benchtests/bench-fclose.c

   1 /* Benchmark fclose.
   2    Copyright (C) 2024-2025 Free Software Foundation, Inc.
   3    Copyright The GNU Toolchain Authors.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include "bench-timing.h"
  24 #include "json-lib.h"
  25
  26 #define NUM_FILES       1000000
  27 #define NUM_FCLOSE      100
  28
  29 int
  30 main (int argc, char **argv)
  31 {
  32   json_ctx_t json_ctx;
  33   json_init (&json_ctx, 0, stdout);
  34   json_document_begin (&json_ctx);
  35
  36   json_attr_string (&json_ctx, "timing_type", TIMING_TYPE);
  37   json_attr_object_begin (&json_ctx, "functions");
  38   json_attr_object_begin (&json_ctx, "fclose");
  39
  40   FILE *ff, *keep[NUM_FCLOSE];
  41   int i;
  42
  43   for (i = 0; i < NUM_FILES; i++)
  44     {
  45       ff = fdopen (STDIN_FILENO, "r");
  46       if (!ff)
  47         {
  48           fprintf (stderr, "### failed to fdopen: %m\n");
  49           return EXIT_FAILURE;
  50         }
  51       if (i < NUM_FCLOSE)
  52         keep[i] = ff;
  53     }
  54
  55   timing_t start, stop, elapsed;
  56
  57   TIMING_NOW (start);
  58
  59   for (i = 0; i < NUM_FCLOSE; i++)
  60     fclose (keep[i]);
  61
  62   TIMING_NOW (stop);
  63
  64   TIMING_DIFF (elapsed, start, stop);
  65
  66   json_attr_uint (&json_ctx, "number of FILEs", NUM_FILES);
  67   json_attr_uint (&json_ctx, "number of fclose calls", NUM_FCLOSE);
  68   json_attr_uint (&json_ctx, "duration", elapsed);
  69
  70   json_attr_object_end (&json_ctx);
  71   json_attr_object_end (&json_ctx);
  72   json_document_end (&json_ctx);
  73
  74   return 0;
  75 }