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/* Benchmarks for the pagealign_alloc module.
Copyright (C) 2025 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* This benchmark focuses on the amount of allocated memory, in order
to minimize wasted memory. */
#include <config.h>
/* Specification. */
#include "pagealign_alloc.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "resource-ext.h"
static size_t pagesize;
/* Does a few pagealign_alloc invocations. */
static int
allocate_some_pages (void)
{
int i;
for (i = 1; i <= 9; i++)
if (pagealign_alloc (pagesize) == NULL)
return -1;
for (i = 1; i <= 2; i++)
if (pagealign_alloc (2 * pagesize) == NULL)
return -1;
for (i = 1; i <= 1; i++)
if (pagealign_alloc (3 * pagesize) == NULL)
return -1;
return 0;
}
/* Returns the total size requested by allocate_some_pages (). */
static size_t
size_of_some_pages (void)
{
return 16 * pagesize;
}
static void
show_stats (intptr_t initial_as, intptr_t initial_data, int count)
{
if (count == 0)
printf ("Allocation failed.\n");
else
{
intptr_t requested = count * size_of_some_pages ();
intptr_t as_increase = get_rusage_as () - initial_as;
intptr_t data_increase = get_rusage_data () - initial_data;
printf ("count = %5d: requested: %6ld pages, "
"allocated AS: %6ld pages (%.2f%%), "
"allocated DATA: %6ld pages (%.2f%%)\n",
count,
(long int) (requested / pagesize),
(long int) (as_increase / pagesize),
100 * (double) as_increase / (double) requested,
(long int) (data_increase / pagesize),
100 * (double) data_increase / (double) requested);
}
}
static void
do_test (void)
{
intptr_t initial_as = get_rusage_as ();
intptr_t initial_data = get_rusage_data ();
int count;
for (count = 0; count <= 10000; count++)
{
if (count == 10 || count == 30 || count == 90 || count == 270
|| count == 810 || count == 2430 || count == 7290)
show_stats (initial_as, initial_data, count);
if (allocate_some_pages () < 0)
break;
}
show_stats (initial_as, initial_data, count);
}
int
main (int argc, char *argv[])
{
if (argc != 2)
{
fprintf (stderr, "Usage: %s TESTS\n", argv[0]);
fprintf (stderr, "Example: %s {a|b|c|d|e|f}\n", argv[0]);
exit (1);
}
const char *tests = argv[1];
pagesize = getpagesize ();
/* Execute each test. */
size_t i;
for (i = 0; i < strlen (tests); i++)
{
char test = tests[i];
switch (test)
{
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
pagealign_impl = test - 'a';
do_test ();
break;
default:
/* Ignore. */
;
}
}
return 0;
}
/* Results:
b c d e f
glibc 176% 101% 175% --- ---
musl libc 198% 101% 197% --- ---
macOS 190% 100% 195% --- ---
FreeBSD 190% 100% 380% --- ---
NetBSD 185% 101% 379% --- ---
OpenBSD 177% 101% 101% --- ---
AIX 177% 101% 176% --- ---
Solaris 11.4 176% 101% 175% --- ---
Cygwin 181% 100% 181% --- ---
native Windows 184% --- --- 180% 100%
Android 182% 101% 181% --- ---
*/
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