benchtests/bench-memcpy-large.c

   1 /* Measure memcpy functions with large data sizes.
   2    Copyright (C) 2016-2022 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    <https://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   TIMING_NOW (start);
  43   for (i = 0; i < iters; ++i)
  44     {
  45       CALL (impl, dst, src, len);
  46     }
  47   TIMING_NOW (stop);
  48
  49   TIMING_DIFF (cur, start, stop);
  50
  51   json_element_double (json_ctx, (double) cur / (double) iters);
  52 }
  53
  54 static void
  55 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
  56          int both_ways)
  57 {
  58   size_t i, j;
  59   char *s1, *s2;
  60   size_t repeats;
  61   align1 &= 4095;
  62   if (align1 + len >= page_size)
  63     return;
  64
  65   align2 &= 4095;
  66   if (align2 + len >= page_size)
  67     return;
  68
  69   s1 = (char *) (buf1 + align1);
  70   s2 = (char *) (buf2 + align2);
  71
  72   for (repeats = both_ways ? 2 : 1; repeats; --repeats)
  73     {
  74       for (i = 0, j = 1; i < len; i++, j += 23)
  75         s1[i] = j;
  76
  77       json_element_object_begin (json_ctx);
  78       json_attr_uint (json_ctx, "length", (double) len);
  79       json_attr_uint (json_ctx, "align1", (double) align1);
  80       json_attr_uint (json_ctx, "align2", (double) align2);
  81       json_attr_uint (json_ctx, "dst > src", (double) (s2 > s1));
  82       json_array_begin (json_ctx, "timings");
  83
  84       FOR_EACH_IMPL (impl, 0)
  85         do_one_test (json_ctx, impl, s2, s1, len);
  86
  87       json_array_end (json_ctx);
  88       json_element_object_end (json_ctx);
  89
  90       s1 = (char *) (buf2 + align1);
  91       s2 = (char *) (buf1 + align2);
  92     }
  93 }
  94
  95 int
  96 test_main (void)
  97 {
  98   json_ctx_t json_ctx;
  99   size_t i;
 100
 101   test_init ();
 102
 103   json_init (&json_ctx, 0, stdout);
 104
 105   json_document_begin (&json_ctx);
 106   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 107
 108   json_attr_object_begin (&json_ctx, "functions");
 109   json_attr_object_begin (&json_ctx, TEST_NAME);
 110   json_attr_string (&json_ctx, "bench-variant", "large");
 111
 112   json_array_begin (&json_ctx, "ifuncs");
 113   FOR_EACH_IMPL (impl, 0)
 114     json_element_string (&json_ctx, impl->name);
 115   json_array_end (&json_ctx);
 116
 117   json_array_begin (&json_ctx, "results");
 118   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 119     {
 120       do_test (&json_ctx, 0, 0, i + 7, 1);
 121       do_test (&json_ctx, 0, 3, i + 15, 1);
 122       do_test (&json_ctx, 3, 0, i + 31, 1);
 123       do_test (&json_ctx, 3, 5, i + 63, 1);
 124       do_test (&json_ctx, 0, 127, i, 1);
 125       do_test (&json_ctx, 0, 255, i, 1);
 126       do_test (&json_ctx, 0, 256, i, 1);
 127       do_test (&json_ctx, 0, 4064, i, 1);
 128     }
 129
 130   json_array_end (&json_ctx);
 131   json_attr_object_end (&json_ctx);
 132   json_attr_object_end (&json_ctx);
 133   json_document_end (&json_ctx);
 134
 135   return ret;
 136 }
 137
 138 #include <support/test-driver.c>