benchtests/bench-memset-large.c

   1 /* Measure memset functions with large data sizes.
   2    Copyright (C) 2016-2019 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 SIMPLE_MEMSET simple_memset
  32 #else
  33 # define SIMPLE_MEMSET simple_wmemset
  34 #endif /* WIDE */
  35
  36 #include <assert.h>
  37 #include "json-lib.h"
  38
  39 IMPL (MEMSET, 1)
  40
  41 typedef CHAR *(*proto_t) (CHAR *, int, size_t);
  42
  43 CHAR *
  44 inhibit_loop_to_libcall
  45 SIMPLE_MEMSET (CHAR *s, int c, size_t n)
  46 {
  47   CHAR *r = s, *end = s + n;
  48   while (r < end)
  49     *r++ = c;
  50   return s;
  51 }
  52
  53 static void
  54 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s,
  55              int c __attribute ((unused)), size_t n)
  56 {
  57   size_t i, iters = 16;
  58   timing_t start, stop, cur;
  59
  60   TIMING_NOW (start);
  61   for (i = 0; i < iters; ++i)
  62     {
  63       CALL (impl, s, c, n);
  64     }
  65   TIMING_NOW (stop);
  66
  67   TIMING_DIFF (cur, start, stop);
  68
  69   json_element_double (json_ctx, (double) cur / (double) iters);
  70 }
  71
  72 static void
  73 do_test (json_ctx_t *json_ctx, size_t align, int c, size_t len)
  74 {
  75   align &= 63;
  76   if ((align + len) * sizeof (CHAR) > page_size)
  77     return;
  78
  79   json_element_object_begin (json_ctx);
  80   json_attr_uint (json_ctx, "length", len);
  81   json_attr_uint (json_ctx, "alignment", align);
  82   json_attr_int (json_ctx, "char", c);
  83   json_array_begin (json_ctx, "timings");
  84
  85   FOR_EACH_IMPL (impl, 0)
  86     {
  87       do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, c, len);
  88       alloc_bufs ();
  89     }
  90
  91   json_array_end (json_ctx);
  92   json_element_object_end (json_ctx);
  93 }
  94
  95 int
  96 test_main (void)
  97 {
  98   json_ctx_t json_ctx;
  99   size_t i;
 100   int c;
 101
 102   test_init ();
 103
 104   json_init (&json_ctx, 0, stdout);
 105
 106   json_document_begin (&json_ctx);
 107   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
 108
 109   json_attr_object_begin (&json_ctx, "functions");
 110   json_attr_object_begin (&json_ctx, TEST_NAME);
 111   json_attr_string (&json_ctx, "bench-variant", "large");
 112
 113   json_array_begin (&json_ctx, "ifuncs");
 114   FOR_EACH_IMPL (impl, 0)
 115     json_element_string (&json_ctx, impl->name);
 116   json_array_end (&json_ctx);
 117
 118   json_array_begin (&json_ctx, "results");
 119
 120   c = 65;
 121   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 122     {
 123       do_test (&json_ctx, 0, c, i);
 124       do_test (&json_ctx, 3, c, i);
 125     }
 126
 127   json_array_end (&json_ctx);
 128   json_attr_object_end (&json_ctx);
 129   json_attr_object_end (&json_ctx);
 130   json_document_end (&json_ctx);
 131
 132   return ret;
 133 }
 134
 135 #include <support/test-driver.c>