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/* Measure memset function throughput with large data sizes.
Copyright (C) 2017-2024 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/>. */
#define TEST_MAIN
#ifdef DO_MEMSET
# define TEST_NAME "memset"
#else
# define TEST_NAME "bzero"
#endif
#define START_SIZE 128
#define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
#define TIMEOUT (20 * 60)
#include "bench-string.h"
#include "json-lib.h"
#ifdef DO_MEMSET
void *generic_memset (void *, int, size_t);
typedef void *(*proto_t) (void *, int, size_t);
IMPL (memset, 1)
IMPL (generic_memset, 0)
#else
static void
memset_zero (void * s, size_t len)
{
memset (s, '\0', len);
}
typedef void (*proto_t) (void *, size_t);
IMPL (bzero, 1)
IMPL (memset_zero, 0)
#endif
static void
do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, CHAR *s_end,
size_t n)
{
size_t i, iters = MIN_PAGE_SIZE / n;
timing_t start, stop, cur;
TIMING_NOW (start);
for (i = 0; i < iters && s <= s_end; s_end -= n, i++)
#ifdef DO_MEMSET
CALL (impl, s, 0, n);
#else
CALL (impl, s, n);
#endif
TIMING_NOW (stop);
TIMING_DIFF (cur, start, stop);
/* Get time taken per function call. */
json_element_double (json_ctx, (double) cur / i);
}
static void
do_test (json_ctx_t *json_ctx, size_t len)
{
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", len);
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
{
do_one_test (json_ctx, impl, (CHAR *) buf1,
(CHAR *) buf1 + MIN_PAGE_SIZE - len, len);
alloc_bufs ();
}
json_array_end (json_ctx);
json_element_object_end (json_ctx);
}
int
test_main (void)
{
json_ctx_t json_ctx;
size_t i;
test_init ();
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);
json_attr_string (&json_ctx, "bench-variant", "walk");
json_array_begin (&json_ctx, "ifuncs");
FOR_EACH_IMPL (impl, 0)
json_element_string (&json_ctx, impl->name);
json_array_end (&json_ctx);
json_array_begin (&json_ctx, "results");
for (i = 1; i <= 64; i++)
do_test (&json_ctx, i);
for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
{
do_test (&json_ctx, i);
do_test (&json_ctx, i + 1);
}
json_array_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_attr_object_end (&json_ctx);
json_document_end (&json_ctx);
return ret;
}
#include <support/test-driver.c>
#ifdef DO_MEMSET
# define libc_hidden_builtin_def(X)
# define libc_hidden_def(X)
# define libc_hidden_weak(X)
# define weak_alias(X,Y)
# undef MEMSET
# define MEMSET generic_memset
# include <string/memset.c>
#endif
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