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 #include "json-lib.h"
  32
  33 typedef char *(*proto_t) (char *, const char *, size_t);
  34
  35 static void
  36 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, const char *src,
  37              size_t len)
  38 {
  39   size_t i, iters = 16;
  40   timing_t start, stop, cur;
  41
  42   /* Must clear the destination buffer updated by the previous run.  */
  43   for (i = 0; i < len; i++)
  44     dst[i] = 0;
  45
  46   if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
  47     {
  48       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  49              CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
  50       ret = 1;
  51       return;
  52     }
  53
  54   if (memcmp (dst, src, len) != 0)
  55     {
  56       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  57              impl->name, dst, src);
  58       ret = 1;
  59       return;
  60     }
  61
  62   TIMING_NOW (start);
  63   for (i = 0; i < iters; ++i)
  64     {
  65       CALL (impl, dst, src, len);
  66     }
  67   TIMING_NOW (stop);
  68
  69   TIMING_DIFF (cur, start, stop);
  70
  71   json_element_double (json_ctx, (double) cur / (double) iters);
  72 }
  73
  74 static void
  75 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  76 {
  77   size_t i, j;
  78   char *s1, *s2;
  79
  80   align1 &= 63;
  81   if (align1 + len >= page_size)
  82     return;
  83
  84   align2 &= 63;
  85   if (align2 + len >= page_size)
  86     return;
  87
  88   s1 = (char *) (buf1 + align1);
  89   s2 = (char *) (buf2 + align2);
  90
  91   for (i = 0, j = 1; i < len; i++, j += 23)
  92     s1[i] = j;
  93
  94   json_element_object_begin (json_ctx);
  95   json_attr_uint (json_ctx, "length", (double) len);
  96   json_attr_uint (json_ctx, "align1", (double) align1);
  97   json_attr_uint (json_ctx, "align2", (double) align2);
  98   json_array_begin (json_ctx, "timings");
  99
 100   FOR_EACH_IMPL (impl, 0)
 101     do_one_test (json_ctx, impl, s2, s1, len);
 102
 103   json_array_end (json_ctx);
 104   json_element_object_end (json_ctx);
 105 }
 106
 107 int
 108 test_main (void)
 109 {
 110   json_ctx_t json_ctx;
 111   size_t i;
 112
 113   test_init ();
 114
 115   json_init (&json_ctx, 0, stdout);
 116
 117   json_document_begin (&json_ctx);
 118   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 119
 120   json_attr_object_begin (&json_ctx, "functions");
 121   json_attr_object_begin (&json_ctx, "memcpy");
 122   json_attr_string (&json_ctx, "bench-variant", "large");
 123
 124   json_array_begin (&json_ctx, "ifuncs");
 125   FOR_EACH_IMPL (impl, 0)
 126     json_element_string (&json_ctx, impl->name);
 127   json_array_end (&json_ctx);
 128
 129   json_array_begin (&json_ctx, "results");
 130   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 131     {
 132       do_test (&json_ctx, 0, 0, i + 7);
 133       do_test (&json_ctx, 0, 3, i + 15);
 134       do_test (&json_ctx, 3, 0, i + 31);
 135       do_test (&json_ctx, 3, 5, i + 63);
 136     }
 137
 138   json_array_end (&json_ctx);
 139   json_attr_object_end (&json_ctx);
 140   json_attr_object_end (&json_ctx);
 141   json_document_end (&json_ctx);
 142
 143   return ret;
 144 }
 145
 146 #include <support/test-driver.c>