benchtests/bench-memset-large.c

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