benchtests/bench-memset-large.c

   1 /* Measure memset 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 #define TEST_MAIN
  20 #ifndef WIDE
  21 # define TEST_NAME "memset"
  22 #else
  23 # define TEST_NAME "wmemset"
  24 #endif /* WIDE */
  25 #define START_SIZE (128 * 1024)
  26 #define MIN_PAGE_SIZE (getpagesize () + 64 * 1024 * 1024)
  27 #define TIMEOUT (20 * 60)
  28 #include "bench-string.h"
  29
  30 #ifndef WIDE
  31 # define MEMSET memset
  32 # define CHAR char
  33 # define SIMPLE_MEMSET simple_memset
  34 # define MEMCMP memcmp
  35 #else
  36 # include <wchar.h>
  37 # define MEMSET wmemset
  38 # define CHAR wchar_t
  39 # define SIMPLE_MEMSET simple_wmemset
  40 # define MEMCMP wmemcmp
  41 #endif /* WIDE */
  42
  43 #include <assert.h>
  44 #include "json-lib.h"
  45
  46 IMPL (MEMSET, 1)
  47
  48 typedef CHAR *(*proto_t) (CHAR *, int, size_t);
  49
  50 CHAR *
  51 inhibit_loop_to_libcall
  52 SIMPLE_MEMSET (CHAR *s, int c, size_t n)
  53 {
  54   CHAR *r = s, *end = s + n;
  55   while (r < end)
  56     *r++ = c;
  57   return s;
  58 }
  59
  60 static void
  61 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
  62              int c __attribute ((unused)), size_t n)
  63 {
  64   size_t i, iters = 16;
  65   timing_t start, stop, cur;
  66
  67   TIMING_NOW (start);
  68   for (i = 0; i < iters; ++i)
  69     {
  70       CALL (impl, s, c, n);
  71     }
  72   TIMING_NOW (stop);
  73
  74   TIMING_DIFF (cur, start, stop);
  75
  76   json_element_double (json_ctx, (double) cur / (double) iters);
  77 }
  78
  79 static void
  80 do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
  81 {
  82   align &= 63;
  83   if ((align + len) * sizeof (CHAR) > page_size)
  84     return;
  85
  86   json_element_object_begin (json_ctx);
  87   json_attr_uint (json_ctx, "length", len);
  88   json_attr_uint (json_ctx, "alignment", align);
  89   json_attr_int (json_ctx, "char", c);
  90   json_array_begin (json_ctx, "timings");
  91
  92   FOR_EACH_IMPL (impl, 0)
  93     {
  94       do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
  95       realloc_bufs ();
  96     }
  97
  98   json_array_end (json_ctx);
  99   json_element_object_end (json_ctx);
 100 }
 101
 102 int
 103 test_main (void)
 104 {
 105   json_ctx_t json_ctx;
 106   size_t i;
 107   int c;
 108
 109   test_init ();
 110
 111   json_init (&json_ctx, 0, stdout);
 112
 113   json_document_begin (&json_ctx);
 114   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 115
 116   json_attr_object_begin (&json_ctx, "functions");
 117   json_attr_object_begin (&json_ctx, TEST_NAME);
 118   json_attr_string (&json_ctx, "bench-variant", "large");
 119
 120   json_array_begin (&json_ctx, "ifuncs");
 121   FOR_EACH_IMPL (impl, 0)
 122     json_element_string (&json_ctx, impl->name);
 123   json_array_end (&json_ctx);
 124
 125   json_array_begin (&json_ctx, "results");
 126
 127   c = 65;
 128   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 129     {
 130       do_test (&json_ctx, 0, c, i);
 131       do_test (&json_ctx, 3, c, i);
 132     }
 133
 134   json_array_end (&json_ctx);
 135   json_attr_object_end (&json_ctx);
 136   json_attr_object_end (&json_ctx);
 137   json_document_end (&json_ctx);
 138
 139   return ret;
 140 }
 141
 142 #include <support/test-driver.c>