path: root/test/page_buffer.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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 COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/***********************************************************
*
* Test program:	 cache_page_buffer
*
* Tests the Page Buffer Feature.
*
*************************************************************/

#include "h5test.h"

#include "H5CXprivate.h"        /* API Contexts                         */
#include "H5Iprivate.h"
#include "H5PBprivate.h"
#include "H5VLprivate.h"        /* Virtual Object Layer                     */

/*
 * This file needs to access private information from the H5F package.
 */
#define H5MF_FRIEND		/*suppress error about including H5MFpkg	  */
#include "H5MFpkg.h"

#define H5F_FRIEND		/*suppress error about including H5Fpkg	  */
#define H5F_TESTING
#include "H5Fpkg.h"


#define FILENAME_LEN            1024
#define NUM_DSETS               5
#define NX                      100
#define NY                      50

/* helper routines */
static unsigned create_file(char *filename, hid_t fcpl, hid_t fapl);
static unsigned open_file(char *filename, hid_t fapl, hsize_t page_size, size_t page_buffer_size);

/* test routines */
static unsigned test_args(hid_t fapl, const char *env_h5_drvr);
static unsigned test_raw_data_handling(hid_t orig_fapl, const char *env_h5_drvr);
static unsigned test_lru_processing(hid_t orig_fapl, const char *env_h5_drvr);
static unsigned test_min_threshold(hid_t orig_fapl, const char *env_h5_drvr);
static unsigned test_stats_collection(hid_t orig_fapl, const char *env_h5_drvr);
#ifdef H5_HAVE_PARALLEL
static unsigned verify_page_buffering_disabled(hid_t orig_fapl, 
    const char *env_h5_drvr);
#endif /* H5_HAVE_PARALLEL */

const char *FILENAME[] = {
    "filepaged",
    NULL
};


/*-------------------------------------------------------------------------
 * Function:    create_file()
 *
 * Purpose:     The purpose of this function appears to be a smoke check
 *              intended to exercise the page buffer.
 *
 *              Specifically, the function creates a file, and then goes 
 *              through a loop in which it creates four data sets, write 
 *              data to one of them, verifies the data written, and then 
 *              deletes the three that it didn't write to.
 *
 *              Any data mis-matches or failures reported by the HDF5
 *              library result in test failure.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *
 *-------------------------------------------------------------------------
 */
static unsigned
create_file(char *filename, hid_t fcpl, hid_t fapl)
{
    hid_t       file_id = -1;
    hid_t       dset_id = -1;
    hid_t       grp_id = -1;
    hid_t       filespace = -1;
    hsize_t     dimsf[2] = {NX, NY};       /* dataset dimensions */
    int         *data = NULL;                     /* pointer to data buffer to write */
    hid_t       dcpl = -1;
    int         i;
    int         num_elements;
    int         j;
    char        dset_name[32];

    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;

    if((grp_id = H5Gcreate2(file_id, "GROUP", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        FAIL_STACK_ERROR;

    num_elements  = NX * NY;
    if((data = (int *)HDcalloc((size_t)num_elements, sizeof(int))) == NULL)
        TEST_ERROR
    for (i=0; i < (int)num_elements; i++)
        data[i] = i;

    if((filespace = H5Screate_simple(2, dimsf, NULL)) < 0)
        FAIL_STACK_ERROR;

    if((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
       FAIL_STACK_ERROR;
    if(H5Pset_alloc_time(dcpl, H5D_ALLOC_TIME_EARLY) < 0)
        FAIL_STACK_ERROR;

    for(i=0 ; i<NUM_DSETS; i++) {

        HDsprintf(dset_name, "D1dset%d", i);
        if((dset_id = H5Dcreate2(grp_id, dset_name, H5T_NATIVE_INT, filespace,
                                 H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
            FAIL_STACK_ERROR;
        if(H5Dclose(dset_id) < 0)
            FAIL_STACK_ERROR;

        HDsprintf(dset_name, "D2dset%d", i);
        if((dset_id = H5Dcreate2(grp_id, dset_name, H5T_NATIVE_INT, filespace,
                                 H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
            FAIL_STACK_ERROR;
        if(H5Dclose(dset_id) < 0)
            FAIL_STACK_ERROR;

        HDsprintf(dset_name, "D3dset%d", i);
        if((dset_id = H5Dcreate2(grp_id, dset_name, H5T_NATIVE_INT, filespace,
                                 H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
            FAIL_STACK_ERROR;
        if(H5Dclose(dset_id) < 0)
            FAIL_STACK_ERROR;

        HDsprintf(dset_name, "dset%d", i);
        if((dset_id = H5Dcreate2(grp_id, dset_name, H5T_NATIVE_INT, filespace,
                                 H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
            FAIL_STACK_ERROR;

        if(H5Dwrite(dset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data) < 0)
            FAIL_STACK_ERROR;
        if(H5Dclose(dset_id) < 0)
            FAIL_STACK_ERROR;

        HDmemset(data, 0, (size_t)num_elements * sizeof(int));
        if((dset_id = H5Dopen2(grp_id, dset_name, H5P_DEFAULT)) < 0)
            FAIL_STACK_ERROR;        
        if(H5Dread(dset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data) < 0)
            FAIL_STACK_ERROR;
        if(H5Dclose(dset_id) < 0)
            FAIL_STACK_ERROR;

        for (j=0; j < num_elements; j++) {
            if(data[j] != j) {
                HDfprintf(stderr, "Read different values than written\n");
                FAIL_STACK_ERROR;
            }
        }

        HDsprintf(dset_name, "D1dset%d", i);
        if(H5Ldelete(grp_id, dset_name, H5P_DEFAULT) < 0)
            FAIL_STACK_ERROR;
        HDsprintf(dset_name, "D2dset%d", i);
        if(H5Ldelete(grp_id, dset_name, H5P_DEFAULT) < 0)
            FAIL_STACK_ERROR;
        HDsprintf(dset_name, "D3dset%d", i);
        if(H5Ldelete(grp_id, dset_name, H5P_DEFAULT) < 0)
            FAIL_STACK_ERROR;
    }

    if(H5Gclose(grp_id) < 0)
        FAIL_STACK_ERROR;
    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(dcpl) < 0)
        FAIL_STACK_ERROR;
    if(H5Sclose(filespace) < 0)
        FAIL_STACK_ERROR;

    HDfree(data);
    return 0;

error:
    H5E_BEGIN_TRY {
        H5Pclose(dcpl);
        H5Sclose(filespace);
        H5Gclose(grp_id);
        H5Fclose(file_id);
        if(data)
            HDfree(data);
    } H5E_END_TRY;
    return(1);
} /* create_file */


/*-------------------------------------------------------------------------
 * Function:    open_file()
 *
 * Purpose:     The purpose of this function appears to be a smoke check
 *              intended to exercise the page buffer.
 *
 *              Specifically, the function opens a file (created by 
 *              create_file()?), and verify the contents of its datasets.
 *
 *              Any data mis-matches or failures reported by the HDF5
 *              library result in test failure.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *
 *-------------------------------------------------------------------------
 */
static unsigned
open_file(char *filename, hid_t fapl, hsize_t page_size, 
    size_t page_buffer_size)
{
    hid_t       file_id = -1;
    hid_t       dset_id = -1;
    hid_t       grp_id = -1;
    int         *data = NULL;                    /* pointer to data buffer to write */
    int         i;
    int         j;
    int         num_elements;
    char        dset_name[32];
    H5F_t       *f = NULL;

    if((file_id = H5Fopen(filename, H5F_ACC_RDONLY, fapl)) < 0)
        FAIL_STACK_ERROR;

    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;

    if(f->shared->page_buf == NULL)
        FAIL_STACK_ERROR;
    if(f->shared->page_buf->page_size != page_size)
        FAIL_STACK_ERROR;
    if(f->shared->page_buf->max_size != page_buffer_size)
        FAIL_STACK_ERROR;

    if((grp_id = H5Gopen2(file_id, "GROUP", H5P_DEFAULT)) < 0)
        FAIL_STACK_ERROR;

    num_elements  = NX * NY;
    if((data = (int *)HDcalloc((size_t)num_elements, sizeof(int))) == NULL)
        TEST_ERROR

    for(i=0 ; i<NUM_DSETS; i++) {

        HDsprintf(dset_name, "dset%d", i);
        if((dset_id = H5Dopen2(grp_id, dset_name, H5P_DEFAULT)) < 0)
            FAIL_STACK_ERROR;

        if(H5Dread(dset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data) < 0)
            FAIL_STACK_ERROR;

        if(H5Dclose(dset_id) < 0)
            FAIL_STACK_ERROR;

        for (j=0; j < num_elements; j++) {
            if(data[j] != j) {
                HDfprintf(stderr, "Read different values than written\n");
                FAIL_STACK_ERROR;
            }
        }
    }

    if(H5Gclose(grp_id) < 0)
        FAIL_STACK_ERROR;
    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;
    HDfree(data);

    return 0;

error:
    H5E_BEGIN_TRY {
        H5Gclose(grp_id);
        H5Fclose(file_id);
        if(data)
            HDfree(data);
    } H5E_END_TRY;
    return 1;
}

/*
 *
 *  set_multi_split():
 *      Internal routine to set up page-aligned address space for multi/split driver
 *      when testing paged aggregation.
 *
 */
static unsigned
set_multi_split(const char *env_h5_drvr, hid_t fapl, hsize_t pagesize)
{
    hbool_t split = FALSE;
    hbool_t multi = FALSE;
    H5FD_mem_t memb_map[H5FD_MEM_NTYPES];
    hid_t memb_fapl_arr[H5FD_MEM_NTYPES];
    char *memb_name[H5FD_MEM_NTYPES];
    haddr_t memb_addr[H5FD_MEM_NTYPES];
    hbool_t relax;
    H5FD_mem_t  mt;

    /* Check for split or multi driver */
    if(!HDstrcmp(env_h5_drvr, "split"))
        split = TRUE;
    else if(!HDstrcmp(env_h5_drvr, "multi"))
        multi = TRUE;

    if(split || multi) {

        HDmemset(memb_name, 0, sizeof memb_name);

        /* Get current split settings */
        if(H5Pget_fapl_multi(fapl, memb_map, memb_fapl_arr, memb_name, memb_addr, &relax) < 0)
            TEST_ERROR

        if(split) {
            /* Set memb_addr aligned */
            memb_addr[H5FD_MEM_SUPER] = ((memb_addr[H5FD_MEM_SUPER] + pagesize - 1) / pagesize) * pagesize;
            memb_addr[H5FD_MEM_DRAW] = ((memb_addr[H5FD_MEM_DRAW] + pagesize - 1) / pagesize) * pagesize;
        } else {
            /* Set memb_addr aligned */
            for(mt = H5FD_MEM_DEFAULT; mt < H5FD_MEM_NTYPES; H5_INC_ENUM(H5FD_mem_t, mt))
                memb_addr[mt] = ((memb_addr[mt] + pagesize - 1) / pagesize) * pagesize;
        } /* end else */

        /* Set multi driver with new FAPLs */
        if(H5Pset_fapl_multi(fapl, memb_map, memb_fapl_arr, (const char * const *)memb_name, memb_addr, relax) < 0)
            TEST_ERROR

        /* Free memb_name */
        for(mt = H5FD_MEM_DEFAULT; mt < H5FD_MEM_NTYPES; H5_INC_ENUM(H5FD_mem_t, mt))
            free(memb_name[mt]);

    } /* end if */

    return 0;

error:
    return 1;

} /* set_multi_split() */


/*-------------------------------------------------------------------------
 * Function:    test_args()
 *
 * Purpose:     This test appears to be a quick smoke check directed at:
 *
 *              1) verifying that API errors are caught.
 *
 *              2) verifying that the page buffer behaves more or less 
 *                 as advertized.
 *
 *              Any data mis-matches or unexpected failures or successes
 *              reported by the HDF5 library result in test failure.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *
 *-------------------------------------------------------------------------
 */
static unsigned
test_args(hid_t orig_fapl, const char *env_h5_drvr)
{
    char filename[FILENAME_LEN]; /* Filename to use */
    hid_t file_id = -1;          /* File ID */
    hid_t fcpl = -1;
    hid_t fapl = -1;
    herr_t ret;

    TESTING("Settings for Page Buffering");

    h5_fixname(FILENAME[0], orig_fapl, filename, sizeof(filename));

    if((fapl = H5Pcopy(orig_fapl)) < 0) TEST_ERROR

    if((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        TEST_ERROR;


    /* Test setting a page buffer without Paged Aggregation enabled - 
     * should fail 
     */
    if(H5Pset_page_buffer_size(fapl, 512, 0, 0) < 0)
        TEST_ERROR;

    H5E_BEGIN_TRY {
        file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl);
    } H5E_END_TRY;

    if(file_id >= 0)
        TEST_ERROR;


    /* Test setting a page buffer with a size smaller than a single 
     * page size - should fail 
     */
    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        TEST_ERROR;

    if(H5Pset_file_space_page_size(fcpl, 512) < 0)
        TEST_ERROR;

    if(H5Pset_page_buffer_size(fapl, 511, 0, 0) < 0)
        TEST_ERROR;

    H5E_BEGIN_TRY {
        file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl);
    } H5E_END_TRY;

    if(file_id >= 0)
        TEST_ERROR;


    /* Test setting a page buffer with sum of min meta and raw 
     * data percentage > 100 - should fail 
     */
    H5E_BEGIN_TRY {
        ret = H5Pset_page_buffer_size(fapl, 512, 50, 51);
    } H5E_END_TRY;

    if(ret >= 0)
        TEST_ERROR;

    if(set_multi_split(env_h5_drvr, fapl, 512)  != 0)
        TEST_ERROR;

    /* Test setting a page buffer with a size equal to a single page size */
    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        TEST_ERROR;

    if(H5Pset_file_space_page_size(fcpl, 512) < 0)
        TEST_ERROR;

    if(H5Pset_page_buffer_size(fapl, 512, 0, 0) < 0)
        TEST_ERROR;

    if(create_file(filename, fcpl, fapl) != 0)
        TEST_ERROR;

    if(open_file(filename, fapl, 512, 512) != 0)
        TEST_ERROR;


    /* Test setting a page buffer with a size slightly larger than a 
     * single page size 
     */
    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        TEST_ERROR;

    if(H5Pset_file_space_page_size(fcpl, 512) < 0)
        TEST_ERROR;

    if(H5Pset_page_buffer_size(fapl, 513, 0, 0) < 0)
        TEST_ERROR;

    if(create_file(filename, fcpl, fapl) != 0)
        TEST_ERROR;

    if(open_file(filename, fapl, 512, 512) != 0)
        TEST_ERROR;

    if(set_multi_split(env_h5_drvr, fapl, 4194304)  != 0)
        TEST_ERROR;


    /* Test setting a large page buffer size and page size */
    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        TEST_ERROR;

    if(H5Pset_file_space_page_size(fcpl, 4194304) < 0)
        TEST_ERROR;

    if(H5Pset_page_buffer_size(fapl, 16777216, 0, 0) < 0)
        TEST_ERROR;

    if(create_file(filename, fcpl, fapl) != 0)
        TEST_ERROR;

    if(open_file(filename, fapl, 4194304, 16777216) != 0)
        TEST_ERROR;

    if(set_multi_split(env_h5_drvr, fapl, 1)  != 0)
        TEST_ERROR;


    /* Test setting a 512 byte page buffer size and page size */
    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        TEST_ERROR;

    if(H5Pset_file_space_page_size(fcpl, 512) < 0)
        TEST_ERROR;
    if(H5Pset_page_buffer_size(fapl, 512, 0, 0) < 0)
        TEST_ERROR;
    if(create_file(filename, fcpl, fapl) != 0)
        TEST_ERROR;
    if(open_file(filename, fapl, 512, 512) != 0)
        TEST_ERROR;


    if(H5Pclose(fcpl) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(fapl) < 0)
        FAIL_STACK_ERROR;

    PASSED()
    return 0;

error:
    H5E_BEGIN_TRY {
        H5Pclose(fapl);
        H5Pclose(fcpl);
    } H5E_END_TRY;
    return 1;
} /* test_args */


/*-------------------------------------------------------------------------
 * Function:    test_raw_data_handling()
 *
 * Purpose:     The purpose of this function appears to be a smoke check
 *              of raw data reads and writes via the page buffer.
 *
 *              Any data mis-matches or failures reported by the HDF5
 *              library result in test failure.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *              
 * Changes:     Added base_page_cnt field as supporting code.  This allows
 *              the test to adjust to the number of page buffer pages
 *              accessed during file open / create.
 *
 *              The test for the value of base_page_cnt just after file 
 *              open exists detect changes in library behavior.  Assuming
 *              any such change is not indicative of other issues, these 
 *              tests can be modified to reflect the change.
 *
 *                                                    JRM -- 2/23/17
 *
 *-------------------------------------------------------------------------
 */

/* Changes due to file space page size has a minimum size of 512 */
static unsigned
test_raw_data_handling(hid_t orig_fapl, const char *env_h5_drvr)
{
    char filename[FILENAME_LEN]; /* Filename to use */
    hid_t file_id = -1;          /* File ID */
    hid_t fcpl = -1;
    hid_t fapl = -1;
    size_t base_page_cnt;
    size_t page_count = 0;
    int i, num_elements = 2000;
    haddr_t addr = HADDR_UNDEF;
    int *data = NULL;
    H5F_t *f = NULL;

    TESTING("Raw Data Handling");

    h5_fixname(FILENAME[0], orig_fapl, filename, sizeof(filename));

    if((fapl = H5Pcopy(orig_fapl)) < 0)
        TEST_ERROR

    if(set_multi_split(env_h5_drvr, fapl, sizeof(int)*200)  != 0)
        TEST_ERROR;

    if((data = (int *)HDcalloc((size_t)num_elements, sizeof(int))) == NULL)
        TEST_ERROR;

    if((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        TEST_ERROR;
    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        TEST_ERROR;
    if(H5Pset_file_space_page_size(fcpl, sizeof(int)*200) < 0)
        TEST_ERROR;
    if(H5Pset_page_buffer_size(fapl, sizeof(int)*2000, 0, 0) < 0)
        TEST_ERROR;

    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;

    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;

    /* opening the file inserts one or more pages into the page buffer.
     * Get the number of pages inserted, and verify that it is the 
     * the expected value.
     */
    base_page_cnt = H5SL_count(f->shared->page_buf->slist_ptr);
    if(base_page_cnt != 1)
        TEST_ERROR;

    /* allocate space for a 2000 elements */
    if(HADDR_UNDEF == (addr = H5MF_alloc(f, H5FD_MEM_DRAW, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    /* initialize all the elements to have a value of -1 */
    for(i=0 ; i<num_elements ; i++)
        data[i] = -1;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    /* update the first 50 elements to have values 0-49 - this will be
       a page buffer update with 1 page resulting in the page
       buffer. */
    /* Changes: 100 */
    for(i=0 ; i<100 ; i++)
        data[i] = i;

    if(H5F_block_write(f, H5FD_MEM_DRAW, addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    page_count ++;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        FAIL_STACK_ERROR;

    /* update elements 300 - 450, with values 300 -  - this will
       bring two more pages into the page buffer. */
    for(i=0 ; i<150 ; i++)
        data[i] = i+300;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*300), sizeof(int)*150, data) < 0)
        FAIL_STACK_ERROR;
    page_count += 2;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        FAIL_STACK_ERROR;

    /* update elements 100 - 300, this will go to disk but also update
       existing pages in the page buffer. */
    for(i=0 ; i<200 ; i++)
        data[i] = i+100;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*100), sizeof(int)*200, data) < 0)
        FAIL_STACK_ERROR;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        FAIL_STACK_ERROR;

    /* Update elements 225-300 - this will update an existing page in the PB */
    /* Changes: 450 - 600; 150 */
    for(i=0 ; i<150 ; i++)
        data[i] = i+450;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*450), sizeof(int)*150, data) < 0)
        FAIL_STACK_ERROR;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        FAIL_STACK_ERROR;

    /* Do a full page write to block 600-800 - should bypass the PB */
    for(i=0 ; i<200 ; i++)
        data[i] = i+600;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*600), sizeof(int)*200, data) < 0)
        FAIL_STACK_ERROR;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        FAIL_STACK_ERROR;

    /* read elements 800 - 1200, this should not affect the PB, and should read -1s */
    if(H5F_block_read(f, H5FD_MEM_DRAW, addr+(sizeof(int)*800), sizeof(int)*400, data) < 0)
        FAIL_STACK_ERROR;
    for (i=0; i < 400; i++) {
        if(data[i] != -1) {
            HDfprintf(stderr, "Read different values than written\n");
            FAIL_STACK_ERROR;
        }
    }
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        FAIL_STACK_ERROR;

    /* read elements 1200 - 1201, this should read -1 and bring in an 
     * entire page of addr 1200 
     */
    if(H5F_block_read(f, H5FD_MEM_DRAW, addr+(sizeof(int)*1200), sizeof(int)*1, data) < 0)
        FAIL_STACK_ERROR;
    for (i=0; i < 1; i++) {
        if(data[i] != -1) {
            HDfprintf(stderr, "Read different values than written\n");
            TEST_ERROR;
        }
    }
    page_count ++;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        TEST_ERROR;

    /* read elements 175 - 225, this should use the PB existing pages */
    /* Changes: 350 - 450 */
    /* read elements 175 - 225, this should use the PB existing pages */
    if(H5F_block_read(f, H5FD_MEM_DRAW, addr+(sizeof(int)*350), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;
    for (i=0; i < 100; i++) {
        if(data[i] != i+350) {
            HDfprintf(stderr, "Read different values than written\n");
            TEST_ERROR;
        }
    }
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        TEST_ERROR;

    /* read elements 0 - 800 using the VFD.. this should result in -1s
       except for the writes that went through the PB (100-300 & 600-800) */
    if(H5FD_read(f->shared->lf, H5FD_MEM_DRAW, addr, sizeof(int)*800, data) < 0)
        FAIL_STACK_ERROR;
    i = 0;
    while (i < 800) {
        if((i>=100 && i<300) || (i>=600)) {
            if(data[i] != i) {
                HDfprintf(stderr, "Read different values than written\n");
                TEST_ERROR;
            }
        }
        else {
            if(data[i] != -1) {
                HDfprintf(stderr, "Read different values than written\n");
                TEST_ERROR;
            }
        }
        i++;
    }

    /* read elements 0 - 800 using the PB.. this should result in all
     * what we have written so far and should get the updates from the PB 
     */
    if(H5F_block_read(f, H5FD_MEM_DRAW, addr, sizeof(int)*800, data) < 0)
        FAIL_STACK_ERROR;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        TEST_ERROR;
    for (i=0; i < 800; i++) {
        if(data[i] != i) {
            HDfprintf(stderr, "Read different values than written\n");
            TEST_ERROR;
        }
    }

    /* update elements 400 - 1400 to value 0, this will go to disk but
     * also evict existing pages from the PB (page 400 & 1200 that are
     * existing). 
     */
    for(i=0 ; i<1000 ; i++)
        data[i] = 0;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*400), sizeof(int)*1000, data) < 0)
        FAIL_STACK_ERROR;
    page_count -= 2;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        TEST_ERROR;

    /* read elements 0 - 1000.. this should go to disk then update the
     * buffer result 200-400 with existing pages
     */
    if(H5F_block_read(f, H5FD_MEM_DRAW, addr, sizeof(int)*1000, data) < 0)
        FAIL_STACK_ERROR;
    i=0;
    while (i < 1000) {
        if(i<400) {
            if(data[i] != i) {
                HDfprintf(stderr, "Read different values than written\n");
                TEST_ERROR;
            }
        }
        else {
            if(data[i] != 0) {
                HDfprintf(stderr, "Read different values than written\n");
                TEST_ERROR;
            }
        }
        i++;
    }
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        TEST_ERROR;

    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(fcpl) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(fapl) < 0)
        FAIL_STACK_ERROR;
    HDfree(data);

    PASSED()
    return 0;

error:
    H5E_BEGIN_TRY {
        H5Pclose(fapl);
        H5Pclose(fcpl);
        H5Fclose(file_id);
        if(data)
            HDfree(data);
    } H5E_END_TRY;
    return 1;
} /* test_raw_data_handling */


/*-------------------------------------------------------------------------
 * Function:    test_lru_processing()
 *
 * Purpose:     Basic set of tests verifying expected page buffer LRU
 *              management.
 *
 *              Any data mis-matches or failures reported by the HDF5
 *              library result in test failure.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *              
 * Changes:     Added base_page_cnt field as supporting code.  This allows
 *              the test to adjust to the number of page buffer pages
 *              accessed during file open / create.
 *
 *              The test for the value of base_page_cnt just after file 
 *              open exists detect changes in library behavior.  Assuming
 *              any such change is not indicative of other issues, these 
 *              tests can be modified to reflect the change.
 *
 *                                                    JRM -- 2/23/17
 *
 *
 *-------------------------------------------------------------------------
 */

static unsigned
test_lru_processing(hid_t orig_fapl, const char *env_h5_drvr)
{
    char filename[FILENAME_LEN]; /* Filename to use */
    hid_t file_id = -1;          /* File ID */
    hid_t fcpl = -1;
    hid_t fapl = -1;
    size_t base_page_cnt;
    size_t page_count = 0;
    int i;
    int num_elements = 2000;
    haddr_t addr = HADDR_UNDEF;
    haddr_t search_addr = HADDR_UNDEF;
    int *data = NULL;
    H5F_t *f = NULL;

    TESTING("LRU Processing");

    h5_fixname(FILENAME[0], orig_fapl, filename, sizeof(filename));

    if((fapl = H5Pcopy(orig_fapl)) < 0)
        FAIL_STACK_ERROR

    if(set_multi_split(env_h5_drvr, fapl, sizeof(int)*200)  != 0)
        TEST_ERROR;

    if((data = (int *)HDcalloc((size_t)num_elements, sizeof(int))) == NULL)
        TEST_ERROR;

    if((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_page_size(fcpl, sizeof(int)*200) < 0)
        FAIL_STACK_ERROR;

    /* keep 2 pages at max in the page buffer */
    if(H5Pset_page_buffer_size(fapl, sizeof(int)*400, 20, 0) < 0)
        FAIL_STACK_ERROR;

    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;

    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;

    /* opening the file inserts one or more pages into the page buffer.
     * Get the number of pages inserted, and verify that it is the 
     * the expected value.
     */
    base_page_cnt = H5SL_count(f->shared->page_buf->slist_ptr);
    if(base_page_cnt != 1)
        TEST_ERROR;

    /* allocate space for a 2000 elements */
    if(HADDR_UNDEF == (addr = H5MF_alloc(f, H5FD_MEM_DRAW, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    /* initialize all the elements to have a value of -1 */
    for(i=0 ; i<num_elements ; i++)
        data[i] = -1;

    if(H5F_block_write(f, H5FD_MEM_DRAW, addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    /* update the first 100 elements to have values 0-99 - this will be
     * a page buffer update with 1 page resulting in the page
     * buffer. 
     */
    for(i=0 ; i<100 ; i++)
        data[i] = i;

    if(H5F_block_write(f, H5FD_MEM_DRAW, addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    page_count ++;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count + base_page_cnt)
        TEST_ERROR;

    /* update elements 300 - 450, with values 300 - 449 - this will
     * bring two pages into the page buffer and evict 0. 
     */
    for(i=0 ; i<150 ; i++)
        data[i] = i+300;

    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*300), sizeof(int)*150, data) < 0)
        FAIL_STACK_ERROR;

    page_count = 2;

    /* at this point, the page buffer entry created at file open should
     * have been evicted -- thus no further need to consider base_page_cnt.
     */
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    /* The two pages should be the ones with address 100 and 200; 0
       should have been evicted */
    /* Changes: 200, 400 */
    search_addr = addr;
    if(NULL != H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;
    search_addr = addr + sizeof(int)*200;
    if(NULL == H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;
    search_addr = addr + sizeof(int)*400;
    if(NULL == H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    /* update elements 150-151, this will update existing pages in the
       page buffer and move it to the top of the LRU. */
    /* Changes: 300 - 301 */
    for(i=0 ; i<1 ; i++)
        data[i] = i+300;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*300), sizeof(int)*1, data) < 0)
        FAIL_STACK_ERROR;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    /* read elements 600 - 601, this should read -1 and bring in an
       entire page of addr 600, and evict page 200 */
    /* Changes: 1200 - 1201; 1200, 400 */
    if(H5F_block_read(f, H5FD_MEM_DRAW, addr+(sizeof(int)*1200), sizeof(int)*1, data) < 0)
        FAIL_STACK_ERROR;
    for (i=0; i < 1; i++) {
        if(data[i] != -1) {
            HDfprintf(stderr, "Read different values than written\n");
            TEST_ERROR;
        } /* end if */
    } /* end for */
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    /* Changes: 400 */
    search_addr = addr + sizeof(int)*400;
    if(NULL != H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    /* Changes: 200 */
    search_addr = addr + sizeof(int)*200;
    if(NULL == H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    /* Changes: 1200 */
    search_addr = addr + sizeof(int)*1200;
    if(NULL == H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;
    /* read elements 175 - 225, this should move 100 to the top, evict 600 and bring in 200 */
    /* Changes: 350 - 450; 200, 1200, 400 */
    if(H5F_block_read(f, H5FD_MEM_DRAW, addr+(sizeof(int)*350), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;
    for (i=0; i < 100; i++) {
        if(data[i] != i+350) {
            HDfprintf(stderr, "Read different values than written\n");
            TEST_ERROR;
        } /* end if */
    } /* end for */
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    /* Changes: 1200 */
    search_addr = addr + sizeof(int)*1200;
    if(NULL != H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    /* Changes: 200 */
    search_addr = addr + sizeof(int)*200;
    if(NULL == H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    /* Changes: 400 */
    search_addr = addr + sizeof(int)*400;
    if(NULL == H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    /* update elements 200 - 700 to value 0, this will go to disk but
       also discarding existing pages from the PB (page 200). */
    /* Changes: 400 - 1400; 400 */
    for(i=0 ; i<1000 ; i++)
        data[i] = 0;
    if(H5F_block_write(f, H5FD_MEM_DRAW, addr+(sizeof(int)*400), sizeof(int)*1000, data) < 0)
        FAIL_STACK_ERROR;
    page_count -= 1;
    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    /* Changes: 200 */
    search_addr = addr + sizeof(int)*200;
    if(NULL == H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    /* Changes: 400 */
    search_addr = addr + sizeof(int)*400;
    if(NULL != H5SL_search(f->shared->page_buf->slist_ptr, &(search_addr)))
        FAIL_STACK_ERROR;

    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(fcpl) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(fapl) < 0)
        FAIL_STACK_ERROR;
    HDfree(data);

    PASSED()
    return 0;

error:
    H5E_BEGIN_TRY {
        H5Pclose(fapl);
        H5Pclose(fcpl);
        H5Fclose(file_id);
        if(data)
            HDfree(data);
    } H5E_END_TRY;
    return 1;
} /* test_lru_processing */


/*-------------------------------------------------------------------------
 * Function:    test_min_threshold()
 *
 * Purpose:     Tests verifying observation of minimum and maximum 
 *              raw and metadata page counts in the page buffer.
 *
 *              Any data mis-matches or failures reported by the HDF5
 *              library result in test failure.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *              
 * Changes:     Added the base_raw_cnt and base_meta_cnt fields and
 *              supporting code.  This allows the test to adjust to the 
 *              number of page buffer pages accessed during file open / 
 *              create.
 *
 *              The tests for the values of base_raw_cnt and base_meta_cnt
 *              just after file open exist detect changes in library 
 *              behavior.  Assuming any such change is not indicative of 
 *              other issues, these tests can be modified to reflect the 
 *              change.
 *
 *                                                    JRM -- 2/23/17
 *
 *-------------------------------------------------------------------------
 */

static unsigned
test_min_threshold(hid_t orig_fapl, const char *env_h5_drvr)
{
    char filename[FILENAME_LEN]; /* Filename to use */
    hid_t file_id = -1;          /* File ID */
    hid_t fcpl = -1;
    hid_t fapl = -1;
    size_t base_raw_cnt = 0;
    size_t base_meta_cnt = 0;
    size_t page_count = 0;
    int i;
    int num_elements = 1000;
    H5PB_t *page_buf;
    haddr_t meta_addr = HADDR_UNDEF;
    haddr_t raw_addr = HADDR_UNDEF;
    int *data = NULL;
    H5F_t *f = NULL;

    TESTING("Minimum Metadata threshold Processing");
    HDprintf("\n");
    h5_fixname(FILENAME[0], orig_fapl, filename, sizeof(filename));

    if((fapl = H5Pcopy(orig_fapl)) < 0)
        TEST_ERROR

    if(set_multi_split(env_h5_drvr, fapl, sizeof(int)*200)  != 0)
        TEST_ERROR;

    if((data = (int *)HDcalloc((size_t)num_elements, sizeof(int))) == NULL)
        TEST_ERROR;

    if((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_page_size(fcpl, sizeof(int)*200) < 0)
        FAIL_STACK_ERROR;

    HDprintf("\tMinimum metadata threshold = 100%%\n");

    /* keep 5 pages at max in the page buffer and 5 meta page minimum */
    if(H5Pset_page_buffer_size(fapl, sizeof(int)*1000, 100, 0) < 0)
        FAIL_STACK_ERROR;

    /* create the file */
    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;

    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;

    /* opening the file inserts one or more pages into the page buffer.
     * Get the raw and meta counts now, so we can adjust tests accordingly.
     */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->page_buf);

    base_raw_cnt = f->shared->page_buf->raw_count;
    base_meta_cnt = f->shared->page_buf->meta_count;

    if(base_raw_cnt != 0)
        TEST_ERROR;

    if(base_meta_cnt != 1)
        TEST_ERROR;

    page_buf = f->shared->page_buf;

    if(page_buf->min_meta_count != 5)
        TEST_ERROR;

    if(page_buf->min_raw_count != 0)
        TEST_ERROR;

    if(HADDR_UNDEF == (meta_addr = H5MF_alloc(f, H5FD_MEM_SUPER, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    if(HADDR_UNDEF == (raw_addr = H5MF_alloc(f, H5FD_MEM_DRAW, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    /* write all raw data, this would end up in page buffer since there 
     * is no metadata yet
     *
     * Not necessarily -- opening the file may may load a metadata page.
     */
    for(i=0 ; i<100 ; i++)
        data[i] = i;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    page_count += 5;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(page_buf->raw_count != 5 - base_meta_cnt)
        TEST_ERROR;

    /* write all meta data, this would end up in page buffer */
    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*200), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*400), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*600), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*800), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(page_buf->meta_count != 5)
        TEST_ERROR;

    if(page_buf->raw_count != 0)
        TEST_ERROR;

    /* write and read more raw data and make sure that they don't end up in
     * page buffer since the minimum metadata is actually the entire
     * page buffer 
     */
    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*350), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*500), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*750), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*900), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(page_buf->meta_count != 5)
        TEST_ERROR;

    if(page_buf->raw_count != 0)
        TEST_ERROR;

    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;


    HDprintf("\tMinimum raw data threshold = 100%%\n");

    page_count = 0;

    /* keep 5 pages at max in the page buffer and 5 raw page minimum */
    /* Changes: 1000 */
    if(H5Pset_page_buffer_size(fapl, sizeof(int)*1000, 0, 100) < 0)
        TEST_ERROR;

    /* create the file */
    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;

    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;

    /* opening the file inserts one or more pages into the page buffer.
     * Get the raw and meta counts now, so we can adjust tests accordingly.
     */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->page_buf);

    base_raw_cnt = f->shared->page_buf->raw_count;
    base_meta_cnt = f->shared->page_buf->meta_count;

    if(base_raw_cnt != 0)
        TEST_ERROR;

    if(base_meta_cnt != 1)
        TEST_ERROR;

    page_buf = f->shared->page_buf;

    if(page_buf->min_meta_count != 0)
        TEST_ERROR;
    if(page_buf->min_raw_count != 5)
        FAIL_STACK_ERROR;

    if(HADDR_UNDEF == (meta_addr = H5MF_alloc(f, H5FD_MEM_SUPER, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    if(HADDR_UNDEF == (raw_addr = H5MF_alloc(f, H5FD_MEM_DRAW, sizeof(int)*(size_t)num_elements)))
        TEST_ERROR;

    /* write all meta data, this would end up in page buffer since there 
     * is no raw data yet
     */
    for(i=0 ; i<100 ; i++)
        data[i] = i;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    page_count += 5;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;
    if(page_buf->meta_count != 5 - base_raw_cnt)
        TEST_ERROR;

    /* write/read all raw data, this would end up in page buffer */
    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(page_buf->raw_count != 5)
        TEST_ERROR;

    if(page_buf->meta_count != 0)
        TEST_ERROR;

    /* write and read more meta data and make sure that they don't end up in
     * page buffer since the minimum metadata is actually the entire
     * page buffer 
     */
    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*100), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*350), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*500), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*750), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*900), sizeof(int)*50, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(page_buf->raw_count != 5)
        TEST_ERROR;

    if(page_buf->meta_count != 0)
        TEST_ERROR;

    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;


    HDprintf("\tMinimum metadata threshold = 40%%, Minimum rawdata threshold = 40%%\n");
    page_count = 0;
    /* keep 5 pages at max in the page buffer 2 meta pages, 2 raw pages  
     * minimum 
     */
    if(H5Pset_page_buffer_size(fapl, sizeof(int)*1000, 40, 40) < 0)
        TEST_ERROR;

    /* create the file */
    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;

    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;

    /* opening the file inserts one or more pages into the page buffer.
     *
     * However, with the current 1 metadata page inserted into the 
     * the page buffer, it is not necessary to track the base raw and 
     * metadata entry counts.
     */

    if(base_raw_cnt != 0)
        TEST_ERROR;

    if(base_meta_cnt != 1)
        TEST_ERROR;
    page_buf = f->shared->page_buf;

    if(page_buf->min_meta_count != 2)
        TEST_ERROR;

    if(page_buf->min_raw_count != 2)
        TEST_ERROR;

    if(HADDR_UNDEF == (meta_addr = H5MF_alloc(f, H5FD_MEM_SUPER, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    if(HADDR_UNDEF == (raw_addr = H5MF_alloc(f, H5FD_MEM_DRAW, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    /* initialize all the elements to have a value of -1 */
    for(i=0 ; i<num_elements ; i++)
        data[i] = -1;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    /* fill the page buffer with raw data */
    for(i=0 ; i<100 ; i++)
        data[i] = i;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    page_count += 5;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 5 - base_meta_cnt)
        TEST_ERROR;

    /* add 3 meta entries evicting 3 raw entries */
    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 3)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 2)
        TEST_ERROR;

    /* adding more meta entires should replace meta entries since raw data 
     * is at its minimum 
     */
    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 3)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 2)
        TEST_ERROR;

    /* bring existing raw entires up the LRU */
    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*750), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    /* adding 2 raw entries (even with 1 call) should only evict 1 meta 
     * entry and another raw entry 
     */
    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*350), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 2)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 3)
        TEST_ERROR;

    /* adding 2 meta entries should replace 2 entires at the bottom of the LRU */
    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*98), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*242), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 2)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 3)
        TEST_ERROR;

    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;

    HDprintf("\tMinimum metadata threshold = 20%%\n");
    page_count = 0;
    /* keep 5 pages at max in the page buffer and 1 meta page minimum */
    if(H5Pset_page_buffer_size(fapl, sizeof(int)*1000, 39, 0) < 0)
        TEST_ERROR;
    /* create the file */
    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;
    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;
    page_buf = f->shared->page_buf;

    if(page_buf->min_meta_count != 1)
        TEST_ERROR;
    if(page_buf->min_raw_count != 0)
        TEST_ERROR;

    if(HADDR_UNDEF == (meta_addr = H5MF_alloc(f, H5FD_MEM_SUPER, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    if(HADDR_UNDEF == (raw_addr = H5MF_alloc(f, H5FD_MEM_DRAW, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    /* initialize all the elements to have a value of -1 */
    for(i=0 ; i<num_elements ; i++)
        data[i] = -1;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    /* fill the page buffer with raw data */
    for(i=0 ; i<100 ; i++)
        data[i] = i;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    page_count += 5;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    /* add 2 meta entries evicting 2 raw entries */
    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 2)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 3)
        TEST_ERROR;

    /* bring the rest of the raw entries up the LRU */
    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*500), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*700), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*900), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    /* write one more raw entry which replace one meta entry */
    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*100), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 1)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 4)
        TEST_ERROR;

    /* write one more raw entry which should replace another raw entry 
     * keeping min threshold of meta entries 
     */
    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*300), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 1)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 4)
        TEST_ERROR;

    /* write a metadata entry that should replace the metadata entry 
     * at the bottom of the LRU 
     */
    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*500), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5SL_count(f->shared->page_buf->slist_ptr) != page_count)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->meta_count != 1)
        TEST_ERROR;

    if(f->shared->page_buf->raw_count != 4)
        TEST_ERROR;

    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;

    if(H5Pclose(fcpl) < 0)
        FAIL_STACK_ERROR;

    if(H5Pclose(fapl) < 0)
        FAIL_STACK_ERROR;

    HDfree(data);

    PASSED()

    return 0;

error:

    H5E_BEGIN_TRY {
        H5Pclose(fapl);
        H5Pclose(fcpl);
        H5Fclose(file_id);
        if(data)
            HDfree(data);
    } H5E_END_TRY;

    return 1;

} /* test_min_threshold */


/*-------------------------------------------------------------------------
 * Function:    test_stats_collection()
 *
 * Purpose:     Tests verifying correct collection of statistics
 *              by the page buffer.
 *
 *              Any data mis-matches or failures reported by the HDF5
 *              library result in test failure.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *              
 * Changes:     Added the base_raw_cnt and base_meta_cnt fields and
 *              supporting code.  This allows the test to adjust to the 
 *              number of page buffer pages accessed during file open / 
 *              create.
 *
 *              The tests for the values of base_raw_cnt and base_meta_cnt
 *              just after file open exist detect changes in library 
 *              behavior.  Assuming any such change is not indicative of 
 *              other issues, these tests can be modified to reflect the 
 *              change.
 *
 *                                                    JRM -- 2/23/17
 *
 *-------------------------------------------------------------------------
 */
static unsigned
test_stats_collection(hid_t orig_fapl, const char *env_h5_drvr)
{
    char filename[FILENAME_LEN]; /* Filename to use */
    hid_t file_id = -1;          /* File ID */
    hid_t fcpl = -1;
    hid_t fapl = -1;
    int i;
    int num_elements = 1000;
    size_t base_raw_cnt = 0;
    size_t base_meta_cnt = 0;
    haddr_t meta_addr = HADDR_UNDEF;
    haddr_t raw_addr = HADDR_UNDEF;
    int *data = NULL;
    H5F_t *f = NULL;

    TESTING("Statistics Collection");

    h5_fixname(FILENAME[0], orig_fapl, filename, sizeof(filename));

    if((fapl = H5Pcopy(orig_fapl)) < 0)
        TEST_ERROR

    if(set_multi_split(env_h5_drvr, fapl, sizeof(int)*200)  != 0)
        TEST_ERROR;

    if((data = (int *)HDcalloc((size_t)num_elements, sizeof(int))) == NULL)
        TEST_ERROR

    if((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        TEST_ERROR;

    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        TEST_ERROR;

    if(H5Pset_file_space_page_size(fcpl, sizeof(int)*200) < 0)
        TEST_ERROR;

    /* keep 5 pages at max in the page buffer */
    if(H5Pset_page_buffer_size(fapl, sizeof(int)*1000, 20, 0) < 0)
        TEST_ERROR;

    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
        FAIL_STACK_ERROR;

    /* Get a pointer to the internal file object */
    if(NULL == (f = (H5F_t *)H5VL_object(file_id)))
        FAIL_STACK_ERROR;

    /* opening the file inserts one or more pages into the page buffer.
     * Get the raw and meta counts now, so we can adjust the expected 
     * statistics accordingly.
     */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->page_buf);

    base_raw_cnt = f->shared->page_buf->raw_count;
    base_meta_cnt = f->shared->page_buf->meta_count;

    if(base_raw_cnt != 0)
        TEST_ERROR;

    if(base_meta_cnt != 1)
        TEST_ERROR;

    /* reset statistics before we begin the tests */
    if(H5Freset_page_buffering_stats(file_id) < 0)
        FAIL_STACK_ERROR;

    if(HADDR_UNDEF == (meta_addr = H5MF_alloc(f, H5FD_MEM_SUPER, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;

    if(HADDR_UNDEF == (raw_addr = H5MF_alloc(f, H5FD_MEM_DRAW, sizeof(int)*(size_t)num_elements)))
        FAIL_STACK_ERROR;


    /* initialize all the elements to have a value of -1 */
    for(i=0 ; i<num_elements ; i++)
        data[i] = -1;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*(size_t)num_elements, data) < 0)
        FAIL_STACK_ERROR;

    for(i=0 ; i<200 ; i++)
        data[i] = i;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*500), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*700), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*900), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*400), sizeof(int)*200, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*100), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*300), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_write(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*800), sizeof(int)*182, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr, sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*200), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*600), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_DRAW, raw_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*400), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*600), sizeof(int)*200, data) < 0)
        FAIL_STACK_ERROR;

    if(H5F_block_read(f, H5FD_MEM_SUPER, meta_addr+(sizeof(int)*800), sizeof(int)*100, data) < 0)
        FAIL_STACK_ERROR;

    if(f->shared->page_buf->accesses[0] != 8)
        TEST_ERROR;
    if(f->shared->page_buf->accesses[1] != 16)
        TEST_ERROR;

    if(f->shared->page_buf->bypasses[0] != 3)
        TEST_ERROR;
    if(f->shared->page_buf->bypasses[1] != 1)
        TEST_ERROR;

    if(f->shared->page_buf->hits[0] != 0)
        TEST_ERROR;
    if(f->shared->page_buf->hits[1] != 4)
        TEST_ERROR;

    if(f->shared->page_buf->misses[0] != 8)
        TEST_ERROR;
    if(f->shared->page_buf->misses[1] != 11)
        TEST_ERROR;

    if(f->shared->page_buf->evictions[0] != 5 + base_meta_cnt)
        TEST_ERROR;
    if(f->shared->page_buf->evictions[1] != 9 + base_raw_cnt)
        TEST_ERROR;

    {
        unsigned accesses[2];
        unsigned hits[2];
        unsigned misses[2];
        unsigned evictions[2];
        unsigned bypasses[2];

        if(H5Fget_page_buffering_stats(file_id, accesses, hits, misses, evictions, bypasses) < 0)
            FAIL_STACK_ERROR;

        if(accesses[0] != 8)
            TEST_ERROR;
        if(accesses[1] != 16)
            TEST_ERROR;
        if(bypasses[0] != 3)
            TEST_ERROR;
        if(bypasses[1] != 1)
            TEST_ERROR;
        if(hits[0] != 0)
            TEST_ERROR;
        if(hits[1] != 4)
            TEST_ERROR;
        if(misses[0] != 8)
            TEST_ERROR;
        if(misses[1] != 11)
            TEST_ERROR;
        if(evictions[0] != 5 + base_meta_cnt)
            TEST_ERROR;
        if(evictions[1] != 9 + base_raw_cnt)
            TEST_ERROR;

        if(H5Freset_page_buffering_stats(file_id) < 0)
            FAIL_STACK_ERROR;
        if(H5Fget_page_buffering_stats(file_id, accesses, hits, misses, evictions, bypasses) < 0)
            FAIL_STACK_ERROR;

        if(accesses[0] != 0)
            TEST_ERROR;
        if(accesses[1] != 0)
            TEST_ERROR;
        if(bypasses[0] != 0)
            TEST_ERROR;
        if(bypasses[1] != 0)
            TEST_ERROR;
        if(hits[0] != 0)
            TEST_ERROR;
        if(hits[1] != 0)
            TEST_ERROR;
        if(misses[0] != 0)
            TEST_ERROR;
        if(misses[1] != 0)
            TEST_ERROR;
        if(evictions[0] != 0)
            TEST_ERROR;
        if(evictions[1] != 0)
            TEST_ERROR;
    } /* end block */

    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(fcpl) < 0)
        FAIL_STACK_ERROR;
    if(H5Pclose(fapl) < 0)
        FAIL_STACK_ERROR;
    HDfree(data);


    PASSED()
    return 0;

error:
    H5E_BEGIN_TRY {
        H5Pclose(fapl);
        H5Pclose(fcpl);
        H5Fclose(file_id);
        if(data)
            HDfree(data);
    } H5E_END_TRY;

    return 1;
} /* test_stats_collection */


/*-------------------------------------------------------------------------
 * Function:    verify_page_buffering_disabled()
 *
 * Purpose:     This function should only be called in parallel 
 *              builds.
 *
 *              At present, page buffering should be disabled in parallel
 *              builds.  Verify this.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  John Mainzer
 *              03/21/17
 *              
 * Changes:     None.
 *
 *-------------------------------------------------------------------------
 */

#ifdef H5_HAVE_PARALLEL
static unsigned
verify_page_buffering_disabled(hid_t orig_fapl, const char *env_h5_drvr)
{
    char filename[FILENAME_LEN]; /* Filename to use */
    hid_t file_id = -1;          /* File ID */
    hid_t fcpl = -1;
    hid_t fapl = -1;

    TESTING("Page Buffering Disabled");
    h5_fixname(FILENAME[0], orig_fapl, filename, sizeof(filename));


    /* first, try to create a file with page buffering enabled */

    if((fapl = H5Pcopy(orig_fapl)) < 0)
        TEST_ERROR

    if(set_multi_split(env_h5_drvr, fapl, 4096)  != 0)
        TEST_ERROR;

    if((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_page_size(fcpl, 4096) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_page_buffer_size(fapl, 4096*8, 0, 0) < 0)
        FAIL_STACK_ERROR;

    /* try to create  the file -- should fail */
    H5E_BEGIN_TRY {
        file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl);
    } H5E_END_TRY;

    if(file_id >= 0)
        TEST_ERROR;

    /* now, create a file, close it, and then try to open it with page 
     * buffering enabled.
     */
    if((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
        FAIL_STACK_ERROR;

    if(H5Pset_file_space_page_size(fcpl, 4096) < 0)
        FAIL_STACK_ERROR;

    /* create the file */
    if((file_id = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, H5P_DEFAULT)) < 0)
        FAIL_STACK_ERROR;

    /* close the file */
    if(H5Fclose(file_id) < 0)
        FAIL_STACK_ERROR;

    /* try to open the file using the fapl prepared above which enables 
     * page buffering.  Should fail.
     */
    H5E_BEGIN_TRY {
        file_id = H5Fopen(filename, H5F_ACC_RDWR, fapl);
    } H5E_END_TRY;

    if(file_id >= 0)
        TEST_ERROR;

    if(H5Pclose(fcpl) < 0)
        FAIL_STACK_ERROR;

    if(H5Pclose(fapl) < 0)
        FAIL_STACK_ERROR;

    PASSED()

    return 0;

error:

    H5E_BEGIN_TRY {
        H5Pclose(fapl);
        H5Pclose(fcpl);
        H5Fclose(file_id);
    } H5E_END_TRY;

    return 1;

} /* verify_page_buffering_disabled() */
#endif /* H5_HAVE_PARALLEL */


/*-------------------------------------------------------------------------
 * Function:    main()
 *
 * Purpose:     Main function for the page buffer tests.
 *
 * Return:      0 if test is sucessful
 *              1 if test fails
 *
 * Programmer:  unknown
 *              ?? / ?? / ??
 *
 *-------------------------------------------------------------------------
 */
int
main(void)
{
    hid_t       fapl = -1;              /* File access property list for data files */
    unsigned    nerrors = 0;            /* Cumulative error count */
    const char  *env_h5_drvr = NULL;    /* File Driver value from environment */
    hbool_t     api_ctx_pushed = FALSE;             /* Whether API context pushed */

    h5_reset();

    /* Get the VFD to use */
    env_h5_drvr = HDgetenv("HDF5_DRIVER");
    if(env_h5_drvr == NULL)
        env_h5_drvr = "nomatch";

    /* Temporary skip testing with multi/split drivers:
     * Page buffering depends on paged aggregation which is
     * currently disabled for multi/split drivers.
     */
    if((0 == HDstrcmp(env_h5_drvr, "multi")) || 
       (0 == HDstrcmp(env_h5_drvr, "split"))) {

        SKIPPED()
        HDputs("Skip page buffering test because paged aggregation is disabled for multi/split drivers");
        HDexit(EXIT_SUCCESS);
    } /* end if */

    if((fapl = h5_fileaccess()) < 0) {
        nerrors++;
        PUTS_ERROR("Can't get VFD-dependent fapl")
    } /* end if */

    /* Push API context */
    if(H5CX_push() < 0) FAIL_STACK_ERROR
    api_ctx_pushed = TRUE;

#ifdef H5_HAVE_PARALLEL 

    HDputs("Page Buffering is disabled for parallel.");
    nerrors += verify_page_buffering_disabled(fapl, env_h5_drvr);

#else /* H5_HAVE_PARALLEL */

    nerrors += test_args(fapl, env_h5_drvr);
    nerrors += test_raw_data_handling(fapl, env_h5_drvr);
    nerrors += test_lru_processing(fapl, env_h5_drvr);
    nerrors += test_min_threshold(fapl, env_h5_drvr);
    nerrors += test_stats_collection(fapl, env_h5_drvr);

#endif /* H5_HAVE_PARALLEL */

    h5_clean_files(FILENAME, fapl);

    if(nerrors)
        goto error;

    /* Pop API context */
    if(api_ctx_pushed && H5CX_pop() < 0) FAIL_STACK_ERROR
    api_ctx_pushed = FALSE;

    HDputs("All Page Buffering tests passed.");

    HDexit(EXIT_SUCCESS);

error:
    HDprintf("***** %d Page Buffering TEST%s FAILED! *****\n",
        nerrors, nerrors > 1 ? "S" : "");

    H5E_BEGIN_TRY {
        H5Pclose(fapl);
    } H5E_END_TRY;

    if(api_ctx_pushed) H5CX_pop();

    HDexit(EXIT_FAILURE);
} /* main() */