL ) {
prev_is_dirty = prev_ptr->is_dirty;
}
if ( entry_ptr->is_dirty ) {
result = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
entry_ptr->addr,
H5C__NO_FLAGS_SET,
first_flush_ptr,
FALSE);
} else {
bytes_evicted += entry_ptr->size;
result = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
entry_ptr->addr,
H5C__FLUSH_INVALIDATE_FLAG,
first_flush_ptr,
TRUE);
}
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"unable to flush entry")
}
if ( prev_ptr != NULL ) {
#ifndef NDEBUG
if ( prev_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) {
/* something horrible has happened to *prev_ptr --
* scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"*prev_ptr corrupt")
} else
#endif /* NDEBUG */
if ( ( prev_ptr->is_dirty != prev_is_dirty )
||
( prev_ptr->next != next_ptr )
||
( prev_ptr->is_protected )
||
( prev_ptr->is_pinned ) ) {
/* something has happened to the LRU -- start over
* from the tail.
*/
entry_ptr = cache_ptr->LRU_tail_ptr;
} else {
entry_ptr = prev_ptr;
}
} else {
entry_ptr = NULL;
}
} /* end while */
/* for now at least, don't bother to maintain the minimum clean size,
* as the cache should now be less than its maximum size. Due to
* the vaguries of the cache size reduction algorthim, we may not
* reduce the size of the cache.
*
* If we do, we will calculate a new minimum clean size, which will
* be enforced the next time we try to make space in the cache.
*
* If we don't, no action is necessary, as we have just evicted and/or
* or flushed a bunch of entries and therefore the sum of the clean
* and free space in the cache must be greater than or equal to the
* min clean space requirement (assuming that requirement was met on
* entry).
*/
} else /* ! write_permitted */ {
/* since we are not allowed to write, all we can do is evict
* any clean entries that we may encounter before we either
* hit the eviction size limit, or encounter the epoch marker.
*
* If we are operating read only, this isn't an issue, as there
* will not be any dirty entries.
*
* If we are operating in R/W mode, all the dirty entries we
* skip will be flushed the next time we attempt to make space
* when writes are permitted. This may have some local
* performance implications, but it shouldn't cause any net
* slowdown.
*/
HDassert( H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS );
entry_ptr = cache_ptr->LRU_tail_ptr;
while ( ( entry_ptr != NULL ) &&
( (entry_ptr->type)->id != H5C__EPOCH_MARKER_TYPE ) &&
( bytes_evicted < eviction_size_limit ) )
{
HDassert( ! (entry_ptr->is_protected) );
prev_ptr = entry_ptr->prev;
if ( ! (entry_ptr->is_dirty) ) {
result = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
entry_ptr->addr,
H5C__FLUSH_INVALIDATE_FLAG,
first_flush_ptr,
TRUE);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"unable to flush clean entry")
}
}
/* just skip the entry if it is dirty, as we can't do
* anything with it now since we can't write.
*/
entry_ptr = prev_ptr;
} /* end while */
}
if ( cache_ptr->index_size < cache_ptr->max_cache_size ) {
cache_ptr->cache_full = FALSE;
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__autoadjust__ageout__evict_aged_out_entries() */
/*-------------------------------------------------------------------------
*
* Function: H5C__autoadjust__ageout__insert_new_marker
*
* Purpose: Find an unused marker cache entry, mark it as used, and
* insert it at the head of the LRU list. Also add the
* marker's index in the epoch_markers array.
*
* Return: SUCCEED on success/FAIL on failure.
*
* Programmer: John Mainzer, 11/19/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__autoadjust__ageout__insert_new_marker(H5C_t * cache_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
int i;
FUNC_ENTER_NOAPI_NOINIT(H5C__autoadjust__ageout__insert_new_marker)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
if ( cache_ptr->epoch_markers_active >=
(cache_ptr->resize_ctl).epochs_before_eviction ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Already have a full complement of markers.")
}
/* find an unused marker */
i = 0;
while ( ( (cache_ptr->epoch_marker_active)[i] ) &&
( i < H5C__MAX_EPOCH_MARKERS ) )
{
i++;
}
if(i >= H5C__MAX_EPOCH_MARKERS)
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't find unused marker.")
HDassert( ((cache_ptr->epoch_markers)[i]).addr == (haddr_t)i );
HDassert( ((cache_ptr->epoch_markers)[i]).next == NULL );
HDassert( ((cache_ptr->epoch_markers)[i]).prev == NULL );
(cache_ptr->epoch_marker_active)[i] = TRUE;
cache_ptr->epoch_marker_ringbuf_last =
(cache_ptr->epoch_marker_ringbuf_last + 1) %
(H5C__MAX_EPOCH_MARKERS + 1);
(cache_ptr->epoch_marker_ringbuf)[cache_ptr->epoch_marker_ringbuf_last] = i;
cache_ptr->epoch_marker_ringbuf_size += 1;
if ( cache_ptr->epoch_marker_ringbuf_size > H5C__MAX_EPOCH_MARKERS ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "ring buffer overflow.")
}
H5C__DLL_PREPEND((&((cache_ptr->epoch_markers)[i])), \
(cache_ptr)->LRU_head_ptr, \
(cache_ptr)->LRU_tail_ptr, \
(cache_ptr)->LRU_list_len, \
(cache_ptr)->LRU_list_size, \
(FAIL))
cache_ptr->epoch_markers_active += 1;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__autoadjust__ageout__insert_new_marker() */
/*-------------------------------------------------------------------------
*
* Function: H5C__autoadjust__ageout__remove_all_markers
*
* Purpose: Remove all epoch markers from the LRU list and mark them
* as inactive.
*
* Return: SUCCEED on success/FAIL on failure.
*
* Programmer: John Mainzer, 11/22/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__autoadjust__ageout__remove_all_markers(H5C_t * cache_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
int i;
int ring_buf_index;
FUNC_ENTER_NOAPI_NOINIT(H5C__autoadjust__ageout__remove_all_markers)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
while ( cache_ptr->epoch_markers_active > 0 )
{
/* get the index of the last epoch marker in the LRU list
* and remove it from the ring buffer.
*/
ring_buf_index = cache_ptr->epoch_marker_ringbuf_first;
i = (cache_ptr->epoch_marker_ringbuf)[ring_buf_index];
cache_ptr->epoch_marker_ringbuf_first =
(cache_ptr->epoch_marker_ringbuf_first + 1) %
(H5C__MAX_EPOCH_MARKERS + 1);
cache_ptr->epoch_marker_ringbuf_size -= 1;
if ( cache_ptr->epoch_marker_ringbuf_size < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "ring buffer underflow.")
}
if ( (cache_ptr->epoch_marker_active)[i] != TRUE ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unused marker in LRU?!?")
}
/* remove the epoch marker from the LRU list */
H5C__DLL_REMOVE((&((cache_ptr->epoch_markers)[i])), \
(cache_ptr)->LRU_head_ptr, \
(cache_ptr)->LRU_tail_ptr, \
(cache_ptr)->LRU_list_len, \
(cache_ptr)->LRU_list_size, \
(FAIL))
/* mark the epoch marker as unused. */
(cache_ptr->epoch_marker_active)[i] = FALSE;
HDassert( ((cache_ptr->epoch_markers)[i]).addr == (haddr_t)i );
HDassert( ((cache_ptr->epoch_markers)[i]).next == NULL );
HDassert( ((cache_ptr->epoch_markers)[i]).prev == NULL );
/* decrement the number of active epoch markers */
cache_ptr->epoch_markers_active -= 1;
HDassert( cache_ptr->epoch_markers_active == \
cache_ptr->epoch_marker_ringbuf_size );
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__autoadjust__ageout__remove_all_markers() */
/*-------------------------------------------------------------------------
*
* Function: H5C__autoadjust__ageout__remove_excess_markers
*
* Purpose: Remove epoch markers from the end of the LRU list and
* mark them as inactive until the number of active markers
* equals the the current value of
* (cache_ptr->resize_ctl).epochs_before_eviction.
*
* Return: SUCCEED on success/FAIL on failure.
*
* Programmer: John Mainzer, 11/19/04
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__autoadjust__ageout__remove_excess_markers(H5C_t * cache_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
int i;
int ring_buf_index;
FUNC_ENTER_NOAPI_NOINIT(H5C__autoadjust__ageout__remove_excess_markers)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
if ( cache_ptr->epoch_markers_active <=
(cache_ptr->resize_ctl).epochs_before_eviction ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "no excess markers on entry.")
}
while ( cache_ptr->epoch_markers_active >
(cache_ptr->resize_ctl).epochs_before_eviction )
{
/* get the index of the last epoch marker in the LRU list
* and remove it from the ring buffer.
*/
ring_buf_index = cache_ptr->epoch_marker_ringbuf_first;
i = (cache_ptr->epoch_marker_ringbuf)[ring_buf_index];
cache_ptr->epoch_marker_ringbuf_first =
(cache_ptr->epoch_marker_ringbuf_first + 1) %
(H5C__MAX_EPOCH_MARKERS + 1);
cache_ptr->epoch_marker_ringbuf_size -= 1;
if ( cache_ptr->epoch_marker_ringbuf_size < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "ring buffer underflow.")
}
if ( (cache_ptr->epoch_marker_active)[i] != TRUE ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unused marker in LRU?!?")
}
/* remove the epoch marker from the LRU list */
H5C__DLL_REMOVE((&((cache_ptr->epoch_markers)[i])), \
(cache_ptr)->LRU_head_ptr, \
(cache_ptr)->LRU_tail_ptr, \
(cache_ptr)->LRU_list_len, \
(cache_ptr)->LRU_list_size, \
(FAIL))
/* mark the epoch marker as unused. */
(cache_ptr->epoch_marker_active)[i] = FALSE;
HDassert( ((cache_ptr->epoch_markers)[i]).addr == (haddr_t)i );
HDassert( ((cache_ptr->epoch_markers)[i]).next == NULL );
HDassert( ((cache_ptr->epoch_markers)[i]).prev == NULL );
/* decrement the number of active epoch markers */
cache_ptr->epoch_markers_active -= 1;
HDassert( cache_ptr->epoch_markers_active == \
cache_ptr->epoch_marker_ringbuf_size );
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__autoadjust__ageout__remove_excess_markers() */
/*-------------------------------------------------------------------------
*
* Function: H5C__flash_increase_cache_size
*
* Purpose: If there is not at least new_entry_size - old_entry_size
* bytes of free space in the cache and the current
* max_cache_size is less than (cache_ptr->resize_ctl).max_size,
* perform a flash increase in the cache size and then reset
* the full cache hit rate statistics, and exit.
*
* Return: Non-negative on success/Negative on failure.
*
* Programmer: John Mainzer, 12/31/07
*
* Modifications:
*
* None.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C__flash_increase_cache_size(H5C_t * cache_ptr,
size_t old_entry_size,
size_t new_entry_size)
{
size_t new_max_cache_size = 0;
size_t old_max_cache_size = 0;
size_t new_min_clean_size = 0;
size_t old_min_clean_size = 0;
size_t space_needed;
enum H5C_resize_status status = flash_increase; /* may change */
double hit_rate;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5C__flash_increase_cache_size)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->flash_size_increase_possible );
HDassert( new_entry_size > cache_ptr->flash_size_increase_threshold );
HDassert( old_entry_size < new_entry_size );
if ( old_entry_size >= new_entry_size ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"old_entry_size >= new_entry_size")
}
space_needed = new_entry_size - old_entry_size;
if ( ( (cache_ptr->index_size + space_needed) >
cache_ptr->max_cache_size ) &&
( cache_ptr->max_cache_size < (cache_ptr->resize_ctl).max_size ) ) {
/* we have work to do */
switch ( (cache_ptr->resize_ctl).flash_incr_mode )
{
case H5C_flash_incr__off:
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"flash_size_increase_possible but H5C_flash_incr__off?!")
break;
case H5C_flash_incr__add_space:
if ( cache_ptr->index_size < cache_ptr->max_cache_size ) {
HDassert( (cache_ptr->max_cache_size - cache_ptr->index_size)
< space_needed );
space_needed -= cache_ptr->max_cache_size -
cache_ptr->index_size;
}
space_needed =
(size_t)(((double)space_needed) *
(cache_ptr->resize_ctl).flash_multiple);
new_max_cache_size = cache_ptr->max_cache_size + space_needed;
break;
default: /* should be unreachable */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Unknown flash_incr_mode?!?!?.")
break;
}
if ( new_max_cache_size > (cache_ptr->resize_ctl).max_size ) {
new_max_cache_size = (cache_ptr->resize_ctl).max_size;
}
HDassert( new_max_cache_size > cache_ptr->max_cache_size );
new_min_clean_size = (size_t)
((double)new_max_cache_size *
((cache_ptr->resize_ctl).min_clean_fraction));
HDassert( new_min_clean_size <= new_max_cache_size );
old_max_cache_size = cache_ptr->max_cache_size;
old_min_clean_size = cache_ptr->min_clean_size;
cache_ptr->max_cache_size = new_max_cache_size;
cache_ptr->min_clean_size = new_min_clean_size;
/* update flash cache size increase fields as appropriate */
HDassert ( cache_ptr->flash_size_increase_possible );
switch ( (cache_ptr->resize_ctl).flash_incr_mode )
{
case H5C_flash_incr__off:
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"flash_size_increase_possible but H5C_flash_incr__off?!")
break;
case H5C_flash_incr__add_space:
cache_ptr->flash_size_increase_threshold =
(size_t)
(((double)(cache_ptr->max_cache_size)) *
((cache_ptr->resize_ctl).flash_threshold));
break;
default: /* should be unreachable */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Unknown flash_incr_mode?!?!?.")
break;
}
/* note that we don't cycle the epoch markers. We can
* argue either way as to whether we should, but for now
* we don't.
*/
if ( (cache_ptr->resize_ctl).rpt_fcn != NULL ) {
/* get the hit rate for the reporting function. Should still
* be good as we havent reset the hit rate statistics.
*/
if ( H5C_get_cache_hit_rate(cache_ptr, &hit_rate) != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Can't get hit rate.")
}
(*((cache_ptr->resize_ctl).rpt_fcn))
(cache_ptr,
H5C__CURR_AUTO_RESIZE_RPT_FCN_VER,
hit_rate,
status,
old_max_cache_size,
new_max_cache_size,
old_min_clean_size,
new_min_clean_size);
}
if ( H5C_reset_cache_hit_rate_stats(cache_ptr) != SUCCEED ) {
/* this should be impossible... */
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"H5C_reset_cache_hit_rate_stats failed.")
}
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__flash_increase_cache_size() */
/*-------------------------------------------------------------------------
* Function: H5C_flush_invalidate_cache
*
* Purpose: Flush and destroy the entries contained in the target
* cache.
*
* If the cache contains protected entries, the function will
* fail, as protected entries cannot be either flushed or
* destroyed. However all unprotected entries should be
* flushed and destroyed before the function returns failure.
*
* While pinned entries can usually be flushed, they cannot
* be destroyed. However, they should be unpinned when all
* the entries that reference them have been destroyed (thus
* reduding the pinned entry's reference count to 0, allowing
* it to be unpinned).
*
* If pinned entries are present, the function makes repeated
* passes through the cache, flushing all dirty entries
* (including the pinned dirty entries where permitted) and
* destroying all unpinned entries. This process is repeated
* until either the cache is empty, or the number of pinned
* entries stops decreasing on each pass.
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used on the first write occasioned
* by the flush (primary_dxpl_id), and on all subsequent
* writes (secondary_dxpl_id).
*
* Return: Non-negative on success/Negative on failure or if there was
* a request to flush all items and something was protected.
*
* Programmer: John Mainzer
* 3/24/065
*
* Modifications:
*
* To support the fractal heap, the cache must now deal with
* entries being dirtied, resized, and/or moved inside
* flush callbacks. Updated function to support this.
*
* -- JRM 8/27/06
*
* Added code to detect and manage the case in which a
* flush callback changes the s-list out from under
* the function. The only way I can think of in which this
* can happen is if a flush function loads an entry
* into the cache that isn't there already. Quincey tells
* me that this will never happen, but I'm not sure I
* believe him.
*
* Note that this is a pretty bad scenario if it ever
* happens. The code I have added should allow us to
* handle the situation under all but the worst conditions,
* but one can argue that I should just scream and die if I
* ever detect the condidtion.
*
* -- JRM 10/13/07
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C_flush_invalidate_cache(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
unsigned flags)
{
H5C_t * cache_ptr = f->shared->cache;
herr_t status;
hbool_t first_flush = TRUE;
int32_t protected_entries = 0;
int32_t i;
int32_t cur_pel_len;
int32_t old_pel_len;
int32_t passes = 0;
unsigned cooked_flags;
H5SL_node_t * node_ptr = NULL;
H5C_cache_entry_t * entry_ptr = NULL;
H5C_cache_entry_t * next_entry_ptr = NULL;
#if H5C_DO_SANITY_CHECKS
int64_t actual_slist_len = 0;
int64_t initial_slist_len = 0;
size_t actual_slist_size = 0;
size_t initial_slist_size = 0;
#endif /* H5C_DO_SANITY_CHECKS */
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI(H5C_flush_invalidate_cache, FAIL)
HDassert( f );
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f );
HDassert( cache_ptr->slist_ptr );
/* Filter out the flags that are not relevant to the flush/invalidate.
* At present, only the H5C__FLUSH_CLEAR_ONLY_FLAG is kept.
*/
cooked_flags = flags & H5C__FLUSH_CLEAR_ONLY_FLAG;
/* remove ageout markers if present */
if ( cache_ptr->epoch_markers_active > 0 ) {
status = H5C__autoadjust__ageout__remove_all_markers(cache_ptr);
if ( status != SUCCEED ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"error removing all epoch markers.")
}
}
/* The flush proceedure here is a bit strange.
*
* In the outer while loop we make at least one pass through the
* cache, and then repeat until either all the pinned entries
* unpin themselves, or until the number of pinned entries stops
* declining. In this later case, we scream and die.
*
* Since the fractal heap can dirty, resize, and/or move entries
* in is flush callback, it is possible that the cache will still
* contain dirty entries at this point. If so, we must make up to
* H5C__MAX_PASSES_ON_FLUSH more passes through the skip list
* to allow it to empty. If is is not empty at this point, we again
* scream and die.
*
* Further, since clean entries can be dirtied, resized, and/or moved
* as the result of a flush call back (either the entries own, or that
* for some other cache entry), we can no longer promise to flush
* the cache entries in increasing address order.
*
* Instead, we just do the best we can -- making a pass through
* the skip list, and then a pass through the "clean" entries, and
* then repeating as needed. Thus it is quite possible that an
* entry will be evicted from the cache only to be re-loaded later
* in the flush process (From what Quincey tells me, the pin
* mechanism makes this impossible, but even it it is true now,
* we shouldn't count on it in the future.)
*
* The bottom line is that entries will probably be flushed in close
* to increasing address order, but there are no guarantees.
*/
cur_pel_len = cache_ptr->pel_len;
old_pel_len = cache_ptr->pel_len;
while ( cache_ptr->index_len > 0 )
{
/* first, try to flush-destroy any dirty entries. Do this by
* making a scan through the slist. Note that new dirty entries
* may be created by the flush call backs. Thus it is possible
* that the slist will not be empty after we finish the scan.
*/
if ( cache_ptr->slist_len == 0 ) {
node_ptr = NULL;
HDassert( cache_ptr->slist_size == 0 );
} else {
node_ptr = H5SL_first(cache_ptr->slist_ptr);
if ( node_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"slist_len != 0 && node_ptr == NULL");
}
next_entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr);
if ( next_entry_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"next_entry_ptr == NULL 1 ?!?!");
}
#ifndef NDEBUG
HDassert( next_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC );
#endif /* NDEBUG */
HDassert( next_entry_ptr->is_dirty );
HDassert( next_entry_ptr->in_slist );
}
#if H5C_DO_SANITY_CHECKS
/* Depending on circumstances, H5C_flush_single_entry() will
* remove dirty entries from the slist as it flushes them.
* Thus for sanity checks we must make note of the initial
* slist length and size before we do any flushes.
*/
initial_slist_len = cache_ptr->slist_len;
initial_slist_size = cache_ptr->slist_size;
/* There is also the possibility that entries will be
* dirtied, resized, and/or moved as the result of
* calls to the flush callbacks. We use the slist_len_increase
* and slist_size_increase increase fields in struct H5C_t
* to track these changes for purpose of sanity checking.
* To this end, we must zero these fields before we start
* the pass through the slist.
*/
cache_ptr->slist_len_increase = 0;
cache_ptr->slist_size_increase = 0;
/* Finally, reset the actual_slist_len and actual_slist_size
* fields to zero, as these fields are used to accumulate
* the slist lenght and size that we see as we scan through
* the slist.
*/
actual_slist_len = 0;
actual_slist_size = 0;
#endif /* H5C_DO_SANITY_CHECKS */
while ( node_ptr != NULL )
{
entry_ptr = next_entry_ptr;
/* With the advent of the fractal heap, it is possible
* that the flush callback will dirty and/or resize
* other entries in the cache. In particular, while
* Quincey has promised me that this will never happen,
* it is possible that the flush callback for an
* entry may protect an entry that is not in the cache,
* perhaps causing the cache to flush and possibly
* evict the entry associated with node_ptr to make
* space for the new entry.
*
* Thus we do a bit of extra sanity checking on entry_ptr,
* and break out of this scan of the skip list if we
* detect major problems. We have a bit of leaway on the
* number of passes though the skip list, so this shouldn't
* be an issue in the flush in and of itself, as it should
* be all but impossible for this to happen more than once
* in any flush.
*
* Observe that that breaking out of the scan early
* shouldn't break the sanity checks just after the end
* of this while loop.
*
* If an entry has merely been marked clean and removed from
* the s-list, we simply break out of the scan.
*
* If the entry has been evicted, we flag an error and
* exit.
*/
#ifndef NDEBUG
if ( entry_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"entry_ptr->magic is invalid ?!?!");
} else
#endif /* NDEBUG */
if ( ( ! entry_ptr->is_dirty ) ||
( ! entry_ptr->in_slist ) ) {
/* the s-list has been modified out from under us.
* break out of the loop.
*/
break;
}
/* increment node pointer now, before we delete its target
* from the slist.
*/
node_ptr = H5SL_next(node_ptr);
if ( node_ptr != NULL ) {
next_entry_ptr = (H5C_cache_entry_t *)H5SL_item(node_ptr);
if ( next_entry_ptr == NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"next_entry_ptr == NULL 2 ?!?!");
}
#ifndef NDEBUG
HDassert( next_entry_ptr->magic ==
H5C__H5C_CACHE_ENTRY_T_MAGIC );
#endif /* NDEBUG */
HDassert( next_entry_ptr->is_dirty );
HDassert( next_entry_ptr->in_slist );
} else {
next_entry_ptr = NULL;
}
/* Note that we now remove nodes from the slist as we flush
* the associated entries, instead of leaving them there
* until we are done, and then destroying all nodes in
* the slist.
*
* While this optimization used to be easy, with the possibility
* of new entries being added to the slist in the midst of the
* flush, we must keep the slist in cannonical form at all
* times.
*/
HDassert( entry_ptr != NULL );
HDassert( entry_ptr->in_slist );
#if H5C_DO_SANITY_CHECKS
/* update actual_slist_len & actual_slist_size before
* the flush. Note that the entry will be removed
* from the slist after the flush, and thus may be
* resized by the flush callback. This is OK, as
* we will catch the size delta in
* cache_ptr->slist_size_increase.
*
* Note that we include pinned entries in this count, even
* though we will not actually flush them.
*/
actual_slist_len++;
actual_slist_size += entry_ptr->size;
#endif /* H5C_DO_SANITY_CHECKS */
if ( entry_ptr->is_protected ) {
/* we have major problems -- but lets flush
* everything we can before we flag an error.
*/
protected_entries++;
} else if ( entry_ptr->is_pinned ) {
/* Test to see if we are can flush the entry now.
* If we can, go ahead and flush, but don't tell
* H5C_flush_single_entry() to destroy the entry
* as pinned entries can't be evicted.
*/
if ( TRUE ) { /* When we get to multithreaded cache,
* we will need either locking code, and/or
* a test to see if the entry is in flushable
* condition here.
*/
status = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
NULL,
entry_ptr->addr,
H5C__NO_FLAGS_SET,
&first_flush,
FALSE);
if ( status < 0 ) {
/* This shouldn't happen -- if it does, we are toast
* so just scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"dirty pinned entry flush failed.")
}
}
} else {
status = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
NULL,
entry_ptr->addr,
(cooked_flags | H5C__FLUSH_INVALIDATE_FLAG),
&first_flush,
TRUE);
if ( status < 0 ) {
/* This shouldn't happen -- if it does, we are toast so
* just scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"dirty entry flush destroy failed.")
}
}
} /* end while loop scanning skip list */
#if H5C_DO_SANITY_CHECKS
/* It is possible that entries were added to the slist during
* the scan, either before or after scan pointer. The following
* asserts take this into account.
*
* Don't bother with the sanity checks if node_ptr != NULL, as
* in this case we broke out of the loop because it got changed
* out from under us.
*/
if ( node_ptr == NULL ) {
HDassert( (actual_slist_len + cache_ptr->slist_len) ==
(initial_slist_len + cache_ptr->slist_len_increase) );
HDassert( (actual_slist_size + cache_ptr->slist_size) ==
(initial_slist_size + cache_ptr->slist_size_increase) );
}
#endif /* H5C_DO_SANITY_CHECKS */
/* Since we are doing a destroy, we must make a pass through
* the hash table and try to flush - destroy all entries that
* remain.
*
* It used to be that all entries remaining in the cache at
* this point had to be clean, but with the fractal heap mods
* this may not be the case. If so, we will flush entries out
* of increasing address order.
*
* Writes to disk are possible here.
*/
for ( i = 0; i < H5C__HASH_TABLE_LEN; i++ )
{
next_entry_ptr = cache_ptr->index[i];
while ( next_entry_ptr != NULL )
{
entry_ptr = next_entry_ptr;
next_entry_ptr = entry_ptr->ht_next;
#ifndef NDEBUG
HDassert ( ( next_entry_ptr == NULL ) ||
( next_entry_ptr->magic ==
H5C__H5C_CACHE_ENTRY_T_MAGIC ) );
#endif /* NDEBUG */
if ( entry_ptr->is_protected ) {
#ifndef NDEBUG
HDassert( entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC );
#endif /* NDEBUG */
/* we have major problems -- but lets flush and destroy
* everything we can before we flag an error.
*/
protected_entries++;
if ( ! entry_ptr->in_slist ) {
HDassert( !(entry_ptr->is_dirty) );
}
} else if ( ! ( entry_ptr->is_pinned ) ) {
status = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
NULL,
entry_ptr->addr,
(cooked_flags | H5C__FLUSH_INVALIDATE_FLAG),
&first_flush,
TRUE);
if ( status < 0 ) {
/* This shouldn't happen -- if it does, we are toast so
* just scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"Entry flush destroy failed.")
}
}
/* We can't do anything if the entry is pinned. The
* hope is that the entry will be unpinned as the
* result of destroys of entries that reference it.
*
* We detect this by noting the change in the number
* of pinned entries from pass to pass. If it stops
* shrinking before it hits zero, we scream and die.
*/
/* if the flush function on the entry we last evicted
* loaded an entry into cache (as Quincey has promised me
* it never will), and if the cache was full, it is
* possible that *next_entry_ptr was flushed or evicted.
*
* Test to see if this happened here. Note that if this
* test is triggred, we are accessing a deallocated piece
* of dynamically allocated memory, so we just scream and
* die.
*/
#ifndef NDEBUG
if ( ( next_entry_ptr != NULL ) &&
( next_entry_ptr->magic !=
H5C__H5C_CACHE_ENTRY_T_MAGIC ) ) {
/* Something horrible has happened to
* *next_entry_ptr -- scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"next_entry_ptr->magic is invalid?!?!?.")
}
#endif /* NDEBUG */
} /* end while loop scanning hash table bin */
} /* end for loop scanning hash table */
old_pel_len = cur_pel_len;
cur_pel_len = cache_ptr->pel_len;
if ( ( cur_pel_len > 0 ) && ( cur_pel_len >= old_pel_len ) ) {
/* The number of pinned entries is positive, and it is not
* declining. Scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"Pinned entry count not decreasing.")
} else if ( ( cur_pel_len == 0 ) && ( old_pel_len == 0 ) ) {
/* increment the pass count */
passes++;
}
if ( passes >= H5C__MAX_PASSES_ON_FLUSH ) {
/* we have exceeded the maximum number of passes through the
* cache to flush and destroy all entries. Scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"Maximum passes on flush exceeded.")
}
} /* main while loop */
/* Invariants, after destroying all entries in the hash table */
HDassert( cache_ptr->index_size == 0 );
HDassert( cache_ptr->clean_index_size == 0 );
HDassert( cache_ptr->dirty_index_size == 0 );
HDassert( cache_ptr->slist_len == 0 );
HDassert( cache_ptr->slist_size == 0 );
HDassert( cache_ptr->pel_len == 0 );
HDassert( cache_ptr->pel_size == 0 );
HDassert( cache_ptr->pl_len == 0 );
HDassert( cache_ptr->pl_size == 0 );
HDassert( cache_ptr->LRU_list_len == 0 );
HDassert( cache_ptr->LRU_list_size == 0 );
HDassert( protected_entries <= cache_ptr->pl_len );
if ( protected_entries > 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"Cache has protected entries.")
} else if ( cur_pel_len > 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"Can't unpin all pinned entries.")
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_flush_invalidate_cache() */
/*-------------------------------------------------------------------------
*
* Function: H5C_flush_single_entry
*
* Purpose: Flush or clear (and evict if requested) the cache entry
* with the specified address and type. If the type is NULL,
* any unprotected entry at the specified address will be
* flushed (and possibly evicted).
*
* Attempts to flush a protected entry will result in an
* error.
*
* *first_flush_ptr should be true if only one
* flush is contemplated before the next load, or if this
* is the first of a sequence of flushes that will be
* completed before the next load. *first_flush_ptr is set
* to false if a flush actually takes place, and should be
* left false until the end of the sequence.
*
* The primary_dxpl_id is used if *first_flush_ptr is TRUE
* on entry, and a flush actually takes place. The
* secondary_dxpl_id is used in any subsequent flush where
* *first_flush_ptr is FALSE on entry.
*
* If the H5C__FLUSH_INVALIDATE_FLAG flag is set, the entry will
* be cleared and not flushed -- in the case *first_flush_ptr,
* primary_dxpl_id, and secondary_dxpl_id are all irrelevent,
* and the call can't be part of a sequence of flushes.
*
* If the caller knows the address of the TBBT node at
* which the target entry resides, it can avoid a lookup
* by supplying that address in the tgt_node_ptr parameter.
* If this parameter is NULL, the function will do a TBBT
* search for the entry instead.
*
* The function does nothing silently if there is no entry
* at the supplied address, or if the entry found has the
* wrong type.
*
* Return: Non-negative on success/Negative on failure or if there was
* an attempt to flush a protected item.
*
* Programmer: John Mainzer, 5/5/04
*
* Modifications:
*
* JRM -- 7/21/04
* Updated function for the addition of the hash table.
*
* QAK -- 11/26/04
* Updated function for the switch from TBBTs to skip lists.
*
* JRM -- 1/6/05
* Updated function to reset the flush_marker field.
* Also replace references to H5F_FLUSH_INVALIDATE and
* H5F_FLUSH_CLEAR_ONLY with references to
* H5C__FLUSH_INVALIDATE_FLAG and H5C__FLUSH_CLEAR_ONLY_FLAG
* respectively.
*
* JRM -- 6/24/05
* Added code to remove dirty entries from the slist after
* they have been flushed. Also added a sanity check that
* will scream if we attempt a write when writes are
* completely disabled.
*
* JRM -- 7/5/05
* Added code to call the new log_flush callback whenever
* a dirty entry is written to disk. Note that the callback
* is not called if the H5C__FLUSH_CLEAR_ONLY_FLAG is set,
* as there is no write to file in this case.
*
* JRM -- 8/21/06
* Added code maintaining the flush_in_progress and
* destroy_in_progress fields in H5C_cache_entry_t.
*
* Also added flush_flags parameter to the call to
* type_ptr->flush() so that the flush routine can report
* whether the entry has been resized or moved. Added
* code using the flush_flags variable to detect the case
* in which the target entry is resized during flush, and
* update the caches data structures accordingly.
*
* JRM -- 3/29/07
* Added sanity checks on the new is_read_only and
* ro_ref_count fields.
*
* QAK -- 2/07/08
* Separated "destroy entry" concept from "remove entry from
* cache" concept, by adding the 'take_ownership' flag and
* the "destroy_entry" variable.
*
* JRM -- 11/5/08
* Added call to H5C__UPDATE_INDEX_FOR_ENTRY_CLEAN() to
* maintain the new clean_index_size and clean_index_size
* fields of H5C_t.
*
*-------------------------------------------------------------------------
*/
static herr_t
H5C_flush_single_entry(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
const H5C_class_t * type_ptr,
haddr_t addr,
unsigned flags,
hbool_t * first_flush_ptr,
hbool_t del_entry_from_slist_on_destroy)
{
H5C_t * cache_ptr = f->shared->cache;
hbool_t destroy;
hbool_t clear_only;
hbool_t take_ownership;
hbool_t was_dirty;
hbool_t destroy_entry;
herr_t status;
int type_id;
unsigned flush_flags = H5C_CALLBACK__NO_FLAGS_SET;
H5C_cache_entry_t * entry_ptr = NULL;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5C_flush_single_entry)
HDassert( f );
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( cache_ptr->skip_file_checks || f );
HDassert( H5F_addr_defined(addr) );
HDassert( first_flush_ptr );
destroy = ( (flags & H5C__FLUSH_INVALIDATE_FLAG) != 0 );
clear_only = ( (flags & H5C__FLUSH_CLEAR_ONLY_FLAG) != 0);
take_ownership = ( (flags & H5C__TAKE_OWNERSHIP_FLAG) != 0);
/* Set the flag for destroying the entry, based on the 'take ownership'
* and 'destroy' flags
*/
if(take_ownership)
destroy_entry = FALSE;
else
destroy_entry = destroy;
/* attempt to find the target entry in the hash table */
H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL)
#if H5C_DO_SANITY_CHECKS
if ( entry_ptr != NULL ) {
HDassert( ! ( ( destroy ) && ( entry_ptr->is_pinned ) ) );
if ( entry_ptr->in_slist ) {
if ( ( ( entry_ptr->flush_marker ) && ( ! entry_ptr->is_dirty ) ) ||
( entry_ptr->addr != addr ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"entry in slist failed sanity checks.")
}
} else {
if ( ( entry_ptr->is_dirty ) ||
( entry_ptr->flush_marker ) ||
( entry_ptr->addr != addr ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"entry failed sanity checks.")
}
}
}
#if 0
/* this should be useful for debugging from time to time.
* lets leave it in for now. -- JRM 12/15/04
*/
else {
HDfprintf(stdout,
"H5C_flush_single_entry(): non-existant entry. addr = %a\n",
addr);
HDfflush(stdout);
}
#endif
#endif /* H5C_DO_SANITY_CHECKS */
if ( ( entry_ptr != NULL ) && ( entry_ptr->is_protected ) )
{
/* Attempt to flush a protected entry -- scream and die. */
HGOTO_ERROR(H5E_CACHE, H5E_PROTECT, FAIL, \
"Attempt to flush a protected entry.")
}
if ( ( entry_ptr != NULL ) &&
( ( type_ptr == NULL ) || ( type_ptr->id == entry_ptr->type->id ) ) )
{
/* we have work to do */
/* We will set flush_in_progress back to FALSE at the end if the
* entry still exists at that point.
*/
entry_ptr->flush_in_progress = TRUE;
#ifdef H5_HAVE_PARALLEL
#ifndef NDEBUG
/* If MPI based VFD is used, do special parallel I/O sanity checks.
* Note that we only do these sanity checks when the clear_only flag
* is not set, and the entry to be flushed is dirty. Don't bother
* otherwise as no file I/O can result.
*
* There are also cases (testing for instance) where it is convenient
* to pass in dummy dxpl_ids. Since we don't use the dxpl_ids directly,
* this isn't a problem -- but we do have to turn off sanity checks
* involving them. We use cache_ptr->skip_dxpl_id_checks to do this.
*/
if ( ( ! cache_ptr->skip_dxpl_id_checks ) &&
( ! clear_only ) &&
( entry_ptr->is_dirty ) &&
( IS_H5FD_MPI(f) ) ) {
H5P_genplist_t *dxpl; /* Dataset transfer property list */
H5FD_mpio_xfer_t xfer_mode; /* I/O xfer mode property value */
/* Get the dataset transfer property list */
if ( NULL == (dxpl = H5I_object(primary_dxpl_id)) ) {
HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, \
"not a dataset transfer property list")
}
/* Get the transfer mode property */
if( H5P_get(dxpl, H5D_XFER_IO_XFER_MODE_NAME, &xfer_mode) < 0 ) {
HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, \
"can't retrieve xfer mode")
}
/* Sanity check transfer mode */
HDassert( xfer_mode == H5FD_MPIO_COLLECTIVE );
}
#endif /* NDEBUG */
#endif /* H5_HAVE_PARALLEL */
was_dirty = entry_ptr->is_dirty;
type_id = entry_ptr->type->id;
entry_ptr->flush_marker = FALSE;
if ( clear_only ) {
H5C__UPDATE_STATS_FOR_CLEAR(cache_ptr, entry_ptr)
} else {
H5C__UPDATE_STATS_FOR_FLUSH(cache_ptr, entry_ptr)
}
if ( destroy ) {
H5C__UPDATE_STATS_FOR_EVICTION(cache_ptr, entry_ptr)
}
/* Always remove the entry from the hash table on a destroy. On a
* flush with destroy, it is cheaper to discard the skip list all at
* once rather than remove the entries one by one, so we only delete
* from the slist only if requested.
*
* We must do deletions now as the callback routines will free the
* entry if destroy is true.
*
* Note that it is possible that the entry will be moved during
* its call to flush. This will upset H5C_move_entry() if we
* don't tell it that it doesn't have to worry about updating the
* index and SLIST. Use the destroy_in_progress field for this
* purpose.
*/
if ( destroy ) {
entry_ptr->destroy_in_progress = TRUE;
H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr)
if ( ( entry_ptr->in_slist ) &&
( del_entry_from_slist_on_destroy ) ) {
H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr)
}
}
/* Update the replacement policy for the flush or eviction.
* Again, do this now so we don't have to reference freed
* memory in the destroy case.
*/
if ( destroy ) { /* AKA eviction */
#if 0 /* JRM */
/* This test code may come in handy -- lets keep it for a while.
*
* Note that it will cause spurious errors in the serial case
* unless we are maintaining the clean and dirty LRU lists.
*/
{
if ( entry_ptr->is_dirty )
{
if ( cache_ptr->dLRU_head_ptr == NULL )
HDfprintf(stdout,
"%s: cache_ptr->dLRU_head_ptr == NULL.\n",
FUNC);
if ( cache_ptr->dLRU_tail_ptr == NULL )
HDfprintf(stdout,
"%s: cache_ptr->dLRU_tail_ptr == NULL.\n",
FUNC);
if ( cache_ptr->dLRU_list_len <= 0 )
HDfprintf(stdout,
"%s: cache_ptr->dLRU_list_len <= 0.\n",
FUNC);
if ( cache_ptr->dLRU_list_size <= 0 )
HDfprintf(stdout,
"%s: cache_ptr->dLRU_list_size <= 0.\n",
FUNC);
if ( cache_ptr->dLRU_list_size < entry_ptr->size )
HDfprintf(stdout,
"%s: cache_ptr->dLRU_list_size < entry_ptr->size.\n",
FUNC);
if ( ( (cache_ptr->dLRU_list_size) == entry_ptr->size ) &&
( ! ( (cache_ptr->dLRU_list_len) == 1 ) ) )
HDfprintf(stdout,
"%s: dLRU_list_size == size && dLRU_list_len != 1\n",
FUNC);
if ( ( entry_ptr->aux_prev == NULL ) &&
( cache_ptr->dLRU_head_ptr != entry_ptr ) )
HDfprintf(stdout,
"%s: entry_ptr->aux_prev == NULL && dLRU_head_ptr != entry_ptr\n",
FUNC);
if ( ( entry_ptr->aux_next == NULL ) &&
( cache_ptr->dLRU_tail_ptr != entry_ptr ) )
HDfprintf(stdout,
"%s: entry_ptr->aux_next == NULL && dLRU_tail_ptr != entry_ptr\n",
FUNC);
if ( ( cache_ptr->dLRU_list_len == 1 ) &&
( ! ( ( cache_ptr->dLRU_head_ptr == entry_ptr ) &&
( cache_ptr->dLRU_tail_ptr == entry_ptr ) &&
( entry_ptr->aux_next == NULL ) &&
( entry_ptr->aux_prev == NULL ) &&
( cache_ptr->dLRU_list_size == entry_ptr->size )
)
)
)
{
HDfprintf(stdout,
"%s: single entry dlru sanity check fails\n",
FUNC);
}
}
else
{
if ( cache_ptr->cLRU_head_ptr == NULL )
HDfprintf(stdout,
"%s: cache_ptr->cLRU_head_ptr == NULL.\n",
FUNC);
if ( cache_ptr->cLRU_tail_ptr == NULL )
HDfprintf(stdout,
"%s: cache_ptr->cLRU_tail_ptr == NULL.\n",
FUNC);
if ( cache_ptr->cLRU_list_len <= 0 )
HDfprintf(stdout,
"%s: cache_ptr->cLRU_list_len <= 0.\n",
FUNC);
if ( cache_ptr->cLRU_list_size <= 0 )
HDfprintf(stdout,
"%s: cache_ptr->cLRU_list_size <= 0.\n",
FUNC);
if ( cache_ptr->cLRU_list_size < entry_ptr->size )
HDfprintf(stdout,
"%s: cache_ptr->cLRU_list_size < entry_ptr->size.\n",
FUNC);
if ( ( (cache_ptr->cLRU_list_size) == entry_ptr->size ) &&
( ! ( (cache_ptr->cLRU_list_len) == 1 ) ) )
HDfprintf(stdout,
"%s: cLRU_list_size == size && cLRU_list_len != 1\n",
FUNC);
if ( ( entry_ptr->aux_prev == NULL ) &&
( cache_ptr->cLRU_head_ptr != entry_ptr ) )
HDfprintf(stdout, "%s: entry_ptr->aux_prev == NULL && cLRU_head_ptr != entry_ptr\n", FUNC);
if ( ( entry_ptr->aux_next == NULL ) &&
( cache_ptr->cLRU_tail_ptr != entry_ptr ) )
HDfprintf(stdout, "%s: entry_ptr->aux_next == NULL && cLRU_tail_ptr != entry_ptr\n", FUNC);
if ( ( cache_ptr->cLRU_list_len == 1 ) &&
( ! ( ( cache_ptr->cLRU_head_ptr == entry_ptr ) &&
( cache_ptr->cLRU_tail_ptr == entry_ptr ) &&
( entry_ptr->aux_next == NULL ) &&
( entry_ptr->aux_prev == NULL ) &&
( cache_ptr->cLRU_list_size == entry_ptr->size )
)
)
)
{
HDfprintf(stdout,
"%s: single entry clru sanity check fails\n",
FUNC);
}
}
}
#endif /* JRM */
H5C__UPDATE_RP_FOR_EVICTION(cache_ptr, entry_ptr, FAIL)
} else {
H5C__UPDATE_RP_FOR_FLUSH(cache_ptr, entry_ptr, FAIL)
}
/* Clear the dirty flag only, if requested */
if ( clear_only ) {
if ( destroy ) {
#ifndef NDEBUG
/* we are about to call the clear callback with the
* destroy flag set -- this will result in *entry_ptr
* being freed. Set the magic field to bad magic
* so we can detect a freed cache entry if we see
* one.
*/
entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC;
#endif /* NDEBUG */
entry_ptr->cache_ptr = NULL;
}
/* Call the callback routine to clear all dirty flags for object */
if ( (entry_ptr->type->clear)(f, entry_ptr, destroy_entry) < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "can't clear entry")
}
} else {
#if H5C_DO_SANITY_CHECKS
if ( ( entry_ptr->is_dirty ) &&
( cache_ptr->check_write_permitted == NULL ) &&
( ! (cache_ptr->write_permitted) ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Write when writes are always forbidden!?!?!")
}
#endif /* H5C_DO_SANITY_CHECKS */
if ( destroy ) {
#ifndef NDEBUG
/* we are about to call the flush callback with the
* destroy flag set -- this will result in *entry_ptr
* being freed. Set the magic field to bad magic
* so we can detect a freed cache entry if we see
* one.
*/
entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_BAD_MAGIC;
#endif /* NDEBUG */
entry_ptr->cache_ptr = NULL;
}
/* Only block for all the processes on the first piece of metadata
*/
if ( *first_flush_ptr && entry_ptr->is_dirty ) {
status = (entry_ptr->type->flush)(f, primary_dxpl_id, destroy_entry,
entry_ptr->addr, entry_ptr,
&flush_flags);
*first_flush_ptr = FALSE;
} else {
status = (entry_ptr->type->flush)(f, secondary_dxpl_id,
destroy_entry, entry_ptr->addr,
entry_ptr, &flush_flags);
}
if ( status < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"unable to flush entry")
}
#ifdef H5_HAVE_PARALLEL
if ( flush_flags != H5C_CALLBACK__NO_FLAGS_SET ) {
/* In the parallel case, flush operations can
* cause problems. If they occur, scream and
* die.
*
* At present, in the parallel case, the aux_ptr
* will only be set if there is more than one
* process. Thus we can use this to detect
* the parallel case.
*
* This works for now, but if we start using the
* aux_ptr for other purposes, we will have to
* change this test accordingly.
*
* NB: While this test detects entryies that attempt
* to resize or move themselves during a flush
* in the parallel case, it will not detect an
* entry that dirties, resizes, and/or moves
* other entries during its flush.
*
* From what Quincey tells me, this test is
* sufficient for now, as any flush routine that
* does the latter will also do the former.
*
* If that ceases to be the case, further
* tests will be necessary.
*/
if ( cache_ptr->aux_ptr != NULL ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"resize/move in serialize occured in parallel case.")
}
}
#endif /* H5_HAVE_PARALLEL */
}
if ( ( ! destroy ) && ( entry_ptr->in_slist ) ) {
H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr)
}
if ( ( ! destroy ) && ( was_dirty ) ) {
H5C__UPDATE_INDEX_FOR_ENTRY_CLEAN(cache_ptr, entry_ptr);
}
if ( ! destroy ) { /* i.e. if the entry still exists */
HDassert( !(entry_ptr->is_dirty) );
HDassert( !(entry_ptr->flush_marker) );
HDassert( !(entry_ptr->in_slist) );
HDassert( !(entry_ptr->is_protected) );
HDassert( !(entry_ptr->is_read_only) );
HDassert( (entry_ptr->ro_ref_count) == 0 );
if ( (flush_flags & H5C_CALLBACK__SIZE_CHANGED_FLAG) != 0 ) {
/* The entry size changed as a result of the flush.
*
* Most likely, the entry was compressed, and the
* new version is of a different size than the old.
*
* In any case, we must update entry and cache size
* accordingly.
*/
size_t new_size;
if ( (entry_ptr->type->size)(f, (void *)entry_ptr, &new_size)
< 0 ) {
HGOTO_ERROR(H5E_RESOURCE, H5E_CANTGETSIZE, FAIL, \
"Can't get entry size after flush")
}
if ( new_size != entry_ptr->size ) {
HDassert( entry_ptr->size < H5C_MAX_ENTRY_SIZE );
/* update the hash table for the size change
* We pass TRUE as the was_clean parameter, as we
* have already updated the clean and dirty index
* size fields for the fact that the entry has
* been flushed. (See above call to
* H5C__UPDATE_INDEX_FOR_ENTRY_CLEAN()).
*/
H5C__UPDATE_INDEX_FOR_SIZE_CHANGE((cache_ptr), \
(entry_ptr->size),\
(new_size), \
(entry_ptr), \
(TRUE));
/* The entry can't be protected since we just flushed it.
* Thus we must update the replacement policy data
* structures for the size change. The macro deals
* with the pinned case.
*/
H5C__UPDATE_RP_FOR_SIZE_CHANGE(cache_ptr, entry_ptr, \
new_size)
/* The entry can't be in the slist, so no need to update
* the slist for the size change.
*/
/* update stats for the size change */
H5C__UPDATE_STATS_FOR_ENTRY_SIZE_CHANGE(cache_ptr, \
entry_ptr, \
new_size)
/* finally, update the entry size proper */
entry_ptr->size = new_size;
}
}
if ( (flush_flags & H5C_CALLBACK__MOVED_FLAG) != 0 ) {
/* The entry was moved as the result of the flush.
*
* Most likely, the entry was compressed, and the
* new version is larger than the old and thus had
* to be relocated.
*
* At preset, all processing for this case is
* handled elsewhere. But lets keep the if statement
* around just in case.
*/
}
entry_ptr->flush_in_progress = FALSE;
}
if ( cache_ptr->log_flush ) {
status = (cache_ptr->log_flush)(cache_ptr, addr, was_dirty,
flags, type_id);
if ( status < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"log_flush callback failed.")
}
}
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_flush_single_entry() */
/*-------------------------------------------------------------------------
*
* Function: H5C_load_entry
*
* Purpose: Attempt to load the entry at the specified disk address
* and with the specified type into memory. If successful.
* return the in memory address of the entry. Return NULL
* on failure.
*
* Note that this function simply loads the entry into
* core. It does not insert it into the cache.
*
* Return: Non-NULL on success / NULL on failure.
*
* Programmer: John Mainzer, 5/18/04
*
* Modifications:
*
* JRM - 7/21/04
* Updated function for the addition of the hash table.
*
* JRM - 6/23/06
* Deleted assertion that verified that a newly loaded
* entry is clean. Due to a bug fix, this need not be
* the case, as our code will attempt to repair errors
* on load.
*
* JRM - 8/21/06
* Added initialization for the new flush_in_progress and
* destroy in progress fields.
*
* JRM - 3/29/07
* Added initialization for the new is_read_only and
* ro_ref_count fields.
*
* QAK -- 1/31/08
* Added initialization for the new free_file_space_on_destroy
* field.
*
*-------------------------------------------------------------------------
*/
static void *
H5C_load_entry(H5F_t * f,
hid_t dxpl_id,
const H5C_class_t * type,
haddr_t addr,
void * udata,
#ifndef NDEBUG
hbool_t skip_file_checks)
#else /* NDEBUG */
hbool_t UNUSED skip_file_checks)
#endif /* NDEBUG */
{
void * thing = NULL;
void * ret_value = NULL;
H5C_cache_entry_t * entry_ptr = NULL;
FUNC_ENTER_NOAPI_NOINIT(H5C_load_entry)
HDassert( f );
HDassert( f->shared );
HDassert( f->shared->cache );
HDassert( skip_file_checks || f );
HDassert( type );
HDassert( type->load );
HDassert( type->size );
HDassert( H5F_addr_defined(addr) );
if ( NULL == (thing = (type->load)(f, dxpl_id, addr, udata)) ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "unable to load entry")
}
entry_ptr = (H5C_cache_entry_t *)thing;
/* In general, an entry should be clean just after it is loaded.
*
* However, when this code is used in the metadata cache, it is
* possible that object headers will be dirty at this point, as
* the load function will alter object headers if necessary to
* fix an old bug.
*
* To support this bug fix, I have replace the old assert:
*
* HDassert( entry_ptr->is_dirty == FALSE );
*
* with:
*
* HDassert( ( entry_ptr->is_dirty == FALSE ) || ( type->id == 5 ) );
*
* Note that type id 5 is associated with object headers in the metadata
* cache.
*
* When we get to using H5C for other purposes, we may wish to
* tighten up the assert so that the loophole only applies to the
* metadata cache.
*/
HDassert( ( entry_ptr->is_dirty == FALSE ) || ( type->id == 5 ) );
#ifndef NDEBUG
entry_ptr->magic = H5C__H5C_CACHE_ENTRY_T_MAGIC;
#endif /* NDEBUG */
entry_ptr->cache_ptr = f->shared->cache;
entry_ptr->addr = addr;
entry_ptr->type = type;
entry_ptr->is_protected = FALSE;
entry_ptr->is_read_only = FALSE;
entry_ptr->ro_ref_count = 0;
entry_ptr->in_slist = FALSE;
entry_ptr->flush_marker = FALSE;
#ifdef H5_HAVE_PARALLEL
entry_ptr->clear_on_unprotect = FALSE;
#endif /* H5_HAVE_PARALLEL */
entry_ptr->flush_in_progress = FALSE;
entry_ptr->destroy_in_progress = FALSE;
entry_ptr->free_file_space_on_destroy = FALSE;
if ( (type->size)(f, thing, &(entry_ptr->size)) < 0 ) {
HGOTO_ERROR(H5E_RESOURCE, H5E_CANTGETSIZE, NULL, \
"Can't get size of thing")
}
HDassert( entry_ptr->size < H5C_MAX_ENTRY_SIZE );
entry_ptr->ht_next = NULL;
entry_ptr->ht_prev = NULL;
entry_ptr->next = NULL;
entry_ptr->prev = NULL;
entry_ptr->aux_next = NULL;
entry_ptr->aux_prev = NULL;
H5C__RESET_CACHE_ENTRY_STATS(entry_ptr);
ret_value = thing;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_load_entry() */
/*-------------------------------------------------------------------------
*
* Function: H5C_make_space_in_cache
*
* Purpose: Attempt to evict cache entries until the index_size
* is at least needed_space below max_cache_size.
*
* In passing, also attempt to bring cLRU_list_size to a
* value greater than min_clean_size.
*
* Depending on circumstances, both of these goals may
* be impossible, as in parallel mode, we must avoid generating
* a write as part of a read (to avoid deadlock in collective
* I/O), and in all cases, it is possible (though hopefully
* highly unlikely) that the protected list may exceed the
* maximum size of the cache.
*
* Thus the function simply does its best, returning success
* unless an error is encountered.
*
* The primary_dxpl_id and secondary_dxpl_id parameters
* specify the dxpl_ids used on the first write occasioned
* by the call (primary_dxpl_id), and on all subsequent
* writes (secondary_dxpl_id). This is useful in the metadata
* cache, but may not be needed elsewhere. If so, just use the
* same dxpl_id for both parameters.
*
* Observe that this function cannot occasion a read.
*
* Return: Non-negative on success/Negative on failure.
*
* Programmer: John Mainzer, 5/14/04
*
* Modifications:
*
* JRM --7/21/04
* Minor modifications in support of the addition of a hash
* table to facilitate lookups.
*
* JRM -- 11/22/04
* Added the first_flush_ptr parameter, which replaces the
* old first_flush local variable. This allows the function
* to coordinate on the first flush issue with other functions.
*
* JRM -- 12/13/04
* Added code to skip over epoch markers if present.
*
* JRM -- 1/3/06
* Modified function to work correctly when the the cache
* is not full. This case occurs when we need to flush to
* min clean size before the cache has filled.
*
* JRM -- 3/29/07
* Added sanity checks using the new is_read_only and
* ro_ref_count fields.
*
* JRM -- 10/13/07
* Added code to detect and manage the case in which a
* flush callback changes the LRU-list out from under
* the function. The only way I can think of in which this
* can happen is if a flush function loads an entry
* into the cache that isn't there already. Quincey tells
* me that this will never happen, but I'm not sure I
* believe him.
*
* Note that this is a pretty bad scenario if it ever
* happens. The code I have added should allow us to
* handle the situation under all but the worst conditions,
* but one can argue that I should just scream and die if I
* ever detect the condidtion.
*
* JRM -- 11/13/08
* Modified function to always observe the min_clean_size
* whether we are maintaining the clean and dirt LRU lists
* or not. To do this, we had to add the new clean_index_size
* and dirty_index_size fields to H5C_t, and supporting code
* as needed throughout the cache.
*
* The purpose of this modification is to avoid "metadata
* blizzards" in the write only case. In such instances,
* the cache was allowed to fill with dirty metadata. When
* we finally needed to evict an entry to make space, we had
* to flush out a whole cache full of metadata -- which has
* interesting performance effects. We hope to avoid (or
* perhaps more accurately hide) this effect by maintaining
* the min_clean_size, which should force us to start flushing
* entries long before we actually have to evict something
* to make space.
*
* MAM -- 01/06/09
* Added code to maintain clean_entries_skipped and total_entries
* scanned statistics.
*-------------------------------------------------------------------------
*/
static herr_t
H5C_make_space_in_cache(H5F_t * f,
hid_t primary_dxpl_id,
hid_t secondary_dxpl_id,
size_t space_needed,
hbool_t write_permitted,
hbool_t * first_flush_ptr)
{
H5C_t * cache_ptr = f->shared->cache;
herr_t result;
#if H5C_COLLECT_CACHE_STATS
int32_t clean_entries_skipped = 0;
int32_t total_entries_scanned = 0;
#endif /* H5C_COLLECT_CACHE_STATS */
int32_t entries_examined = 0;
int32_t initial_list_len;
size_t empty_space;
hbool_t prev_is_dirty = FALSE;
hbool_t didnt_flush_entry = FALSE;
H5C_cache_entry_t * entry_ptr;
H5C_cache_entry_t * prev_ptr;
H5C_cache_entry_t * next_ptr;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT(H5C_make_space_in_cache)
HDassert( f );
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( first_flush_ptr != NULL );
HDassert( ( *first_flush_ptr == TRUE ) || ( *first_flush_ptr == FALSE ) );
HDassert( cache_ptr->index_size ==
(cache_ptr->clean_index_size + cache_ptr->dirty_index_size) );
if ( write_permitted ) {
initial_list_len = cache_ptr->LRU_list_len;
entry_ptr = cache_ptr->LRU_tail_ptr;
if ( cache_ptr->index_size >= cache_ptr->max_cache_size ) {
empty_space = 0;
} else {
empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;
}
while ( ( ( (cache_ptr->index_size + space_needed)
>
cache_ptr->max_cache_size
)
||
(
( empty_space + cache_ptr->clean_index_size )
<
( cache_ptr->min_clean_size )
)
)
&&
( entries_examined <= (2 * initial_list_len) )
&&
( entry_ptr != NULL )
)
{
HDassert( ! (entry_ptr->is_protected) );
HDassert( ! (entry_ptr->is_read_only) );
HDassert( (entry_ptr->ro_ref_count) == 0 );
next_ptr = entry_ptr->next;
prev_ptr = entry_ptr->prev;
if ( prev_ptr != NULL ) {
prev_is_dirty = prev_ptr->is_dirty;
}
if ( (entry_ptr->type)->id != H5C__EPOCH_MARKER_TYPE ) {
didnt_flush_entry = FALSE;
if ( entry_ptr->is_dirty ) {
#if H5C_COLLECT_CACHE_STATS
if ( (cache_ptr->index_size + space_needed)
>
cache_ptr->max_cache_size ) {
cache_ptr->entries_scanned_to_make_space++;
}
#endif /* H5C_COLLECT_CACHE_STATS */
result = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
entry_ptr->addr,
H5C__NO_FLAGS_SET,
first_flush_ptr,
FALSE);
} else if ( (cache_ptr->index_size + space_needed)
>
cache_ptr->max_cache_size ) {
#if H5C_COLLECT_CACHE_STATS
cache_ptr->entries_scanned_to_make_space++;
#endif /* H5C_COLLECT_CACHE_STATS */
result = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
entry_ptr->addr,
H5C__FLUSH_INVALIDATE_FLAG,
first_flush_ptr,
TRUE);
} else {
/* We have enough space so don't flush clean entry.
* Set result to SUCCEED to avoid triggering the error
* code below.
*/
#if H5C_COLLECT_CACHE_STATS
clean_entries_skipped++;
#endif /* H5C_COLLECT_CACHE_STATS */
didnt_flush_entry = TRUE;
result = SUCCEED;
}
#if H5C_COLLECT_CACHE_STATS
total_entries_scanned++;
#endif /* H5C_COLLECT_CACHE_STATS */
} else {
/* Skip epoch markers. Set result to SUCCEED to avoid
* triggering the error code below.
*/
didnt_flush_entry = TRUE;
result = SUCCEED;
}
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"unable to flush entry")
}
if ( prev_ptr != NULL ) {
#ifndef NDEBUG
if ( prev_ptr->magic != H5C__H5C_CACHE_ENTRY_T_MAGIC ) {
/* something horrible has happened to *prev_ptr --
* scream and die.
*/
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"*prev_ptr corrupt 1")
}
#endif /* NDEBUG */
if ( didnt_flush_entry ) {
/* epoch markers don't get flushed, so the sanity checks
* on normal entries will fail -- thus just set entry_ptr
* to prev_ptr and go on.
*/
entry_ptr = prev_ptr;
} else if ( ( prev_ptr->is_dirty != prev_is_dirty )
||
( prev_ptr->next != next_ptr )
||
( prev_ptr->is_protected )
||
( prev_ptr->is_pinned ) ) {
/* something has happened to the LRU -- start over
* from the tail.
*/
entry_ptr = cache_ptr->LRU_tail_ptr;
} else {
entry_ptr = prev_ptr;
}
} else {
entry_ptr = NULL;
}
entries_examined++;
if ( cache_ptr->index_size >= cache_ptr->max_cache_size ) {
empty_space = 0;
} else {
empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;
}
HDassert( cache_ptr->index_size ==
(cache_ptr->clean_index_size +
cache_ptr->dirty_index_size) );
}
#if H5C_COLLECT_CACHE_STATS
cache_ptr->calls_to_msic++;
cache_ptr->total_entries_skipped_in_msic += clean_entries_skipped;
cache_ptr->total_entries_scanned_in_msic += total_entries_scanned;
if ( clean_entries_skipped > cache_ptr->max_entries_skipped_in_msic ) {
cache_ptr->max_entries_skipped_in_msic = clean_entries_skipped;
}
if ( total_entries_scanned > cache_ptr->max_entries_scanned_in_msic ) {
cache_ptr->max_entries_scanned_in_msic = total_entries_scanned;
}
#endif /* H5C_COLLECT_CACHE_STATS */
HDassert( ( entries_examined > (2 * initial_list_len) ) ||
( (cache_ptr->pl_size + cache_ptr->min_clean_size) >
cache_ptr->max_cache_size ) ||
( ( cache_ptr->clean_index_size + empty_space )
>= cache_ptr->min_clean_size ) );
#if H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS
HDassert( ( entries_examined > (2 * initial_list_len) ) ||
( cache_ptr->cLRU_list_size <= cache_ptr->clean_index_size ) );
HDassert( ( entries_examined > (2 * initial_list_len) ) ||
( cache_ptr->dLRU_list_size <= cache_ptr->dirty_index_size ) );
#endif /* H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS */
} else {
HDassert( H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS );
initial_list_len = cache_ptr->cLRU_list_len;
entry_ptr = cache_ptr->cLRU_tail_ptr;
while ( ( (cache_ptr->index_size + space_needed)
>
cache_ptr->max_cache_size
)
&&
( entries_examined <= initial_list_len )
&&
( entry_ptr != NULL )
)
{
HDassert( ! (entry_ptr->is_protected) );
HDassert( ! (entry_ptr->is_read_only) );
HDassert( (entry_ptr->ro_ref_count) == 0 );
HDassert( ! (entry_ptr->is_dirty) );
prev_ptr = entry_ptr->aux_prev;
result = H5C_flush_single_entry(f,
primary_dxpl_id,
secondary_dxpl_id,
entry_ptr->type,
entry_ptr->addr,
H5C__FLUSH_INVALIDATE_FLAG,
first_flush_ptr,
TRUE);
if ( result < 0 ) {
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, \
"unable to flush entry")
}
entry_ptr = prev_ptr;
entries_examined++;
}
}
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_make_space_in_cache() */
/*-------------------------------------------------------------------------
*
* Function: H5C_validate_lru_list
*
* Purpose: Debugging function that scans the LRU list for errors.
*
* If an error is detected, the function generates a
* diagnostic and returns FAIL. If no error is detected,
* the function returns SUCCEED.
*
* Return: FAIL if error is detected, SUCCEED otherwise.
*
* Programmer: John Mainzer, 7/14/05
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
#if H5C_DO_EXTREME_SANITY_CHECKS
static herr_t
H5C_validate_lru_list(H5C_t * cache_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
int32_t len = 0;
size_t size = 0;
H5C_cache_entry_t * entry_ptr = NULL;
FUNC_ENTER_NOAPI_NOINIT(H5C_validate_lru_list)
HDassert( cache_ptr );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
if ( ( ( cache_ptr->LRU_head_ptr == NULL )
||
( cache_ptr->LRU_tail_ptr == NULL )
)
&&
( cache_ptr->LRU_head_ptr != cache_ptr->LRU_tail_ptr )
) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Check 1 failed")
}
if ( ( cache_ptr->LRU_list_len < 0 ) || ( cache_ptr->LRU_list_size < 0 ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Check 2 failed")
}
if ( ( cache_ptr->LRU_list_len == 1 )
&&
( ( cache_ptr->LRU_head_ptr != cache_ptr->LRU_tail_ptr )
||
( cache_ptr->LRU_head_ptr == NULL )
||
( cache_ptr->LRU_head_ptr->size != cache_ptr->LRU_list_size )
)
) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Check 3 failed")
}
if ( ( cache_ptr->LRU_list_len >= 1 )
&&
( ( cache_ptr->LRU_head_ptr == NULL )
||
( cache_ptr->LRU_head_ptr->prev != NULL )
||
( cache_ptr->LRU_tail_ptr == NULL )
||
( cache_ptr->LRU_tail_ptr->next != NULL )
)
) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Check 4 failed")
}
entry_ptr = cache_ptr->LRU_head_ptr;
while ( entry_ptr != NULL )
{
if ( ( entry_ptr != cache_ptr->LRU_head_ptr ) &&
( ( entry_ptr->prev == NULL ) ||
( entry_ptr->prev->next != entry_ptr ) ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Check 5 failed")
}
if ( ( entry_ptr != cache_ptr->LRU_tail_ptr ) &&
( ( entry_ptr->next == NULL ) ||
( entry_ptr->next->prev != entry_ptr ) ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Check 6 failed")
}
len++;
size += entry_ptr->size;
entry_ptr = entry_ptr->next;
}
if ( ( cache_ptr->LRU_list_len != len ) ||
( cache_ptr->LRU_list_size != size ) ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Check 7 failed")
}
done:
if ( ret_value != SUCCEED ) {
HDassert(0);
}
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_validate_lru_list() */
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
/*-------------------------------------------------------------------------
*
* Function: H5C_verify_not_in_index
*
* Purpose: Debugging function that scans the hash table to verify
* that the specified instance of H5C_cache_entry_t is not
* present.
*
* If an error is detected, the function generates a
* diagnostic and returns FAIL. If no error is detected,
* the function returns SUCCEED.
*
* Return: FAIL if error is detected, SUCCEED otherwise.
*
* Programmer: John Mainzer, 7/14/05
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
#if H5C_DO_EXTREME_SANITY_CHECKS
static herr_t
H5C_verify_not_in_index(H5C_t * cache_ptr,
H5C_cache_entry_t * entry_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
int32_t i;
int32_t depth;
H5C_cache_entry_t * scan_ptr = NULL;
FUNC_ENTER_NOAPI_NOINIT(H5C_verify_not_in_index)
HDassert( cache_ptr != NULL );
HDassert( cache_ptr->magic == H5C__H5C_T_MAGIC );
HDassert( entry_ptr != NULL );
for ( i = 0; i < H5C__HASH_TABLE_LEN; i++ )
{
depth = 0;
scan_ptr = cache_ptr->index[i];
while ( scan_ptr != NULL )
{
if ( scan_ptr == entry_ptr ) {
HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, \
"Entry already in index.")
}
depth++;
scan_ptr = scan_ptr->ht_next;
}
}
done:
if ( ret_value != SUCCEED ) {
HDassert(0);
}
FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_verify_not_in_index() */
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */
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