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  * The license below covers all files distributed with fio unless otherwise
   8  * noted in the file itself.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <string.h>
  27 #include <signal.h>
  28 #include <time.h>
  29 #include <locale.h>
  30 #include <assert.h>
  31 #include <sys/stat.h>
  32 #include <sys/wait.h>
  33 #include <sys/ipc.h>
  34 #include <sys/shm.h>
  35 #include <sys/mman.h>
  36
  37 #include "fio.h"
  38 #include "os.h"
  39
  40 static unsigned long page_mask;
  41 #define ALIGN(buf)      \
  42         (char *) (((unsigned long) (buf) + page_mask) & ~page_mask)
  43
  44 int groupid = 0;
  45 int thread_number = 0;
  46 int shm_id = 0;
  47 int temp_stall_ts;
  48
  49 static volatile int startup_sem;
  50 static volatile int fio_abort;
  51 static int exit_value;
  52
  53 struct io_log *agg_io_log[2];
  54
  55 #define TERMINATE_ALL           (-1)
  56 #define JOB_START_TIMEOUT       (5 * 1000)
  57
  58 static inline void td_set_runstate(struct thread_data *td, int runstate)
  59 {
  60         td->runstate = runstate;
  61 }
  62
  63 static void terminate_threads(int group_id, int forced_kill)
  64 {
  65         struct thread_data *td;
  66         int i;
  67
  68         for_each_td(td, i) {
  69                 if (group_id == TERMINATE_ALL || groupid == td->groupid) {
  70                         td->terminate = 1;
  71                         td->start_delay = 0;
  72                         if (forced_kill)
  73                                 td_set_runstate(td, TD_EXITED);
  74                 }
  75         }
  76 }
  77
  78 static void sig_handler(int sig)
  79 {
  80         switch (sig) {
  81                 case SIGALRM:
  82                         update_io_ticks();
  83                         disk_util_timer_arm();
  84                         print_thread_status();
  85                         break;
  86                 default:
  87                         printf("\nfio: terminating on signal %d\n", sig);
  88                         fflush(stdout);
  89                         terminate_threads(TERMINATE_ALL, 0);
  90                         break;
  91         }
  92 }
  93
  94 /*
  95  * Check if we are above the minimum rate given.
  96  */
  97 static int check_min_rate(struct thread_data *td, struct timeval *now)
  98 {
  99         unsigned long long bytes = 0;
 100         unsigned long spent;
 101         unsigned long rate;
 102
 103         /*
 104          * allow a 2 second settle period in the beginning
 105          */
 106         if (mtime_since(&td->start, now) < 2000)
 107                 return 0;
 108
 109         if (td_read(td))
 110                 bytes += td->this_io_bytes[DDIR_READ];
 111         if (td_write(td))
 112                 bytes += td->this_io_bytes[DDIR_WRITE];
 113
 114         /*
 115          * if rate blocks is set, sample is running
 116          */
 117         if (td->rate_bytes) {
 118                 spent = mtime_since(&td->lastrate, now);
 119                 if (spent < td->ratecycle)
 120                         return 0;
 121
 122                 if (bytes < td->rate_bytes) {
 123                         fprintf(f_out, "%s: min rate %u not met\n", td->name, td->ratemin);
 124                         return 1;
 125                 } else {
 126                         rate = (bytes - td->rate_bytes) / spent;
 127                         if (rate < td->ratemin || bytes < td->rate_bytes) {
 128                                 fprintf(f_out, "%s: min rate %u not met, got %luKiB/sec\n", td->name, td->ratemin, rate);
 129                                 return 1;
 130                         }
 131                 }
 132         }
 133
 134         td->rate_bytes = bytes;
 135         memcpy(&td->lastrate, now, sizeof(*now));
 136         return 0;
 137 }
 138
 139 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
 140 {
 141         if (!td->timeout)
 142                 return 0;
 143         if (mtime_since(&td->epoch, t) >= td->timeout * 1000)
 144                 return 1;
 145
 146         return 0;
 147 }
 148
 149 /*
 150  * When job exits, we can cancel the in-flight IO if we are using async
 151  * io. Attempt to do so.
 152  */
 153 static void cleanup_pending_aio(struct thread_data *td)
 154 {
 155         struct list_head *entry, *n;
 156         struct io_u *io_u;
 157         int r;
 158
 159         /*
 160          * get immediately available events, if any
 161          */
 162         r = io_u_queued_complete(td, 0);
 163         if (r < 0)
 164                 return;
 165
 166         /*
 167          * now cancel remaining active events
 168          */
 169         if (td->io_ops->cancel) {
 170                 list_for_each_safe(entry, n, &td->io_u_busylist) {
 171                         io_u = list_entry(entry, struct io_u, list);
 172
 173                         /*
 174                          * if the io_u isn't in flight, then that generally
 175                          * means someone leaked an io_u. complain but fix
 176                          * it up, so we don't stall here.
 177                          */
 178                         if ((io_u->flags & IO_U_F_FLIGHT) == 0) {
 179                                 log_err("fio: non-busy IO on busy list\n");
 180                                 put_io_u(td, io_u);
 181                         } else {
 182                                 r = td->io_ops->cancel(td, io_u);
 183                                 if (!r)
 184                                         put_io_u(td, io_u);
 185                         }
 186                 }
 187         }
 188
 189         if (td->cur_depth)
 190                 r = io_u_queued_complete(td, td->cur_depth);
 191 }
 192
 193 /*
 194  * Helper to handle the final sync of a file. Works just like the normal
 195  * io path, just does everything sync.
 196  */
 197 static int fio_io_sync(struct thread_data *td, struct fio_file *f)
 198 {
 199         struct io_u *io_u = __get_io_u(td);
 200         int ret;
 201
 202         if (!io_u)
 203                 return 1;
 204
 205         io_u->ddir = DDIR_SYNC;
 206         io_u->file = f;
 207
 208         if (td_io_prep(td, io_u)) {
 209                 put_io_u(td, io_u);
 210                 return 1;
 211         }
 212
 213 requeue:
 214         ret = td_io_queue(td, io_u);
 215         if (ret < 0) {
 216                 td_verror(td, io_u->error, "td_io_queue");
 217                 put_io_u(td, io_u);
 218                 return 1;
 219         } else if (ret == FIO_Q_QUEUED) {
 220                 if (io_u_queued_complete(td, 1) < 0)
 221                         return 1;
 222         } else if (ret == FIO_Q_COMPLETED) {
 223                 if (io_u->error) {
 224                         td_verror(td, io_u->error, "td_io_queue");
 225                         return 1;
 226                 }
 227
 228                 if (io_u_sync_complete(td, io_u) < 0)
 229                         return 1;
 230         } else if (ret == FIO_Q_BUSY) {
 231                 if (td_io_commit(td))
 232                         return 1;
 233                 goto requeue;
 234         }
 235
 236         return 0;
 237 }
 238
 239 /*
 240  * The main verify engine. Runs over the writes we previusly submitted,
 241  * reads the blocks back in, and checks the crc/md5 of the data.
 242  */
 243 static void do_verify(struct thread_data *td)
 244 {
 245         struct fio_file *f;
 246         struct io_u *io_u;
 247         int ret, i, min_events;
 248
 249         /*
 250          * sync io first and invalidate cache, to make sure we really
 251          * read from disk.
 252          */
 253         for_each_file(td, f, i) {
 254                 if (fio_io_sync(td, f))
 255                         break;
 256                 if (file_invalidate_cache(td, f))
 257                         break;
 258         }
 259
 260         if (td->error)
 261                 return;
 262
 263         td_set_runstate(td, TD_VERIFYING);
 264
 265         io_u = NULL;
 266         while (!td->terminate) {
 267                 io_u = __get_io_u(td);
 268                 if (!io_u)
 269                         break;
 270
 271                 if (runtime_exceeded(td, &io_u->start_time)) {
 272                         put_io_u(td, io_u);
 273                         break;
 274                 }
 275
 276                 if (get_next_verify(td, io_u)) {
 277                         put_io_u(td, io_u);
 278                         break;
 279                 }
 280
 281                 if (td_io_prep(td, io_u)) {
 282                         put_io_u(td, io_u);
 283                         break;
 284                 }
 285
 286                 io_u->end_io = verify_io_u;
 287 requeue:
 288                 ret = td_io_queue(td, io_u);
 289
 290                 switch (ret) {
 291                 case FIO_Q_COMPLETED:
 292                         if (io_u->error)
 293                                 ret = -io_u->error;
 294                         if (io_u->xfer_buflen != io_u->resid && io_u->resid) {
 295                                 int bytes = io_u->xfer_buflen - io_u->resid;
 296
 297                                 io_u->xfer_buflen = io_u->resid;
 298                                 io_u->xfer_buf += bytes;
 299                                 goto requeue;
 300                         }
 301                         ret = io_u_sync_complete(td, io_u);
 302                         if (ret < 0)
 303                                 break;
 304                         continue;
 305                 case FIO_Q_QUEUED:
 306                         break;
 307                 case FIO_Q_BUSY:
 308                         requeue_io_u(td, &io_u);
 309                         ret = td_io_commit(td);
 310                         break;
 311                 default:
 312                         assert(ret < 0);
 313                         td_verror(td, -ret, "td_io_queue");
 314                         break;
 315                 }
 316
 317                 if (ret < 0 || td->error)
 318                         break;
 319
 320                 /*
 321                  * if we can queue more, do so. but check if there are
 322                  * completed io_u's first.
 323                  */
 324                 min_events = 0;
 325                 if (queue_full(td) || ret == FIO_Q_BUSY) {
 326                         min_events = 1;
 327
 328                         if (td->cur_depth > td->iodepth_low)
 329                                 min_events = td->cur_depth - td->iodepth_low;
 330                 }
 331
 332                 /*
 333                  * Reap required number of io units, if any, and do the
 334                  * verification on them through the callback handler
 335                  */
 336                 if (io_u_queued_complete(td, min_events) < 0)
 337                         break;
 338         }
 339
 340         if (!td->error) {
 341                 min_events = td->cur_depth;
 342
 343                 if (min_events)
 344                         ret = io_u_queued_complete(td, min_events);
 345         } else
 346                 cleanup_pending_aio(td);
 347
 348         td_set_runstate(td, TD_RUNNING);
 349 }
 350
 351 /*
 352  * Not really an io thread, all it does is burn CPU cycles in the specified
 353  * manner.
 354  */
 355 static void do_cpuio(struct thread_data *td)
 356 {
 357         struct timeval e;
 358         int split = 100 / td->cpuload;
 359         int i = 0;
 360
 361         while (!td->terminate) {
 362                 fio_gettime(&e, NULL);
 363
 364                 if (runtime_exceeded(td, &e))
 365                         break;
 366
 367                 if (!(i % split))
 368                         __usec_sleep(10000);
 369                 else
 370                         usec_sleep(td, 10000);
 371
 372                 i++;
 373         }
 374 }
 375
 376 /*
 377  * Main IO worker function. It retrieves io_u's to process and queues
 378  * and reaps them, checking for rate and errors along the way.
 379  */
 380 static void do_io(struct thread_data *td)
 381 {
 382         struct timeval s;
 383         unsigned long usec;
 384         int i, ret = 0;
 385
 386         td_set_runstate(td, TD_RUNNING);
 387
 388         while ((td->this_io_bytes[0] + td->this_io_bytes[1]) < td->io_size) {
 389                 struct timeval comp_time;
 390                 long bytes_done = 0;
 391                 int min_evts = 0;
 392                 struct io_u *io_u;
 393
 394                 if (td->terminate)
 395                         break;
 396
 397                 io_u = get_io_u(td);
 398                 if (!io_u)
 399                         break;
 400
 401                 memcpy(&s, &io_u->start_time, sizeof(s));
 402
 403                 if (runtime_exceeded(td, &s)) {
 404                         put_io_u(td, io_u);
 405                         break;
 406                 }
 407 requeue:
 408                 ret = td_io_queue(td, io_u);
 409
 410                 switch (ret) {
 411                 case FIO_Q_COMPLETED:
 412                         if (io_u->error) {
 413                                 ret = io_u->error;
 414                                 break;
 415                         }
 416                         if (io_u->xfer_buflen != io_u->resid && io_u->resid) {
 417                                 int bytes = io_u->xfer_buflen - io_u->resid;
 418
 419                                 io_u->xfer_buflen = io_u->resid;
 420                                 io_u->xfer_buf += bytes;
 421                                 goto requeue;
 422                         }
 423                         fio_gettime(&comp_time, NULL);
 424                         bytes_done = io_u_sync_complete(td, io_u);
 425                         if (bytes_done < 0)
 426                                 ret = bytes_done;
 427                         break;
 428                 case FIO_Q_QUEUED:
 429                         /*
 430                          * if the engine doesn't have a commit hook,
 431                          * the io_u is really queued. if it does have such
 432                          * a hook, it has to call io_u_queued() itself.
 433                          */
 434                         if (td->io_ops->commit == NULL)
 435                                 io_u_queued(td, io_u);
 436                         break;
 437                 case FIO_Q_BUSY:
 438                         requeue_io_u(td, &io_u);
 439                         ret = td_io_commit(td);
 440                         break;
 441                 default:
 442                         assert(ret < 0);
 443                         put_io_u(td, io_u);
 444                         break;
 445                 }
 446
 447                 if (ret < 0 || td->error)
 448                         break;
 449
 450                 /*
 451                  * See if we need to complete some commands
 452                  */
 453                 if (ret == FIO_Q_QUEUED || ret == FIO_Q_BUSY) {
 454                         min_evts = 0;
 455                         if (queue_full(td) || ret == FIO_Q_BUSY) {
 456                                 min_evts = 1;
 457
 458                                 if (td->cur_depth > td->iodepth_low)
 459                                         min_evts = td->cur_depth - td->iodepth_low;
 460                         }
 461
 462                         fio_gettime(&comp_time, NULL);
 463                         bytes_done = io_u_queued_complete(td, min_evts);
 464                         if (bytes_done < 0)
 465                                 break;
 466                 }
 467
 468                 if (!bytes_done)
 469                         continue;
 470
 471                 /*
 472                  * the rate is batched for now, it should work for batches
 473                  * of completions except the very first one which may look
 474                  * a little bursty
 475                  */
 476                 usec = utime_since(&s, &comp_time);
 477
 478                 rate_throttle(td, usec, bytes_done);
 479
 480                 if (check_min_rate(td, &comp_time)) {
 481                         if (exitall_on_terminate)
 482                                 terminate_threads(td->groupid, 0);
 483                         td_verror(td, ENODATA, "check_min_rate");
 484                         break;
 485                 }
 486
 487                 if (td->thinktime) {
 488                         unsigned long long b;
 489
 490                         b = td->io_blocks[0] + td->io_blocks[1];
 491                         if (!(b % td->thinktime_blocks)) {
 492                                 int left;
 493
 494                                 if (td->thinktime_spin)
 495                                         __usec_sleep(td->thinktime_spin);
 496
 497                                 left = td->thinktime - td->thinktime_spin;
 498                                 if (left)
 499                                         usec_sleep(td, left);
 500                         }
 501                 }
 502         }
 503
 504         if (!td->error) {
 505                 struct fio_file *f;
 506
 507                 i = td->cur_depth;
 508                 if (i)
 509                         ret = io_u_queued_complete(td, i);
 510
 511                 if (should_fsync(td) && td->end_fsync) {
 512                         td_set_runstate(td, TD_FSYNCING);
 513                         for_each_file(td, f, i)
 514                                 fio_io_sync(td, f);
 515                 }
 516         } else
 517                 cleanup_pending_aio(td);
 518 }
 519
 520 static void cleanup_io_u(struct thread_data *td)
 521 {
 522         struct list_head *entry, *n;
 523         struct io_u *io_u;
 524
 525         list_for_each_safe(entry, n, &td->io_u_freelist) {
 526                 io_u = list_entry(entry, struct io_u, list);
 527
 528                 list_del(&io_u->list);
 529                 free(io_u);
 530         }
 531
 532         free_io_mem(td);
 533 }
 534
 535 /*
 536  * "randomly" fill the buffer contents
 537  */
 538 static void fill_rand_buf(struct io_u *io_u, int max_bs)
 539 {
 540         int *ptr = io_u->buf;
 541
 542         while ((void *) ptr - io_u->buf < max_bs) {
 543                 *ptr = rand() * 0x9e370001;
 544                 ptr++;
 545         }
 546 }
 547
 548 static int init_io_u(struct thread_data *td)
 549 {
 550         struct io_u *io_u;
 551         unsigned int max_bs;
 552         int i, max_units;
 553         char *p;
 554
 555         if (td->io_ops->flags & FIO_CPUIO)
 556                 return 0;
 557
 558         if (td->io_ops->flags & FIO_SYNCIO)
 559                 max_units = 1;
 560         else
 561                 max_units = td->iodepth;
 562
 563         max_bs = max(td->max_bs[DDIR_READ], td->max_bs[DDIR_WRITE]);
 564         td->orig_buffer_size = max_bs * max_units;
 565
 566         if (td->mem_type == MEM_SHMHUGE || td->mem_type == MEM_MMAPHUGE)
 567                 td->orig_buffer_size = (td->orig_buffer_size + td->hugepage_size - 1) & ~(td->hugepage_size - 1);
 568         else
 569                 td->orig_buffer_size += page_mask;
 570
 571         if (allocate_io_mem(td))
 572                 return 1;
 573
 574         p = ALIGN(td->orig_buffer);
 575         for (i = 0; i < max_units; i++) {
 576                 io_u = malloc(sizeof(*io_u));
 577                 memset(io_u, 0, sizeof(*io_u));
 578                 INIT_LIST_HEAD(&io_u->list);
 579
 580                 io_u->buf = p + max_bs * i;
 581                 if (td_write(td) || td_rw(td))
 582                         fill_rand_buf(io_u, max_bs);
 583
 584                 io_u->index = i;
 585                 io_u->flags = IO_U_F_FREE;
 586                 list_add(&io_u->list, &td->io_u_freelist);
 587         }
 588
 589         io_u_init_timeout();
 590
 591         return 0;
 592 }
 593
 594 static int switch_ioscheduler(struct thread_data *td)
 595 {
 596         char tmp[256], tmp2[128];
 597         FILE *f;
 598         int ret;
 599
 600         if (td->io_ops->flags & FIO_CPUIO)
 601                 return 0;
 602
 603         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
 604
 605         f = fopen(tmp, "r+");
 606         if (!f) {
 607                 td_verror(td, errno, "fopen");
 608                 return 1;
 609         }
 610
 611         /*
 612          * Set io scheduler.
 613          */
 614         ret = fwrite(td->ioscheduler, strlen(td->ioscheduler), 1, f);
 615         if (ferror(f) || ret != 1) {
 616                 td_verror(td, errno, "fwrite");
 617                 fclose(f);
 618                 return 1;
 619         }
 620
 621         rewind(f);
 622
 623         /*
 624          * Read back and check that the selected scheduler is now the default.
 625          */
 626         ret = fread(tmp, 1, sizeof(tmp), f);
 627         if (ferror(f) || ret < 0) {
 628                 td_verror(td, errno, "fread");
 629                 fclose(f);
 630                 return 1;
 631         }
 632
 633         sprintf(tmp2, "[%s]", td->ioscheduler);
 634         if (!strstr(tmp, tmp2)) {
 635                 log_err("fio: io scheduler %s not found\n", td->ioscheduler);
 636                 td_verror(td, EINVAL, "iosched_switch");
 637                 fclose(f);
 638                 return 1;
 639         }
 640
 641         fclose(f);
 642         return 0;
 643 }
 644
 645 static void clear_io_state(struct thread_data *td)
 646 {
 647         struct fio_file *f;
 648         int i;
 649
 650         td->ts.stat_io_bytes[0] = td->ts.stat_io_bytes[1] = 0;
 651         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
 652         td->zone_bytes = 0;
 653
 654         td->last_was_sync = 0;
 655
 656         for_each_file(td, f, i) {
 657                 f->last_completed_pos = 0;
 658
 659                 f->last_pos = 0;
 660                 if (td->io_ops->flags & FIO_SYNCIO)
 661                         lseek(f->fd, SEEK_SET, 0);
 662
 663                 if (f->file_map)
 664                         memset(f->file_map, 0, f->num_maps * sizeof(long));
 665         }
 666 }
 667
 668 /*
 669  * Entry point for the thread based jobs. The process based jobs end up
 670  * here as well, after a little setup.
 671  */
 672 static void *thread_main(void *data)
 673 {
 674         unsigned long long runtime[2];
 675         struct thread_data *td = data;
 676
 677         if (!td->use_thread)
 678                 setsid();
 679
 680         td->pid = getpid();
 681
 682         INIT_LIST_HEAD(&td->io_u_freelist);
 683         INIT_LIST_HEAD(&td->io_u_busylist);
 684         INIT_LIST_HEAD(&td->io_u_requeues);
 685         INIT_LIST_HEAD(&td->io_hist_list);
 686         INIT_LIST_HEAD(&td->io_log_list);
 687
 688         if (init_io_u(td))
 689                 goto err;
 690
 691         if (fio_setaffinity(td) == -1) {
 692                 td_verror(td, errno, "cpu_set_affinity");
 693                 goto err;
 694         }
 695
 696         if (init_iolog(td))
 697                 goto err;
 698
 699         if (td->ioprio) {
 700                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
 701                         td_verror(td, errno, "ioprio_set");
 702                         goto err;
 703                 }
 704         }
 705
 706         if (nice(td->nice) == -1) {
 707                 td_verror(td, errno, "nice");
 708                 goto err;
 709         }
 710
 711         if (init_random_state(td))
 712                 goto err;
 713
 714         if (td->ioscheduler && switch_ioscheduler(td))
 715                 goto err;
 716
 717         td_set_runstate(td, TD_INITIALIZED);
 718         fio_sem_up(&startup_sem);
 719         fio_sem_down(&td->mutex);
 720
 721         if (!td->create_serialize && setup_files(td))
 722                 goto err;
 723         if (open_files(td))
 724                 goto err;
 725
 726         /*
 727          * Do this late, as some IO engines would like to have the
 728          * files setup prior to initializing structures.
 729          */
 730         if (td_io_init(td))
 731                 goto err;
 732
 733         if (td->exec_prerun) {
 734                 if (system(td->exec_prerun) < 0)
 735                         goto err;
 736         }
 737
 738         fio_gettime(&td->epoch, NULL);
 739         memcpy(&td->timeout_end, &td->epoch, sizeof(td->epoch));
 740         getrusage(RUSAGE_SELF, &td->ts.ru_start);
 741
 742         runtime[0] = runtime[1] = 0;
 743         while (td->loops--) {
 744                 fio_gettime(&td->start, NULL);
 745                 memcpy(&td->ts.stat_sample_time, &td->start, sizeof(td->start));
 746
 747                 if (td->ratemin)
 748                         memcpy(&td->lastrate, &td->ts.stat_sample_time, sizeof(td->lastrate));
 749
 750                 clear_io_state(td);
 751                 prune_io_piece_log(td);
 752
 753                 if (td->io_ops->flags & FIO_CPUIO)
 754                         do_cpuio(td);
 755                 else
 756                         do_io(td);
 757
 758                 if (td_read(td) && td->io_bytes[DDIR_READ])
 759                         runtime[DDIR_READ] += utime_since_now(&td->start);
 760                 if (td_write(td) && td->io_bytes[DDIR_WRITE])
 761                         runtime[DDIR_WRITE] += utime_since_now(&td->start);
 762
 763                 if (td->error || td->terminate)
 764                         break;
 765
 766                 if (td->verify == VERIFY_NONE)
 767                         continue;
 768
 769                 clear_io_state(td);
 770                 fio_gettime(&td->start, NULL);
 771
 772                 do_verify(td);
 773
 774                 runtime[DDIR_READ] += utime_since_now(&td->start);
 775
 776                 if (td->error || td->terminate)
 777                         break;
 778         }
 779
 780         update_rusage_stat(td);
 781         fio_gettime(&td->end_time, NULL);
 782         td->runtime[0] = runtime[0] / 1000;
 783         td->runtime[1] = runtime[1] / 1000;
 784
 785         if (td->ts.bw_log)
 786                 finish_log(td, td->ts.bw_log, "bw");
 787         if (td->ts.slat_log)
 788                 finish_log(td, td->ts.slat_log, "slat");
 789         if (td->ts.clat_log)
 790                 finish_log(td, td->ts.clat_log, "clat");
 791         if (td->write_iolog_file)
 792                 write_iolog_close(td);
 793         if (td->exec_postrun) {
 794                 if (system(td->exec_postrun) < 0)
 795                         log_err("fio: postrun %s failed\n", td->exec_postrun);
 796         }
 797
 798         if (exitall_on_terminate)
 799                 terminate_threads(td->groupid, 0);
 800
 801 err:
 802         if (td->error)
 803                 printf("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
 804         close_files(td);
 805         close_ioengine(td);
 806         cleanup_io_u(td);
 807         td_set_runstate(td, TD_EXITED);
 808         return (void *) (unsigned long) td->error;
 809 }
 810
 811 /*
 812  * We cannot pass the td data into a forked process, so attach the td and
 813  * pass it to the thread worker.
 814  */
 815 static int fork_main(int shmid, int offset)
 816 {
 817         struct thread_data *td;
 818         void *data, *ret;
 819
 820         data = shmat(shmid, NULL, 0);
 821         if (data == (void *) -1) {
 822                 int __err = errno;
 823
 824                 perror("shmat");
 825                 return __err;
 826         }
 827
 828         td = data + offset * sizeof(struct thread_data);
 829         ret = thread_main(td);
 830         shmdt(data);
 831         return (int) (unsigned long) ret;
 832 }
 833
 834 /*
 835  * Run over the job map and reap the threads that have exited, if any.
 836  */
 837 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
 838 {
 839         struct thread_data *td;
 840         int i, cputhreads, pending, status, ret;
 841
 842         /*
 843          * reap exited threads (TD_EXITED -> TD_REAPED)
 844          */
 845         pending = cputhreads = 0;
 846         for_each_td(td, i) {
 847                 int flags = 0;
 848
 849                 /*
 850                  * ->io_ops is NULL for a thread that has closed its
 851                  * io engine
 852                  */
 853                 if (td->io_ops && td->io_ops->flags & FIO_CPUIO)
 854                         cputhreads++;
 855
 856                 if (!td->pid || td->runstate == TD_REAPED)
 857                         continue;
 858                 if (td->use_thread) {
 859                         if (td->runstate == TD_EXITED) {
 860                                 td_set_runstate(td, TD_REAPED);
 861                                 goto reaped;
 862                         }
 863                         continue;
 864                 }
 865
 866                 flags = WNOHANG;
 867                 if (td->runstate == TD_EXITED)
 868                         flags = 0;
 869
 870                 /*
 871                  * check if someone quit or got killed in an unusual way
 872                  */
 873                 ret = waitpid(td->pid, &status, flags);
 874                 if (ret < 0) {
 875                         if (errno == ECHILD) {
 876                                 log_err("fio: pid=%d disappeared %d\n", td->pid, td->runstate);
 877                                 td_set_runstate(td, TD_REAPED);
 878                                 goto reaped;
 879                         }
 880                         perror("waitpid");
 881                 } else if (ret == td->pid) {
 882                         if (WIFSIGNALED(status)) {
 883                                 int sig = WTERMSIG(status);
 884
 885                                 log_err("fio: pid=%d, got signal=%d\n", td->pid, sig);
 886                                 td_set_runstate(td, TD_REAPED);
 887                                 goto reaped;
 888                         }
 889                         if (WIFEXITED(status)) {
 890                                 if (WEXITSTATUS(status) && !td->error)
 891                                         td->error = WEXITSTATUS(status);
 892
 893                                 td_set_runstate(td, TD_REAPED);
 894                                 goto reaped;
 895                         }
 896                 }
 897
 898                 /*
 899                  * thread is not dead, continue
 900                  */
 901                 continue;
 902 reaped:
 903                 if (td->use_thread) {
 904                         long ret;
 905
 906                         if (pthread_join(td->thread, (void *) &ret))
 907                                 perror("pthread_join");
 908                 }
 909
 910                 (*nr_running)--;
 911                 (*m_rate) -= td->ratemin;
 912                 (*t_rate) -= td->rate;
 913
 914                 if (td->error)
 915                         exit_value++;
 916         }
 917
 918         if (*nr_running == cputhreads && !pending)
 919                 terminate_threads(TERMINATE_ALL, 0);
 920 }
 921
 922 /*
 923  * Main function for kicking off and reaping jobs, as needed.
 924  */
 925 static void run_threads(void)
 926 {
 927         struct thread_data *td;
 928         unsigned long spent;
 929         int i, todo, nr_running, m_rate, t_rate, nr_started;
 930
 931         if (fio_pin_memory())
 932                 return;
 933
 934         if (!terse_output) {
 935                 printf("Starting %d thread%s\n", thread_number, thread_number > 1 ? "s" : "");
 936                 fflush(stdout);
 937         }
 938
 939         signal(SIGINT, sig_handler);
 940         signal(SIGALRM, sig_handler);
 941
 942         todo = thread_number;
 943         nr_running = 0;
 944         nr_started = 0;
 945         m_rate = t_rate = 0;
 946
 947         for_each_td(td, i) {
 948                 print_status_init(td->thread_number - 1);
 949
 950                 if (!td->create_serialize) {
 951                         init_disk_util(td);
 952                         continue;
 953                 }
 954
 955                 /*
 956                  * do file setup here so it happens sequentially,
 957                  * we don't want X number of threads getting their
 958                  * client data interspersed on disk
 959                  */
 960                 if (setup_files(td)) {
 961                         exit_value++;
 962                         if (td->error)
 963                                 log_err("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
 964                         td_set_runstate(td, TD_REAPED);
 965                         todo--;
 966                 }
 967
 968                 init_disk_util(td);
 969         }
 970
 971         set_genesis_time();
 972
 973         while (todo) {
 974                 struct thread_data *map[MAX_JOBS];
 975                 struct timeval this_start;
 976                 int this_jobs = 0, left;
 977
 978                 /*
 979                  * create threads (TD_NOT_CREATED -> TD_CREATED)
 980                  */
 981                 for_each_td(td, i) {
 982                         if (td->runstate != TD_NOT_CREATED)
 983                                 continue;
 984
 985                         /*
 986                          * never got a chance to start, killed by other
 987                          * thread for some reason
 988                          */
 989                         if (td->terminate) {
 990                                 todo--;
 991                                 continue;
 992                         }
 993
 994                         if (td->start_delay) {
 995                                 spent = mtime_since_genesis();
 996
 997                                 if (td->start_delay * 1000 > spent)
 998                                         continue;
 999                         }
1000
1001                         if (td->stonewall && (nr_started || nr_running))
1002                                 break;
1003
1004                         /*
1005                          * Set state to created. Thread will transition
1006                          * to TD_INITIALIZED when it's done setting up.
1007                          */
1008                         td_set_runstate(td, TD_CREATED);
1009                         map[this_jobs++] = td;
1010                         fio_sem_init(&startup_sem, 1);
1011                         nr_started++;
1012
1013                         if (td->use_thread) {
1014                                 if (pthread_create(&td->thread, NULL, thread_main, td)) {
1015                                         perror("thread_create");
1016                                         nr_started--;
1017                                 }
1018                         } else {
1019                                 if (fork())
1020                                         fio_sem_down(&startup_sem);
1021                                 else {
1022                                         int ret = fork_main(shm_id, i);
1023
1024                                         exit(ret);
1025                                 }
1026                         }
1027                 }
1028
1029                 /*
1030                  * Wait for the started threads to transition to
1031                  * TD_INITIALIZED.
1032                  */
1033                 fio_gettime(&this_start, NULL);
1034                 left = this_jobs;
1035                 while (left && !fio_abort) {
1036                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1037                                 break;
1038
1039                         usleep(100000);
1040
1041                         for (i = 0; i < this_jobs; i++) {
1042                                 td = map[i];
1043                                 if (!td)
1044                                         continue;
1045                                 if (td->runstate == TD_INITIALIZED) {
1046                                         map[i] = NULL;
1047                                         left--;
1048                                 } else if (td->runstate >= TD_EXITED) {
1049                                         map[i] = NULL;
1050                                         left--;
1051                                         todo--;
1052                                         nr_running++; /* work-around... */
1053                                 }
1054                         }
1055                 }
1056
1057                 if (left) {
1058                         log_err("fio: %d jobs failed to start\n", left);
1059                         for (i = 0; i < this_jobs; i++) {
1060                                 td = map[i];
1061                                 if (!td)
1062                                         continue;
1063                                 kill(td->pid, SIGTERM);
1064                         }
1065                         break;
1066                 }
1067
1068                 /*
1069                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1070                  */
1071                 for_each_td(td, i) {
1072                         if (td->runstate != TD_INITIALIZED)
1073                                 continue;
1074
1075                         td_set_runstate(td, TD_RUNNING);
1076                         nr_running++;
1077                         nr_started--;
1078                         m_rate += td->ratemin;
1079                         t_rate += td->rate;
1080                         todo--;
1081                         fio_sem_up(&td->mutex);
1082                 }
1083
1084                 reap_threads(&nr_running, &t_rate, &m_rate);
1085
1086                 if (todo)
1087                         usleep(100000);
1088         }
1089
1090         while (nr_running) {
1091                 reap_threads(&nr_running, &t_rate, &m_rate);
1092                 usleep(10000);
1093         }
1094
1095         update_io_ticks();
1096         fio_unpin_memory();
1097 }
1098
1099 int main(int argc, char *argv[])
1100 {
1101         long ps;
1102
1103         /*
1104          * We need locale for number printing, if it isn't set then just
1105          * go with the US format.
1106          */
1107         if (!getenv("LC_NUMERIC"))
1108                 setlocale(LC_NUMERIC, "en_US");
1109
1110         if (parse_options(argc, argv))
1111                 return 1;
1112
1113         if (!thread_number) {
1114                 log_err("Nothing to do\n");
1115                 return 1;
1116         }
1117
1118         ps = sysconf(_SC_PAGESIZE);
1119         if (ps < 0) {
1120                 log_err("Failed to get page size\n");
1121                 return 1;
1122         }
1123
1124         page_mask = ps - 1;
1125
1126         if (write_bw_log) {
1127                 setup_log(&agg_io_log[DDIR_READ]);
1128                 setup_log(&agg_io_log[DDIR_WRITE]);
1129         }
1130
1131         set_genesis_time();
1132
1133         disk_util_timer_arm();
1134
1135         run_threads();
1136
1137         if (!fio_abort) {
1138                 show_run_stats();
1139                 if (write_bw_log) {
1140                         __finish_log(agg_io_log[DDIR_READ],"agg-read_bw.log");
1141                         __finish_log(agg_io_log[DDIR_WRITE],"agg-write_bw.log");
1142                 }
1143         }
1144
1145         return exit_value;
1146 }