lustre/tests/reads.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*
  27  * This file is part of Lustre, http://www.lustre.org/
  28  * Lustre is a trademark of Sun Microsystems, Inc.
  29  *
  30  * lustre/tests/reads.c
  31  *
  32  * Lustre Reads test
  33  *
  34  * Author: Nikita Danilov <nikita@clusterfs.com>
  35  */
  36
  37 #define _XOPEN_SOURCE 500 /* for pread(2) */
  38
  39 #include <errno.h>
  40 #include <fcntl.h>
  41 #include <ctype.h>
  42 #include <unistd.h>
  43 #include <stdlib.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46
  47 #include <sys/types.h>
  48 #include <sys/time.h>
  49
  50 static void usage(void)
  51 {
  52         printf("reads: read random or stride chunks of a file.\n");
  53         printf("Usage:\n\n");
  54         printf("reads -f <filename> -s <filesize> -b <buffersize> -a <adjacent reads> [-v] [-h] [-C] [-l <stride_length> ] [ -o <stride_offset> ] [-S <seed>] [-n <iterations>][-w <width>] [-t <timelimit>]\n");
  55 }
  56
  57 enum {
  58         BSIZE_DEFAULT = 16 * 4096
  59 };
  60
  61 #define LOG(level, ...)                         \
  62 ({                                              \
  63         if ((level) <= verbosity)               \
  64                 fprintf(stderr, __VA_ARGS__);   \
  65 })
  66
  67 enum {
  68         LOG_CRIT,
  69         LOG_WARN,
  70         LOG_INFO,
  71         LOG_DEBUG
  72 };
  73
  74 enum {
  75         RR_OK,
  76         RR_PARSE,
  77         RR_SET,
  78         RR_MALLOC,
  79         RR_OPEN,
  80         RR_PRECLEAN,
  81         RR_READ
  82 };
  83
  84 int main(int argc, char **argv)
  85 {
  86         int    verbosity = LOG_CRIT;
  87         char  *fname = NULL;
  88         loff_t size = 0;
  89         size_t bsize = 0;
  90         int    ad = 1;
  91         int    preclean = 0;
  92         int    width = 10;
  93         unsigned int seed = 0;
  94         unsigned long iterations = 0;
  95         unsigned long timelimit = 24 * 3600;
  96         unsigned long stride_length = 0;
  97         unsigned long stride_offset = 0;
  98
  99         int opt;
 100         int fd;
 101         unsigned long nblocks;
 102         unsigned long i;
 103         ssize_t  ret;
 104
 105         struct timeval start;
 106         struct timeval stop;
 107
 108         double usecs;
 109
 110         char *buf;
 111         char *term;
 112
 113         do {
 114                 opt = getopt(argc, argv, "f:s:b:va:hCS:n:t:l:o:w:");
 115                 switch (opt) {
 116                 case -1:
 117                         break;
 118                 default:
 119                         LOG(LOG_CRIT, "Unable to parse command line.\n");
 120                 case 'h':
 121                         usage();
 122                         return RR_PARSE;
 123                 case 'v':
 124                         verbosity ++;
 125                         break;
 126                 case 'f':
 127                         fname = strdup(optarg);
 128                         break;
 129                 case 's':
 130                         size = strtol(optarg, &term, 0);
 131                         if (term == optarg) {
 132                                 fprintf (stderr, "Can't parse size %s\n", optarg);
 133                                 usage();
 134                                 return RR_SET;
 135                         }
 136                         break;
 137                 case 'b':
 138                         bsize = strtol(optarg, &term, 0);
 139                         if (term == optarg) {
 140                                 fprintf (stderr, "Can't parse bsize %s\n", optarg);
 141                                 usage();
 142                                 return RR_SET;
 143                         }
 144                         break;
 145                 case 'a':
 146                         ad = (int)strtol(optarg, &term, 0);
 147                         if (term == optarg) {
 148                                 fprintf (stderr, "Can't parse ad %s\n", optarg);
 149                                 usage();
 150                                 return RR_SET;
 151                         }
 152                         break;
 153                 case 'C':
 154                         preclean = 1;
 155                         break;
 156                 case 'S':
 157                         seed = strtol(optarg, &term, 0);
 158                         if (term == optarg) {
 159                                 fprintf (stderr, "Can't parse seed %s\n", optarg);
 160                                 usage();
 161                                 return RR_SET;
 162                         }
 163                         break;
 164                 case 'n':
 165                         iterations = strtol(optarg, &term, 0);
 166                         if (term == optarg) {
 167                                 fprintf (stderr, "Can't parse seed %s\n", optarg);
 168                                 usage();
 169                                 return RR_SET;
 170                         }
 171                         break;
 172
 173                         break;
 174                 case 't':
 175                         timelimit = strtol(optarg, &term, 0);
 176                         if (term == optarg) {
 177                                 fprintf (stderr, "Can't parse seed %s\n", optarg);
 178                                 usage();
 179                                 return RR_SET;
 180                         }
 181                         break;
 182                 case 'l':
 183                         stride_length = strtol(optarg, &term, 0);
 184                         if (term == optarg) {
 185                                 fprintf (stderr, "Can't parse seed %s\n", optarg);
 186                                 usage();
 187                                 return RR_SET;
 188                         }
 189                         break;
 190                 case 'o':
 191                         stride_offset = strtol(optarg, &term, 0);
 192                         if (term == optarg) {
 193                                 fprintf (stderr, "Can't parse seed %s\n", optarg);
 194                                 usage();
 195                                 return RR_SET;
 196                         }
 197                         break;
 198                 case 'w':
 199                         width = (int)strtol(optarg, &term, 0);
 200                         if (term == optarg) {
 201                                 fprintf (stderr, "Can't parse seed %s\n", optarg);
 202                                 usage();
 203                                 return RR_SET;
 204                         }
 205                         break;
 206                 }
 207         } while (opt != -1);
 208
 209         if (fname == NULL || size == 0 || bsize == 0 || ad <= 0) {
 210                 usage();
 211                 return RR_SET;
 212         }
 213
 214         bsize /= ad;
 215         nblocks = size / bsize;
 216         buf = malloc(bsize);
 217         if (buf == NULL) {
 218                 LOG(LOG_CRIT, "malloc(%lu) failure: %s\n", (long)bsize,
 219                     strerror(errno));
 220                 return RR_MALLOC;
 221         }
 222
 223         fd = open(fname, (preclean ? O_RDWR : O_RDONLY) | O_CREAT, 0700);
 224         if (fd == -1) {
 225                 LOG(LOG_CRIT, "malloc(\"%s\") failure: %s\n", fname,
 226                     strerror(errno));
 227                 return RR_OPEN;
 228         }
 229         if (preclean) {
 230                 loff_t towrite;
 231                 size_t count;
 232
 233                 LOG(LOG_INFO, "precleaning");
 234                 for (i = 0, towrite = size; towrite > 0; towrite -= ret) {
 235                         count = bsize < towrite ? bsize : towrite;
 236                         memset(buf, bsize, seed + i++);
 237                         ret = write(fd, buf, count);
 238                         if (ret < 0) {
 239                                 LOG(LOG_CRIT, "write() failure: %s\n",
 240                                     strerror(errno));
 241                                 close(fd);
 242                                 return RR_PRECLEAN;
 243                         }
 244                 }
 245         }
 246         if (seed != 0)
 247                 srand(seed);
 248         gettimeofday(&start, NULL);
 249         timelimit += start.tv_sec;
 250         for (i = 0; !iterations || i < iterations; i ++) {
 251                 unsigned long block_nr;
 252                 int j;
 253
 254                 if (stride_length)
 255                         block_nr = (unsigned long)(i*stride_length +
 256                                                    stride_offset) % nblocks;
 257                 else
 258                         block_nr = (unsigned long)((double)nblocks*rand()/
 259                                                    (RAND_MAX+1.0));
 260                 if (i % width == 0)
 261                         LOG(LOG_INFO, "\n%9lu: ", i);
 262                 LOG(LOG_INFO, "%7lu ", block_nr);
 263                 for (j = 0; j < ad; j++) {
 264                         ret = pread(fd, buf, bsize, (block_nr + j) * bsize);
 265                         if (ret != bsize) {
 266                                 LOG(LOG_CRIT,
 267                                     "pread(...%zi, %li) got: %zi, %s\n", bsize,
 268                                     block_nr * bsize, ret, strerror(errno));
 269                                 close(fd);
 270                                 return RR_READ;
 271                         }
 272                 }
 273                 gettimeofday(&stop, NULL);
 274                 if (stop.tv_sec > timelimit)
 275                         break;
 276         }
 277         close(fd);
 278         usecs = (stop.tv_sec - start.tv_sec) * 1000000. +
 279                 stop.tv_usec - start.tv_usec;
 280         printf("\n%fs, %gMB/s\n", usecs / 1000000.,
 281                (double)bsize * ad * i / usecs);
 282         return RR_OK;
 283 }