1  /* Measure memset functions with large data sizes.
       2     Copyright (C) 2016-2023 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  #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>