benchtests/bench-memmove-large.c

   1 /* Measure memmove functions with large data sizes.
   2    Copyright (C) 2016-2024 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 #define BASE_PAGE_SIZE (1024 * 1024)
  20 #define START_SIZE (4 * 1024)
  21 #define MIN_PAGE_SIZE (getpagesize () + 16 * 1024 * 1024)
  22 #define TEST_MAIN
  23 #define TEST_NAME "memmove"
  24 #define TIMEOUT (20 * 60)
  25 #include "bench-string.h"
  26 #include "json-lib.h"
  27
  28 IMPL (memmove, 1)
  29
  30 typedef char *(*proto_t) (char *, const char *, size_t);
  31
  32 static void
  33 do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
  34              size_t len)
  35 {
  36   size_t i, iters = 16;
  37   timing_t start, stop, cur;
  38
  39   TIMING_NOW (start);
  40   for (i = 0; i < iters; ++i)
  41     {
  42       CALL (impl, dst, src, len);
  43     }
  44   TIMING_NOW (stop);
  45
  46   TIMING_DIFF (cur, start, stop);
  47
  48   json_element_double (json_ctx, (double) cur / (double) iters);
  49 }
  50
  51 static void
  52 do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len)
  53 {
  54   size_t i, j;
  55   char *s1, *s2;
  56
  57   align1 &= 127;
  58   if (align1 + len >= page_size)
  59     return;
  60
  61   align2 &= 127;
  62   if (align2 + len >= page_size)
  63     return;
  64
  65   s1 = (char *) (buf2 + align1);
  66   s2 = (char *) (buf2 + align2);
  67
  68   for (i = 0, j = 1; i < len; i++, j += 23)
  69     s1[i] = j;
  70
  71   json_element_object_begin (json_ctx);
  72   json_attr_uint (json_ctx, "length", (double) len);
  73   json_attr_uint (json_ctx, "align1", (double) align1);
  74   json_attr_uint (json_ctx, "align2", (double) align2);
  75   json_array_begin (json_ctx, "timings");
  76
  77   FOR_EACH_IMPL (impl, 0)
  78     do_one_test (json_ctx, impl, s2, s1, len);
  79
  80   json_array_end (json_ctx);
  81   json_element_object_end (json_ctx);
  82 }
  83
  84 int
  85 test_main (void)
  86 {
  87   json_ctx_t json_ctx;
  88   size_t i;
  89
  90   test_init ();
  91
  92   json_init (&json_ctx, 0, stdout);
  93
  94   json_document_begin (&json_ctx);
  95   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
  96
  97   json_attr_object_begin (&json_ctx, "functions");
  98   json_attr_object_begin (&json_ctx, "memmove");
  99   json_attr_string (&json_ctx, "bench-variant", "large");
 100
 101   json_array_begin (&json_ctx, "ifuncs");
 102
 103   FOR_EACH_IMPL (impl, 0)
 104     json_element_string (&json_ctx, impl->name);
 105   json_array_end (&json_ctx);
 106
 107   json_array_begin (&json_ctx, "results");
 108   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 109     {
 110       do_test (&json_ctx, 0, 64, i + 7);
 111       do_test (&json_ctx, 0, 3, i + 15);
 112       do_test (&json_ctx, 3, 0, i + 31);
 113       do_test (&json_ctx, 3, 7, i + 63);
 114       do_test (&json_ctx, 9, 5, i + 127);
 115     }
 116
 117   json_array_end (&json_ctx);
 118   json_attr_object_end (&json_ctx);
 119   json_attr_object_end (&json_ctx);
 120   json_document_end (&json_ctx);
 121
 122   return ret;
 123 }
 124
 125 #include <support/test-driver.c>