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          * No minimum rate set, always ok
 105          */
 106         if (!td->ratemin)
 107                 return 0;
 108
 109         /*
 110          * allow a 2 second settle period in the beginning
 111          */
 112         if (mtime_since(&td->start, now) < 2000)
 113                 return 0;
 114
 115         if (td_read(td))
 116                 bytes += td->this_io_bytes[DDIR_READ];
 117         if (td_write(td))
 118                 bytes += td->this_io_bytes[DDIR_WRITE];
 119
 120         /*
 121          * if rate blocks is set, sample is running
 122          */
 123         if (td->rate_bytes) {
 124                 spent = mtime_since(&td->lastrate, now);
 125                 if (spent < td->ratecycle)
 126                         return 0;
 127
 128                 if (bytes < td->rate_bytes) {
 129                         fprintf(f_out, "%s: min rate %u not met\n", td->name, td->ratemin);
 130                         return 1;
 131                 } else {
 132                         rate = (bytes - td->rate_bytes) / spent;
 133                         if (rate < td->ratemin || bytes < td->rate_bytes) {
 134                                 fprintf(f_out, "%s: min rate %u not met, got %luKiB/sec\n", td->name, td->ratemin, rate);
 135                                 return 1;
 136                         }
 137                 }
 138         }
 139
 140         td->rate_bytes = bytes;
 141         memcpy(&td->lastrate, now, sizeof(*now));
 142         return 0;
 143 }
 144
 145 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
 146 {
 147         if (!td->timeout)
 148                 return 0;
 149         if (mtime_since(&td->epoch, t) >= td->timeout * 1000)
 150                 return 1;
 151
 152         return 0;
 153 }
 154
 155 /*
 156  * When job exits, we can cancel the in-flight IO if we are using async
 157  * io. Attempt to do so.
 158  */
 159 static void cleanup_pending_aio(struct thread_data *td)
 160 {
 161         struct list_head *entry, *n;
 162         struct io_u *io_u;
 163         int r;
 164
 165         /*
 166          * get immediately available events, if any
 167          */
 168         r = io_u_queued_complete(td, 0);
 169         if (r < 0)
 170                 return;
 171
 172         /*
 173          * now cancel remaining active events
 174          */
 175         if (td->io_ops->cancel) {
 176                 list_for_each_safe(entry, n, &td->io_u_busylist) {
 177                         io_u = list_entry(entry, struct io_u, list);
 178
 179                         /*
 180                          * if the io_u isn't in flight, then that generally
 181                          * means someone leaked an io_u. complain but fix
 182                          * it up, so we don't stall here.
 183                          */
 184                         if ((io_u->flags & IO_U_F_FLIGHT) == 0) {
 185                                 log_err("fio: non-busy IO on busy list\n");
 186                                 put_io_u(td, io_u);
 187                         } else {
 188                                 r = td->io_ops->cancel(td, io_u);
 189                                 if (!r)
 190                                         put_io_u(td, io_u);
 191                         }
 192                 }
 193         }
 194
 195         if (td->cur_depth)
 196                 r = io_u_queued_complete(td, td->cur_depth);
 197 }
 198
 199 /*
 200  * Helper to handle the final sync of a file. Works just like the normal
 201  * io path, just does everything sync.
 202  */
 203 static int fio_io_sync(struct thread_data *td, struct fio_file *f)
 204 {
 205         struct io_u *io_u = __get_io_u(td);
 206         int ret;
 207
 208         if (!io_u)
 209                 return 1;
 210
 211         io_u->ddir = DDIR_SYNC;
 212         io_u->file = f;
 213
 214         if (td_io_prep(td, io_u)) {
 215                 put_io_u(td, io_u);
 216                 return 1;
 217         }
 218
 219 requeue:
 220         ret = td_io_queue(td, io_u);
 221         if (ret < 0) {
 222                 td_verror(td, io_u->error, "td_io_queue");
 223                 put_io_u(td, io_u);
 224                 return 1;
 225         } else if (ret == FIO_Q_QUEUED) {
 226                 if (io_u_queued_complete(td, 1) < 0)
 227                         return 1;
 228         } else if (ret == FIO_Q_COMPLETED) {
 229                 if (io_u->error) {
 230                         td_verror(td, io_u->error, "td_io_queue");
 231                         return 1;
 232                 }
 233
 234                 if (io_u_sync_complete(td, io_u) < 0)
 235                         return 1;
 236         } else if (ret == FIO_Q_BUSY) {
 237                 if (td_io_commit(td))
 238                         return 1;
 239                 goto requeue;
 240         }
 241
 242         return 0;
 243 }
 244
 245 /*
 246  * The main verify engine. Runs over the writes we previusly submitted,
 247  * reads the blocks back in, and checks the crc/md5 of the data.
 248  */
 249 static void do_verify(struct thread_data *td)
 250 {
 251         struct fio_file *f;
 252         struct io_u *io_u;
 253         int ret, i, min_events;
 254
 255         /*
 256          * sync io first and invalidate cache, to make sure we really
 257          * read from disk.
 258          */
 259         for_each_file(td, f, i) {
 260                 if (fio_io_sync(td, f))
 261                         break;
 262                 if (file_invalidate_cache(td, f))
 263                         break;
 264         }
 265
 266         if (td->error)
 267                 return;
 268
 269         td_set_runstate(td, TD_VERIFYING);
 270
 271         io_u = NULL;
 272         while (!td->terminate) {
 273                 io_u = __get_io_u(td);
 274                 if (!io_u)
 275                         break;
 276
 277                 if (runtime_exceeded(td, &io_u->start_time)) {
 278                         put_io_u(td, io_u);
 279                         break;
 280                 }
 281
 282                 if (get_next_verify(td, io_u)) {
 283                         put_io_u(td, io_u);
 284                         break;
 285                 }
 286
 287                 if (td_io_prep(td, io_u)) {
 288                         put_io_u(td, io_u);
 289                         break;
 290                 }
 291
 292                 io_u->end_io = verify_io_u;
 293 requeue:
 294                 ret = td_io_queue(td, io_u);
 295
 296                 switch (ret) {
 297                 case FIO_Q_COMPLETED:
 298                         if (io_u->error)
 299                                 ret = -io_u->error;
 300                         if (io_u->xfer_buflen != io_u->resid && io_u->resid) {
 301                                 int bytes = io_u->xfer_buflen - io_u->resid;
 302
 303                                 io_u->xfer_buflen = io_u->resid;
 304                                 io_u->xfer_buf += bytes;
 305                                 goto requeue;
 306                         }
 307                         ret = io_u_sync_complete(td, io_u);
 308                         if (ret < 0)
 309                                 break;
 310                         continue;
 311                 case FIO_Q_QUEUED:
 312                         break;
 313                 case FIO_Q_BUSY:
 314                         requeue_io_u(td, &io_u);
 315                         ret = td_io_commit(td);
 316                         break;
 317                 default:
 318                         assert(ret < 0);
 319                         td_verror(td, -ret, "td_io_queue");
 320                         break;
 321                 }
 322
 323                 if (ret < 0 || td->error)
 324                         break;
 325
 326                 /*
 327                  * if we can queue more, do so. but check if there are
 328                  * completed io_u's first.
 329                  */
 330                 min_events = 0;
 331                 if (queue_full(td) || ret == FIO_Q_BUSY) {
 332                         min_events = 1;
 333
 334                         if (td->cur_depth > td->iodepth_low)
 335                                 min_events = td->cur_depth - td->iodepth_low;
 336                 }
 337
 338                 /*
 339                  * Reap required number of io units, if any, and do the
 340                  * verification on them through the callback handler
 341                  */
 342                 if (io_u_queued_complete(td, min_events) < 0)
 343                         break;
 344         }
 345
 346         if (!td->error) {
 347                 min_events = td->cur_depth;
 348
 349                 if (min_events)
 350                         ret = io_u_queued_complete(td, min_events);
 351         } else
 352                 cleanup_pending_aio(td);
 353
 354         td_set_runstate(td, TD_RUNNING);
 355 }
 356
 357 /*
 358  * Not really an io thread, all it does is burn CPU cycles in the specified
 359  * manner.
 360  */
 361 static void do_cpuio(struct thread_data *td)
 362 {
 363         struct timeval e;
 364         int split = 100 / td->cpuload;
 365         int i = 0;
 366
 367         while (!td->terminate) {
 368                 fio_gettime(&e, NULL);
 369
 370                 if (runtime_exceeded(td, &e))
 371                         break;
 372
 373                 if (!(i % split))
 374                         __usec_sleep(10000);
 375                 else
 376                         usec_sleep(td, 10000);
 377
 378                 i++;
 379         }
 380 }
 381
 382 /*
 383  * Main IO worker function. It retrieves io_u's to process and queues
 384  * and reaps them, checking for rate and errors along the way.
 385  */
 386 static void do_io(struct thread_data *td)
 387 {
 388         struct timeval s;
 389         unsigned long usec;
 390         int i, ret = 0;
 391
 392         td_set_runstate(td, TD_RUNNING);
 393
 394         while ((td->this_io_bytes[0] + td->this_io_bytes[1]) < td->io_size) {
 395                 struct timeval comp_time;
 396                 long bytes_done = 0;
 397                 int min_evts = 0;
 398                 struct io_u *io_u;
 399
 400                 if (td->terminate)
 401                         break;
 402
 403                 io_u = get_io_u(td);
 404                 if (!io_u)
 405                         break;
 406
 407                 memcpy(&s, &io_u->start_time, sizeof(s));
 408
 409                 if (runtime_exceeded(td, &s)) {
 410                         put_io_u(td, io_u);
 411                         break;
 412                 }
 413 requeue:
 414                 ret = td_io_queue(td, io_u);
 415
 416                 switch (ret) {
 417                 case FIO_Q_COMPLETED:
 418                         if (io_u->error) {
 419                                 ret = io_u->error;
 420                                 break;
 421                         }
 422                         if (io_u->xfer_buflen != io_u->resid && io_u->resid) {
 423                                 int bytes = io_u->xfer_buflen - io_u->resid;
 424
 425                                 io_u->xfer_buflen = io_u->resid;
 426                                 io_u->xfer_buf += bytes;
 427                                 goto requeue;
 428                         }
 429                         fio_gettime(&comp_time, NULL);
 430                         bytes_done = io_u_sync_complete(td, io_u);
 431                         if (bytes_done < 0)
 432                                 ret = bytes_done;
 433                         break;
 434                 case FIO_Q_QUEUED:
 435                         /*
 436                          * if the engine doesn't have a commit hook,
 437                          * the io_u is really queued. if it does have such
 438                          * a hook, it has to call io_u_queued() itself.
 439                          */
 440                         if (td->io_ops->commit == NULL)
 441                                 io_u_queued(td, io_u);
 442                         break;
 443                 case FIO_Q_BUSY:
 444                         requeue_io_u(td, &io_u);
 445                         ret = td_io_commit(td);
 446                         break;
 447                 default:
 448                         assert(ret < 0);
 449                         put_io_u(td, io_u);
 450                         break;
 451                 }
 452
 453                 if (ret < 0 || td->error)
 454                         break;
 455
 456                 /*
 457                  * See if we need to complete some commands
 458                  */
 459                 if (ret == FIO_Q_QUEUED || ret == FIO_Q_BUSY) {
 460                         min_evts = 0;
 461                         if (queue_full(td) || ret == FIO_Q_BUSY) {
 462                                 min_evts = 1;
 463
 464                                 if (td->cur_depth > td->iodepth_low)
 465                                         min_evts = td->cur_depth - td->iodepth_low;
 466                         }
 467
 468                         fio_gettime(&comp_time, NULL);
 469                         bytes_done = io_u_queued_complete(td, min_evts);
 470                         if (bytes_done < 0)
 471                                 break;
 472                 }
 473
 474                 if (!bytes_done)
 475                         continue;
 476
 477                 /*
 478                  * the rate is batched for now, it should work for batches
 479                  * of completions except the very first one which may look
 480                  * a little bursty
 481                  */
 482                 usec = utime_since(&s, &comp_time);
 483
 484                 rate_throttle(td, usec, bytes_done);
 485
 486                 if (check_min_rate(td, &comp_time)) {
 487                         if (exitall_on_terminate)
 488                                 terminate_threads(td->groupid, 0);
 489                         td_verror(td, ENODATA, "check_min_rate");
 490                         break;
 491                 }
 492
 493                 if (td->thinktime) {
 494                         unsigned long long b;
 495
 496                         b = td->io_blocks[0] + td->io_blocks[1];
 497                         if (!(b % td->thinktime_blocks)) {
 498                                 int left;
 499
 500                                 if (td->thinktime_spin)
 501                                         __usec_sleep(td->thinktime_spin);
 502
 503                                 left = td->thinktime - td->thinktime_spin;
 504                                 if (left)
 505                                         usec_sleep(td, left);
 506                         }
 507                 }
 508         }
 509
 510         if (!td->error) {
 511                 struct fio_file *f;
 512
 513                 i = td->cur_depth;
 514                 if (i)
 515                         ret = io_u_queued_complete(td, i);
 516
 517                 if (should_fsync(td) && td->end_fsync) {
 518                         td_set_runstate(td, TD_FSYNCING);
 519                         for_each_file(td, f, i)
 520                                 fio_io_sync(td, f);
 521                 }
 522         } else
 523                 cleanup_pending_aio(td);
 524 }
 525
 526 static void cleanup_io_u(struct thread_data *td)
 527 {
 528         struct list_head *entry, *n;
 529         struct io_u *io_u;
 530
 531         list_for_each_safe(entry, n, &td->io_u_freelist) {
 532                 io_u = list_entry(entry, struct io_u, list);
 533
 534                 list_del(&io_u->list);
 535                 free(io_u);
 536         }
 537
 538         free_io_mem(td);
 539 }
 540
 541 /*
 542  * "randomly" fill the buffer contents
 543  */
 544 static void fill_rand_buf(struct io_u *io_u, int max_bs)
 545 {
 546         int *ptr = io_u->buf;
 547
 548         while ((void *) ptr - io_u->buf < max_bs) {
 549                 *ptr = rand() * 0x9e370001;
 550                 ptr++;
 551         }
 552 }
 553
 554 static int init_io_u(struct thread_data *td)
 555 {
 556         struct io_u *io_u;
 557         unsigned int max_bs;
 558         int i, max_units;
 559         char *p;
 560
 561         if (td->io_ops->flags & FIO_CPUIO)
 562                 return 0;
 563
 564         if (td->io_ops->flags & FIO_SYNCIO)
 565                 max_units = 1;
 566         else
 567                 max_units = td->iodepth;
 568
 569         max_bs = max(td->max_bs[DDIR_READ], td->max_bs[DDIR_WRITE]);
 570         td->orig_buffer_size = max_bs * max_units;
 571
 572         if (td->mem_type == MEM_SHMHUGE || td->mem_type == MEM_MMAPHUGE)
 573                 td->orig_buffer_size = (td->orig_buffer_size + td->hugepage_size - 1) & ~(td->hugepage_size - 1);
 574         else
 575                 td->orig_buffer_size += page_mask;
 576
 577         if (allocate_io_mem(td))
 578                 return 1;
 579
 580         p = ALIGN(td->orig_buffer);
 581         for (i = 0; i < max_units; i++) {
 582                 io_u = malloc(sizeof(*io_u));
 583                 memset(io_u, 0, sizeof(*io_u));
 584                 INIT_LIST_HEAD(&io_u->list);
 585
 586                 io_u->buf = p + max_bs * i;
 587                 if (td_write(td) || td_rw(td))
 588                         fill_rand_buf(io_u, max_bs);
 589
 590                 io_u->index = i;
 591                 io_u->flags = IO_U_F_FREE;
 592                 list_add(&io_u->list, &td->io_u_freelist);
 593         }
 594
 595         io_u_init_timeout();
 596
 597         return 0;
 598 }
 599
 600 static int switch_ioscheduler(struct thread_data *td)
 601 {
 602         char tmp[256], tmp2[128];
 603         FILE *f;
 604         int ret;
 605
 606         if (td->io_ops->flags & FIO_CPUIO)
 607                 return 0;
 608
 609         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
 610
 611         f = fopen(tmp, "r+");
 612         if (!f) {
 613                 td_verror(td, errno, "fopen");
 614                 return 1;
 615         }
 616
 617         /*
 618          * Set io scheduler.
 619          */
 620         ret = fwrite(td->ioscheduler, strlen(td->ioscheduler), 1, f);
 621         if (ferror(f) || ret != 1) {
 622                 td_verror(td, errno, "fwrite");
 623                 fclose(f);
 624                 return 1;
 625         }
 626
 627         rewind(f);
 628
 629         /*
 630          * Read back and check that the selected scheduler is now the default.
 631          */
 632         ret = fread(tmp, 1, sizeof(tmp), f);
 633         if (ferror(f) || ret < 0) {
 634                 td_verror(td, errno, "fread");
 635                 fclose(f);
 636                 return 1;
 637         }
 638
 639         sprintf(tmp2, "[%s]", td->ioscheduler);
 640         if (!strstr(tmp, tmp2)) {
 641                 log_err("fio: io scheduler %s not found\n", td->ioscheduler);
 642                 td_verror(td, EINVAL, "iosched_switch");
 643                 fclose(f);
 644                 return 1;
 645         }
 646
 647         fclose(f);
 648         return 0;
 649 }
 650
 651 static void clear_io_state(struct thread_data *td)
 652 {
 653         struct fio_file *f;
 654         int i;
 655
 656         td->ts.stat_io_bytes[0] = td->ts.stat_io_bytes[1] = 0;
 657         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
 658         td->zone_bytes = 0;
 659
 660         td->last_was_sync = 0;
 661
 662         for_each_file(td, f, i) {
 663                 f->last_completed_pos = 0;
 664
 665                 f->last_pos = 0;
 666                 if (td->io_ops->flags & FIO_SYNCIO)
 667                         lseek(f->fd, SEEK_SET, 0);
 668
 669                 if (f->file_map)
 670                         memset(f->file_map, 0, f->num_maps * sizeof(long));
 671         }
 672 }
 673
 674 /*
 675  * Entry point for the thread based jobs. The process based jobs end up
 676  * here as well, after a little setup.
 677  */
 678 static void *thread_main(void *data)
 679 {
 680         unsigned long long runtime[2];
 681         struct thread_data *td = data;
 682
 683         if (!td->use_thread)
 684                 setsid();
 685
 686         td->pid = getpid();
 687
 688         INIT_LIST_HEAD(&td->io_u_freelist);
 689         INIT_LIST_HEAD(&td->io_u_busylist);
 690         INIT_LIST_HEAD(&td->io_u_requeues);
 691         INIT_LIST_HEAD(&td->io_hist_list);
 692         INIT_LIST_HEAD(&td->io_log_list);
 693
 694         if (init_io_u(td))
 695                 goto err;
 696
 697         if (fio_setaffinity(td) == -1) {
 698                 td_verror(td, errno, "cpu_set_affinity");
 699                 goto err;
 700         }
 701
 702         if (init_iolog(td))
 703                 goto err;
 704
 705         if (td->ioprio) {
 706                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
 707                         td_verror(td, errno, "ioprio_set");
 708                         goto err;
 709                 }
 710         }
 711
 712         if (nice(td->nice) == -1) {
 713                 td_verror(td, errno, "nice");
 714                 goto err;
 715         }
 716
 717         if (init_random_state(td))
 718                 goto err;
 719
 720         if (td->ioscheduler && switch_ioscheduler(td))
 721                 goto err;
 722
 723         td_set_runstate(td, TD_INITIALIZED);
 724         fio_sem_up(&startup_sem);
 725         fio_sem_down(&td->mutex);
 726
 727         if (!td->create_serialize && setup_files(td))
 728                 goto err;
 729         if (open_files(td))
 730                 goto err;
 731
 732         /*
 733          * Do this late, as some IO engines would like to have the
 734          * files setup prior to initializing structures.
 735          */
 736         if (td_io_init(td))
 737                 goto err;
 738
 739         if (td->exec_prerun) {
 740                 if (system(td->exec_prerun) < 0)
 741                         goto err;
 742         }
 743
 744         fio_gettime(&td->epoch, NULL);
 745         memcpy(&td->timeout_end, &td->epoch, sizeof(td->epoch));
 746         getrusage(RUSAGE_SELF, &td->ts.ru_start);
 747
 748         runtime[0] = runtime[1] = 0;
 749         while (td->loops--) {
 750                 fio_gettime(&td->start, NULL);
 751                 memcpy(&td->ts.stat_sample_time, &td->start, sizeof(td->start));
 752
 753                 if (td->ratemin)
 754                         memcpy(&td->lastrate, &td->ts.stat_sample_time, sizeof(td->lastrate));
 755
 756                 clear_io_state(td);
 757                 prune_io_piece_log(td);
 758
 759                 if (td->io_ops->flags & FIO_CPUIO)
 760                         do_cpuio(td);
 761                 else
 762                         do_io(td);
 763
 764                 if (td_read(td) && td->io_bytes[DDIR_READ])
 765                         runtime[DDIR_READ] += utime_since_now(&td->start);
 766                 if (td_write(td) && td->io_bytes[DDIR_WRITE])
 767                         runtime[DDIR_WRITE] += utime_since_now(&td->start);
 768
 769                 if (td->error || td->terminate)
 770                         break;
 771
 772                 if (td->verify == VERIFY_NONE)
 773                         continue;
 774
 775                 clear_io_state(td);
 776                 fio_gettime(&td->start, NULL);
 777
 778                 do_verify(td);
 779
 780                 runtime[DDIR_READ] += utime_since_now(&td->start);
 781
 782                 if (td->error || td->terminate)
 783                         break;
 784         }
 785
 786         update_rusage_stat(td);
 787         fio_gettime(&td->end_time, NULL);
 788         td->runtime[0] = runtime[0] / 1000;
 789         td->runtime[1] = runtime[1] / 1000;
 790
 791         if (td->ts.bw_log)
 792                 finish_log(td, td->ts.bw_log, "bw");
 793         if (td->ts.slat_log)
 794                 finish_log(td, td->ts.slat_log, "slat");
 795         if (td->ts.clat_log)
 796                 finish_log(td, td->ts.clat_log, "clat");
 797         if (td->write_iolog_file)
 798                 write_iolog_close(td);
 799         if (td->exec_postrun) {
 800                 if (system(td->exec_postrun) < 0)
 801                         log_err("fio: postrun %s failed\n", td->exec_postrun);
 802         }
 803
 804         if (exitall_on_terminate)
 805                 terminate_threads(td->groupid, 0);
 806
 807 err:
 808         if (td->error)
 809                 printf("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
 810         close_files(td);
 811         close_ioengine(td);
 812         cleanup_io_u(td);
 813         td_set_runstate(td, TD_EXITED);
 814         return (void *) (unsigned long) td->error;
 815 }
 816
 817 /*
 818  * We cannot pass the td data into a forked process, so attach the td and
 819  * pass it to the thread worker.
 820  */
 821 static int fork_main(int shmid, int offset)
 822 {
 823         struct thread_data *td;
 824         void *data, *ret;
 825
 826         data = shmat(shmid, NULL, 0);
 827         if (data == (void *) -1) {
 828                 int __err = errno;
 829
 830                 perror("shmat");
 831                 return __err;
 832         }
 833
 834         td = data + offset * sizeof(struct thread_data);
 835         ret = thread_main(td);
 836         shmdt(data);
 837         return (int) (unsigned long) ret;
 838 }
 839
 840 /*
 841  * Run over the job map and reap the threads that have exited, if any.
 842  */
 843 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
 844 {
 845         struct thread_data *td;
 846         int i, cputhreads, pending, status, ret;
 847
 848         /*
 849          * reap exited threads (TD_EXITED -> TD_REAPED)
 850          */
 851         pending = cputhreads = 0;
 852         for_each_td(td, i) {
 853                 int flags = 0;
 854
 855                 /*
 856                  * ->io_ops is NULL for a thread that has closed its
 857                  * io engine
 858                  */
 859                 if (td->io_ops && td->io_ops->flags & FIO_CPUIO)
 860                         cputhreads++;
 861
 862                 if (!td->pid || td->runstate == TD_REAPED)
 863                         continue;
 864                 if (td->use_thread) {
 865                         if (td->runstate == TD_EXITED) {
 866                                 td_set_runstate(td, TD_REAPED);
 867                                 goto reaped;
 868                         }
 869                         continue;
 870                 }
 871
 872                 flags = WNOHANG;
 873                 if (td->runstate == TD_EXITED)
 874                         flags = 0;
 875
 876                 /*
 877                  * check if someone quit or got killed in an unusual way
 878                  */
 879                 ret = waitpid(td->pid, &status, flags);
 880                 if (ret < 0) {
 881                         if (errno == ECHILD) {
 882                                 log_err("fio: pid=%d disappeared %d\n", td->pid, td->runstate);
 883                                 td_set_runstate(td, TD_REAPED);
 884                                 goto reaped;
 885                         }
 886                         perror("waitpid");
 887                 } else if (ret == td->pid) {
 888                         if (WIFSIGNALED(status)) {
 889                                 int sig = WTERMSIG(status);
 890
 891                                 log_err("fio: pid=%d, got signal=%d\n", td->pid, sig);
 892                                 td_set_runstate(td, TD_REAPED);
 893                                 goto reaped;
 894                         }
 895                         if (WIFEXITED(status)) {
 896                                 if (WEXITSTATUS(status) && !td->error)
 897                                         td->error = WEXITSTATUS(status);
 898
 899                                 td_set_runstate(td, TD_REAPED);
 900                                 goto reaped;
 901                         }
 902                 }
 903
 904                 /*
 905                  * thread is not dead, continue
 906                  */
 907                 continue;
 908 reaped:
 909                 if (td->use_thread) {
 910                         long ret;
 911
 912                         if (pthread_join(td->thread, (void *) &ret))
 913                                 perror("pthread_join");
 914                 }
 915
 916                 (*nr_running)--;
 917                 (*m_rate) -= td->ratemin;
 918                 (*t_rate) -= td->rate;
 919
 920                 if (td->error)
 921                         exit_value++;
 922         }
 923
 924         if (*nr_running == cputhreads && !pending)
 925                 terminate_threads(TERMINATE_ALL, 0);
 926 }
 927
 928 /*
 929  * Main function for kicking off and reaping jobs, as needed.
 930  */
 931 static void run_threads(void)
 932 {
 933         struct thread_data *td;
 934         unsigned long spent;
 935         int i, todo, nr_running, m_rate, t_rate, nr_started;
 936
 937         if (fio_pin_memory())
 938                 return;
 939
 940         if (!terse_output) {
 941                 printf("Starting %d thread%s\n", thread_number, thread_number > 1 ? "s" : "");
 942                 fflush(stdout);
 943         }
 944
 945         signal(SIGINT, sig_handler);
 946         signal(SIGALRM, sig_handler);
 947
 948         todo = thread_number;
 949         nr_running = 0;
 950         nr_started = 0;
 951         m_rate = t_rate = 0;
 952
 953         for_each_td(td, i) {
 954                 print_status_init(td->thread_number - 1);
 955
 956                 if (!td->create_serialize) {
 957                         init_disk_util(td);
 958                         continue;
 959                 }
 960
 961                 /*
 962                  * do file setup here so it happens sequentially,
 963                  * we don't want X number of threads getting their
 964                  * client data interspersed on disk
 965                  */
 966                 if (setup_files(td)) {
 967                         exit_value++;
 968                         if (td->error)
 969                                 log_err("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
 970                         td_set_runstate(td, TD_REAPED);
 971                         todo--;
 972                 }
 973
 974                 init_disk_util(td);
 975         }
 976
 977         set_genesis_time();
 978
 979         while (todo) {
 980                 struct thread_data *map[MAX_JOBS];
 981                 struct timeval this_start;
 982                 int this_jobs = 0, left;
 983
 984                 /*
 985                  * create threads (TD_NOT_CREATED -> TD_CREATED)
 986                  */
 987                 for_each_td(td, i) {
 988                         if (td->runstate != TD_NOT_CREATED)
 989                                 continue;
 990
 991                         /*
 992                          * never got a chance to start, killed by other
 993                          * thread for some reason
 994                          */
 995                         if (td->terminate) {
 996                                 todo--;
 997                                 continue;
 998                         }
 999
1000                         if (td->start_delay) {
1001                                 spent = mtime_since_genesis();
1002
1003                                 if (td->start_delay * 1000 > spent)
1004                                         continue;
1005                         }
1006
1007                         if (td->stonewall && (nr_started || nr_running))
1008                                 break;
1009
1010                         /*
1011                          * Set state to created. Thread will transition
1012                          * to TD_INITIALIZED when it's done setting up.
1013                          */
1014                         td_set_runstate(td, TD_CREATED);
1015                         map[this_jobs++] = td;
1016                         fio_sem_init(&startup_sem, 1);
1017                         nr_started++;
1018
1019                         if (td->use_thread) {
1020                                 if (pthread_create(&td->thread, NULL, thread_main, td)) {
1021                                         perror("thread_create");
1022                                         nr_started--;
1023                                 }
1024                         } else {
1025                                 if (fork())
1026                                         fio_sem_down(&startup_sem);
1027                                 else {
1028                                         int ret = fork_main(shm_id, i);
1029
1030                                         exit(ret);
1031                                 }
1032                         }
1033                 }
1034
1035                 /*
1036                  * Wait for the started threads to transition to
1037                  * TD_INITIALIZED.
1038                  */
1039                 fio_gettime(&this_start, NULL);
1040                 left = this_jobs;
1041                 while (left && !fio_abort) {
1042                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1043                                 break;
1044
1045                         usleep(100000);
1046
1047                         for (i = 0; i < this_jobs; i++) {
1048                                 td = map[i];
1049                                 if (!td)
1050                                         continue;
1051                                 if (td->runstate == TD_INITIALIZED) {
1052                                         map[i] = NULL;
1053                                         left--;
1054                                 } else if (td->runstate >= TD_EXITED) {
1055                                         map[i] = NULL;
1056                                         left--;
1057                                         todo--;
1058                                         nr_running++; /* work-around... */
1059                                 }
1060                         }
1061                 }
1062
1063                 if (left) {
1064                         log_err("fio: %d jobs failed to start\n", left);
1065                         for (i = 0; i < this_jobs; i++) {
1066                                 td = map[i];
1067                                 if (!td)
1068                                         continue;
1069                                 kill(td->pid, SIGTERM);
1070                         }
1071                         break;
1072                 }
1073
1074                 /*
1075                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1076                  */
1077                 for_each_td(td, i) {
1078                         if (td->runstate != TD_INITIALIZED)
1079                                 continue;
1080
1081                         td_set_runstate(td, TD_RUNNING);
1082                         nr_running++;
1083                         nr_started--;
1084                         m_rate += td->ratemin;
1085                         t_rate += td->rate;
1086                         todo--;
1087                         fio_sem_up(&td->mutex);
1088                 }
1089
1090                 reap_threads(&nr_running, &t_rate, &m_rate);
1091
1092                 if (todo)
1093                         usleep(100000);
1094         }
1095
1096         while (nr_running) {
1097                 reap_threads(&nr_running, &t_rate, &m_rate);
1098                 usleep(10000);
1099         }
1100
1101         update_io_ticks();
1102         fio_unpin_memory();
1103 }
1104
1105 int main(int argc, char *argv[])
1106 {
1107         long ps;
1108
1109         /*
1110          * We need locale for number printing, if it isn't set then just
1111          * go with the US format.
1112          */
1113         if (!getenv("LC_NUMERIC"))
1114                 setlocale(LC_NUMERIC, "en_US");
1115
1116         if (parse_options(argc, argv))
1117                 return 1;
1118
1119         if (!thread_number) {
1120                 log_err("Nothing to do\n");
1121                 return 1;
1122         }
1123
1124         ps = sysconf(_SC_PAGESIZE);
1125         if (ps < 0) {
1126                 log_err("Failed to get page size\n");
1127                 return 1;
1128         }
1129
1130         page_mask = ps - 1;
1131
1132         if (write_bw_log) {
1133                 setup_log(&agg_io_log[DDIR_READ]);
1134                 setup_log(&agg_io_log[DDIR_WRITE]);
1135         }
1136
1137         set_genesis_time();
1138
1139         disk_util_timer_arm();
1140
1141         run_threads();
1142
1143         if (!fio_abort) {
1144                 show_run_stats();
1145                 if (write_bw_log) {
1146                         __finish_log(agg_io_log[DDIR_READ],"agg-read_bw.log");
1147                         __finish_log(agg_io_log[DDIR_WRITE],"agg-write_bw.log");
1148                 }
1149         }
1150
1151         return exit_value;
1152 }