summaryrefslogtreecommitdiffstats
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rw-r--r--src/H5Cdbg.c4
-rw-r--r--src/H5Cimage.c73
-rw-r--r--src/H5Cpkg.h21
-rw-r--r--src/H5Ctag.c47
4 files changed, 116 insertions, 29 deletions
diff --git a/src/H5Cdbg.c b/src/H5Cdbg.c
index a955eaf..0a98406 100644
--- a/src/H5Cdbg.c
+++ b/src/H5Cdbg.c
@@ -738,9 +738,10 @@ H5C_stats(H5C_t * cache_ptr,
(long long)(cache_ptr->index_scan_restarts));
HDfprintf(stdout,
- "%s cache image creations/loads/size = %d / %d / %Hu\n",
+ "%s cache image creations/reads/loads/size = %d / %d /%d / %Hu\n",
cache_ptr->prefix,
cache_ptr->images_created,
+ cache_ptr->images_read,
cache_ptr->images_loaded,
cache_ptr->last_image_size);
@@ -993,6 +994,7 @@ H5C_stats__reset(H5C_t H5_ATTR_UNUSED * cache_ptr)
cache_ptr->index_scan_restarts = 0;
cache_ptr->images_created = 0;
+ cache_ptr->images_read = 0;
cache_ptr->images_loaded = 0;
cache_ptr->last_image_size = (hsize_t)0;
diff --git a/src/H5Cimage.c b/src/H5Cimage.c
index fc58dac..d60ee05 100644
--- a/src/H5Cimage.c
+++ b/src/H5Cimage.c
@@ -122,7 +122,7 @@ static H5C_cache_entry_t *H5C__reconstruct_cache_entry(const H5F_t *f,
H5C_t *cache_ptr, const uint8_t **buf);
static herr_t H5C__write_cache_image_superblock_msg(H5F_t *f, hid_t dxpl_id,
hbool_t create);
-static herr_t H5C__read_cache_image(H5F_t * f, hid_t dxpl_id, const H5C_t *cache_ptr);
+static herr_t H5C__read_cache_image(H5F_t * f, hid_t dxpl_id, H5C_t *cache_ptr);
static herr_t H5C__write_cache_image(H5F_t *f, hid_t dxpl_id, const H5C_t *cache_ptr);
static herr_t H5C__construct_cache_image_buffer(H5F_t *f, H5C_t *cache_ptr);
static herr_t H5C__free_image_entries_array(H5C_t *cache_ptr);
@@ -1035,7 +1035,7 @@ done:
*-------------------------------------------------------------------------
*/
herr_t
-H5C__read_cache_image(H5F_t *f, hid_t dxpl_id, const H5C_t *cache_ptr)
+H5C__read_cache_image(H5F_t *f, hid_t dxpl_id, H5C_t *cache_ptr)
{
herr_t ret_value = SUCCEED; /* Return value */
@@ -1053,31 +1053,53 @@ H5C__read_cache_image(H5F_t *f, hid_t dxpl_id, const H5C_t *cache_ptr)
H5AC_aux_t *aux_ptr = (H5AC_aux_t *)cache_ptr->aux_ptr;
int mpi_result;
- if((NULL == aux_ptr) || (aux_ptr->mpi_rank == 0)) {
- HDassert((NULL == aux_ptr) || (aux_ptr->magic == H5AC__H5AC_AUX_T_MAGIC));
+ if ( ( NULL == aux_ptr ) || ( aux_ptr->mpi_rank == 0 ) ) {
+
+ HDassert((NULL == aux_ptr) ||
+ (aux_ptr->magic == H5AC__H5AC_AUX_T_MAGIC));
#endif /* H5_HAVE_PARALLEL */
/* Read the buffer (if serial access, or rank 0 of parallel access) */
- if(H5F_block_read(f, H5FD_MEM_SUPER, cache_ptr->image_addr, cache_ptr->image_len, dxpl_id, cache_ptr->image_buffer) < 0)
- HGOTO_ERROR(H5E_CACHE, H5E_READERROR, FAIL, "Can't read metadata cache image block")
+ if ( H5F_block_read(f, H5FD_MEM_SUPER, cache_ptr->image_addr,
+ cache_ptr->image_len, dxpl_id,
+ cache_ptr->image_buffer) < 0)
+
+ HGOTO_ERROR(H5E_CACHE, H5E_READERROR, FAIL, \
+ "Can't read metadata cache image block")
+
+ H5C__UPDATE_STATS_FOR_CACHE_IMAGE_READ(cache_ptr)
#ifdef H5_HAVE_PARALLEL
- if(aux_ptr) {
+ if ( aux_ptr ) {
+
/* Broadcast cache image */
- if(MPI_SUCCESS != (mpi_result = MPI_Bcast(cache_ptr->image_buffer, (int)cache_ptr->image_len, MPI_BYTE, 0, aux_ptr->mpi_comm)))
+ if ( MPI_SUCCESS !=
+ (mpi_result = MPI_Bcast(cache_ptr->image_buffer,
+ (int)cache_ptr->image_len, MPI_BYTE,
+ 0, aux_ptr->mpi_comm)) )
+
HMPI_GOTO_ERROR(FAIL, "MPI_Bcast failed", mpi_result)
+
} /* end if */
} /* end if */
- else if(aux_ptr) {
+ else if ( aux_ptr ) {
+
/* Retrieve the contents of the metadata cache image from process 0 */
- if(MPI_SUCCESS != (mpi_result = MPI_Bcast(cache_ptr->image_buffer, (int)cache_ptr->image_len, MPI_BYTE, 0, aux_ptr->mpi_comm)))
- HMPI_GOTO_ERROR(FAIL, "can't receive cache image MPI_Bcast", mpi_result)
+ if ( MPI_SUCCESS !=
+ (mpi_result = MPI_Bcast(cache_ptr->image_buffer,
+ (int)cache_ptr->image_len, MPI_BYTE,
+ 0, aux_ptr->mpi_comm)) )
+
+ HMPI_GOTO_ERROR(FAIL, "can't receive cache image MPI_Bcast", \
+ mpi_result)
} /* end else-if */
} /* end block */
#endif /* H5_HAVE_PARALLEL */
done:
+
FUNC_LEAVE_NOAPI(ret_value)
+
} /* H5C__read_cache_image() */
@@ -3203,26 +3225,31 @@ H5C__reconstruct_cache_contents(H5F_t *f, hid_t dxpl_id, H5C_t *cache_ptr)
i = -1;
entry_ptr = cache_ptr->LRU_head_ptr;
+
while(entry_ptr != NULL) {
- HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
+
+ HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
HDassert(entry_ptr->type != NULL);
- if(entry_ptr->prefetched) {
- HDassert(i <= entry_ptr->lru_rank);
- HDassert((entry_ptr->lru_rank <= 2) ||
- (entry_ptr->lru_rank == i + 1) ||
- (entry_ptr->lru_rank == i + 2));
+ if ( entry_ptr->prefetched ) {
- if((entry_ptr->lru_rank <= 2) && (entry_ptr->lru_rank == i + 2))
- lru_rank_holes++;
+ HDassert(entry_ptr->lru_rank != 0);
+ HDassert((entry_ptr->lru_rank == -1) ||
+ (entry_ptr->lru_rank > i));
- i = entry_ptr->lru_rank;
- } /* end if */
+ if ( ( entry_ptr->lru_rank > 1 ) &&
+ ( entry_ptr->lru_rank > i + 1 ) )
+
+ lru_rank_holes += entry_ptr->lru_rank - (i + 1);
+
+ i = entry_ptr->lru_rank;
+
+ } /* end if */
- entry_ptr = entry_ptr->next;
+ entry_ptr = entry_ptr->next;
} /* end while */
- /* Holes of size 1 appear in the LRU ranking due to epoch
+ /* Holes in the sequences of LRU ranks can appear due to epoch
* markers. They are left in to allow re-insertion of the
* epoch markers on reconstruction of the cache -- thus
* the following sanity check will have to be revised when
diff --git a/src/H5Cpkg.h b/src/H5Cpkg.h
index 69e8145..90a84c4 100644
--- a/src/H5Cpkg.h
+++ b/src/H5Cpkg.h
@@ -686,6 +686,13 @@ if ( ( ( ( (head_ptr) == NULL ) || ( (tail_ptr) == NULL ) ) && \
(cache_ptr)->images_created++; \
}
+#define H5C__UPDATE_STATS_FOR_CACHE_IMAGE_READ(cache_ptr) \
+{ \
+ /* make sure image len is still good */ \
+ HDassert((cache_ptr)->image_len > 0); \
+ (cache_ptr)->images_read++; \
+}
+
#define H5C__UPDATE_STATS_FOR_CACHE_IMAGE_LOAD(cache_ptr) \
{ \
/* make sure image len is still good */ \
@@ -931,6 +938,7 @@ if ( ( ( ( (head_ptr) == NULL ) || ( (tail_ptr) == NULL ) ) && \
#define H5C__UPDATE_STATS_FOR_LRU_SCAN_RESTART(cache_ptr)
#define H5C__UPDATE_STATS_FOR_INDEX_SCAN_RESTART(cache_ptr)
#define H5C__UPDATE_STATS_FOR_CACHE_IMAGE_CREATE(cache_ptr)
+#define H5C__UPDATE_STATS_FOR_CACHE_IMAGE_READ(cache_ptr)
#define H5C__UPDATE_STATS_FOR_CACHE_IMAGE_LOAD(cache_ptr)
#define H5C__UPDATE_STATS_FOR_PREFETCH(cache_ptr, dirty)
#define H5C__UPDATE_STATS_FOR_PREFETCH_HIT(cache_ptr)
@@ -4549,6 +4557,18 @@ typedef struct H5C_tag_info_t {
* Further, since cache images are only created at file
* close, this field should only be set at that time.
*
+ * images_read: Integer field containing the number of cache images
+ * read from file. Note that reading an image is different
+ * from loading it -- reading the image means just that,
+ * while loading the image refers to decoding it and loading
+ * it into the metadata cache.
+ *
+ * In the serial case, image_read should always equal
+ * images_loaded. However, in the parallel case, the
+ * image should only be read by process 0. All other
+ * processes should receive the cache image via a broadcast
+ * from process 0.
+ *
* images_loaded: Integer field containing the number of cache images
* loaded since the last time statistics were reset.
*
@@ -4864,6 +4884,7 @@ struct H5C_t {
/* Fields for tracking cache image operations */
int32_t images_created;
+ int32_t images_read;
int32_t images_loaded;
hsize_t last_image_size;
diff --git a/src/H5Ctag.c b/src/H5Ctag.c
index a9bcca1..0170ce9 100644
--- a/src/H5Ctag.c
+++ b/src/H5Ctag.c
@@ -58,8 +58,18 @@
typedef struct {
H5F_t * f; /* File pointer for evicting entry */
hid_t dxpl_id; /* DXPL for evicting entry */
- hbool_t evicted_entries_last_pass; /* Flag to indicate that an entry was evicted when iterating over cache */
- hbool_t pinned_entries_need_evicted; /* Flag to indicate that a pinned entry was attempted to be evicted */
+ hbool_t evicted_entries_last_pass; /* Flag to indicate that an entry
+ * was evicted when iterating over
+ * cache
+ */
+ hbool_t pinned_entries_need_evicted;/* Flag to indicate that a pinned
+ * entry was attempted to be evicted
+ */
+ hbool_t skipped_pf_dirty_entries; /* Flag indicating that one or more
+ * entries marked prefetched_dirty
+ * were encountered and not
+ * evicted.
+ */
} H5C_tag_iter_evict_ctx_t;
/* Typedef for tagged entry iterator callback context - expunge tag type metadata */
@@ -470,7 +480,9 @@ H5C__evict_tagged_entries_cb(H5C_cache_entry_t *entry, void *_ctx)
if(H5C__flush_single_entry(ctx->f, ctx->dxpl_id, entry, H5C__FLUSH_INVALIDATE_FLAG | H5C__FLUSH_CLEAR_ONLY_FLAG | H5C__DEL_FROM_SLIST_ON_DESTROY_FLAG) < 0)
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, H5_ITER_ERROR, "Entry eviction failed.")
ctx->evicted_entries_last_pass = TRUE;
- } /* end else */
+ } else {
+ ctx->skipped_pf_dirty_entries = TRUE;
+ }
done:
FUNC_LEAVE_NOAPI(ret_value)
@@ -516,6 +528,7 @@ H5C_evict_tagged_entries(H5F_t * f, hid_t dxpl_id, haddr_t tag, hbool_t match_gl
/* Reset pinned/evicted tracking flags */
ctx.pinned_entries_need_evicted = FALSE;
ctx.evicted_entries_last_pass = FALSE;
+ ctx.skipped_pf_dirty_entries = FALSE;
/* Iterate through entries in the cache */
if(H5C__iter_tagged_entries(cache, tag, match_global, H5C__evict_tagged_entries_cb, &ctx) < 0)
@@ -524,8 +537,32 @@ H5C_evict_tagged_entries(H5F_t * f, hid_t dxpl_id, haddr_t tag, hbool_t match_gl
/* Keep doing this until we have stopped evicted entries */
} while(TRUE == ctx.evicted_entries_last_pass);
- /* Fail if we have finished evicting entries and pinned entries still need evicted */
- if(ctx.pinned_entries_need_evicted)
+ /* In most cases, fail if we have finished evicting entries and pinned
+ * entries still need evicted
+ *
+ * However, things can get strange if the file was opened R/O and
+ * the file contains a cache image and the cache image contains dirty
+ * entries.
+ *
+ * Since the file was opened read only, dirty entries in the cache
+ * image were marked as clean when they were inserted into the metadata
+ * cache. This is necessary, as if they are marked dirty, the metadata
+ * cache will attempt to write them on file close, which is frowned
+ * upon when the file is opened R/O.
+ *
+ * On the other hand, such entries (marked prefetched_dirty) must not
+ * be evicted, as should the cache be asked to re-load them, the cache
+ * will attempt to read them from the file, and at best load an outdated
+ * version.
+ *
+ * To avoid this, H5C__evict_tagged_entries_cb has been modified to
+ * skip such entries. However, by doing so, it may prevent pinned
+ * entries from becoming unpinned.
+ *
+ * Thus we must ignore ctx.pinned_entries_need_evicted if
+ * ctx.skipped_pf_dirty_entries is TRUE.
+ */
+ if((!ctx.skipped_pf_dirty_entries) && (ctx.pinned_entries_need_evicted))
HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Pinned entries still need evicted?!")
done: