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Keeping the same buffers along with copying the same size of data into the same location means that the first routine is typically the slowest since it has to bear the cost of fetching data into to cache. Reallocating buffers stabilizes numbers by a bit. * benchtests/bench-string.h (realloc_bufs): New function. (test_init): Call it. * benchtests/bench-memset-large.c (do_test): Likewise. * benchtests/bench-memset.c (do_test): Likewise.
143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/* Measure memset functions with large data sizes.
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#define TEST_MAIN
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#ifndef WIDE
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# define TEST_NAME "memset"
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#else
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# define TEST_NAME "wmemset"
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#endif /* WIDE */
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#define START_SIZE (128 * 1024)
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#define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024)
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#define TIMEOUT (20 * 60)
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#include "bench-string.h"
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#ifndef WIDE
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# define MEMSET memset
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# define CHAR char
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# define SIMPLE_MEMSET simple_memset
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# define MEMCMP memcmp
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#else
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# include <wchar.h>
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# define MEMSET wmemset
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# define CHAR wchar_t
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# define SIMPLE_MEMSET simple_wmemset
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# define MEMCMP wmemcmp
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#endif /* WIDE */
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#include <assert.h>
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#include "json-lib.h"
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IMPL (MEMSET, 1)
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typedef CHAR *(*proto_t) (CHAR *, int, size_t);
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CHAR *
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inhibit_loop_to_libcall
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SIMPLE_MEMSET (CHAR *s, int c, size_t n)
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{
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CHAR *r = s, *end = s + n;
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while (r < end)
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*r++ = c;
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return s;
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}
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static void
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do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
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int c __attribute ((unused)), size_t n)
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{
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size_t i, iters = 16;
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timing_t start, stop, cur;
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TIMING_NOW (start);
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for (i = 0; i < iters; ++i)
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{
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CALL (impl, s, c, n);
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}
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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json_element_double (json_ctx, (double) cur / (double) iters);
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}
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static void
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do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
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{
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align &= 63;
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if ((align + len) * sizeof (CHAR) > page_size)
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return;
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json_element_object_begin (json_ctx);
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json_attr_uint (json_ctx, "length", len);
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json_attr_uint (json_ctx, "alignment", align);
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json_attr_int (json_ctx, "char", c);
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json_array_begin (json_ctx, "timings");
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FOR_EACH_IMPL (impl, 0)
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{
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do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
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realloc_bufs ();
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}
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json_array_end (json_ctx);
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json_element_object_end (json_ctx);
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}
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int
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test_main (void)
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{
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json_ctx_t json_ctx;
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size_t i;
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int c;
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test_init ();
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json_init (&json_ctx, 0, stdout);
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json_document_begin (&json_ctx);
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json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
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json_attr_object_begin (&json_ctx, "functions");
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json_attr_object_begin (&json_ctx, TEST_NAME);
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json_attr_string (&json_ctx, "bench-variant", "large");
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json_array_begin (&json_ctx, "ifuncs");
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FOR_EACH_IMPL (impl, 0)
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json_element_string (&json_ctx, impl->name);
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json_array_end (&json_ctx);
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json_array_begin (&json_ctx, "results");
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c = 65;
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for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
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{
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do_test (&json_ctx, 0, c, i);
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do_test (&json_ctx, 3, c, i);
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}
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json_array_end (&json_ctx);
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json_attr_object_end (&json_ctx);
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json_attr_object_end (&json_ctx);
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json_document_end (&json_ctx);
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return ret;
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}
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#include <support/test-driver.c>
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