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/* Benchmark malloc and free functions.
Copyright (C) 2019-2021 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/>. */
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <sys/resource.h>
#include "bench-timing.h"
#include "json-lib.h"
/* Benchmark the malloc/free performance of a varying number of blocks of a
given size. This enables performance tracking of the t-cache and fastbins.
It tests 3 different scenarios: single-threaded using main arena,
multi-threaded using thread-arena, and main arena with SINGLE_THREAD_P
false. */
#define NUM_ITERS 200000
#define NUM_ALLOCS 4
#define MAX_ALLOCS 1600
typedef struct
{
size_t iters;
size_t size;
int n;
timing_t elapsed;
} malloc_args;
static void
do_benchmark (malloc_args *args, int **arr)
{
timing_t start, stop;
size_t iters = args->iters;
size_t size = args->size;
int n = args->n;
TIMING_NOW (start);
for (int j = 0; j < iters; j++)
{
for (int i = 0; i < n; i++)
arr[i] = malloc (size);
for (int i = 0; i < n; i++)
free (arr[i]);
}
TIMING_NOW (stop);
TIMING_DIFF (args->elapsed, start, stop);
}
static malloc_args tests[3][NUM_ALLOCS];
static int allocs[NUM_ALLOCS] = { 25, 100, 400, MAX_ALLOCS };
static void *
thread_test (void *p)
{
int **arr = (int**)p;
/* Run benchmark multi-threaded. */
for (int i = 0; i < NUM_ALLOCS; i++)
do_benchmark (&tests[2][i], arr);
return p;
}
void
bench (unsigned long size)
{
size_t iters = NUM_ITERS;
int **arr = (int**) malloc (MAX_ALLOCS * sizeof (void*));
for (int t = 0; t < 3; t++)
for (int i = 0; i < NUM_ALLOCS; i++)
{
tests[t][i].n = allocs[i];
tests[t][i].size = size;
tests[t][i].iters = iters / allocs[i];
/* Do a quick warmup run. */
if (t == 0)
do_benchmark (&tests[0][i], arr);
}
/* Run benchmark single threaded in main_arena. */
for (int i = 0; i < NUM_ALLOCS; i++)
do_benchmark (&tests[0][i], arr);
/* Run benchmark in a thread_arena. */
pthread_t t;
pthread_create (&t, NULL, thread_test, (void*)arr);
pthread_join (t, NULL);
/* Repeat benchmark in main_arena with SINGLE_THREAD_P == false. */
for (int i = 0; i < NUM_ALLOCS; i++)
do_benchmark (&tests[1][i], arr);
free (arr);
json_ctx_t json_ctx;
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, "malloc");
char s[100];
double iters2 = iters;
json_attr_object_begin (&json_ctx, "");
json_attr_double (&json_ctx, "malloc_block_size", size);
struct rusage usage;
getrusage (RUSAGE_SELF, &usage);
json_attr_double (&json_ctx, "max_rss", usage.ru_maxrss);
for (int i = 0; i < NUM_ALLOCS; i++)
{
sprintf (s, "main_arena_st_allocs_%04d_time", allocs[i]);
json_attr_double (&json_ctx, s, tests[0][i].elapsed / iters2);
}
for (int i = 0; i < NUM_ALLOCS; i++)
{
sprintf (s, "main_arena_mt_allocs_%04d_time", allocs[i]);
json_attr_double (&json_ctx, s, tests[1][i].elapsed / iters2);
}
for (int i = 0; i < NUM_ALLOCS; i++)
{
sprintf (s, "thread_arena__allocs_%04d_time", allocs[i]);
json_attr_double (&json_ctx, s, tests[2][i].elapsed / iters2);
}
json_attr_object_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_document_end (&json_ctx);
}
static void usage (const char *name)
{
fprintf (stderr, "%s: <alloc_size>\n", name);
exit (1);
}
int
main (int argc, char **argv)
{
long val = 16;
if (argc == 2)
val = strtol (argv[1], NULL, 0);
if (argc > 2 || val <= 0)
usage (argv[0]);
bench (val);
return 0;
}
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