1  /* Measure bzero functions with large data sizes.
       2     Copyright (C) 2022-2023 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