1  /* Measure memset function throughput with large data sizes.
       2     Copyright (C) 2017-2023 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
      22  #define MIN_PAGE_SIZE (getpagesize () + 32 * 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, CHAR *s_end,
      36  	     int c __attribute ((unused)), size_t n)
      37  {
      38    size_t i, iters = MIN_PAGE_SIZE / n;
      39    timing_t start, stop, cur;
      40  
      41    TIMING_NOW (start);
      42    for (i = 0; i < iters && s <= s_end; s_end -= n, i++)
      43      CALL (impl, s, c, n);
      44    TIMING_NOW (stop);
      45  
      46    TIMING_DIFF (cur, start, stop);
      47  
      48    /* Get time taken per function call.  */
      49    json_element_double (json_ctx, (double) cur / i);
      50  }
      51  
      52  static void
      53  do_test (json_ctx_t *json_ctx, int c, size_t len)
      54  {
      55    json_element_object_begin (json_ctx);
      56    json_attr_uint (json_ctx, "length", len);
      57    json_attr_uint (json_ctx, "char", c);
      58    json_array_begin (json_ctx, "timings");
      59  
      60    FOR_EACH_IMPL (impl, 0)
      61      {
      62        do_one_test (json_ctx, impl, (CHAR *) buf1,
      63  		   (CHAR *) buf1 + MIN_PAGE_SIZE - len, c, len);
      64        alloc_bufs ();
      65      }
      66  
      67    json_array_end (json_ctx);
      68    json_element_object_end (json_ctx);
      69  }
      70  
      71  int
      72  test_main (void)
      73  {
      74    json_ctx_t json_ctx;
      75    size_t i;
      76  
      77    test_init ();
      78  
      79    json_init (&json_ctx, 0, stdout);
      80  
      81    json_document_begin (&json_ctx);
      82    json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
      83  
      84    json_attr_object_begin (&json_ctx, "functions");
      85    json_attr_object_begin (&json_ctx, TEST_NAME);
      86    json_attr_string (&json_ctx, "bench-variant", "walk");
      87  
      88    json_array_begin (&json_ctx, "ifuncs");
      89    FOR_EACH_IMPL (impl, 0)
      90      json_element_string (&json_ctx, impl->name);
      91    json_array_end (&json_ctx);
      92  
      93    json_array_begin (&json_ctx, "results");
      94    for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
      95      {
      96        do_test (&json_ctx, 65, i);
      97        do_test (&json_ctx, 65, i + 1);
      98      }
      99  
     100    for (i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
     101      {
     102        do_test (&json_ctx, 0, i);
     103        do_test (&json_ctx, 0, i + 1);
     104      }
     105  
     106    json_array_end (&json_ctx);
     107    json_attr_object_end (&json_ctx);
     108    json_attr_object_end (&json_ctx);
     109    json_document_end (&json_ctx);
     110  
     111    return ret;
     112  }
     113  
     114  #include <support/test-driver.c>
     115  
     116  #define libc_hidden_builtin_def(X)
     117  #define libc_hidden_def(X)
     118  #define libc_hidden_weak(X)
     119  #define weak_alias(X,Y)
     120  #undef MEMSET
     121  #define MEMSET generic_memset
     122  #include <string/memset.c>