fio.c

   1 /*
   2  * fio - the flexible io tester
   3  *
   4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
   5  * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <string.h>
  25 #include <signal.h>
  26 #include <time.h>
  27 #include <assert.h>
  28 #include <sys/stat.h>
  29 #include <sys/wait.h>
  30 #include <sys/ipc.h>
  31 #include <sys/shm.h>
  32 #include <sys/ioctl.h>
  33 #include <sys/mman.h>
  34
  35 #include "fio.h"
  36 #include "os.h"
  37
  38 #define MASK    (4095)
  39
  40 #define ALIGN(buf)      (char *) (((unsigned long) (buf) + MASK) & ~(MASK))
  41
  42 int groupid = 0;
  43 int thread_number = 0;
  44 int shm_id = 0;
  45 int temp_stall_ts;
  46 char *fio_inst_prefix = _INST_PREFIX;
  47
  48 static volatile int startup_sem;
  49
  50 #define TERMINATE_ALL           (-1)
  51 #define JOB_START_TIMEOUT       (5 * 1000)
  52
  53 static void terminate_threads(int group_id)
  54 {
  55         struct thread_data *td;
  56         int i;
  57
  58         for_each_td(td, i) {
  59                 if (group_id == TERMINATE_ALL || groupid == td->groupid) {
  60                         td->terminate = 1;
  61                         td->start_delay = 0;
  62                 }
  63         }
  64 }
  65
  66 static void sig_handler(int sig)
  67 {
  68         switch (sig) {
  69                 case SIGALRM:
  70                         update_io_ticks();
  71                         disk_util_timer_arm();
  72                         print_thread_status();
  73                         break;
  74                 default:
  75                         printf("\nfio: terminating on signal\n");
  76                         fflush(stdout);
  77                         terminate_threads(TERMINATE_ALL);
  78                         break;
  79         }
  80 }
  81
  82 /*
  83  * Check if we are above the minimum rate given.
  84  */
  85 static int check_min_rate(struct thread_data *td, struct timeval *now)
  86 {
  87         unsigned long spent;
  88         unsigned long rate;
  89         int ddir = td->ddir;
  90
  91         /*
  92          * allow a 2 second settle period in the beginning
  93          */
  94         if (mtime_since(&td->start, now) < 2000)
  95                 return 0;
  96
  97         /*
  98          * if rate blocks is set, sample is running
  99          */
 100         if (td->rate_bytes) {
 101                 spent = mtime_since(&td->lastrate, now);
 102                 if (spent < td->ratecycle)
 103                         return 0;
 104
 105                 rate = (td->this_io_bytes[ddir] - td->rate_bytes) / spent;
 106                 if (rate < td->ratemin) {
 107                         fprintf(f_out, "%s: min rate %d not met, got %ldKiB/sec\n", td->name, td->ratemin, rate);
 108                         return 1;
 109                 }
 110         }
 111
 112         td->rate_bytes = td->this_io_bytes[ddir];
 113         memcpy(&td->lastrate, now, sizeof(*now));
 114         return 0;
 115 }
 116
 117 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
 118 {
 119         if (!td->timeout)
 120                 return 0;
 121         if (mtime_since(&td->epoch, t) >= td->timeout * 1000)
 122                 return 1;
 123
 124         return 0;
 125 }
 126
 127 static inline void td_set_runstate(struct thread_data *td, int runstate)
 128 {
 129         td->runstate = runstate;
 130 }
 131
 132 static struct fio_file *get_next_file(struct thread_data *td)
 133 {
 134         unsigned int old_next_file = td->next_file;
 135         struct fio_file *f;
 136
 137         do {
 138                 f = &td->files[td->next_file];
 139
 140                 td->next_file++;
 141                 if (td->next_file >= td->nr_files)
 142                         td->next_file = 0;
 143
 144                 if (f->fd != -1)
 145                         break;
 146
 147                 f = NULL;
 148         } while (td->next_file != old_next_file);
 149
 150         return f;
 151 }
 152
 153 /*
 154  * When job exits, we can cancel the in-flight IO if we are using async
 155  * io. Attempt to do so.
 156  */
 157 static void cleanup_pending_aio(struct thread_data *td)
 158 {
 159         struct timespec ts = { .tv_sec = 0, .tv_nsec = 0};
 160         struct list_head *entry, *n;
 161         struct io_completion_data icd;
 162         struct io_u *io_u;
 163         int r;
 164
 165         /*
 166          * get immediately available events, if any
 167          */
 168         r = td_io_getevents(td, 0, td->cur_depth, &ts);
 169         if (r > 0) {
 170                 icd.nr = r;
 171                 ios_completed(td, &icd);
 172         }
 173
 174         /*
 175          * now cancel remaining active events
 176          */
 177         if (td->io_ops->cancel) {
 178                 list_for_each_safe(entry, n, &td->io_u_busylist) {
 179                         io_u = list_entry(entry, struct io_u, list);
 180
 181                         r = td->io_ops->cancel(td, io_u);
 182                         if (!r)
 183                                 put_io_u(td, io_u);
 184                 }
 185         }
 186
 187         if (td->cur_depth) {
 188                 r = td_io_getevents(td, td->cur_depth, td->cur_depth, NULL);
 189                 if (r > 0) {
 190                         icd.nr = r;
 191                         ios_completed(td, &icd);
 192                 }
 193         }
 194 }
 195
 196 /*
 197  * The main verify engine. Runs over the writes we previusly submitted,
 198  * reads the blocks back in, and checks the crc/md5 of the data.
 199  */
 200 void do_verify(struct thread_data *td)
 201 {
 202         struct timeval t;
 203         struct io_u *io_u, *v_io_u = NULL;
 204         struct io_completion_data icd;
 205         struct fio_file *f;
 206         int ret, i;
 207
 208         /*
 209          * sync io first and invalidate cache, to make sure we really
 210          * read from disk.
 211          */
 212         for_each_file(td, f, i) {
 213                 td_io_sync(td, f);
 214                 file_invalidate_cache(td, f);
 215         }
 216
 217         td_set_runstate(td, TD_VERIFYING);
 218
 219         do {
 220                 if (td->terminate)
 221                         break;
 222
 223                 gettimeofday(&t, NULL);
 224                 if (runtime_exceeded(td, &t))
 225                         break;
 226
 227                 io_u = __get_io_u(td);
 228                 if (!io_u)
 229                         break;
 230
 231                 if (get_next_verify(td, io_u)) {
 232                         put_io_u(td, io_u);
 233                         break;
 234                 }
 235
 236                 f = get_next_file(td);
 237                 if (!f)
 238                         break;
 239
 240                 io_u->file = f;
 241
 242                 if (td_io_prep(td, io_u)) {
 243                         put_io_u(td, io_u);
 244                         break;
 245                 }
 246
 247                 ret = td_io_queue(td, io_u);
 248                 if (ret) {
 249                         put_io_u(td, io_u);
 250                         td_verror(td, ret);
 251                         break;
 252                 }
 253
 254                 /*
 255                  * we have one pending to verify, do that while
 256                  * we are doing io on the next one
 257                  */
 258                 if (do_io_u_verify(td, &v_io_u))
 259                         break;
 260
 261                 ret = td_io_getevents(td, 1, 1, NULL);
 262                 if (ret != 1) {
 263                         if (ret < 0)
 264                                 td_verror(td, ret);
 265                         break;
 266                 }
 267
 268                 v_io_u = td->io_ops->event(td, 0);
 269                 icd.nr = 1;
 270                 icd.error = 0;
 271                 io_completed(td, v_io_u, &icd);
 272
 273                 if (icd.error) {
 274                         td_verror(td, icd.error);
 275                         put_io_u(td, v_io_u);
 276                         v_io_u = NULL;
 277                         break;
 278                 }
 279
 280                 /*
 281                  * if we can't submit more io, we need to verify now
 282                  */
 283                 if (queue_full(td) && do_io_u_verify(td, &v_io_u))
 284                         break;
 285
 286         } while (1);
 287
 288         do_io_u_verify(td, &v_io_u);
 289
 290         if (td->cur_depth)
 291                 cleanup_pending_aio(td);
 292
 293         td_set_runstate(td, TD_RUNNING);
 294 }
 295
 296 /*
 297  * Not really an io thread, all it does is burn CPU cycles in the specified
 298  * manner.
 299  */
 300 static void do_cpuio(struct thread_data *td)
 301 {
 302         struct timeval e;
 303         int split = 100 / td->cpuload;
 304         int i = 0;
 305
 306         while (!td->terminate) {
 307                 gettimeofday(&e, NULL);
 308
 309                 if (runtime_exceeded(td, &e))
 310                         break;
 311
 312                 if (!(i % split))
 313                         __usec_sleep(10000);
 314                 else
 315                         usec_sleep(td, 10000);
 316
 317                 i++;
 318         }
 319 }
 320
 321 /*
 322  * Main IO worker function. It retrieves io_u's to process and queues
 323  * and reaps them, checking for rate and errors along the way.
 324  */
 325 static void do_io(struct thread_data *td)
 326 {
 327         struct io_completion_data icd;
 328         struct timeval s, e;
 329         unsigned long usec;
 330         struct fio_file *f;
 331         int i, ret = 0;
 332
 333         td_set_runstate(td, TD_RUNNING);
 334
 335         while (td->this_io_bytes[td->ddir] < td->io_size) {
 336                 struct timespec ts = { .tv_sec = 0, .tv_nsec = 0};
 337                 struct timespec *timeout;
 338                 int min_evts = 0;
 339                 struct io_u *io_u;
 340
 341                 if (td->terminate)
 342                         break;
 343
 344                 f = get_next_file(td);
 345                 if (!f)
 346                         break;
 347
 348                 io_u = get_io_u(td, f);
 349                 if (!io_u)
 350                         break;
 351
 352                 memcpy(&s, &io_u->start_time, sizeof(s));
 353
 354                 ret = td_io_queue(td, io_u);
 355                 if (ret) {
 356                         put_io_u(td, io_u);
 357                         td_verror(td, ret);
 358                         break;
 359                 }
 360
 361                 add_slat_sample(td, io_u->ddir, mtime_since(&io_u->start_time, &io_u->issue_time));
 362
 363                 if (td->cur_depth < td->iodepth) {
 364                         timeout = &ts;
 365                         min_evts = 0;
 366                 } else {
 367                         timeout = NULL;
 368                         min_evts = 1;
 369                 }
 370
 371                 ret = td_io_getevents(td, min_evts, td->cur_depth, timeout);
 372                 if (ret < 0) {
 373                         td_verror(td, ret);
 374                         break;
 375                 } else if (!ret)
 376                         continue;
 377
 378                 icd.nr = ret;
 379                 ios_completed(td, &icd);
 380                 if (icd.error) {
 381                         td_verror(td, icd.error);
 382                         break;
 383                 }
 384
 385                 /*
 386                  * the rate is batched for now, it should work for batches
 387                  * of completions except the very first one which may look
 388                  * a little bursty
 389                  */
 390                 gettimeofday(&e, NULL);
 391                 usec = utime_since(&s, &e);
 392
 393                 rate_throttle(td, usec, icd.bytes_done[td->ddir]);
 394
 395                 if (check_min_rate(td, &e)) {
 396                         if (rate_quit)
 397                                 terminate_threads(td->groupid);
 398                         td_verror(td, ENOMEM);
 399                         break;
 400                 }
 401
 402                 if (runtime_exceeded(td, &e))
 403                         break;
 404
 405                 if (td->thinktime)
 406                         usec_sleep(td, td->thinktime);
 407         }
 408
 409         if (!ret) {
 410                 if (td->cur_depth)
 411                         cleanup_pending_aio(td);
 412
 413                 if (should_fsync(td) && td->end_fsync) {
 414                         td_set_runstate(td, TD_FSYNCING);
 415                         for_each_file(td, f, i)
 416                                 td_io_sync(td, f);
 417                 }
 418         }
 419 }
 420
 421 static void cleanup_io_u(struct thread_data *td)
 422 {
 423         struct list_head *entry, *n;
 424         struct io_u *io_u;
 425
 426         list_for_each_safe(entry, n, &td->io_u_freelist) {
 427                 io_u = list_entry(entry, struct io_u, list);
 428
 429                 list_del(&io_u->list);
 430                 free(io_u);
 431         }
 432
 433         free_io_mem(td);
 434 }
 435
 436 static int init_io_u(struct thread_data *td)
 437 {
 438         struct io_u *io_u;
 439         int i, max_units;
 440         char *p;
 441
 442         if (td->io_ops->flags & FIO_CPUIO)
 443                 return 0;
 444
 445         if (td->io_ops->flags & FIO_SYNCIO)
 446                 max_units = 1;
 447         else
 448                 max_units = td->iodepth;
 449
 450         td->orig_buffer_size = td->max_bs * max_units + MASK;
 451
 452         if (allocate_io_mem(td))
 453                 return 1;
 454
 455         p = ALIGN(td->orig_buffer);
 456         for (i = 0; i < max_units; i++) {
 457                 io_u = malloc(sizeof(*io_u));
 458                 memset(io_u, 0, sizeof(*io_u));
 459                 INIT_LIST_HEAD(&io_u->list);
 460
 461                 io_u->buf = p + td->max_bs * i;
 462                 io_u->index = i;
 463                 list_add(&io_u->list, &td->io_u_freelist);
 464         }
 465
 466         return 0;
 467 }
 468
 469 static int switch_ioscheduler(struct thread_data *td)
 470 {
 471         char tmp[256], tmp2[128];
 472         FILE *f;
 473         int ret;
 474
 475         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
 476
 477         f = fopen(tmp, "r+");
 478         if (!f) {
 479                 td_verror(td, errno);
 480                 return 1;
 481         }
 482
 483         /*
 484          * Set io scheduler.
 485          */
 486         ret = fwrite(td->ioscheduler, strlen(td->ioscheduler), 1, f);
 487         if (ferror(f) || ret != 1) {
 488                 td_verror(td, errno);
 489                 fclose(f);
 490                 return 1;
 491         }
 492
 493         rewind(f);
 494
 495         /*
 496          * Read back and check that the selected scheduler is now the default.
 497          */
 498         ret = fread(tmp, 1, sizeof(tmp), f);
 499         if (ferror(f) || ret < 0) {
 500                 td_verror(td, errno);
 501                 fclose(f);
 502                 return 1;
 503         }
 504
 505         sprintf(tmp2, "[%s]", td->ioscheduler);
 506         if (!strstr(tmp, tmp2)) {
 507                 log_err("fio: io scheduler %s not found\n", td->ioscheduler);
 508                 td_verror(td, EINVAL);
 509                 fclose(f);
 510                 return 1;
 511         }
 512
 513         fclose(f);
 514         return 0;
 515 }
 516
 517 static void clear_io_state(struct thread_data *td)
 518 {
 519         struct fio_file *f;
 520         int i;
 521
 522         td->stat_io_bytes[0] = td->stat_io_bytes[1] = 0;
 523         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
 524         td->zone_bytes = 0;
 525
 526         for_each_file(td, f, i) {
 527                 f->last_pos = 0;
 528                 if (td->io_ops->flags & FIO_SYNCIO)
 529                         lseek(f->fd, SEEK_SET, 0);
 530
 531                 if (f->file_map)
 532                         memset(f->file_map, 0, f->num_maps * sizeof(long));
 533         }
 534 }
 535
 536 /*
 537  * Entry point for the thread based jobs. The process based jobs end up
 538  * here as well, after a little setup.
 539  */
 540 static void *thread_main(void *data)
 541 {
 542         struct thread_data *td = data;
 543
 544         if (!td->use_thread)
 545                 setsid();
 546
 547         td->pid = getpid();
 548
 549         INIT_LIST_HEAD(&td->io_u_freelist);
 550         INIT_LIST_HEAD(&td->io_u_busylist);
 551         INIT_LIST_HEAD(&td->io_hist_list);
 552         INIT_LIST_HEAD(&td->io_log_list);
 553
 554         if (init_io_u(td))
 555                 goto err;
 556
 557         if (fio_setaffinity(td) == -1) {
 558                 td_verror(td, errno);
 559                 goto err;
 560         }
 561
 562         if (td_io_init(td))
 563                 goto err;
 564
 565         if (init_iolog(td))
 566                 goto err;
 567
 568         if (td->ioprio) {
 569                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
 570                         td_verror(td, errno);
 571                         goto err;
 572                 }
 573         }
 574
 575         if (nice(td->nice) == -1) {
 576                 td_verror(td, errno);
 577                 goto err;
 578         }
 579
 580         if (init_random_state(td))
 581                 goto err;
 582
 583         if (td->ioscheduler && switch_ioscheduler(td))
 584                 goto err;
 585
 586         td_set_runstate(td, TD_INITIALIZED);
 587         fio_sem_up(&startup_sem);
 588         fio_sem_down(&td->mutex);
 589
 590         if (!td->create_serialize && setup_files(td))
 591                 goto err;
 592
 593         gettimeofday(&td->epoch, NULL);
 594
 595         if (td->exec_prerun)
 596                 system(td->exec_prerun);
 597
 598         while (td->loops--) {
 599                 getrusage(RUSAGE_SELF, &td->ru_start);
 600                 gettimeofday(&td->start, NULL);
 601                 memcpy(&td->stat_sample_time, &td->start, sizeof(td->start));
 602
 603                 if (td->ratemin)
 604                         memcpy(&td->lastrate, &td->stat_sample_time, sizeof(td->lastrate));
 605
 606                 clear_io_state(td);
 607                 prune_io_piece_log(td);
 608
 609                 if (td->io_ops->flags & FIO_CPUIO)
 610                         do_cpuio(td);
 611                 else
 612                         do_io(td);
 613
 614                 td->runtime[td->ddir] += mtime_since_now(&td->start);
 615                 if (td_rw(td) && td->io_bytes[td->ddir ^ 1])
 616                         td->runtime[td->ddir ^ 1] = td->runtime[td->ddir];
 617
 618                 update_rusage_stat(td);
 619
 620                 if (td->error || td->terminate)
 621                         break;
 622
 623                 if (td->verify == VERIFY_NONE)
 624                         continue;
 625
 626                 clear_io_state(td);
 627                 gettimeofday(&td->start, NULL);
 628
 629                 do_verify(td);
 630
 631                 td->runtime[DDIR_READ] += mtime_since_now(&td->start);
 632
 633                 if (td->error || td->terminate)
 634                         break;
 635         }
 636
 637         if (td->bw_log)
 638                 finish_log(td, td->bw_log, "bw");
 639         if (td->slat_log)
 640                 finish_log(td, td->slat_log, "slat");
 641         if (td->clat_log)
 642                 finish_log(td, td->clat_log, "clat");
 643         if (td->write_iolog)
 644                 write_iolog_close(td);
 645         if (td->exec_postrun)
 646                 system(td->exec_postrun);
 647
 648         if (exitall_on_terminate)
 649                 terminate_threads(td->groupid);
 650
 651 err:
 652         close_files(td);
 653         close_ioengine(td);
 654         cleanup_io_u(td);
 655         td_set_runstate(td, TD_EXITED);
 656         return NULL;
 657
 658 }
 659
 660 /*
 661  * We cannot pass the td data into a forked process, so attach the td and
 662  * pass it to the thread worker.
 663  */
 664 static void *fork_main(int shmid, int offset)
 665 {
 666         struct thread_data *td;
 667         void *data;
 668
 669         data = shmat(shmid, NULL, 0);
 670         if (data == (void *) -1) {
 671                 perror("shmat");
 672                 return NULL;
 673         }
 674
 675         td = data + offset * sizeof(struct thread_data);
 676         thread_main(td);
 677         shmdt(data);
 678         return NULL;
 679 }
 680
 681 /*
 682  * Run over the job map and reap the threads that have exited, if any.
 683  */
 684 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
 685 {
 686         struct thread_data *td;
 687         int i, cputhreads;
 688
 689         /*
 690          * reap exited threads (TD_EXITED -> TD_REAPED)
 691          */
 692         cputhreads = 0;
 693         for_each_td(td, i) {
 694                 /*
 695                  * ->io_ops is NULL for a thread that has closed its
 696                  * io engine
 697                  */
 698                 if (td->io_ops && td->io_ops->flags & FIO_CPUIO)
 699                         cputhreads++;
 700
 701                 if (td->runstate != TD_EXITED)
 702                         continue;
 703
 704                 td_set_runstate(td, TD_REAPED);
 705
 706                 if (td->use_thread) {
 707                         long ret;
 708
 709                         if (pthread_join(td->thread, (void *) &ret))
 710                                 perror("thread_join");
 711                 } else
 712                         waitpid(td->pid, NULL, 0);
 713
 714                 (*nr_running)--;
 715                 (*m_rate) -= td->ratemin;
 716                 (*t_rate) -= td->rate;
 717         }
 718
 719         if (*nr_running == cputhreads)
 720                 terminate_threads(TERMINATE_ALL);
 721 }
 722
 723 /*
 724  * Main function for kicking off and reaping jobs, as needed.
 725  */
 726 static void run_threads(void)
 727 {
 728         struct thread_data *td;
 729         unsigned long spent;
 730         int i, todo, nr_running, m_rate, t_rate, nr_started;
 731
 732         if (fio_pin_memory())
 733                 return;
 734
 735         if (!terse_output) {
 736                 printf("Starting %d thread%s\n", thread_number, thread_number > 1 ? "s" : "");
 737                 fflush(stdout);
 738         }
 739
 740         signal(SIGINT, sig_handler);
 741         signal(SIGALRM, sig_handler);
 742
 743         todo = thread_number;
 744         nr_running = 0;
 745         nr_started = 0;
 746         m_rate = t_rate = 0;
 747
 748         for_each_td(td, i) {
 749                 print_status_init(td->thread_number - 1);
 750
 751                 init_disk_util(td);
 752
 753                 if (!td->create_serialize)
 754                         continue;
 755
 756                 /*
 757                  * do file setup here so it happens sequentially,
 758                  * we don't want X number of threads getting their
 759                  * client data interspersed on disk
 760                  */
 761                 if (setup_files(td)) {
 762                         td_set_runstate(td, TD_REAPED);
 763                         todo--;
 764                 }
 765         }
 766
 767         time_init();
 768
 769         while (todo) {
 770                 struct thread_data *map[MAX_JOBS];
 771                 struct timeval this_start;
 772                 int this_jobs = 0, left;
 773
 774                 /*
 775                  * create threads (TD_NOT_CREATED -> TD_CREATED)
 776                  */
 777                 for_each_td(td, i) {
 778                         if (td->runstate != TD_NOT_CREATED)
 779                                 continue;
 780
 781                         /*
 782                          * never got a chance to start, killed by other
 783                          * thread for some reason
 784                          */
 785                         if (td->terminate) {
 786                                 todo--;
 787                                 continue;
 788                         }
 789
 790                         if (td->start_delay) {
 791                                 spent = mtime_since_genesis();
 792
 793                                 if (td->start_delay * 1000 > spent)
 794                                         continue;
 795                         }
 796
 797                         if (td->stonewall && (nr_started || nr_running))
 798                                 break;
 799
 800                         /*
 801                          * Set state to created. Thread will transition
 802                          * to TD_INITIALIZED when it's done setting up.
 803                          */
 804                         td_set_runstate(td, TD_CREATED);
 805                         map[this_jobs++] = td;
 806                         fio_sem_init(&startup_sem, 1);
 807                         nr_started++;
 808
 809                         if (td->use_thread) {
 810                                 if (pthread_create(&td->thread, NULL, thread_main, td)) {
 811                                         perror("thread_create");
 812                                         nr_started--;
 813                                 }
 814                         } else {
 815                                 if (fork())
 816                                         fio_sem_down(&startup_sem);
 817                                 else {
 818                                         fork_main(shm_id, i);
 819                                         exit(0);
 820                                 }
 821                         }
 822                 }
 823
 824                 /*
 825                  * Wait for the started threads to transition to
 826                  * TD_INITIALIZED.
 827                  */
 828                 gettimeofday(&this_start, NULL);
 829                 left = this_jobs;
 830                 while (left) {
 831                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
 832                                 break;
 833
 834                         usleep(100000);
 835
 836                         for (i = 0; i < this_jobs; i++) {
 837                                 td = map[i];
 838                                 if (!td)
 839                                         continue;
 840                                 if (td->runstate == TD_INITIALIZED) {
 841                                         map[i] = NULL;
 842                                         left--;
 843                                 } else if (td->runstate >= TD_EXITED) {
 844                                         map[i] = NULL;
 845                                         left--;
 846                                         todo--;
 847                                         nr_running++; /* work-around... */
 848                                 }
 849                         }
 850                 }
 851
 852                 if (left) {
 853                         log_err("fio: %d jobs failed to start\n", left);
 854                         for (i = 0; i < this_jobs; i++) {
 855                                 td = map[i];
 856                                 if (!td)
 857                                         continue;
 858                                 kill(td->pid, SIGTERM);
 859                         }
 860                         break;
 861                 }
 862
 863                 /*
 864                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
 865                  */
 866                 for_each_td(td, i) {
 867                         if (td->runstate != TD_INITIALIZED)
 868                                 continue;
 869
 870                         td_set_runstate(td, TD_RUNNING);
 871                         nr_running++;
 872                         nr_started--;
 873                         m_rate += td->ratemin;
 874                         t_rate += td->rate;
 875                         todo--;
 876                         fio_sem_up(&td->mutex);
 877                 }
 878
 879                 reap_threads(&nr_running, &t_rate, &m_rate);
 880
 881                 if (todo)
 882                         usleep(100000);
 883         }
 884
 885         while (nr_running) {
 886                 reap_threads(&nr_running, &t_rate, &m_rate);
 887                 usleep(10000);
 888         }
 889
 890         update_io_ticks();
 891         fio_unpin_memory();
 892 }
 893
 894 int main(int argc, char *argv[])
 895 {
 896         if (parse_options(argc, argv))
 897                 return 1;
 898
 899         if (!thread_number) {
 900                 log_err("Nothing to do\n");
 901                 return 1;
 902         }
 903
 904         disk_util_timer_arm();
 905
 906         run_threads();
 907         show_run_stats();
 908
 909         return 0;
 910 }