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  *
  29  * lustre/tests/reads.c
  30  *
  31  * Lustre Reads test
  32  *
  33  * Author: Nikita Danilov <nikita@clusterfs.com>
  34  */
  35
  36 #define _XOPEN_SOURCE 500 /* for pread(2) */
  37
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <ctype.h>
  41 #include <unistd.h>
  42 #include <stdlib.h>
  43 #include <stdio.h>
  44 #include <string.h>
  45
  46 #include <sys/types.h>
  47 #include <sys/time.h>
  48
  49 static void usage(void)
  50 {
  51         printf("reads: read random or stride chunks of a file.\n");
  52         printf("Usage:\n\n");
  53         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");
  54 }
  55
  56 enum {
  57         BSIZE_DEFAULT = 16 * 4096
  58 };
  59
  60 #define LOG(level, ...)                         \
  61 ({                                              \
  62         if ((level) <= verbosity)               \
  63                 fprintf(stderr, __VA_ARGS__);   \
  64 })
  65
  66 enum {
  67         LOG_CRIT,
  68         LOG_WARN,
  69         LOG_INFO,
  70         LOG_DEBUG
  71 };
  72
  73 enum {
  74         RR_OK,
  75         RR_PARSE,
  76         RR_SET,
  77         RR_MALLOC,
  78         RR_OPEN,
  79         RR_PRECLEAN,
  80         RR_READ
  81 };
  82
  83 int main(int argc, char **argv)
  84 {
  85         int    verbosity = LOG_CRIT;
  86         char  *fname = NULL;
  87         loff_t size = 0;
  88         size_t bsize = 0;
  89         int    ad = 1;
  90         int    preclean = 0;
  91         int    width = 10;
  92         unsigned int seed = 0;
  93         unsigned long iterations = 0;
  94         unsigned long timelimit = 24 * 3600;
  95         unsigned long stride_length = 0;
  96         unsigned long stride_offset = 0;
  97
  98         int opt;
  99         int fd;
 100         unsigned long nblocks;
 101         unsigned long i;
 102         ssize_t  ret;
 103
 104         struct timeval start;
 105         struct timeval stop;
 106
 107         double usecs;
 108
 109         char *buf;
 110         char *term;
 111
 112         do {
 113                 opt = getopt(argc, argv, "f:s:b:va:hCS:n:t:l:o:w:");
 114                 switch (opt) {
 115                 case -1:
 116                         break;
 117                 default:
 118                         LOG(LOG_CRIT, "Unable to parse command line.\n");
 119                 case 'h':
 120                         usage();
 121                         return RR_PARSE;
 122                 case 'v':
 123                         verbosity++;
 124                         break;
 125                 case 'f':
 126                         fname = strdup(optarg);
 127                         break;
 128                 case 's':
 129                         size = strtol(optarg, &term, 0);
 130                         if (term == optarg) {
 131                                 fprintf(stderr, "Can't parse size %s\n",
 132                                         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",
 141                                         optarg);
 142                                 usage();
 143                                 return RR_SET;
 144                         }
 145                         break;
 146                 case 'a':
 147                         ad = (int)strtol(optarg, &term, 0);
 148                         if (term == optarg) {
 149                                 fprintf(stderr, "Can't parse ad %s\n",
 150                                         optarg);
 151                                 usage();
 152                                 return RR_SET;
 153                         }
 154                         break;
 155                 case 'C':
 156                         preclean = 1;
 157                         break;
 158                 case 'S':
 159                         seed = strtol(optarg, &term, 0);
 160                         if (term == optarg) {
 161                                 fprintf(stderr, "Can't parse seed %s\n",
 162                                         optarg);
 163                                 usage();
 164                                 return RR_SET;
 165                         }
 166                         break;
 167                 case 'n':
 168                         iterations = strtol(optarg, &term, 0);
 169                         if (term == optarg) {
 170                                 fprintf(stderr, "Can't parse seed %s\n",
 171                                         optarg);
 172                                 usage();
 173                                 return RR_SET;
 174                         }
 175                         break;
 176
 177                         break;
 178                 case 't':
 179                         timelimit = strtol(optarg, &term, 0);
 180                         if (term == optarg) {
 181                                 fprintf(stderr, "Can't parse seed %s\n",
 182                                         optarg);
 183                                 usage();
 184                                 return RR_SET;
 185                         }
 186                         break;
 187                 case 'l':
 188                         stride_length = strtol(optarg, &term, 0);
 189                         if (term == optarg) {
 190                                 fprintf(stderr, "Can't parse seed %s\n",
 191                                         optarg);
 192                                 usage();
 193                                 return RR_SET;
 194                         }
 195                         break;
 196                 case 'o':
 197                         stride_offset = strtol(optarg, &term, 0);
 198                         if (term == optarg) {
 199                                 fprintf(stderr, "Can't parse seed %s\n",
 200                                         optarg);
 201                                 usage();
 202                                 return RR_SET;
 203                         }
 204                         break;
 205                 case 'w':
 206                         width = (int)strtol(optarg, &term, 0);
 207                         if (term == optarg) {
 208                                 fprintf(stderr, "Can't parse seed %s\n",
 209                                         optarg);
 210                                 usage();
 211                                 return RR_SET;
 212                         }
 213                         break;
 214                 }
 215         } while (opt != -1);
 216
 217         if (fname == NULL || size == 0 || bsize == 0 || ad <= 0) {
 218                 usage();
 219                 return RR_SET;
 220         }
 221
 222         bsize /= ad;
 223         nblocks = size / bsize;
 224         buf = malloc(bsize);
 225         if (buf == NULL) {
 226                 LOG(LOG_CRIT, "malloc(%lu) failure: %s\n", (long)bsize,
 227                     strerror(errno));
 228                 return RR_MALLOC;
 229         }
 230
 231         fd = open(fname, (preclean ? O_RDWR : O_RDONLY) | O_CREAT, 0700);
 232         if (fd == -1) {
 233                 LOG(LOG_CRIT, "malloc(\"%s\") failure: %s\n", fname,
 234                     strerror(errno));
 235                 return RR_OPEN;
 236         }
 237         if (preclean) {
 238                 loff_t towrite;
 239                 size_t count;
 240
 241                 LOG(LOG_INFO, "precleaning");
 242                 for (i = 0, towrite = size; towrite > 0; towrite -= ret) {
 243                         count = bsize < towrite ? bsize : towrite;
 244                         memset(buf, bsize, seed + i++);
 245                         ret = write(fd, buf, count);
 246                         if (ret < 0) {
 247                                 LOG(LOG_CRIT, "write() failure: %s\n",
 248                                     strerror(errno));
 249                                 close(fd);
 250                                 return RR_PRECLEAN;
 251                         }
 252                 }
 253         }
 254         if (seed != 0)
 255                 srand(seed);
 256         gettimeofday(&start, NULL);
 257         timelimit += start.tv_sec;
 258         for (i = 0; !iterations || i < iterations; i++) {
 259                 unsigned long block_nr;
 260                 int j;
 261
 262                 if (stride_length)
 263                         block_nr = (unsigned long)(i*stride_length +
 264                                                    stride_offset) % nblocks;
 265                 else
 266                         block_nr = (unsigned long)((double)nblocks*rand()/
 267                                                    (RAND_MAX+1.0));
 268                 if (i % width == 0)
 269                         LOG(LOG_INFO, "\n%9lu: ", i);
 270                 LOG(LOG_INFO, "%7lu ", block_nr);
 271                 for (j = 0; j < ad; j++) {
 272                         ret = pread(fd, buf, bsize, (block_nr + j) * bsize);
 273                         if (ret != bsize) {
 274                                 LOG(LOG_CRIT,
 275                                     "pread(...%zi, %li) got: %zi, %s\n", bsize,
 276                                     block_nr * bsize, ret, strerror(errno));
 277                                 close(fd);
 278                                 return RR_READ;
 279                         }
 280                 }
 281                 gettimeofday(&stop, NULL);
 282                 if (stop.tv_sec > timelimit)
 283                         break;
 284         }
 285         close(fd);
 286         usecs = (stop.tv_sec - start.tv_sec) * 1000000. +
 287                 stop.tv_usec - start.tv_usec;
 288         printf("\n%fs, %gMB/s\n", usecs / 1000000.,
 289                (double)bsize * ad * i / usecs);
 290         return RR_OK;
 291 }