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/* Benchmark tcache hotpath allocations.
Copyright (C) 2013-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef TEST_FUNC
# define TEST_FUNC(size) malloc(size)
# define TEST_NAME "malloc"
#endif
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "bench-util.h"
#include "bench-util.c"
#include "bench-timing.h"
#include "json-lib.h"
/* Benchmark duration in seconds. */
#define BENCHMARK_DURATION 3
static volatile bool timeout;
size_t alloc_size;
static void
alarm_handler (int signum)
{
timeout = true;
}
struct bench_result {
size_t iters;
timing_t elapsed;
};
static __always_inline size_t
malloc_benchmark_loop (void **elems, size_t nr_items)
{
size_t iters = nr_items;
while (!timeout)
{
elems[iters % nr_items] = TEST_FUNC (alloc_size);
iters++;
free (elems[iters % nr_items]);
}
return iters - nr_items;
}
static void
do_benchmark (struct bench_result *res)
{
timing_t start, stop;
void *elems[10];
memset (elems, 0, sizeof(elems));
alarm (BENCHMARK_DURATION);
/* Ramp up cpu before measuring. */
bench_start ();
TIMING_NOW (start);
res[0].iters = malloc_benchmark_loop (elems, 1);
TIMING_NOW (stop);
TIMING_DIFF (res[0].elapsed, start, stop);
timeout = false;
alarm (BENCHMARK_DURATION);
bench_start ();
TIMING_NOW (start);
res[1].iters = malloc_benchmark_loop (elems, 4);
TIMING_NOW (stop);
TIMING_DIFF (res[1].elapsed, start, stop);
}
static void usage (const char *name)
{
fprintf (stderr, "%s: <alloc_size>\n", name);
exit (1);
}
int
main (int argc, char **argv)
{
json_ctx_t json_ctx;
double d_total_s, d_total_i;
struct sigaction act;
if (argc == 1)
alloc_size = 1024;
else if (argc == 2)
{
long ret;
errno = 0;
ret = strtol (argv[1], NULL, 10);
if (errno || ret == 0)
usage (argv[0]);
alloc_size = ret;
}
else
usage (argv[0]);
json_init (&json_ctx, 0, stdout);
json_document_begin (&json_ctx);
json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
json_attr_object_begin (&json_ctx, "functions");
json_attr_object_begin (&json_ctx, TEST_NAME);
memset (&act, 0, sizeof (act));
act.sa_handler = &alarm_handler;
sigaction (SIGALRM, &act, NULL);
struct bench_result res[2];
memset (res, 0, sizeof (struct bench_result) * 2);
do_benchmark (res);
d_total_s = res[0].elapsed;
d_total_i = res[0].iters;
json_attr_object_begin (&json_ctx, "simple");
json_attr_double (&json_ctx, "alloc_size", alloc_size);
json_attr_double (&json_ctx, "duration", d_total_s);
json_attr_double (&json_ctx, "iterations", d_total_i);
json_attr_double (&json_ctx, "time_per_iteration", d_total_s / d_total_i);
json_attr_object_end (&json_ctx);
d_total_s = res[1].elapsed;
d_total_i = res[1].iters;
json_attr_object_begin (&json_ctx, "optimized");
json_attr_double (&json_ctx, "alloc_size", alloc_size);
json_attr_double (&json_ctx, "duration", d_total_s);
json_attr_double (&json_ctx, "iterations", d_total_i);
json_attr_double (&json_ctx, "time_per_iteration", d_total_s / d_total_i);
json_attr_object_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_document_end (&json_ctx);
return 0;
}
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