mirror of git://sourceware.org/git/glibc.git
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/* Measure memcpy functions with large data sizes.
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Copyright (C) 2016 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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#ifndef MEMCPY_RESULT
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# define MEMCPY_RESULT(dst, len) dst
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# define START_SIZE (64 * 1024)
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# define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
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# define TEST_MAIN
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# define TEST_NAME "memcpy"
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# define TIMEOUT (20 * 60)
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# include "bench-string.h"
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IMPL (memcpy, 1)
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#endif
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typedef char *(*proto_t) (char *, const char *, size_t);
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static void
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do_one_test (impl_t *impl, char *dst, const char *src,
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size_t len)
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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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/* Must clear the destination buffer updated by the previous run. */
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for (i = 0; i < len; i++)
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dst[i] = 0;
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if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
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{
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error (0, 0, "Wrong result in function %s %p %p", impl->name,
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CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
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ret = 1;
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return;
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}
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if (memcmp (dst, src, len) != 0)
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{
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error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
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impl->name, dst, src);
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ret = 1;
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return;
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}
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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, dst, src, len);
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}
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TIMING_NOW (stop);
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TIMING_DIFF (cur, start, stop);
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TIMING_PRINT_MEAN ((double) cur, (double) iters);
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}
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static void
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do_test (size_t align1, size_t align2, size_t len)
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{
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size_t i, j;
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char *s1, *s2;
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align1 &= 63;
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if (align1 + len >= page_size)
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return;
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align2 &= 63;
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if (align2 + len >= page_size)
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return;
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s1 = (char *) (buf1 + align1);
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s2 = (char *) (buf2 + align2);
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for (i = 0, j = 1; i < len; i++, j += 23)
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s1[i] = j;
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printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s2, s1, len);
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putchar ('\n');
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}
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int
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test_main (void)
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{
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size_t i;
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test_init ();
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printf ("%23s", "");
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FOR_EACH_IMPL (impl, 0)
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printf ("\t%s", impl->name);
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putchar ('\n');
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for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
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{
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do_test (0, 0, i + 7);
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do_test (0, 3, i + 15);
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do_test (3, 0, i + 31);
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do_test (3, 5, i + 63);
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}
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return ret;
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}
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#include <support/test-driver.c>
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