benchtests/bench-memcpy-large.c

   1 /* Measure memcpy functions with large data sizes.
   2    Copyright (C) 2016-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef MEMCPY_RESULT
  20 # define MEMCPY_RESULT(dst, len) dst
  21 # define START_SIZE (64 * 1024)
  22 # define MIN_PAGE_SIZE (getpagesize () + 32 * 1024 * 1024)
  23 # define TEST_MAIN
  24 # define TEST_NAME "memcpy"
  25 # define TIMEOUT (20 * 60)
  26 # include "bench-string.h"
  27
  28 IMPL (memcpy, 1)
  29 #endif
  30
  31 typedef char *(*proto_t) (char *, const char *, size_t);
  32
  33 static void
  34 do_one_test (impl_t *impl, char *dst, const char *src,
  35              size_t len)
  36 {
  37   size_t i, iters = 16;
  38   timing_t start, stop, cur;
  39
  40   /* Must clear the destination buffer updated by the previous run.  */
  41   for (i = 0; i < len; i++)
  42     dst[i] = 0;
  43
  44   if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
  45     {
  46       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  47              CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
  48       ret = 1;
  49       return;
  50     }
  51
  52   if (memcmp (dst, src, len) != 0)
  53     {
  54       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  55              impl->name, dst, src);
  56       ret = 1;
  57       return;
  58     }
  59
  60   TIMING_NOW (start);
  61   for (i = 0; i < iters; ++i)
  62     {
  63       CALL (impl, dst, src, len);
  64     }
  65   TIMING_NOW (stop);
  66
  67   TIMING_DIFF (cur, start, stop);
  68
  69   TIMING_PRINT_MEAN ((double) cur, (double) iters);
  70 }
  71
  72 static void
  73 do_test (size_t align1, size_t align2, size_t len)
  74 {
  75   size_t i, j;
  76   char *s1, *s2;
  77
  78   align1 &= 63;
  79   if (align1 + len >= page_size)
  80     return;
  81
  82   align2 &= 63;
  83   if (align2 + len >= page_size)
  84     return;
  85
  86   s1 = (char *) (buf1 + align1);
  87   s2 = (char *) (buf2 + align2);
  88
  89   for (i = 0, j = 1; i < len; i++, j += 23)
  90     s1[i] = j;
  91
  92   printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
  93
  94   FOR_EACH_IMPL (impl, 0)
  95     do_one_test (impl, s2, s1, len);
  96
  97   putchar ('\n');
  98 }
  99
 100 int
 101 test_main (void)
 102 {
 103   size_t i;
 104
 105   test_init ();
 106
 107   printf ("%23s", "");
 108   FOR_EACH_IMPL (impl, 0)
 109     printf ("\t%s", impl->name);
 110   putchar ('\n');
 111
 112   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 113     {
 114       do_test (0, 0, i + 7);
 115       do_test (0, 3, i + 15);
 116       do_test (3, 0, i + 31);
 117       do_test (3, 5, i + 63);
 118     }
 119
 120   return ret;
 121 }
 122
 123 #include <support/test-driver.c>