init.c

   1 /*
   2  * This file contains job initialization and setup functions.
   3  */
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include <fcntl.h>
   8 #include <ctype.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include <getopt.h>
  12 #include <sys/ipc.h>
  13 #include <sys/shm.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16
  17 #include "fio.h"
  18 #include "parse.h"
  19 #include "smalloc.h"
  20 #include "filehash.h"
  21
  22 static char fio_version_string[] = "fio 1.21";
  23
  24 #define FIO_RANDSEED            (0xb1899bedUL)
  25
  26 static char **ini_file;
  27 static int max_jobs = MAX_JOBS;
  28 static int dump_cmdline;
  29
  30 struct thread_data def_thread;
  31 struct thread_data *threads = NULL;
  32
  33 int exitall_on_terminate = 0;
  34 int terse_output = 0;
  35 int eta_print;
  36 unsigned long long mlock_size = 0;
  37 FILE *f_out = NULL;
  38 FILE *f_err = NULL;
  39 char *job_section = NULL;
  40
  41 int write_bw_log = 0;
  42 int read_only = 0;
  43
  44 static int def_timeout;
  45 static int write_lat_log;
  46
  47 static int prev_group_jobs;
  48
  49 unsigned long fio_debug = 0;
  50 unsigned int fio_debug_jobno = -1;
  51 unsigned int *fio_debug_jobp = NULL;
  52
  53 /*
  54  * Command line options. These will contain the above, plus a few
  55  * extra that only pertain to fio itself and not jobs.
  56  */
  57 static struct option l_opts[FIO_NR_OPTIONS] = {
  58         {
  59                 .name           = "output",
  60                 .has_arg        = required_argument,
  61                 .val            = 'o',
  62         },
  63         {
  64                 .name           = "timeout",
  65                 .has_arg        = required_argument,
  66                 .val            = 't',
  67         },
  68         {
  69                 .name           = "latency-log",
  70                 .has_arg        = required_argument,
  71                 .val            = 'l',
  72         },
  73         {
  74                 .name           = "bandwidth-log",
  75                 .has_arg        = required_argument,
  76                 .val            = 'b',
  77         },
  78         {
  79                 .name           = "minimal",
  80                 .has_arg        = optional_argument,
  81                 .val            = 'm',
  82         },
  83         {
  84                 .name           = "version",
  85                 .has_arg        = no_argument,
  86                 .val            = 'v',
  87         },
  88         {
  89                 .name           = "help",
  90                 .has_arg        = no_argument,
  91                 .val            = 'h',
  92         },
  93         {
  94                 .name           = "cmdhelp",
  95                 .has_arg        = optional_argument,
  96                 .val            = 'c',
  97         },
  98         {
  99                 .name           = "showcmd",
 100                 .has_arg        = no_argument,
 101                 .val            = 's',
 102         },
 103         {
 104                 .name           = "readonly",
 105                 .has_arg        = no_argument,
 106                 .val            = 'r',
 107         },
 108         {
 109                 .name           = "eta",
 110                 .has_arg        = required_argument,
 111                 .val            = 'e',
 112         },
 113         {
 114                 .name           = "debug",
 115                 .has_arg        = required_argument,
 116                 .val            = 'd',
 117         },
 118         {
 119                 .name           = "section",
 120                 .has_arg        = required_argument,
 121                 .val            = 'x',
 122         },
 123         {
 124                 .name           = "alloc-size",
 125                 .has_arg        = required_argument,
 126                 .val            = 'a',
 127         },
 128         {
 129                 .name           = NULL,
 130         },
 131 };
 132
 133 FILE *get_f_out()
 134 {
 135         return f_out;
 136 }
 137
 138 FILE *get_f_err()
 139 {
 140         return f_err;
 141 }
 142
 143 /*
 144  * Return a free job structure.
 145  */
 146 static struct thread_data *get_new_job(int global, struct thread_data *parent)
 147 {
 148         struct thread_data *td;
 149
 150         if (global)
 151                 return &def_thread;
 152         if (thread_number >= max_jobs)
 153                 return NULL;
 154
 155         td = &threads[thread_number++];
 156         *td = *parent;
 157
 158         dup_files(td, parent);
 159         options_mem_dupe(td);
 160
 161         td->thread_number = thread_number;
 162         return td;
 163 }
 164
 165 static void put_job(struct thread_data *td)
 166 {
 167         if (td == &def_thread)
 168                 return;
 169
 170         if (td->error)
 171                 log_info("fio: %s\n", td->verror);
 172
 173         memset(&threads[td->thread_number - 1], 0, sizeof(*td));
 174         thread_number--;
 175 }
 176
 177 static int setup_rate(struct thread_data *td)
 178 {
 179         unsigned long nr_reads_per_msec;
 180         unsigned long long rate;
 181         unsigned int bs;
 182
 183         if (!td->o.rate && !td->o.rate_iops)
 184                 return 0;
 185
 186         if (td_rw(td))
 187                 bs = td->o.rw_min_bs;
 188         else if (td_read(td))
 189                 bs = td->o.min_bs[DDIR_READ];
 190         else
 191                 bs = td->o.min_bs[DDIR_WRITE];
 192
 193         if (td->o.rate) {
 194                 rate = td->o.rate;
 195                 nr_reads_per_msec = (rate * 1024 * 1000LL) / bs;
 196         } else
 197                 nr_reads_per_msec = td->o.rate_iops * 1000UL;
 198
 199         if (!nr_reads_per_msec) {
 200                 log_err("rate lower than supported\n");
 201                 return -1;
 202         }
 203
 204         td->rate_usec_cycle = 1000000000ULL / nr_reads_per_msec;
 205         td->rate_pending_usleep = 0;
 206         return 0;
 207 }
 208
 209 /*
 210  * Lazy way of fixing up options that depend on each other. We could also
 211  * define option callback handlers, but this is easier.
 212  */
 213 static int fixup_options(struct thread_data *td)
 214 {
 215         struct thread_options *o = &td->o;
 216
 217         if (read_only && td_write(td)) {
 218                 log_err("fio: job <%s> has write bit set, but fio is in"
 219                         " read-only mode\n", td->o.name);
 220                 return 1;
 221         }
 222
 223         if (o->write_iolog_file && o->read_iolog_file) {
 224                 log_err("fio: read iolog overrides write_iolog\n");
 225                 free(o->write_iolog_file);
 226                 o->write_iolog_file = NULL;
 227         }
 228
 229         /*
 230          * only really works for sequential io for now, and with 1 file
 231          */
 232         if (o->zone_size && td_random(td) && o->open_files == 1)
 233                 o->zone_size = 0;
 234
 235         /*
 236          * Reads can do overwrites, we always need to pre-create the file
 237          */
 238         if (td_read(td) || td_rw(td))
 239                 o->overwrite = 1;
 240
 241         if (!o->min_bs[DDIR_READ])
 242                 o->min_bs[DDIR_READ] = o->bs[DDIR_READ];
 243         if (!o->max_bs[DDIR_READ])
 244                 o->max_bs[DDIR_READ] = o->bs[DDIR_READ];
 245         if (!o->min_bs[DDIR_WRITE])
 246                 o->min_bs[DDIR_WRITE] = o->bs[DDIR_WRITE];
 247         if (!o->max_bs[DDIR_WRITE])
 248                 o->max_bs[DDIR_WRITE] = o->bs[DDIR_WRITE];
 249
 250         o->rw_min_bs = min(o->min_bs[DDIR_READ], o->min_bs[DDIR_WRITE]);
 251
 252         if (!o->file_size_high)
 253                 o->file_size_high = o->file_size_low;
 254
 255         if (o->norandommap && o->verify != VERIFY_NONE) {
 256                 log_err("fio: norandommap given, verify disabled\n");
 257                 o->verify = VERIFY_NONE;
 258         }
 259         if (o->bs_unaligned && (o->odirect || td->io_ops->flags & FIO_RAWIO))
 260                 log_err("fio: bs_unaligned may not work with raw io\n");
 261
 262         /*
 263          * thinktime_spin must be less than thinktime
 264          */
 265         if (o->thinktime_spin > o->thinktime)
 266                 o->thinktime_spin = o->thinktime;
 267
 268         /*
 269          * The low water mark cannot be bigger than the iodepth
 270          */
 271         if (o->iodepth_low > o->iodepth || !o->iodepth_low) {
 272                 /*
 273                  * syslet work around - if the workload is sequential,
 274                  * we want to let the queue drain all the way down to
 275                  * avoid seeking between async threads
 276                  */
 277                 if (!strcmp(td->io_ops->name, "syslet-rw") && !td_random(td))
 278                         o->iodepth_low = 1;
 279                 else
 280                         o->iodepth_low = o->iodepth;
 281         }
 282
 283         /*
 284          * If batch number isn't set, default to the same as iodepth
 285          */
 286         if (o->iodepth_batch > o->iodepth || !o->iodepth_batch)
 287                 o->iodepth_batch = o->iodepth;
 288
 289         if (o->nr_files > td->files_index)
 290                 o->nr_files = td->files_index;
 291
 292         if (o->open_files > o->nr_files || !o->open_files)
 293                 o->open_files = o->nr_files;
 294
 295         if ((o->rate && o->rate_iops) || (o->ratemin && o->rate_iops_min)) {
 296                 log_err("fio: rate and rate_iops are mutually exclusive\n");
 297                 return 1;
 298         }
 299         if ((o->rate < o->ratemin) || (o->rate_iops < o->rate_iops_min)) {
 300                 log_err("fio: minimum rate exceeds rate\n");
 301                 return 1;
 302         }
 303
 304         if (!o->timeout && o->time_based) {
 305                 log_err("fio: time_based requires a runtime/timeout setting\n");
 306                 o->time_based = 0;
 307         }
 308
 309         if (o->fill_device && !o->size)
 310                 o->size = -1ULL;
 311
 312         if (td_rw(td) && td->o.verify != VERIFY_NONE)
 313                 log_info("fio: mixed read/write workload with verify. May not "
 314                  "work as expected, unless you pre-populated the file\n");
 315
 316         if (td->o.verify != VERIFY_NONE)
 317                 td->o.refill_buffers = 1;
 318
 319         return 0;
 320 }
 321
 322 /*
 323  * This function leaks the buffer
 324  */
 325 static char *to_kmg(unsigned int val)
 326 {
 327         char *buf = malloc(32);
 328         char post[] = { 0, 'K', 'M', 'G', 'P', 'E', 0 };
 329         char *p = post;
 330
 331         do {
 332                 if (val & 1023)
 333                         break;
 334
 335                 val >>= 10;
 336                 p++;
 337         } while (*p);
 338
 339         snprintf(buf, 31, "%u%c", val, *p);
 340         return buf;
 341 }
 342
 343 /* External engines are specified by "external:name.o") */
 344 static const char *get_engine_name(const char *str)
 345 {
 346         char *p = strstr(str, ":");
 347
 348         if (!p)
 349                 return str;
 350
 351         p++;
 352         strip_blank_front(&p);
 353         strip_blank_end(p);
 354         return p;
 355 }
 356
 357 static int exists_and_not_file(const char *filename)
 358 {
 359         struct stat sb;
 360
 361         if (lstat(filename, &sb) == -1)
 362                 return 0;
 363
 364         if (S_ISREG(sb.st_mode))
 365                 return 0;
 366
 367         return 1;
 368 }
 369
 370 /*
 371  * Initialize the various random states we need (random io, block size ranges,
 372  * read/write mix, etc).
 373  */
 374 static int init_random_state(struct thread_data *td)
 375 {
 376         unsigned long seeds[6];
 377         int fd;
 378
 379         fd = open("/dev/urandom", O_RDONLY);
 380         if (fd == -1) {
 381                 td_verror(td, errno, "open");
 382                 return 1;
 383         }
 384
 385         if (read(fd, seeds, sizeof(seeds)) < (int) sizeof(seeds)) {
 386                 td_verror(td, EIO, "read");
 387                 close(fd);
 388                 return 1;
 389         }
 390
 391         close(fd);
 392
 393         os_random_seed(seeds[0], &td->bsrange_state);
 394         os_random_seed(seeds[1], &td->verify_state);
 395         os_random_seed(seeds[2], &td->rwmix_state);
 396
 397         if (td->o.file_service_type == FIO_FSERVICE_RANDOM)
 398                 os_random_seed(seeds[3], &td->next_file_state);
 399
 400         os_random_seed(seeds[5], &td->file_size_state);
 401
 402         if (!td_random(td))
 403                 return 0;
 404
 405         if (td->o.rand_repeatable)
 406                 seeds[4] = FIO_RANDSEED * td->thread_number;
 407
 408         os_random_seed(seeds[4], &td->random_state);
 409         return 0;
 410 }
 411
 412 /*
 413  * Adds a job to the list of things todo. Sanitizes the various options
 414  * to make sure we don't have conflicts, and initializes various
 415  * members of td.
 416  */
 417 static int add_job(struct thread_data *td, const char *jobname, int job_add_num)
 418 {
 419         const char *ddir_str[] = { NULL, "read", "write", "rw", NULL,
 420                                    "randread", "randwrite", "randrw" };
 421         unsigned int i;
 422         const char *engine;
 423         char fname[PATH_MAX];
 424         int numjobs, file_alloced;
 425
 426         /*
 427          * the def_thread is just for options, it's not a real job
 428          */
 429         if (td == &def_thread)
 430                 return 0;
 431
 432         /*
 433          * if we are just dumping the output command line, don't add the job
 434          */
 435         if (dump_cmdline) {
 436                 put_job(td);
 437                 return 0;
 438         }
 439
 440         engine = get_engine_name(td->o.ioengine);
 441         td->io_ops = load_ioengine(td, engine);
 442         if (!td->io_ops) {
 443                 log_err("fio: failed to load engine %s\n", engine);
 444                 goto err;
 445         }
 446
 447         if (td->o.use_thread)
 448                 nr_thread++;
 449         else
 450                 nr_process++;
 451
 452         if (td->o.odirect)
 453                 td->io_ops->flags |= FIO_RAWIO;
 454
 455         file_alloced = 0;
 456         if (!td->o.filename && !td->files_index && !td->o.read_iolog_file) {
 457                 file_alloced = 1;
 458
 459                 if (td->o.nr_files == 1 && exists_and_not_file(jobname))
 460                         add_file(td, jobname);
 461                 else {
 462                         for (i = 0; i < td->o.nr_files; i++) {
 463                                 sprintf(fname, "%s.%d.%d", jobname,
 464                                                         td->thread_number, i);
 465                                 add_file(td, fname);
 466                         }
 467                 }
 468         }
 469
 470         if (fixup_options(td))
 471                 goto err;
 472
 473         if (td->io_ops->flags & FIO_DISKLESSIO) {
 474                 struct fio_file *f;
 475
 476                 for_each_file(td, f, i)
 477                         f->real_file_size = -1ULL;
 478         }
 479
 480         td->mutex = fio_mutex_init(0);
 481
 482         td->ts.clat_stat[0].min_val = td->ts.clat_stat[1].min_val = ULONG_MAX;
 483         td->ts.slat_stat[0].min_val = td->ts.slat_stat[1].min_val = ULONG_MAX;
 484         td->ts.bw_stat[0].min_val = td->ts.bw_stat[1].min_val = ULONG_MAX;
 485         td->ddir_nr = td->o.ddir_nr;
 486
 487         if ((td->o.stonewall || td->o.numjobs > 1 || td->o.new_group)
 488              && prev_group_jobs) {
 489                 prev_group_jobs = 0;
 490                 groupid++;
 491         }
 492
 493         td->groupid = groupid;
 494         prev_group_jobs++;
 495
 496         if (init_random_state(td))
 497                 goto err;
 498
 499         if (setup_rate(td))
 500                 goto err;
 501
 502         if (td->o.write_lat_log) {
 503                 setup_log(&td->ts.slat_log);
 504                 setup_log(&td->ts.clat_log);
 505         }
 506         if (td->o.write_bw_log)
 507                 setup_log(&td->ts.bw_log);
 508
 509         if (!td->o.name)
 510                 td->o.name = strdup(jobname);
 511
 512         if (!terse_output) {
 513                 if (!job_add_num) {
 514                         if (!strcmp(td->io_ops->name, "cpuio")) {
 515                                 log_info("%s: ioengine=cpu, cpuload=%u,"
 516                                          " cpucycle=%u\n", td->o.name,
 517                                                         td->o.cpuload,
 518                                                         td->o.cpucycle);
 519                         } else {
 520                                 char *c1, *c2, *c3, *c4;
 521
 522                                 c1 = to_kmg(td->o.min_bs[DDIR_READ]);
 523                                 c2 = to_kmg(td->o.max_bs[DDIR_READ]);
 524                                 c3 = to_kmg(td->o.min_bs[DDIR_WRITE]);
 525                                 c4 = to_kmg(td->o.max_bs[DDIR_WRITE]);
 526
 527                                 log_info("%s: (g=%d): rw=%s, bs=%s-%s/%s-%s,"
 528                                          " ioengine=%s, iodepth=%u\n",
 529                                                 td->o.name, td->groupid,
 530                                                 ddir_str[td->o.td_ddir],
 531                                                 c1, c2, c3, c4,
 532                                                 td->io_ops->name,
 533                                                 td->o.iodepth);
 534
 535                                 free(c1);
 536                                 free(c2);
 537                                 free(c3);
 538                                 free(c4);
 539                         }
 540                 } else if (job_add_num == 1)
 541                         log_info("...\n");
 542         }
 543
 544         /*
 545          * recurse add identical jobs, clear numjobs and stonewall options
 546          * as they don't apply to sub-jobs
 547          */
 548         numjobs = td->o.numjobs;
 549         while (--numjobs) {
 550                 struct thread_data *td_new = get_new_job(0, td);
 551
 552                 if (!td_new)
 553                         goto err;
 554
 555                 td_new->o.numjobs = 1;
 556                 td_new->o.stonewall = 0;
 557                 td_new->o.new_group = 0;
 558
 559                 if (file_alloced) {
 560                         td_new->o.filename = NULL;
 561                         td_new->files_index = 0;
 562                         td_new->files = NULL;
 563                 }
 564
 565                 job_add_num = numjobs - 1;
 566
 567                 if (add_job(td_new, jobname, job_add_num))
 568                         goto err;
 569         }
 570
 571         return 0;
 572 err:
 573         put_job(td);
 574         return -1;
 575 }
 576
 577 static int skip_this_section(const char *name)
 578 {
 579         if (!job_section)
 580                 return 0;
 581         if (!strncmp(name, "global", 6))
 582                 return 0;
 583
 584         return strncmp(job_section, name, strlen(job_section));
 585 }
 586
 587 static int is_empty_or_comment(char *line)
 588 {
 589         unsigned int i;
 590
 591         for (i = 0; i < strlen(line); i++) {
 592                 if (line[i] == ';')
 593                         return 1;
 594                 if (line[i] == '#')
 595                         return 1;
 596                 if (!isspace(line[i]) && !iscntrl(line[i]))
 597                         return 0;
 598         }
 599
 600         return 1;
 601 }
 602
 603 /*
 604  * This is our [ini] type file parser.
 605  */
 606 static int parse_jobs_ini(char *file, int stonewall_flag)
 607 {
 608         unsigned int global;
 609         struct thread_data *td;
 610         char *string, *name;
 611         FILE *f;
 612         char *p;
 613         int ret = 0, stonewall;
 614         int first_sect = 1;
 615         int skip_fgets = 0;
 616         int inside_skip = 0;
 617         char **opts;
 618         int i, alloc_opts, num_opts;
 619
 620         if (!strcmp(file, "-"))
 621                 f = stdin;
 622         else
 623                 f = fopen(file, "r");
 624
 625         if (!f) {
 626                 perror("fopen job file");
 627                 return 1;
 628         }
 629
 630         string = malloc(4096);
 631
 632         /*
 633          * it's really 256 + small bit, 280 should suffice
 634          */
 635         name = malloc(280);
 636         memset(name, 0, 280);
 637
 638         alloc_opts = 8;
 639         opts = malloc(sizeof(char *) * alloc_opts);
 640
 641         stonewall = stonewall_flag;
 642         do {
 643                 /*
 644                  * if skip_fgets is set, we already have loaded a line we
 645                  * haven't handled.
 646                  */
 647                 if (!skip_fgets) {
 648                         p = fgets(string, 4095, f);
 649                         if (!p)
 650                                 break;
 651                 }
 652
 653                 skip_fgets = 0;
 654                 strip_blank_front(&p);
 655                 strip_blank_end(p);
 656
 657                 if (is_empty_or_comment(p))
 658                         continue;
 659                 if (sscanf(p, "[%255s]", name) != 1) {
 660                         if (inside_skip)
 661                                 continue;
 662                         log_err("fio: option <%s> outside of [] job section\n",
 663                                                                         p);
 664                         break;
 665                 }
 666
 667                 if (skip_this_section(name)) {
 668                         inside_skip = 1;
 669                         continue;
 670                 } else
 671                         inside_skip = 0;
 672
 673                 global = !strncmp(name, "global", 6);
 674
 675                 name[strlen(name) - 1] = '\0';
 676
 677                 if (dump_cmdline) {
 678                         if (first_sect)
 679                                 log_info("fio ");
 680                         if (!global)
 681                                 log_info("--name=%s ", name);
 682                         first_sect = 0;
 683                 }
 684
 685                 td = get_new_job(global, &def_thread);
 686                 if (!td) {
 687                         ret = 1;
 688                         break;
 689                 }
 690
 691                 /*
 692                  * Seperate multiple job files by a stonewall
 693                  */
 694                 if (!global && stonewall) {
 695                         td->o.stonewall = stonewall;
 696                         stonewall = 0;
 697                 }
 698
 699                 num_opts = 0;
 700                 memset(opts, 0, alloc_opts * sizeof(char *));
 701
 702                 while ((p = fgets(string, 4096, f)) != NULL) {
 703                         if (is_empty_or_comment(p))
 704                                 continue;
 705
 706                         strip_blank_front(&p);
 707
 708                         /*
 709                          * new section, break out and make sure we don't
 710                          * fgets() a new line at the top.
 711                          */
 712                         if (p[0] == '[') {
 713                                 skip_fgets = 1;
 714                                 break;
 715                         }
 716
 717                         strip_blank_end(p);
 718
 719                         if (num_opts == alloc_opts) {
 720                                 alloc_opts <<= 1;
 721                                 opts = realloc(opts,
 722                                                 alloc_opts * sizeof(char *));
 723                         }
 724
 725                         opts[num_opts] = strdup(p);
 726                         num_opts++;
 727                 }
 728
 729                 ret = fio_options_parse(td, opts, num_opts);
 730                 if (!ret) {
 731                         if (dump_cmdline)
 732                                 for (i = 0; i < num_opts; i++)
 733                                         log_info("--%s ", opts[i]);
 734
 735                         ret = add_job(td, name, 0);
 736                 } else {
 737                         log_err("fio: job %s dropped\n", name);
 738                         put_job(td);
 739                 }
 740
 741                 for (i = 0; i < num_opts; i++)
 742                         free(opts[i]);
 743                 num_opts = 0;
 744         } while (!ret);
 745
 746         if (dump_cmdline)
 747                 log_info("\n");
 748
 749         for (i = 0; i < num_opts; i++)
 750                 free(opts[i]);
 751
 752         free(string);
 753         free(name);
 754         if (f != stdin)
 755                 fclose(f);
 756         return ret;
 757 }
 758
 759 static int fill_def_thread(void)
 760 {
 761         memset(&def_thread, 0, sizeof(def_thread));
 762
 763         fio_getaffinity(getpid(), &def_thread.o.cpumask);
 764
 765         /*
 766          * fill default options
 767          */
 768         fio_fill_default_options(&def_thread);
 769
 770         def_thread.o.timeout = def_timeout;
 771         def_thread.o.write_bw_log = write_bw_log;
 772         def_thread.o.write_lat_log = write_lat_log;
 773
 774         return 0;
 775 }
 776
 777 static void free_shm(void)
 778 {
 779         struct shmid_ds sbuf;
 780
 781         if (threads) {
 782                 void *tp = threads;
 783
 784                 threads = NULL;
 785                 file_hash_exit();
 786                 fio_debug_jobp = NULL;
 787                 shmdt(tp);
 788                 shmctl(shm_id, IPC_RMID, &sbuf);
 789         }
 790
 791         scleanup();
 792 }
 793
 794 /*
 795  * The thread area is shared between the main process and the job
 796  * threads/processes. So setup a shared memory segment that will hold
 797  * all the job info. We use the end of the region for keeping track of
 798  * open files across jobs, for file sharing.
 799  */
 800 static int setup_thread_area(void)
 801 {
 802         void *hash;
 803
 804         /*
 805          * 1024 is too much on some machines, scale max_jobs if
 806          * we get a failure that looks like too large a shm segment
 807          */
 808         do {
 809                 size_t size = max_jobs * sizeof(struct thread_data);
 810
 811                 size += file_hash_size;
 812                 size += sizeof(unsigned int);
 813
 814                 shm_id = shmget(0, size, IPC_CREAT | 0600);
 815                 if (shm_id != -1)
 816                         break;
 817                 if (errno != EINVAL) {
 818                         perror("shmget");
 819                         break;
 820                 }
 821
 822                 max_jobs >>= 1;
 823         } while (max_jobs);
 824
 825         if (shm_id == -1)
 826                 return 1;
 827
 828         threads = shmat(shm_id, NULL, 0);
 829         if (threads == (void *) -1) {
 830                 perror("shmat");
 831                 return 1;
 832         }
 833
 834         memset(threads, 0, max_jobs * sizeof(struct thread_data));
 835         hash = (void *) threads + max_jobs * sizeof(struct thread_data);
 836         fio_debug_jobp = (void *) hash + file_hash_size;
 837         *fio_debug_jobp = -1;
 838         file_hash_init(hash);
 839         atexit(free_shm);
 840         return 0;
 841 }
 842
 843 static void usage(const char *name)
 844 {
 845         printf("%s\n", fio_version_string);
 846         printf("%s [options] [job options] <job file(s)>\n", name);
 847         printf("\t--debug=options\tEnable debug logging\n");
 848         printf("\t--output\tWrite output to file\n");
 849         printf("\t--timeout\tRuntime in seconds\n");
 850         printf("\t--latency-log\tGenerate per-job latency logs\n");
 851         printf("\t--bandwidth-log\tGenerate per-job bandwidth logs\n");
 852         printf("\t--minimal\tMinimal (terse) output\n");
 853         printf("\t--version\tPrint version info and exit\n");
 854         printf("\t--help\t\tPrint this page\n");
 855         printf("\t--cmdhelp=cmd\tPrint command help, \"all\" for all of"
 856                 " them\n");
 857         printf("\t--showcmd\tTurn a job file into command line options\n");
 858         printf("\t--eta=when\tWhen ETA estimate should be printed\n");
 859         printf("\t          \tMay be \"always\", \"never\" or \"auto\"\n");
 860         printf("\t--readonly\tTurn on safety read-only checks, preventing"
 861                 " writes\n");
 862         printf("\t--section=name\tOnly run specified section in job file\n");
 863         printf("\t--alloc-size=kb\tSet smalloc pool to this size in kb"
 864                 " (def 1024)\n");
 865 }
 866
 867 #ifdef FIO_INC_DEBUG
 868 struct debug_level debug_levels[] = {
 869         { .name = "process",    .shift = FD_PROCESS, },
 870         { .name = "file",       .shift = FD_FILE, },
 871         { .name = "io",         .shift = FD_IO, },
 872         { .name = "mem",        .shift = FD_MEM, },
 873         { .name = "blktrace",   .shift = FD_BLKTRACE },
 874         { .name = "verify",     .shift = FD_VERIFY },
 875         { .name = "random",     .shift = FD_RANDOM },
 876         { .name = "parse",      .shift = FD_PARSE },
 877         { .name = "diskutil",   .shift = FD_DISKUTIL },
 878         { .name = "job",        .shift = FD_JOB },
 879         { },
 880 };
 881
 882 static int set_debug(const char *string)
 883 {
 884         struct debug_level *dl;
 885         char *p = (char *) string;
 886         char *opt;
 887         int i;
 888
 889         if (!strcmp(string, "?") || !strcmp(string, "help")) {
 890                 int i;
 891
 892                 log_info("fio: dumping debug options:");
 893                 for (i = 0; debug_levels[i].name; i++) {
 894                         dl = &debug_levels[i];
 895                         log_info("%s,", dl->name);
 896                 }
 897                 log_info("all\n");
 898                 return 1;
 899         }
 900
 901         while ((opt = strsep(&p, ",")) != NULL) {
 902                 int found = 0;
 903
 904                 if (!strncmp(opt, "all", 3)) {
 905                         log_info("fio: set all debug options\n");
 906                         fio_debug = ~0UL;
 907                         continue;
 908                 }
 909
 910                 for (i = 0; debug_levels[i].name; i++) {
 911                         dl = &debug_levels[i];
 912                         found = !strncmp(opt, dl->name, strlen(dl->name));
 913                         if (!found)
 914                                 continue;
 915
 916                         if (dl->shift == FD_JOB) {
 917                                 opt = strchr(opt, ':');
 918                                 if (!opt) {
 919                                         log_err("fio: missing job number\n");
 920                                         break;
 921                                 }
 922                                 opt++;
 923                                 fio_debug_jobno = atoi(opt);
 924                                 log_info("fio: set debug jobno %d\n",
 925                                                         fio_debug_jobno);
 926                         } else {
 927                                 log_info("fio: set debug option %s\n", opt);
 928                                 fio_debug |= (1UL << dl->shift);
 929                         }
 930                         break;
 931                 }
 932
 933                 if (!found)
 934                         log_err("fio: debug mask %s not found\n", opt);
 935         }
 936         return 0;
 937 }
 938 #else
 939 static int set_debug(const char *string)
 940 {
 941         log_err("fio: debug tracing not included in build\n");
 942         return 1;
 943 }
 944 #endif
 945
 946 static int parse_cmd_line(int argc, char *argv[])
 947 {
 948         struct thread_data *td = NULL;
 949         int c, ini_idx = 0, lidx, ret = 0, do_exit = 0, exit_val = 0;
 950
 951         while ((c = getopt_long_only(argc, argv, "", l_opts, &lidx)) != -1) {
 952                 switch (c) {
 953                 case 'a':
 954                         smalloc_pool_size = atoi(optarg);
 955                         break;
 956                 case 't':
 957                         def_timeout = atoi(optarg);
 958                         break;
 959                 case 'l':
 960                         write_lat_log = 1;
 961                         break;
 962                 case 'w':
 963                         write_bw_log = 1;
 964                         break;
 965                 case 'o':
 966                         f_out = fopen(optarg, "w+");
 967                         if (!f_out) {
 968                                 perror("fopen output");
 969                                 exit(1);
 970                         }
 971                         f_err = f_out;
 972                         break;
 973                 case 'm':
 974                         terse_output = 1;
 975                         break;
 976                 case 'h':
 977                         usage(argv[0]);
 978                         exit(0);
 979                 case 'c':
 980                         exit(fio_show_option_help(optarg));
 981                 case 's':
 982                         dump_cmdline = 1;
 983                         break;
 984                 case 'r':
 985                         read_only = 1;
 986                         break;
 987                 case 'v':
 988                         printf("%s\n", fio_version_string);
 989                         exit(0);
 990                 case 'e':
 991                         if (!strcmp("always", optarg))
 992                                 eta_print = FIO_ETA_ALWAYS;
 993                         else if (!strcmp("never", optarg))
 994                                 eta_print = FIO_ETA_NEVER;
 995                         break;
 996                 case 'd':
 997                         if (set_debug(optarg))
 998                                 do_exit++;
 999                         break;
1000                 case 'x':
1001                         if (!strcmp(optarg, "global")) {
1002                                 log_err("fio: can't use global as only "
1003                                         "section\n");
1004                                 do_exit++;
1005                                 exit_val = 1;
1006                                 break;
1007                         }
1008                         if (job_section)
1009                                 free(job_section);
1010                         job_section = strdup(optarg);
1011                         break;
1012                 case FIO_GETOPT_JOB: {
1013                         const char *opt = l_opts[lidx].name;
1014                         char *val = optarg;
1015
1016                         if (!strncmp(opt, "name", 4) && td) {
1017                                 ret = add_job(td, td->o.name ?: "fio", 0);
1018                                 if (ret) {
1019                                         put_job(td);
1020                                         return 0;
1021                                 }
1022                                 td = NULL;
1023                         }
1024                         if (!td) {
1025                                 int is_section = !strncmp(opt, "name", 4);
1026                                 int global = 0;
1027
1028                                 if (!is_section || !strncmp(val, "global", 6))
1029                                         global = 1;
1030
1031                                 if (is_section && skip_this_section(val))
1032                                         continue;
1033
1034                                 td = get_new_job(global, &def_thread);
1035                                 if (!td)
1036                                         return 0;
1037                         }
1038
1039                         ret = fio_cmd_option_parse(td, opt, val);
1040                         break;
1041                 }
1042                 default:
1043                         do_exit++;
1044                         exit_val = 1;
1045                         break;
1046                 }
1047         }
1048
1049         if (do_exit)
1050                 exit(exit_val);
1051
1052         if (td) {
1053                 if (!ret)
1054                         ret = add_job(td, td->o.name ?: "fio", 0);
1055                 if (ret)
1056                         put_job(td);
1057         }
1058
1059         while (optind < argc) {
1060                 ini_idx++;
1061                 ini_file = realloc(ini_file, ini_idx * sizeof(char *));
1062                 ini_file[ini_idx - 1] = strdup(argv[optind]);
1063                 optind++;
1064         }
1065
1066         return ini_idx;
1067 }
1068
1069 int parse_options(int argc, char *argv[])
1070 {
1071         int job_files, i;
1072
1073         f_out = stdout;
1074         f_err = stderr;
1075
1076         fio_options_dup_and_init(l_opts);
1077
1078         if (setup_thread_area())
1079                 return 1;
1080         if (fill_def_thread())
1081                 return 1;
1082
1083         job_files = parse_cmd_line(argc, argv);
1084
1085         for (i = 0; i < job_files; i++) {
1086                 if (fill_def_thread())
1087                         return 1;
1088                 if (parse_jobs_ini(ini_file[i], i))
1089                         return 1;
1090                 free(ini_file[i]);
1091         }
1092
1093         free(ini_file);
1094         options_mem_free(&def_thread);
1095
1096         if (!thread_number) {
1097                 if (dump_cmdline)
1098                         return 0;
1099
1100                 log_err("No jobs defined(s)\n");
1101                 usage(argv[0]);
1102                 return 1;
1103         }
1104
1105         return 0;
1106 }