/*
* Copyright 2016-2018, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* obj_fragmentation.c -- measures average heap fragmentation
*
* A pretty simplistic test that measures internal fragmentation of the
* allocator for the given size.
*/
#include <stdlib.h>
#include "unittest.h"
#define LAYOUT_NAME "obj_fragmentation"
#define OBJECT_OVERHEAD 64 /* account for the header added to each object */
#define MAX_OVERALL_OVERHEAD 0.10f
/*
* For the best accuracy fragmentation should be measured for one full zone
* because the metadata is preallocated. For reasonable test duration a smaller
* size must be used.
*/
#define DEFAULT_FILE_SIZE ((size_t)(1ULL << 28)) /* 256 megabytes */
int
main(int argc, char *argv[])
{
START(argc, argv, "obj_fragmentation");
if (argc < 3)
UT_FATAL("usage: %s allocsize filename [filesize]", argv[0]);
size_t file_size;
if (argc == 4)
file_size = ATOUL(argv[3]);
else
file_size = DEFAULT_FILE_SIZE;
size_t alloc_size = ATOUL(argv[1]);
const char *path = argv[2];
PMEMobjpool *pop = pmemobj_create(path, LAYOUT_NAME, file_size,
S_IWUSR | S_IRUSR);
if (pop == NULL)
UT_FATAL("!pmemobj_create: %s", path);
size_t allocated = 0;
int err = 0;
do {
PMEMoid oid;
err = pmemobj_alloc(pop, &oid, alloc_size, 0, NULL, NULL);
if (err == 0)
allocated += pmemobj_alloc_usable_size(oid) +
OBJECT_OVERHEAD;
} while (err == 0);
float allocated_pct = ((float)allocated / file_size);
float overhead_pct = 1.f - allocated_pct;
UT_ASSERT(overhead_pct <= MAX_OVERALL_OVERHEAD);
pmemobj_close(pop);
DONE(NULL);
}