glibc/benchtests/bench-memset.c
Wilco Dijkstra 2623479105 Benchtests: Adjust timing
Adjust iteration counts so benchmarks don't run too slowly or quickly.
Ensure benchmarks take less than 10 seconds on older, slower cores and
more than 0.5 seconds on fast cores.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2023-04-17 13:00:38 +01:00

159 lines
3.9 KiB
C

/* Measure memset functions.
Copyright (C) 2013-2023 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
#ifndef WIDE
# define TEST_NAME "memset"
#else
# define TEST_NAME "wmemset"
# define generic_memset generic_wmemset
#endif /* WIDE */
#define MIN_PAGE_SIZE 131072
#include "bench-string.h"
#include "json-lib.h"
#ifdef WIDE
CHAR *generic_wmemset (CHAR *, CHAR, size_t);
#else
void *generic_memset (void *, int, size_t);
#endif
typedef void *(*proto_t) (void *, int, size_t);
IMPL (MEMSET, 1)
IMPL (generic_memset, 0)
static void
do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
int c __attribute ((unused)), size_t n)
{
size_t i, iters = INNER_LOOP_ITERS;
timing_t start, stop, cur;
TIMING_NOW (start);
for (i = 0; i < iters; ++i)
{
CALL (impl, s, c, n);
}
TIMING_NOW (stop);
TIMING_DIFF (cur, start, stop);
json_element_double (json_ctx, (double) cur / (double) iters);
}
static void
do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
{
align &= 4095;
if ((align + len) * sizeof (CHAR) > page_size)
return;
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", len);
json_attr_uint (json_ctx, "alignment", align);
json_attr_int (json_ctx, "char", c);
json_array_begin (json_ctx, "timings");
FOR_EACH_IMPL (impl, 0)
{
do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
}
json_array_end (json_ctx);
json_element_object_end (json_ctx);
}
int
test_main (void)
{
json_ctx_t json_ctx;
size_t i;
int c = 0;
test_init ();
alloc_bufs ();
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", "default");
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 (c = -65; c <= 130; c += 65)
{
for (i = 0; i < 18; ++i)
do_test (&json_ctx, 0, c, 1 << i);
for (i = 0; i < 64; ++i)
{
do_test (&json_ctx, i, c, i);
do_test (&json_ctx, 4096 - i, c, i);
do_test (&json_ctx, 4095, c, i);
if (i & (i - 1))
do_test (&json_ctx, 0, c, i);
}
for (i = 32; i < 1024; i+=32)
{
do_test (&json_ctx, 0, c, i);
do_test (&json_ctx, i, c, i);
}
do_test (&json_ctx, 1, c, 14);
do_test (&json_ctx, 3, c, 1024);
do_test (&json_ctx, 4, c, 64);
do_test (&json_ctx, 2, c, 25);
}
for (i = 33; i <= 256; i += 4)
{
do_test (&json_ctx, 0, c, 32 * i);
do_test (&json_ctx, i, c, 32 * i);
}
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>
#define libc_hidden_builtin_def(X)
#define libc_hidden_def(X)
#define libc_hidden_weak(X)
#define weak_alias(X,Y)
#ifndef WIDE
# undef MEMSET
# define MEMSET generic_memset
# include <string/memset.c>
#else
# define WMEMSET generic_wmemset
# include <wcsmbs/wmemset.c>
#endif