uspace/app/hbench/fs/dirread.c

   1 /*
   2  * Copyright (c) 2011 Martin Sucha
   3  * Copyright (c) 2019 Vojtech Horky
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  * - Redistributions in binary form must reproduce the above copyright
  13  *   notice, this list of conditions and the following disclaimer in the
  14  *   documentation and/or other materials provided with the distribution.
  15  * - The name of the author may not be used to endorse or promote products
  16  *   derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 /** @addtogroup hbench
  31  * @{
  32  */
  33
  34 #include <dirent.h>
  35 #include <str_error.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include "../hbench.h"
  39
  40 /*
  41  * Note that while this benchmark tries to measure speed of direct
  42  * read, it rather measures speed of FS cache as it is highly probable
  43  * that the corresponding blocks would be cached after first run.
  44  */
  45 static bool runner(stopwatch_t *stopwatch, uint64_t size,
  46     char *error, size_t error_size)
  47 {
  48         const char *path = bench_param_get("dirname", "/");
  49
  50         stopwatch_start(stopwatch);
  51         for (uint64_t i = 0; i < size; i++) {
  52                 DIR *dir = opendir(path);
  53                 if (dir == NULL) {
  54                         snprintf(error, error_size, "failed to open %s for reading: %s",
  55                             path, str_error(errno));
  56                         return false;
  57                 }
  58
  59                 struct dirent *dp;
  60                 while ((dp = readdir(dir))) {
  61                         /* Do nothing */
  62                 }
  63
  64                 closedir(dir);
  65         }
  66         stopwatch_stop(stopwatch);
  67
  68         return true;
  69 }
  70
  71 benchmark_t benchmark_dir_read = {
  72         .name = "dir_read",
  73         .desc = "Read contents of a directory (use 'dirname' param to alter the default).",
  74         .entry = &runner,
  75         .setup = NULL,
  76         .teardown = NULL
  77 };
  78
  79 /**
  80  * @}
  81  */