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