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 "hash.h"
  39 #include "smalloc.h"
  40 #include "verify.h"
  41 #include "diskutil.h"
  42
  43 unsigned long page_mask;
  44 unsigned long page_size;
  45 #define ALIGN(buf)      \
  46         (char *) (((unsigned long) (buf) + page_mask) & ~page_mask)
  47
  48 int groupid = 0;
  49 int thread_number = 0;
  50 int nr_process = 0;
  51 int nr_thread = 0;
  52 int shm_id = 0;
  53 int temp_stall_ts;
  54 unsigned long done_secs = 0;
  55
  56 static struct fio_mutex *startup_mutex;
  57 static struct fio_mutex *writeout_mutex;
  58 static volatile int fio_abort;
  59 static int exit_value;
  60 static struct itimerval itimer;
  61 static pthread_t gtod_thread;
  62
  63 struct io_log *agg_io_log[2];
  64
  65 #define TERMINATE_ALL           (-1)
  66 #define JOB_START_TIMEOUT       (5 * 1000)
  67
  68 void td_set_runstate(struct thread_data *td, int runstate)
  69 {
  70         if (td->runstate == runstate)
  71                 return;
  72
  73         dprint(FD_PROCESS, "pid=%d: runstate %d -> %d\n", (int) td->pid,
  74                                                 td->runstate, runstate);
  75         td->runstate = runstate;
  76 }
  77
  78 static void terminate_threads(int group_id)
  79 {
  80         struct thread_data *td;
  81         int i;
  82
  83         dprint(FD_PROCESS, "terminate group_id=%d\n", group_id);
  84
  85         for_each_td(td, i) {
  86                 if (group_id == TERMINATE_ALL || groupid == td->groupid) {
  87                         dprint(FD_PROCESS, "setting terminate on %s/%d\n",
  88                                                 td->o.name, (int) td->pid);
  89                         td->terminate = 1;
  90                         td->o.start_delay = 0;
  91
  92                         /*
  93                          * if the thread is running, just let it exit
  94                          */
  95                         if (td->runstate < TD_RUNNING)
  96                                 kill(td->pid, SIGQUIT);
  97                         else {
  98                                 struct ioengine_ops *ops = td->io_ops;
  99
 100                                 if (ops && (ops->flags & FIO_SIGQUIT))
 101                                         kill(td->pid, SIGQUIT);
 102                         }
 103                 }
 104         }
 105 }
 106
 107 static void status_timer_arm(void)
 108 {
 109         itimer.it_value.tv_sec = 0;
 110         itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
 111         setitimer(ITIMER_REAL, &itimer, NULL);
 112 }
 113
 114 static void sig_alrm(int fio_unused sig)
 115 {
 116         if (threads) {
 117                 update_io_ticks();
 118                 print_thread_status();
 119                 status_timer_arm();
 120         }
 121 }
 122
 123 /*
 124  * Happens on thread runs with ctrl-c, ignore our own SIGQUIT
 125  */
 126 static void sig_quit(int sig)
 127 {
 128 }
 129
 130 static void sig_int(int sig)
 131 {
 132         if (threads) {
 133                 printf("\nfio: terminating on signal %d\n", sig);
 134                 fflush(stdout);
 135                 terminate_threads(TERMINATE_ALL);
 136         }
 137 }
 138
 139 static void sig_ill(int fio_unused sig)
 140 {
 141         if (!threads)
 142                 return;
 143
 144         log_err("fio: illegal instruction. your cpu does not support "
 145                 "the sse4.2 instruction for crc32c\n");
 146         terminate_threads(TERMINATE_ALL);
 147         exit(4);
 148 }
 149
 150 static void set_sig_handlers(void)
 151 {
 152         struct sigaction act;
 153
 154         memset(&act, 0, sizeof(act));
 155         act.sa_handler = sig_alrm;
 156         act.sa_flags = SA_RESTART;
 157         sigaction(SIGALRM, &act, NULL);
 158
 159         memset(&act, 0, sizeof(act));
 160         act.sa_handler = sig_int;
 161         act.sa_flags = SA_RESTART;
 162         sigaction(SIGINT, &act, NULL);
 163
 164         memset(&act, 0, sizeof(act));
 165         act.sa_handler = sig_ill;
 166         act.sa_flags = SA_RESTART;
 167         sigaction(SIGILL, &act, NULL);
 168
 169         memset(&act, 0, sizeof(act));
 170         act.sa_handler = sig_quit;
 171         act.sa_flags = SA_RESTART;
 172         sigaction(SIGQUIT, &act, NULL);
 173 }
 174
 175 static inline int should_check_rate(struct thread_data *td)
 176 {
 177         struct thread_options *o = &td->o;
 178
 179         /*
 180          * If some rate setting was given, we need to check it
 181          */
 182         if (o->rate || o->ratemin || o->rate_iops || o->rate_iops_min)
 183                 return 1;
 184
 185         return 0;
 186 }
 187
 188 /*
 189  * Check if we are above the minimum rate given.
 190  */
 191 static int check_min_rate(struct thread_data *td, struct timeval *now)
 192 {
 193         unsigned long long bytes = 0;
 194         unsigned long iops = 0;
 195         unsigned long spent;
 196         unsigned long rate;
 197
 198         /*
 199          * allow a 2 second settle period in the beginning
 200          */
 201         if (mtime_since(&td->start, now) < 2000)
 202                 return 0;
 203
 204         if (td_read(td)) {
 205                 iops += td->io_blocks[DDIR_READ];
 206                 bytes += td->this_io_bytes[DDIR_READ];
 207         }
 208         if (td_write(td)) {
 209                 iops += td->io_blocks[DDIR_WRITE];
 210                 bytes += td->this_io_bytes[DDIR_WRITE];
 211         }
 212
 213         /*
 214          * if rate blocks is set, sample is running
 215          */
 216         if (td->rate_bytes || td->rate_blocks) {
 217                 spent = mtime_since(&td->lastrate, now);
 218                 if (spent < td->o.ratecycle)
 219                         return 0;
 220
 221                 if (td->o.rate) {
 222                         /*
 223                          * check bandwidth specified rate
 224                          */
 225                         if (bytes < td->rate_bytes) {
 226                                 log_err("%s: min rate %u not met\n", td->o.name,
 227                                                                 td->o.ratemin);
 228                                 return 1;
 229                         } else {
 230                                 rate = (bytes - td->rate_bytes) / spent;
 231                                 if (rate < td->o.ratemin ||
 232                                     bytes < td->rate_bytes) {
 233                                         log_err("%s: min rate %u not met, got"
 234                                                 " %luKiB/sec\n", td->o.name,
 235                                                         td->o.ratemin, rate);
 236                                         return 1;
 237                                 }
 238                         }
 239                 } else {
 240                         /*
 241                          * checks iops specified rate
 242                          */
 243                         if (iops < td->o.rate_iops) {
 244                                 log_err("%s: min iops rate %u not met\n",
 245                                                 td->o.name, td->o.rate_iops);
 246                                 return 1;
 247                         } else {
 248                                 rate = (iops - td->rate_blocks) / spent;
 249                                 if (rate < td->o.rate_iops_min ||
 250                                     iops < td->rate_blocks) {
 251                                         log_err("%s: min iops rate %u not met,"
 252                                                 " got %lu\n", td->o.name,
 253                                                         td->o.rate_iops_min,
 254                                                         rate);
 255                                 }
 256                         }
 257                 }
 258         }
 259
 260         td->rate_bytes = bytes;
 261         td->rate_blocks = iops;
 262         memcpy(&td->lastrate, now, sizeof(*now));
 263         return 0;
 264 }
 265
 266 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
 267 {
 268         if (!td->o.timeout)
 269                 return 0;
 270         if (mtime_since(&td->epoch, t) >= td->o.timeout * 1000)
 271                 return 1;
 272
 273         return 0;
 274 }
 275
 276 /*
 277  * When job exits, we can cancel the in-flight IO if we are using async
 278  * io. Attempt to do so.
 279  */
 280 static void cleanup_pending_aio(struct thread_data *td)
 281 {
 282         struct flist_head *entry, *n;
 283         struct io_u *io_u;
 284         int r;
 285
 286         /*
 287          * get immediately available events, if any
 288          */
 289         r = io_u_queued_complete(td, 0);
 290         if (r < 0)
 291                 return;
 292
 293         /*
 294          * now cancel remaining active events
 295          */
 296         if (td->io_ops->cancel) {
 297                 flist_for_each_safe(entry, n, &td->io_u_busylist) {
 298                         io_u = flist_entry(entry, struct io_u, list);
 299
 300                         /*
 301                          * if the io_u isn't in flight, then that generally
 302                          * means someone leaked an io_u. complain but fix
 303                          * it up, so we don't stall here.
 304                          */
 305                         if ((io_u->flags & IO_U_F_FLIGHT) == 0) {
 306                                 log_err("fio: non-busy IO on busy list\n");
 307                                 put_io_u(td, io_u);
 308                         } else {
 309                                 r = td->io_ops->cancel(td, io_u);
 310                                 if (!r)
 311                                         put_io_u(td, io_u);
 312                         }
 313                 }
 314         }
 315
 316         if (td->cur_depth)
 317                 r = io_u_queued_complete(td, td->cur_depth);
 318 }
 319
 320 /*
 321  * Helper to handle the final sync of a file. Works just like the normal
 322  * io path, just does everything sync.
 323  */
 324 static int fio_io_sync(struct thread_data *td, struct fio_file *f)
 325 {
 326         struct io_u *io_u = __get_io_u(td);
 327         int ret;
 328
 329         if (!io_u)
 330                 return 1;
 331
 332         io_u->ddir = DDIR_SYNC;
 333         io_u->file = f;
 334
 335         if (td_io_prep(td, io_u)) {
 336                 put_io_u(td, io_u);
 337                 return 1;
 338         }
 339
 340 requeue:
 341         ret = td_io_queue(td, io_u);
 342         if (ret < 0) {
 343                 td_verror(td, io_u->error, "td_io_queue");
 344                 put_io_u(td, io_u);
 345                 return 1;
 346         } else if (ret == FIO_Q_QUEUED) {
 347                 if (io_u_queued_complete(td, 1) < 0)
 348                         return 1;
 349         } else if (ret == FIO_Q_COMPLETED) {
 350                 if (io_u->error) {
 351                         td_verror(td, io_u->error, "td_io_queue");
 352                         return 1;
 353                 }
 354
 355                 if (io_u_sync_complete(td, io_u) < 0)
 356                         return 1;
 357         } else if (ret == FIO_Q_BUSY) {
 358                 if (td_io_commit(td))
 359                         return 1;
 360                 goto requeue;
 361         }
 362
 363         return 0;
 364 }
 365
 366 static inline void update_tv_cache(struct thread_data *td)
 367 {
 368         if ((++td->tv_cache_nr & td->tv_cache_mask) == td->tv_cache_mask)
 369                 fio_gettime(&td->tv_cache, NULL);
 370 }
 371
 372 /*
 373  * The main verify engine. Runs over the writes we previously submitted,
 374  * reads the blocks back in, and checks the crc/md5 of the data.
 375  */
 376 static void do_verify(struct thread_data *td)
 377 {
 378         struct fio_file *f;
 379         struct io_u *io_u;
 380         int ret, min_events;
 381         unsigned int i;
 382
 383         /*
 384          * sync io first and invalidate cache, to make sure we really
 385          * read from disk.
 386          */
 387         for_each_file(td, f, i) {
 388                 if (!fio_file_open(f))
 389                         continue;
 390                 if (fio_io_sync(td, f))
 391                         break;
 392                 if (file_invalidate_cache(td, f))
 393                         break;
 394         }
 395
 396         if (td->error)
 397                 return;
 398
 399         td_set_runstate(td, TD_VERIFYING);
 400
 401         io_u = NULL;
 402         while (!td->terminate) {
 403                 int ret2, full;
 404
 405                 io_u = __get_io_u(td);
 406                 if (!io_u)
 407                         break;
 408
 409                 update_tv_cache(td);
 410
 411                 if (runtime_exceeded(td, &td->tv_cache)) {
 412                         put_io_u(td, io_u);
 413                         td->terminate = 1;
 414                         break;
 415                 }
 416
 417                 if (get_next_verify(td, io_u)) {
 418                         put_io_u(td, io_u);
 419                         break;
 420                 }
 421
 422                 if (td_io_prep(td, io_u)) {
 423                         put_io_u(td, io_u);
 424                         break;
 425                 }
 426
 427                 io_u->end_io = verify_io_u;
 428
 429                 ret = td_io_queue(td, io_u);
 430                 switch (ret) {
 431                 case FIO_Q_COMPLETED:
 432                         if (io_u->error)
 433                                 ret = -io_u->error;
 434                         else if (io_u->resid) {
 435                                 int bytes = io_u->xfer_buflen - io_u->resid;
 436                                 struct fio_file *f = io_u->file;
 437
 438                                 /*
 439                                  * zero read, fail
 440                                  */
 441                                 if (!bytes) {
 442                                         td_verror(td, EIO, "full resid");
 443                                         put_io_u(td, io_u);
 444                                         break;
 445                                 }
 446
 447                                 io_u->xfer_buflen = io_u->resid;
 448                                 io_u->xfer_buf += bytes;
 449                                 io_u->offset += bytes;
 450
 451                                 td->ts.short_io_u[io_u->ddir]++;
 452
 453                                 if (io_u->offset == f->real_file_size)
 454                                         goto sync_done;
 455
 456                                 requeue_io_u(td, &io_u);
 457                         } else {
 458 sync_done:
 459                                 ret = io_u_sync_complete(td, io_u);
 460                                 if (ret < 0)
 461                                         break;
 462                         }
 463                         continue;
 464                 case FIO_Q_QUEUED:
 465                         break;
 466                 case FIO_Q_BUSY:
 467                         requeue_io_u(td, &io_u);
 468                         ret2 = td_io_commit(td);
 469                         if (ret2 < 0)
 470                                 ret = ret2;
 471                         break;
 472                 default:
 473                         assert(ret < 0);
 474                         td_verror(td, -ret, "td_io_queue");
 475                         break;
 476                 }
 477
 478                 if (ret < 0 || td->error)
 479                         break;
 480
 481                 /*
 482                  * if we can queue more, do so. but check if there are
 483                  * completed io_u's first.
 484                  */
 485                 full = queue_full(td) || ret == FIO_Q_BUSY;
 486                 if (full || !td->o.iodepth_batch_complete) {
 487                         min_events = td->o.iodepth_batch_complete;
 488                         if (full && !min_events)
 489                                 min_events = 1;
 490
 491                         do {
 492                                 /*
 493                                  * Reap required number of io units, if any,
 494                                  * and do the verification on them through
 495                                  * the callback handler
 496                                  */
 497                                 if (io_u_queued_complete(td, min_events) < 0) {
 498                                         ret = -1;
 499                                         break;
 500                                 }
 501                         } while (full && (td->cur_depth > td->o.iodepth_low));
 502                 }
 503                 if (ret < 0)
 504                         break;
 505         }
 506
 507         if (!td->error) {
 508                 min_events = td->cur_depth;
 509
 510                 if (min_events)
 511                         ret = io_u_queued_complete(td, min_events);
 512         } else
 513                 cleanup_pending_aio(td);
 514
 515         td_set_runstate(td, TD_RUNNING);
 516 }
 517
 518 /*
 519  * Main IO worker function. It retrieves io_u's to process and queues
 520  * and reaps them, checking for rate and errors along the way.
 521  */
 522 static void do_io(struct thread_data *td)
 523 {
 524         unsigned long usec;
 525         unsigned int i;
 526         int ret = 0;
 527
 528         if (in_ramp_time(td))
 529                 td_set_runstate(td, TD_RAMP);
 530         else
 531                 td_set_runstate(td, TD_RUNNING);
 532
 533         while ((td->this_io_bytes[0] + td->this_io_bytes[1]) < td->o.size) {
 534                 struct timeval comp_time;
 535                 long bytes_done = 0;
 536                 int min_evts = 0;
 537                 struct io_u *io_u;
 538                 int ret2, full;
 539
 540                 if (td->terminate)
 541                         break;
 542
 543                 io_u = get_io_u(td);
 544                 if (!io_u)
 545                         break;
 546
 547                 update_tv_cache(td);
 548
 549                 if (runtime_exceeded(td, &td->tv_cache)) {
 550                         put_io_u(td, io_u);
 551                         td->terminate = 1;
 552                         break;
 553                 }
 554
 555                 /*
 556                  * Add verification end_io handler, if asked to verify
 557                  * a previously written file.
 558                  */
 559                 if (td->o.verify != VERIFY_NONE && io_u->ddir == DDIR_READ) {
 560                         io_u->end_io = verify_io_u;
 561                         td_set_runstate(td, TD_VERIFYING);
 562                 } else if (in_ramp_time(td))
 563                         td_set_runstate(td, TD_RAMP);
 564                 else
 565                         td_set_runstate(td, TD_RUNNING);
 566
 567                 ret = td_io_queue(td, io_u);
 568                 switch (ret) {
 569                 case FIO_Q_COMPLETED:
 570                         if (io_u->error)
 571                                 ret = -io_u->error;
 572                         else if (io_u->resid) {
 573                                 int bytes = io_u->xfer_buflen - io_u->resid;
 574                                 struct fio_file *f = io_u->file;
 575
 576                                 /*
 577                                  * zero read, fail
 578                                  */
 579                                 if (!bytes) {
 580                                         td_verror(td, EIO, "full resid");
 581                                         put_io_u(td, io_u);
 582                                         break;
 583                                 }
 584
 585                                 io_u->xfer_buflen = io_u->resid;
 586                                 io_u->xfer_buf += bytes;
 587                                 io_u->offset += bytes;
 588
 589                                 td->ts.short_io_u[io_u->ddir]++;
 590
 591                                 if (io_u->offset == f->real_file_size)
 592                                         goto sync_done;
 593
 594                                 requeue_io_u(td, &io_u);
 595                         } else {
 596 sync_done:
 597                                 if (should_check_rate(td))
 598                                         fio_gettime(&comp_time, NULL);
 599
 600                                 bytes_done = io_u_sync_complete(td, io_u);
 601                                 if (bytes_done < 0)
 602                                         ret = bytes_done;
 603                         }
 604                         break;
 605                 case FIO_Q_QUEUED:
 606                         /*
 607                          * if the engine doesn't have a commit hook,
 608                          * the io_u is really queued. if it does have such
 609                          * a hook, it has to call io_u_queued() itself.
 610                          */
 611                         if (td->io_ops->commit == NULL)
 612                                 io_u_queued(td, io_u);
 613                         break;
 614                 case FIO_Q_BUSY:
 615                         requeue_io_u(td, &io_u);
 616                         ret2 = td_io_commit(td);
 617                         if (ret2 < 0)
 618                                 ret = ret2;
 619                         break;
 620                 default:
 621                         assert(ret < 0);
 622                         put_io_u(td, io_u);
 623                         break;
 624                 }
 625
 626                 if (ret < 0 || td->error)
 627                         break;
 628
 629                 /*
 630                  * See if we need to complete some commands
 631                  */
 632                 full = queue_full(td) || ret == FIO_Q_BUSY;
 633                 if (full || !td->o.iodepth_batch_complete) {
 634                         min_evts = td->o.iodepth_batch_complete;
 635                         if (full && !min_evts)
 636                                 min_evts = 1;
 637
 638                         if (should_check_rate(td))
 639                                 fio_gettime(&comp_time, NULL);
 640
 641                         do {
 642                                 ret = io_u_queued_complete(td, min_evts);
 643                                 if (ret <= 0)
 644                                         break;
 645
 646                                 bytes_done += ret;
 647                         } while (full && (td->cur_depth > td->o.iodepth_low));
 648                 }
 649
 650                 if (ret < 0)
 651                         break;
 652                 if (!bytes_done)
 653                         continue;
 654
 655                 /*
 656                  * the rate is batched for now, it should work for batches
 657                  * of completions except the very first one which may look
 658                  * a little bursty
 659                  */
 660                 if (!in_ramp_time(td) && should_check_rate(td)) {
 661                         usec = utime_since(&td->tv_cache, &comp_time);
 662
 663                         rate_throttle(td, usec, bytes_done);
 664
 665                         if (check_min_rate(td, &comp_time)) {
 666                                 if (exitall_on_terminate)
 667                                         terminate_threads(td->groupid);
 668                                 td_verror(td, EIO, "check_min_rate");
 669                                 break;
 670                         }
 671                 }
 672
 673                 if (td->o.thinktime) {
 674                         unsigned long long b;
 675
 676                         b = td->io_blocks[0] + td->io_blocks[1];
 677                         if (!(b % td->o.thinktime_blocks)) {
 678                                 int left;
 679
 680                                 if (td->o.thinktime_spin)
 681                                         usec_spin(td->o.thinktime_spin);
 682
 683                                 left = td->o.thinktime - td->o.thinktime_spin;
 684                                 if (left)
 685                                         usec_sleep(td, left);
 686                         }
 687                 }
 688         }
 689
 690         if (td->o.fill_device && td->error == ENOSPC) {
 691                 td->error = 0;
 692                 td->terminate = 1;
 693         }
 694         if (!td->error) {
 695                 struct fio_file *f;
 696
 697                 i = td->cur_depth;
 698                 if (i)
 699                         ret = io_u_queued_complete(td, i);
 700
 701                 if (should_fsync(td) && td->o.end_fsync) {
 702                         td_set_runstate(td, TD_FSYNCING);
 703
 704                         for_each_file(td, f, i) {
 705                                 if (!fio_file_open(f))
 706                                         continue;
 707                                 fio_io_sync(td, f);
 708                         }
 709                 }
 710         } else
 711                 cleanup_pending_aio(td);
 712
 713         /*
 714          * stop job if we failed doing any IO
 715          */
 716         if ((td->this_io_bytes[0] + td->this_io_bytes[1]) == 0)
 717                 td->done = 1;
 718 }
 719
 720 static void cleanup_io_u(struct thread_data *td)
 721 {
 722         struct flist_head *entry, *n;
 723         struct io_u *io_u;
 724
 725         flist_for_each_safe(entry, n, &td->io_u_freelist) {
 726                 io_u = flist_entry(entry, struct io_u, list);
 727
 728                 flist_del(&io_u->list);
 729                 free(io_u);
 730         }
 731
 732         free_io_mem(td);
 733 }
 734
 735 static int init_io_u(struct thread_data *td)
 736 {
 737         struct io_u *io_u;
 738         unsigned int max_bs;
 739         int cl_align, i, max_units;
 740         char *p;
 741
 742         max_units = td->o.iodepth;
 743         max_bs = max(td->o.max_bs[DDIR_READ], td->o.max_bs[DDIR_WRITE]);
 744         td->orig_buffer_size = (unsigned long long) max_bs
 745                                         * (unsigned long long) max_units;
 746
 747         if (td->o.mem_type == MEM_SHMHUGE || td->o.mem_type == MEM_MMAPHUGE) {
 748                 unsigned long bs;
 749
 750                 bs = td->orig_buffer_size + td->o.hugepage_size - 1;
 751                 td->orig_buffer_size = bs & ~(td->o.hugepage_size - 1);
 752         }
 753
 754         if (td->orig_buffer_size != (size_t) td->orig_buffer_size) {
 755                 log_err("fio: IO memory too large. Reduce max_bs or iodepth\n");
 756                 return 1;
 757         }
 758
 759         if (allocate_io_mem(td))
 760                 return 1;
 761
 762         if (td->o.odirect)
 763                 p = ALIGN(td->orig_buffer);
 764         else
 765                 p = td->orig_buffer;
 766
 767         cl_align = os_cache_line_size();
 768
 769         for (i = 0; i < max_units; i++) {
 770                 void *ptr;
 771
 772                 if (td->terminate)
 773                         return 1;
 774
 775                 if (posix_memalign(&ptr, cl_align, sizeof(*io_u))) {
 776                         log_err("fio: posix_memalign=%s\n", strerror(errno));
 777                         break;
 778                 }
 779
 780                 io_u = ptr;
 781                 memset(io_u, 0, sizeof(*io_u));
 782                 INIT_FLIST_HEAD(&io_u->list);
 783
 784                 if (!(td->io_ops->flags & FIO_NOIO)) {
 785                         io_u->buf = p + max_bs * i;
 786
 787                         if (td_write(td) && !td->o.refill_buffers)
 788                                 io_u_fill_buffer(td, io_u, max_bs);
 789                 }
 790
 791                 io_u->index = i;
 792                 io_u->flags = IO_U_F_FREE;
 793                 flist_add(&io_u->list, &td->io_u_freelist);
 794         }
 795
 796         return 0;
 797 }
 798
 799 static int switch_ioscheduler(struct thread_data *td)
 800 {
 801         char tmp[256], tmp2[128];
 802         FILE *f;
 803         int ret;
 804
 805         if (td->io_ops->flags & FIO_DISKLESSIO)
 806                 return 0;
 807
 808         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
 809
 810         f = fopen(tmp, "r+");
 811         if (!f) {
 812                 if (errno == ENOENT) {
 813                         log_err("fio: os or kernel doesn't support IO scheduler"
 814                                 " switching\n");
 815                         return 0;
 816                 }
 817                 td_verror(td, errno, "fopen iosched");
 818                 return 1;
 819         }
 820
 821         /*
 822          * Set io scheduler.
 823          */
 824         ret = fwrite(td->o.ioscheduler, strlen(td->o.ioscheduler), 1, f);
 825         if (ferror(f) || ret != 1) {
 826                 td_verror(td, errno, "fwrite");
 827                 fclose(f);
 828                 return 1;
 829         }
 830
 831         rewind(f);
 832
 833         /*
 834          * Read back and check that the selected scheduler is now the default.
 835          */
 836         ret = fread(tmp, 1, sizeof(tmp), f);
 837         if (ferror(f) || ret < 0) {
 838                 td_verror(td, errno, "fread");
 839                 fclose(f);
 840                 return 1;
 841         }
 842
 843         sprintf(tmp2, "[%s]", td->o.ioscheduler);
 844         if (!strstr(tmp, tmp2)) {
 845                 log_err("fio: io scheduler %s not found\n", td->o.ioscheduler);
 846                 td_verror(td, EINVAL, "iosched_switch");
 847                 fclose(f);
 848                 return 1;
 849         }
 850
 851         fclose(f);
 852         return 0;
 853 }
 854
 855 static int keep_running(struct thread_data *td)
 856 {
 857         unsigned long long io_done;
 858
 859         if (td->done)
 860                 return 0;
 861         if (td->o.time_based)
 862                 return 1;
 863         if (td->o.loops) {
 864                 td->o.loops--;
 865                 return 1;
 866         }
 867
 868         io_done = td->io_bytes[DDIR_READ] + td->io_bytes[DDIR_WRITE]
 869                         + td->io_skip_bytes;
 870         if (io_done < td->o.size)
 871                 return 1;
 872
 873         return 0;
 874 }
 875
 876 static void reset_io_counters(struct thread_data *td)
 877 {
 878         td->ts.stat_io_bytes[0] = td->ts.stat_io_bytes[1] = 0;
 879         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
 880         td->zone_bytes = 0;
 881         td->rate_bytes = 0;
 882         td->rate_blocks = 0;
 883
 884         td->last_was_sync = 0;
 885
 886         /*
 887          * reset file done count if we are to start over
 888          */
 889         if (td->o.time_based || td->o.loops)
 890                 td->nr_done_files = 0;
 891
 892         /*
 893          * Set the same seed to get repeatable runs
 894          */
 895         td_fill_rand_seeds(td);
 896 }
 897
 898 void reset_all_stats(struct thread_data *td)
 899 {
 900         struct timeval tv;
 901         int i;
 902
 903         reset_io_counters(td);
 904
 905         for (i = 0; i < 2; i++) {
 906                 td->io_bytes[i] = 0;
 907                 td->io_blocks[i] = 0;
 908                 td->io_issues[i] = 0;
 909                 td->ts.total_io_u[i] = 0;
 910         }
 911
 912         fio_gettime(&tv, NULL);
 913         memcpy(&td->epoch, &tv, sizeof(tv));
 914         memcpy(&td->start, &tv, sizeof(tv));
 915 }
 916
 917 static void clear_io_state(struct thread_data *td)
 918 {
 919         struct fio_file *f;
 920         unsigned int i;
 921
 922         reset_io_counters(td);
 923
 924         close_files(td);
 925         for_each_file(td, f, i)
 926                 fio_file_clear_done(f);
 927 }
 928
 929 static int exec_string(const char *string)
 930 {
 931         int ret, newlen = strlen(string) + 1 + 8;
 932         char *str;
 933
 934         str = malloc(newlen);
 935         sprintf(str, "sh -c %s", string);
 936
 937         ret = system(str);
 938         if (ret == -1)
 939                 log_err("fio: exec of cmd <%s> failed\n", str);
 940
 941         free(str);
 942         return ret;
 943 }
 944
 945 /*
 946  * Entry point for the thread based jobs. The process based jobs end up
 947  * here as well, after a little setup.
 948  */
 949 static void *thread_main(void *data)
 950 {
 951         unsigned long long runtime[2], elapsed;
 952         struct thread_data *td = data;
 953         int clear_state;
 954
 955         if (!td->o.use_thread)
 956                 setsid();
 957
 958         td->pid = getpid();
 959
 960         dprint(FD_PROCESS, "jobs pid=%d started\n", (int) td->pid);
 961
 962         INIT_FLIST_HEAD(&td->io_u_freelist);
 963         INIT_FLIST_HEAD(&td->io_u_busylist);
 964         INIT_FLIST_HEAD(&td->io_u_requeues);
 965         INIT_FLIST_HEAD(&td->io_log_list);
 966         INIT_FLIST_HEAD(&td->io_hist_list);
 967         td->io_hist_tree = RB_ROOT;
 968
 969         td_set_runstate(td, TD_INITIALIZED);
 970         dprint(FD_MUTEX, "up startup_mutex\n");
 971         fio_mutex_up(startup_mutex);
 972         dprint(FD_MUTEX, "wait on td->mutex\n");
 973         fio_mutex_down(td->mutex);
 974         dprint(FD_MUTEX, "done waiting on td->mutex\n");
 975
 976         /*
 977          * the ->mutex mutex is now no longer used, close it to avoid
 978          * eating a file descriptor
 979          */
 980         fio_mutex_remove(td->mutex);
 981
 982         /*
 983          * May alter parameters that init_io_u() will use, so we need to
 984          * do this first.
 985          */
 986         if (init_iolog(td))
 987                 goto err;
 988
 989         if (init_io_u(td))
 990                 goto err;
 991
 992         if (td->o.cpumask_set && fio_setaffinity(td) == -1) {
 993                 td_verror(td, errno, "cpu_set_affinity");
 994                 goto err;
 995         }
 996
 997         /*
 998          * If we have a gettimeofday() thread, make sure we exclude that
 999          * thread from this job
1000          */
1001         if (td->o.gtod_cpu) {
1002                 fio_cpu_clear(&td->o.cpumask, td->o.gtod_cpu);
1003                 if (fio_setaffinity(td) == -1) {
1004                         td_verror(td, errno, "cpu_set_affinity");
1005                         goto err;
1006                 }
1007         }
1008
1009         if (td->ioprio_set) {
1010                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
1011                         td_verror(td, errno, "ioprio_set");
1012                         goto err;
1013                 }
1014         }
1015
1016         if (nice(td->o.nice) == -1) {
1017                 td_verror(td, errno, "nice");
1018                 goto err;
1019         }
1020
1021         if (td->o.ioscheduler && switch_ioscheduler(td))
1022                 goto err;
1023
1024         if (!td->o.create_serialize && setup_files(td))
1025                 goto err;
1026
1027         if (td_io_init(td))
1028                 goto err;
1029
1030         if (init_random_map(td))
1031                 goto err;
1032
1033         if (td->o.exec_prerun) {
1034                 if (exec_string(td->o.exec_prerun))
1035                         goto err;
1036         }
1037
1038         if (td->o.pre_read) {
1039                 if (pre_read_files(td) < 0)
1040                         goto err;
1041         }
1042
1043         fio_gettime(&td->epoch, NULL);
1044         getrusage(RUSAGE_SELF, &td->ts.ru_start);
1045
1046         runtime[0] = runtime[1] = 0;
1047         clear_state = 0;
1048         while (keep_running(td)) {
1049                 fio_gettime(&td->start, NULL);
1050                 memcpy(&td->ts.stat_sample_time, &td->start, sizeof(td->start));
1051                 memcpy(&td->tv_cache, &td->start, sizeof(td->start));
1052
1053                 if (td->o.ratemin)
1054                         memcpy(&td->lastrate, &td->ts.stat_sample_time,
1055                                                         sizeof(td->lastrate));
1056
1057                 if (clear_state)
1058                         clear_io_state(td);
1059
1060                 prune_io_piece_log(td);
1061
1062                 do_io(td);
1063
1064                 clear_state = 1;
1065
1066                 if (td_read(td) && td->io_bytes[DDIR_READ]) {
1067                         elapsed = utime_since_now(&td->start);
1068                         runtime[DDIR_READ] += elapsed;
1069                 }
1070                 if (td_write(td) && td->io_bytes[DDIR_WRITE]) {
1071                         elapsed = utime_since_now(&td->start);
1072                         runtime[DDIR_WRITE] += elapsed;
1073                 }
1074
1075                 if (td->error || td->terminate)
1076                         break;
1077
1078                 if (!td->o.do_verify ||
1079                     td->o.verify == VERIFY_NONE ||
1080                     (td->io_ops->flags & FIO_UNIDIR))
1081                         continue;
1082
1083                 clear_io_state(td);
1084
1085                 fio_gettime(&td->start, NULL);
1086
1087                 do_verify(td);
1088
1089                 runtime[DDIR_READ] += utime_since_now(&td->start);
1090
1091                 if (td->error || td->terminate)
1092                         break;
1093         }
1094
1095         update_rusage_stat(td);
1096         td->ts.runtime[0] = (runtime[0] + 999) / 1000;
1097         td->ts.runtime[1] = (runtime[1] + 999) / 1000;
1098         td->ts.total_run_time = mtime_since_now(&td->epoch);
1099         td->ts.io_bytes[0] = td->io_bytes[0];
1100         td->ts.io_bytes[1] = td->io_bytes[1];
1101
1102         fio_mutex_down(writeout_mutex);
1103         if (td->ts.bw_log) {
1104                 if (td->o.bw_log_file) {
1105                         finish_log_named(td, td->ts.bw_log,
1106                                                 td->o.bw_log_file, "bw");
1107                 } else
1108                         finish_log(td, td->ts.bw_log, "bw");
1109         }
1110         if (td->ts.slat_log) {
1111                 if (td->o.lat_log_file) {
1112                         finish_log_named(td, td->ts.slat_log,
1113                                                 td->o.lat_log_file, "slat");
1114                 } else
1115                         finish_log(td, td->ts.slat_log, "slat");
1116         }
1117         if (td->ts.clat_log) {
1118                 if (td->o.lat_log_file) {
1119                         finish_log_named(td, td->ts.clat_log,
1120                                                 td->o.lat_log_file, "clat");
1121                 } else
1122                         finish_log(td, td->ts.clat_log, "clat");
1123         }
1124         fio_mutex_up(writeout_mutex);
1125         if (td->o.exec_postrun)
1126                 exec_string(td->o.exec_postrun);
1127
1128         if (exitall_on_terminate)
1129                 terminate_threads(td->groupid);
1130
1131 err:
1132         if (td->error)
1133                 printf("fio: pid=%d, err=%d/%s\n", (int) td->pid, td->error,
1134                                                         td->verror);
1135         close_and_free_files(td);
1136         close_ioengine(td);
1137         cleanup_io_u(td);
1138
1139         if (td->o.cpumask_set) {
1140                 int ret = fio_cpuset_exit(&td->o.cpumask);
1141
1142                 td_verror(td, ret, "fio_cpuset_exit");
1143         }
1144
1145         /*
1146          * do this very late, it will log file closing as well
1147          */
1148         if (td->o.write_iolog_file)
1149                 write_iolog_close(td);
1150
1151         options_mem_free(td);
1152         td_set_runstate(td, TD_EXITED);
1153         return (void *) (unsigned long) td->error;
1154 }
1155
1156 /*
1157  * We cannot pass the td data into a forked process, so attach the td and
1158  * pass it to the thread worker.
1159  */
1160 static int fork_main(int shmid, int offset)
1161 {
1162         struct thread_data *td;
1163         void *data, *ret;
1164
1165         data = shmat(shmid, NULL, 0);
1166         if (data == (void *) -1) {
1167                 int __err = errno;
1168
1169                 perror("shmat");
1170                 return __err;
1171         }
1172
1173         td = data + offset * sizeof(struct thread_data);
1174         ret = thread_main(td);
1175         shmdt(data);
1176         return (int) (unsigned long) ret;
1177 }
1178
1179 /*
1180  * Run over the job map and reap the threads that have exited, if any.
1181  */
1182 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
1183 {
1184         struct thread_data *td;
1185         int i, cputhreads, realthreads, pending, status, ret;
1186
1187         /*
1188          * reap exited threads (TD_EXITED -> TD_REAPED)
1189          */
1190         realthreads = pending = cputhreads = 0;
1191         for_each_td(td, i) {
1192                 int flags = 0;
1193
1194                 /*
1195                  * ->io_ops is NULL for a thread that has closed its
1196                  * io engine
1197                  */
1198                 if (td->io_ops && !strcmp(td->io_ops->name, "cpuio"))
1199                         cputhreads++;
1200                 else
1201                         realthreads++;
1202
1203                 if (!td->pid) {
1204                         pending++;
1205                         continue;
1206                 }
1207                 if (td->runstate == TD_REAPED)
1208                         continue;
1209                 if (td->o.use_thread) {
1210                         if (td->runstate == TD_EXITED) {
1211                                 td_set_runstate(td, TD_REAPED);
1212                                 goto reaped;
1213                         }
1214                         continue;
1215                 }
1216
1217                 flags = WNOHANG;
1218                 if (td->runstate == TD_EXITED)
1219                         flags = 0;
1220
1221                 /*
1222                  * check if someone quit or got killed in an unusual way
1223                  */
1224                 ret = waitpid(td->pid, &status, flags);
1225                 if (ret < 0) {
1226                         if (errno == ECHILD) {
1227                                 log_err("fio: pid=%d disappeared %d\n",
1228                                                 (int) td->pid, td->runstate);
1229                                 td_set_runstate(td, TD_REAPED);
1230                                 goto reaped;
1231                         }
1232                         perror("waitpid");
1233                 } else if (ret == td->pid) {
1234                         if (WIFSIGNALED(status)) {
1235                                 int sig = WTERMSIG(status);
1236
1237                                 if (sig != SIGQUIT)
1238                                         log_err("fio: pid=%d, got signal=%d\n",
1239                                                         (int) td->pid, sig);
1240                                 td_set_runstate(td, TD_REAPED);
1241                                 goto reaped;
1242                         }
1243                         if (WIFEXITED(status)) {
1244                                 if (WEXITSTATUS(status) && !td->error)
1245                                         td->error = WEXITSTATUS(status);
1246
1247                                 td_set_runstate(td, TD_REAPED);
1248                                 goto reaped;
1249                         }
1250                 }
1251
1252                 /*
1253                  * thread is not dead, continue
1254                  */
1255                 pending++;
1256                 continue;
1257 reaped:
1258                 (*nr_running)--;
1259                 (*m_rate) -= td->o.ratemin;
1260                 (*t_rate) -= td->o.rate;
1261                 if (!td->pid)
1262                         pending--;
1263
1264                 if (td->error)
1265                         exit_value++;
1266
1267                 done_secs += mtime_since_now(&td->epoch) / 1000;
1268         }
1269
1270         if (*nr_running == cputhreads && !pending && realthreads)
1271                 terminate_threads(TERMINATE_ALL);
1272 }
1273
1274 static void *gtod_thread_main(void *data)
1275 {
1276         fio_mutex_up(startup_mutex);
1277
1278         /*
1279          * As long as we have jobs around, update the clock. It would be nice
1280          * to have some way of NOT hammering that CPU with gettimeofday(),
1281          * but I'm not sure what to use outside of a simple CPU nop to relax
1282          * it - we don't want to lose precision.
1283          */
1284         while (threads) {
1285                 fio_gtod_update();
1286                 nop;
1287         }
1288
1289         return NULL;
1290 }
1291
1292 static int fio_start_gtod_thread(void)
1293 {
1294         int ret;
1295
1296         ret = pthread_create(&gtod_thread, NULL, gtod_thread_main, NULL);
1297         if (ret) {
1298                 log_err("Can't create gtod thread: %s\n", strerror(ret));
1299                 return 1;
1300         }
1301
1302         ret = pthread_detach(gtod_thread);
1303         if (ret) {
1304                 log_err("Can't detatch gtod thread: %s\n", strerror(ret));
1305                 return 1;
1306         }
1307
1308         dprint(FD_MUTEX, "wait on startup_mutex\n");
1309         fio_mutex_down(startup_mutex);
1310         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
1311         return 0;
1312 }
1313
1314 /*
1315  * Main function for kicking off and reaping jobs, as needed.
1316  */
1317 static void run_threads(void)
1318 {
1319         struct thread_data *td;
1320         unsigned long spent;
1321         int i, todo, nr_running, m_rate, t_rate, nr_started;
1322
1323         if (fio_pin_memory())
1324                 return;
1325
1326         if (fio_gtod_offload && fio_start_gtod_thread())
1327                 return;
1328
1329         if (!terse_output) {
1330                 printf("Starting ");
1331                 if (nr_thread)
1332                         printf("%d thread%s", nr_thread,
1333                                                 nr_thread > 1 ? "s" : "");
1334                 if (nr_process) {
1335                         if (nr_thread)
1336                                 printf(" and ");
1337                         printf("%d process%s", nr_process,
1338                                                 nr_process > 1 ? "es" : "");
1339                 }
1340                 printf("\n");
1341                 fflush(stdout);
1342         }
1343
1344         set_sig_handlers();
1345
1346         todo = thread_number;
1347         nr_running = 0;
1348         nr_started = 0;
1349         m_rate = t_rate = 0;
1350
1351         for_each_td(td, i) {
1352                 print_status_init(td->thread_number - 1);
1353
1354                 if (!td->o.create_serialize) {
1355                         init_disk_util(td);
1356                         continue;
1357                 }
1358
1359                 /*
1360                  * do file setup here so it happens sequentially,
1361                  * we don't want X number of threads getting their
1362                  * client data interspersed on disk
1363                  */
1364                 if (setup_files(td)) {
1365                         exit_value++;
1366                         if (td->error)
1367                                 log_err("fio: pid=%d, err=%d/%s\n",
1368                                         (int) td->pid, td->error, td->verror);
1369                         td_set_runstate(td, TD_REAPED);
1370                         todo--;
1371                 } else {
1372                         struct fio_file *f;
1373                         unsigned int i;
1374
1375                         /*
1376                          * for sharing to work, each job must always open
1377                          * its own files. so close them, if we opened them
1378                          * for creation
1379                          */
1380                         for_each_file(td, f, i)
1381                                 td_io_close_file(td, f);
1382                 }
1383
1384                 init_disk_util(td);
1385         }
1386
1387         set_genesis_time();
1388
1389         while (todo) {
1390                 struct thread_data *map[MAX_JOBS];
1391                 struct timeval this_start;
1392                 int this_jobs = 0, left;
1393
1394                 /*
1395                  * create threads (TD_NOT_CREATED -> TD_CREATED)
1396                  */
1397                 for_each_td(td, i) {
1398                         if (td->runstate != TD_NOT_CREATED)
1399                                 continue;
1400
1401                         /*
1402                          * never got a chance to start, killed by other
1403                          * thread for some reason
1404                          */
1405                         if (td->terminate) {
1406                                 todo--;
1407                                 continue;
1408                         }
1409
1410                         if (td->o.start_delay) {
1411                                 spent = mtime_since_genesis();
1412
1413                                 if (td->o.start_delay * 1000 > spent)
1414                                         continue;
1415                         }
1416
1417                         if (td->o.stonewall && (nr_started || nr_running)) {
1418                                 dprint(FD_PROCESS, "%s: stonewall wait\n",
1419                                                         td->o.name);
1420                                 break;
1421                         }
1422
1423                         /*
1424                          * Set state to created. Thread will transition
1425                          * to TD_INITIALIZED when it's done setting up.
1426                          */
1427                         td_set_runstate(td, TD_CREATED);
1428                         map[this_jobs++] = td;
1429                         nr_started++;
1430
1431                         if (td->o.use_thread) {
1432                                 int ret;
1433
1434                                 dprint(FD_PROCESS, "will pthread_create\n");
1435                                 ret = pthread_create(&td->thread, NULL,
1436                                                         thread_main, td);
1437                                 if (ret) {
1438                                         log_err("pthread_create: %s\n",
1439                                                         strerror(ret));
1440                                         nr_started--;
1441                                         break;
1442                                 }
1443                                 ret = pthread_detach(td->thread);
1444                                 if (ret)
1445                                         log_err("pthread_detach: %s",
1446                                                         strerror(ret));
1447                         } else {
1448                                 pid_t pid;
1449                                 dprint(FD_PROCESS, "will fork\n");
1450                                 pid = fork();
1451                                 if (!pid) {
1452                                         int ret = fork_main(shm_id, i);
1453
1454                                         _exit(ret);
1455                                 } else if (i == fio_debug_jobno)
1456                                         *fio_debug_jobp = pid;
1457                         }
1458                         dprint(FD_MUTEX, "wait on startup_mutex\n");
1459                         fio_mutex_down(startup_mutex);
1460                         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
1461                 }
1462
1463                 /*
1464                  * Wait for the started threads to transition to
1465                  * TD_INITIALIZED.
1466                  */
1467                 fio_gettime(&this_start, NULL);
1468                 left = this_jobs;
1469                 while (left && !fio_abort) {
1470                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1471                                 break;
1472
1473                         usleep(100000);
1474
1475                         for (i = 0; i < this_jobs; i++) {
1476                                 td = map[i];
1477                                 if (!td)
1478                                         continue;
1479                                 if (td->runstate == TD_INITIALIZED) {
1480                                         map[i] = NULL;
1481                                         left--;
1482                                 } else if (td->runstate >= TD_EXITED) {
1483                                         map[i] = NULL;
1484                                         left--;
1485                                         todo--;
1486                                         nr_running++; /* work-around... */
1487                                 }
1488                         }
1489                 }
1490
1491                 if (left) {
1492                         log_err("fio: %d jobs failed to start\n", left);
1493                         for (i = 0; i < this_jobs; i++) {
1494                                 td = map[i];
1495                                 if (!td)
1496                                         continue;
1497                                 kill(td->pid, SIGTERM);
1498                         }
1499                         break;
1500                 }
1501
1502                 /*
1503                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1504                  */
1505                 for_each_td(td, i) {
1506                         if (td->runstate != TD_INITIALIZED)
1507                                 continue;
1508
1509                         if (in_ramp_time(td))
1510                                 td_set_runstate(td, TD_RAMP);
1511                         else
1512                                 td_set_runstate(td, TD_RUNNING);
1513                         nr_running++;
1514                         nr_started--;
1515                         m_rate += td->o.ratemin;
1516                         t_rate += td->o.rate;
1517                         todo--;
1518                         fio_mutex_up(td->mutex);
1519                 }
1520
1521                 reap_threads(&nr_running, &t_rate, &m_rate);
1522
1523                 if (todo)
1524                         usleep(100000);
1525         }
1526
1527         while (nr_running) {
1528                 reap_threads(&nr_running, &t_rate, &m_rate);
1529                 usleep(10000);
1530         }
1531
1532         update_io_ticks();
1533         fio_unpin_memory();
1534 }
1535
1536 int main(int argc, char *argv[])
1537 {
1538         long ps;
1539
1540         sinit();
1541
1542         /*
1543          * We need locale for number printing, if it isn't set then just
1544          * go with the US format.
1545          */
1546         if (!getenv("LC_NUMERIC"))
1547                 setlocale(LC_NUMERIC, "en_US");
1548
1549         if (parse_options(argc, argv))
1550                 return 1;
1551
1552         if (!thread_number)
1553                 return 0;
1554
1555         ps = sysconf(_SC_PAGESIZE);
1556         if (ps < 0) {
1557                 log_err("Failed to get page size\n");
1558                 return 1;
1559         }
1560
1561         page_size = ps;
1562         page_mask = ps - 1;
1563
1564         if (write_bw_log) {
1565                 setup_log(&agg_io_log[DDIR_READ]);
1566                 setup_log(&agg_io_log[DDIR_WRITE]);
1567         }
1568
1569         startup_mutex = fio_mutex_init(0);
1570         writeout_mutex = fio_mutex_init(1);
1571
1572         set_genesis_time();
1573
1574         status_timer_arm();
1575
1576         run_threads();
1577
1578         if (!fio_abort) {
1579                 show_run_stats();
1580                 if (write_bw_log) {
1581                         __finish_log(agg_io_log[DDIR_READ], "agg-read_bw.log");
1582                         __finish_log(agg_io_log[DDIR_WRITE],
1583                                         "agg-write_bw.log");
1584                 }
1585         }
1586
1587         fio_mutex_remove(startup_mutex);
1588         fio_mutex_remove(writeout_mutex);
1589         return exit_value;
1590 }