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 <assert.h>
  30 #include <sys/stat.h>
  31 #include <sys/wait.h>
  32 #include <sys/ipc.h>
  33 #include <sys/shm.h>
  34 #include <sys/ioctl.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
  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[td->ddir] < 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                                 td_verror(td, io_u->error);
 417                                 put_io_u(td, io_u);
 418                                 break;
 419                         }
 420                 }
 421
 422                 add_slat_sample(td, io_u->ddir, mtime_since(&io_u->start_time, &io_u->issue_time));
 423
 424                 if (td->cur_depth < td->iodepth) {
 425                         struct timespec ts = { .tv_sec = 0, .tv_nsec = 0};
 426
 427                         timeout = &ts;
 428                         min_evts = 0;
 429                 } else {
 430                         timeout = NULL;
 431                         min_evts = 1;
 432                 }
 433
 434                 ret = td_io_getevents(td, min_evts, td->cur_depth, timeout);
 435                 if (ret < 0) {
 436                         td_verror(td, ret);
 437                         break;
 438                 } else if (!ret)
 439                         continue;
 440
 441                 icd.nr = ret;
 442                 ios_completed(td, &icd);
 443                 if (icd.error) {
 444                         td_verror(td, icd.error);
 445                         break;
 446                 }
 447
 448                 /*
 449                  * the rate is batched for now, it should work for batches
 450                  * of completions except the very first one which may look
 451                  * a little bursty
 452                  */
 453                 usec = utime_since(&s, &icd.time);
 454
 455                 rate_throttle(td, usec, icd.bytes_done[td->ddir], td->ddir);
 456
 457                 if (check_min_rate(td, &icd.time)) {
 458                         if (exitall_on_terminate)
 459                                 terminate_threads(td->groupid, 0);
 460                         td_verror(td, ENODATA);
 461                         break;
 462                 }
 463
 464                 if (runtime_exceeded(td, &icd.time))
 465                         break;
 466
 467                 if (td->thinktime) {
 468                         unsigned long long b;
 469
 470                         b = td->io_blocks[0] + td->io_blocks[1];
 471                         if (!(b % td->thinktime_blocks))
 472                                 usec_sleep(td, td->thinktime);
 473                 }
 474         }
 475
 476         if (!td->error) {
 477                 if (td->cur_depth)
 478                         cleanup_pending_aio(td);
 479
 480                 if (should_fsync(td) && td->end_fsync) {
 481                         td_set_runstate(td, TD_FSYNCING);
 482                         for_each_file(td, f, i)
 483                                 fio_io_sync(td, f);
 484                 }
 485         }
 486 }
 487
 488 static void cleanup_io_u(struct thread_data *td)
 489 {
 490         struct list_head *entry, *n;
 491         struct io_u *io_u;
 492
 493         list_for_each_safe(entry, n, &td->io_u_freelist) {
 494                 io_u = list_entry(entry, struct io_u, list);
 495
 496                 list_del(&io_u->list);
 497                 free(io_u);
 498         }
 499
 500         free_io_mem(td);
 501 }
 502
 503 /*
 504  * "randomly" fill the buffer contents
 505  */
 506 static void fill_rand_buf(struct io_u *io_u, int max_bs)
 507 {
 508         int *ptr = io_u->buf;
 509
 510         while ((void *) ptr - io_u->buf < max_bs) {
 511                 *ptr = rand() * 0x9e370001;
 512                 ptr++;
 513         }
 514 }
 515
 516 static int init_io_u(struct thread_data *td)
 517 {
 518         struct io_u *io_u;
 519         unsigned int max_bs;
 520         int i, max_units;
 521         char *p;
 522
 523         if (td->io_ops->flags & FIO_CPUIO)
 524                 return 0;
 525
 526         if (td->io_ops->flags & FIO_SYNCIO)
 527                 max_units = 1;
 528         else
 529                 max_units = td->iodepth;
 530
 531         max_bs = max(td->max_bs[DDIR_READ], td->max_bs[DDIR_WRITE]);
 532         td->orig_buffer_size = max_bs * max_units;
 533
 534         if (td->mem_type == MEM_SHMHUGE || td->mem_type == MEM_MMAPHUGE)
 535                 td->orig_buffer_size = (td->orig_buffer_size + td->hugepage_size - 1) & ~(td->hugepage_size - 1);
 536         else
 537                 td->orig_buffer_size += page_mask;
 538
 539         if (allocate_io_mem(td))
 540                 return 1;
 541
 542         p = ALIGN(td->orig_buffer);
 543         for (i = 0; i < max_units; i++) {
 544                 io_u = malloc(sizeof(*io_u));
 545                 memset(io_u, 0, sizeof(*io_u));
 546                 INIT_LIST_HEAD(&io_u->list);
 547
 548                 io_u->buf = p + max_bs * i;
 549                 if (td_write(td) || td_rw(td))
 550                         fill_rand_buf(io_u, max_bs);
 551
 552                 io_u->index = i;
 553                 list_add(&io_u->list, &td->io_u_freelist);
 554         }
 555
 556         return 0;
 557 }
 558
 559 static int switch_ioscheduler(struct thread_data *td)
 560 {
 561         char tmp[256], tmp2[128];
 562         FILE *f;
 563         int ret;
 564
 565         if (td->io_ops->flags & FIO_CPUIO)
 566                 return 0;
 567
 568         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
 569
 570         f = fopen(tmp, "r+");
 571         if (!f) {
 572                 td_verror(td, errno);
 573                 return 1;
 574         }
 575
 576         /*
 577          * Set io scheduler.
 578          */
 579         ret = fwrite(td->ioscheduler, strlen(td->ioscheduler), 1, f);
 580         if (ferror(f) || ret != 1) {
 581                 td_verror(td, errno);
 582                 fclose(f);
 583                 return 1;
 584         }
 585
 586         rewind(f);
 587
 588         /*
 589          * Read back and check that the selected scheduler is now the default.
 590          */
 591         ret = fread(tmp, 1, sizeof(tmp), f);
 592         if (ferror(f) || ret < 0) {
 593                 td_verror(td, errno);
 594                 fclose(f);
 595                 return 1;
 596         }
 597
 598         sprintf(tmp2, "[%s]", td->ioscheduler);
 599         if (!strstr(tmp, tmp2)) {
 600                 log_err("fio: io scheduler %s not found\n", td->ioscheduler);
 601                 td_verror(td, EINVAL);
 602                 fclose(f);
 603                 return 1;
 604         }
 605
 606         fclose(f);
 607         return 0;
 608 }
 609
 610 static void clear_io_state(struct thread_data *td)
 611 {
 612         struct fio_file *f;
 613         int i;
 614
 615         td->stat_io_bytes[0] = td->stat_io_bytes[1] = 0;
 616         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
 617         td->zone_bytes = 0;
 618
 619         for_each_file(td, f, i) {
 620                 f->last_pos = 0;
 621                 if (td->io_ops->flags & FIO_SYNCIO)
 622                         lseek(f->fd, SEEK_SET, 0);
 623
 624                 if (f->file_map)
 625                         memset(f->file_map, 0, f->num_maps * sizeof(long));
 626         }
 627 }
 628
 629 /*
 630  * Entry point for the thread based jobs. The process based jobs end up
 631  * here as well, after a little setup.
 632  */
 633 static void *thread_main(void *data)
 634 {
 635         unsigned long long runtime[2];
 636         struct thread_data *td = data;
 637
 638         if (!td->use_thread)
 639                 setsid();
 640
 641         td->pid = getpid();
 642
 643         INIT_LIST_HEAD(&td->io_u_freelist);
 644         INIT_LIST_HEAD(&td->io_u_busylist);
 645         INIT_LIST_HEAD(&td->io_hist_list);
 646         INIT_LIST_HEAD(&td->io_log_list);
 647
 648         if (init_io_u(td))
 649                 goto err;
 650
 651         if (fio_setaffinity(td) == -1) {
 652                 td_verror(td, errno);
 653                 goto err;
 654         }
 655
 656         if (init_iolog(td))
 657                 goto err;
 658
 659         if (td->ioprio) {
 660                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
 661                         td_verror(td, errno);
 662                         goto err;
 663                 }
 664         }
 665
 666         if (nice(td->nice) == -1) {
 667                 td_verror(td, errno);
 668                 goto err;
 669         }
 670
 671         if (init_random_state(td))
 672                 goto err;
 673
 674         if (td->ioscheduler && switch_ioscheduler(td))
 675                 goto err;
 676
 677         td_set_runstate(td, TD_INITIALIZED);
 678         fio_sem_up(&startup_sem);
 679         fio_sem_down(&td->mutex);
 680
 681         if (!td->create_serialize && setup_files(td))
 682                 goto err;
 683         if (open_files(td))
 684                 goto err;
 685
 686         /*
 687          * Do this late, as some IO engines would like to have the
 688          * files setup prior to initializing structures.
 689          */
 690         if (td_io_init(td))
 691                 goto err;
 692
 693         if (td->exec_prerun) {
 694                 if (system(td->exec_prerun) < 0)
 695                         goto err;
 696         }
 697
 698         fio_gettime(&td->epoch, NULL);
 699         getrusage(RUSAGE_SELF, &td->ru_start);
 700
 701         runtime[0] = runtime[1] = 0;
 702         while (td->loops--) {
 703                 fio_gettime(&td->start, NULL);
 704                 memcpy(&td->stat_sample_time, &td->start, sizeof(td->start));
 705
 706                 if (td->ratemin)
 707                         memcpy(&td->lastrate, &td->stat_sample_time, sizeof(td->lastrate));
 708
 709                 clear_io_state(td);
 710                 prune_io_piece_log(td);
 711
 712                 if (td->io_ops->flags & FIO_CPUIO)
 713                         do_cpuio(td);
 714                 else
 715                         do_io(td);
 716
 717                 runtime[td->ddir] += utime_since_now(&td->start);
 718                 if (td_rw(td) && td->io_bytes[td->ddir ^ 1])
 719                         runtime[td->ddir ^ 1] = runtime[td->ddir];
 720
 721                 if (td->error || td->terminate)
 722                         break;
 723
 724                 if (td->verify == VERIFY_NONE)
 725                         continue;
 726
 727                 clear_io_state(td);
 728                 fio_gettime(&td->start, NULL);
 729
 730                 do_verify(td);
 731
 732                 runtime[DDIR_READ] += utime_since_now(&td->start);
 733
 734                 if (td->error || td->terminate)
 735                         break;
 736         }
 737
 738         update_rusage_stat(td);
 739         fio_gettime(&td->end_time, NULL);
 740         td->runtime[0] = runtime[0] / 1000;
 741         td->runtime[1] = runtime[1] / 1000;
 742
 743         if (td->bw_log)
 744                 finish_log(td, td->bw_log, "bw");
 745         if (td->slat_log)
 746                 finish_log(td, td->slat_log, "slat");
 747         if (td->clat_log)
 748                 finish_log(td, td->clat_log, "clat");
 749         if (td->write_iolog_file)
 750                 write_iolog_close(td);
 751         if (td->exec_postrun) {
 752                 if (system(td->exec_postrun) < 0)
 753                         log_err("fio: postrun %s failed\n", td->exec_postrun);
 754         }
 755
 756         if (exitall_on_terminate)
 757                 terminate_threads(td->groupid, 0);
 758
 759 err:
 760         close_files(td);
 761         close_ioengine(td);
 762         cleanup_io_u(td);
 763         td_set_runstate(td, TD_EXITED);
 764         return NULL;
 765
 766 }
 767
 768 /*
 769  * We cannot pass the td data into a forked process, so attach the td and
 770  * pass it to the thread worker.
 771  */
 772 static void *fork_main(int shmid, int offset)
 773 {
 774         struct thread_data *td;
 775         void *data;
 776
 777         data = shmat(shmid, NULL, 0);
 778         if (data == (void *) -1) {
 779                 perror("shmat");
 780                 return NULL;
 781         }
 782
 783         td = data + offset * sizeof(struct thread_data);
 784         thread_main(td);
 785         shmdt(data);
 786         return NULL;
 787 }
 788
 789 /*
 790  * Run over the job map and reap the threads that have exited, if any.
 791  */
 792 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
 793 {
 794         struct thread_data *td;
 795         int i, cputhreads, pending;
 796
 797         /*
 798          * reap exited threads (TD_EXITED -> TD_REAPED)
 799          */
 800         pending = cputhreads = 0;
 801         for_each_td(td, i) {
 802                 /*
 803                  * ->io_ops is NULL for a thread that has closed its
 804                  * io engine
 805                  */
 806                 if (td->io_ops && td->io_ops->flags & FIO_CPUIO)
 807                         cputhreads++;
 808
 809                 if (td->runstate != TD_EXITED) {
 810                         if (td->runstate < TD_RUNNING)
 811                                 pending++;
 812
 813                         continue;
 814                 }
 815
 816                 td_set_runstate(td, TD_REAPED);
 817
 818                 if (td->use_thread) {
 819                         long ret;
 820
 821                         if (pthread_join(td->thread, (void *) &ret))
 822                                 perror("thread_join");
 823                 } else
 824                         waitpid(td->pid, NULL, 0);
 825
 826                 (*nr_running)--;
 827                 (*m_rate) -= td->ratemin;
 828                 (*t_rate) -= td->rate;
 829         }
 830
 831         if (*nr_running == cputhreads && !pending)
 832                 terminate_threads(TERMINATE_ALL, 0);
 833 }
 834
 835 /*
 836  * Main function for kicking off and reaping jobs, as needed.
 837  */
 838 static void run_threads(void)
 839 {
 840         struct thread_data *td;
 841         unsigned long spent;
 842         int i, todo, nr_running, m_rate, t_rate, nr_started;
 843
 844         if (fio_pin_memory())
 845                 return;
 846
 847         if (!terse_output) {
 848                 printf("Starting %d thread%s\n", thread_number, thread_number > 1 ? "s" : "");
 849                 fflush(stdout);
 850         }
 851
 852         signal(SIGINT, sig_handler);
 853         signal(SIGALRM, sig_handler);
 854
 855         todo = thread_number;
 856         nr_running = 0;
 857         nr_started = 0;
 858         m_rate = t_rate = 0;
 859
 860         for_each_td(td, i) {
 861                 print_status_init(td->thread_number - 1);
 862
 863                 if (!td->create_serialize) {
 864                         init_disk_util(td);
 865                         continue;
 866                 }
 867
 868                 /*
 869                  * do file setup here so it happens sequentially,
 870                  * we don't want X number of threads getting their
 871                  * client data interspersed on disk
 872                  */
 873                 if (setup_files(td)) {
 874                         td_set_runstate(td, TD_REAPED);
 875                         todo--;
 876                 }
 877
 878                 init_disk_util(td);
 879         }
 880
 881         while (todo) {
 882                 struct thread_data *map[MAX_JOBS];
 883                 struct timeval this_start;
 884                 int this_jobs = 0, left;
 885
 886                 /*
 887                  * create threads (TD_NOT_CREATED -> TD_CREATED)
 888                  */
 889                 for_each_td(td, i) {
 890                         if (td->runstate != TD_NOT_CREATED)
 891                                 continue;
 892
 893                         /*
 894                          * never got a chance to start, killed by other
 895                          * thread for some reason
 896                          */
 897                         if (td->terminate) {
 898                                 todo--;
 899                                 continue;
 900                         }
 901
 902                         if (td->start_delay) {
 903                                 spent = mtime_since_genesis();
 904
 905                                 if (td->start_delay * 1000 > spent)
 906                                         continue;
 907                         }
 908
 909                         if (td->stonewall && (nr_started || nr_running))
 910                                 break;
 911
 912                         /*
 913                          * Set state to created. Thread will transition
 914                          * to TD_INITIALIZED when it's done setting up.
 915                          */
 916                         td_set_runstate(td, TD_CREATED);
 917                         map[this_jobs++] = td;
 918                         fio_sem_init(&startup_sem, 1);
 919                         nr_started++;
 920
 921                         if (td->use_thread) {
 922                                 if (pthread_create(&td->thread, NULL, thread_main, td)) {
 923                                         perror("thread_create");
 924                                         nr_started--;
 925                                 }
 926                         } else {
 927                                 if (fork())
 928                                         fio_sem_down(&startup_sem);
 929                                 else {
 930                                         fork_main(shm_id, i);
 931                                         exit(0);
 932                                 }
 933                         }
 934                 }
 935
 936                 /*
 937                  * Wait for the started threads to transition to
 938                  * TD_INITIALIZED.
 939                  */
 940                 fio_gettime(&this_start, NULL);
 941                 left = this_jobs;
 942                 while (left && !fio_abort) {
 943                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
 944                                 break;
 945
 946                         usleep(100000);
 947
 948                         for (i = 0; i < this_jobs; i++) {
 949                                 td = map[i];
 950                                 if (!td)
 951                                         continue;
 952                                 if (td->runstate == TD_INITIALIZED) {
 953                                         map[i] = NULL;
 954                                         left--;
 955                                 } else if (td->runstate >= TD_EXITED) {
 956                                         map[i] = NULL;
 957                                         left--;
 958                                         todo--;
 959                                         nr_running++; /* work-around... */
 960                                 }
 961                         }
 962                 }
 963
 964                 if (left) {
 965                         log_err("fio: %d jobs failed to start\n", left);
 966                         for (i = 0; i < this_jobs; i++) {
 967                                 td = map[i];
 968                                 if (!td)
 969                                         continue;
 970                                 kill(td->pid, SIGTERM);
 971                         }
 972                         break;
 973                 }
 974
 975                 /*
 976                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
 977                  */
 978                 for_each_td(td, i) {
 979                         if (td->runstate != TD_INITIALIZED)
 980                                 continue;
 981
 982                         td_set_runstate(td, TD_RUNNING);
 983                         nr_running++;
 984                         nr_started--;
 985                         m_rate += td->ratemin;
 986                         t_rate += td->rate;
 987                         todo--;
 988                         fio_sem_up(&td->mutex);
 989                 }
 990
 991                 reap_threads(&nr_running, &t_rate, &m_rate);
 992
 993                 if (todo)
 994                         usleep(100000);
 995         }
 996
 997         while (nr_running) {
 998                 reap_threads(&nr_running, &t_rate, &m_rate);
 999                 usleep(10000);
1000         }
1001
1002         update_io_ticks();
1003         fio_unpin_memory();
1004 }
1005
1006 int main(int argc, char *argv[])
1007 {
1008         long ps;
1009
1010         if (parse_options(argc, argv))
1011                 return 1;
1012
1013         if (!thread_number) {
1014                 log_err("Nothing to do\n");
1015                 return 1;
1016         }
1017
1018         ps = sysconf(_SC_PAGESIZE);
1019         if (ps < 0) {
1020                 log_err("Failed to get page size\n");
1021                 return 1;
1022         }
1023
1024         page_mask = ps - 1;
1025
1026         if (write_bw_log) {
1027                 setup_log(&agg_io_log[DDIR_READ]);
1028                 setup_log(&agg_io_log[DDIR_WRITE]);
1029         }
1030
1031         disk_util_timer_arm();
1032
1033         run_threads();
1034
1035         if (!fio_abort) {
1036                 show_run_stats();
1037                 if (write_bw_log) {
1038                         __finish_log(agg_io_log[DDIR_READ],"agg-read_bw.log");
1039                         __finish_log(agg_io_log[DDIR_WRITE],"agg-write_bw.log");
1040                 }
1041         }
1042
1043         return 0;
1044 }