benchtests/bench-bzero-large.c

   1 /* Measure bzero functions with large data sizes.
   2    Copyright (C) 2022-2024 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 TEST_MAIN
  20 #ifdef DO_MEMSET
  21 # define TEST_NAME "memset"
  22 #else
  23 # define TEST_NAME "bzero"
  24 #endif
  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 #include "json-lib.h"
  31
  32 #ifdef DO_MEMSET
  33 void *generic_memset (void *, int, size_t);
  34
  35 typedef void *(*proto_t) (void *, int, size_t);
  36
  37 IMPL (memset, 1)
  38 IMPL (generic_memset, 0)
  39 #else
  40 static void
  41 memset_zero (void * s, size_t len)
  42 {
  43   memset (s, '\0', len);
  44 }
  45
  46 typedef void (*proto_t) (void *, size_t);
  47
  48 IMPL (bzero, 1)
  49 IMPL (memset_zero, 0)
  50 #endif
  51
  52 static void
  53 do_one_test (json_ctx_t *json_ctx, impl_t *impl, CHAR *s, size_t n)
  54 {
  55   size_t i, iters = 16;
  56   timing_t start, stop, cur;
  57
  58   TIMING_NOW (start);
  59   for (i = 0; i < iters; ++i)
  60     {
  61 #ifdef DO_MEMSET
  62       CALL (impl, s, 0, n);
  63 #else
  64       CALL (impl, s, n);
  65 #endif
  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 align, size_t len)
  76 {
  77   align &= 63;
  78   if ((align + len) * sizeof (CHAR) > page_size)
  79     return;
  80
  81   json_element_object_begin (json_ctx);
  82   json_attr_uint (json_ctx, "length", len);
  83   json_attr_uint (json_ctx, "alignment", align);
  84   json_array_begin (json_ctx, "timings");
  85
  86   FOR_EACH_IMPL (impl, 0)
  87     {
  88       do_one_test (json_ctx, impl, (CHAR *) (buf1) + align, len);
  89       alloc_bufs ();
  90     }
  91
  92   json_array_end (json_ctx);
  93   json_element_object_end (json_ctx);
  94 }
  95
  96 int
  97 test_main (void)
  98 {
  99   json_ctx_t json_ctx;
 100   size_t i;
 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   for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
 121     {
 122       do_test (&json_ctx, 0, i);
 123       do_test (&json_ctx, 3, i);
 124     }
 125
 126   json_array_end (&json_ctx);
 127   json_attr_object_end (&json_ctx);
 128   json_attr_object_end (&json_ctx);
 129   json_document_end (&json_ctx);
 130
 131   return ret;
 132 }
 133
 134 #include <support/test-driver.c>
 135
 136 #ifdef DO_MEMSET
 137 # define libc_hidden_builtin_def(X)
 138 # define libc_hidden_def(X)
 139 # define libc_hidden_weak(X)
 140 # define weak_alias(X,Y)
 141 # undef MEMSET
 142 # define MEMSET generic_memset
 143 # include <string/memset.c>
 144 #endif