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
  39 unsigned long page_mask;
  40 unsigned long page_size;
  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 nr_process = 0;
  47 int nr_thread = 0;
  48 int shm_id = 0;
  49 int temp_stall_ts;
  50
  51 static struct fio_sem *startup_sem;
  52 static volatile int fio_abort;
  53 static int exit_value;
  54
  55 struct io_log *agg_io_log[2];
  56
  57 #define TERMINATE_ALL           (-1)
  58 #define JOB_START_TIMEOUT       (5 * 1000)
  59
  60 static inline void td_set_runstate(struct thread_data *td, int runstate)
  61 {
  62         td->runstate = runstate;
  63 }
  64
  65 static void terminate_threads(int group_id)
  66 {
  67         struct thread_data *td;
  68         int i;
  69
  70         for_each_td(td, i) {
  71                 if (group_id == TERMINATE_ALL || groupid == td->groupid) {
  72                         /*
  73                          * if the thread is running, just let it exit
  74                          */
  75                         if (td->runstate < TD_RUNNING)
  76                                 kill(td->pid, SIGQUIT);
  77                         td->terminate = 1;
  78                         td->o.start_delay = 0;
  79                 }
  80         }
  81 }
  82
  83 static void sig_handler(int sig)
  84 {
  85         switch (sig) {
  86                 case SIGALRM:
  87                         update_io_ticks();
  88                         disk_util_timer_arm();
  89                         print_thread_status();
  90                         break;
  91                 default:
  92                         printf("\nfio: terminating on signal %d\n", sig);
  93                         fflush(stdout);
  94                         terminate_threads(TERMINATE_ALL);
  95                         break;
  96         }
  97 }
  98
  99 /*
 100  * Check if we are above the minimum rate given.
 101  */
 102 static int check_min_rate(struct thread_data *td, struct timeval *now)
 103 {
 104         unsigned long long bytes = 0;
 105         unsigned long iops = 0;
 106         unsigned long spent;
 107         unsigned long rate;
 108
 109         /*
 110          * No minimum rate set, always ok
 111          */
 112         if (!td->o.ratemin && !td->o.rate_iops_min)
 113                 return 0;
 114
 115         /*
 116          * allow a 2 second settle period in the beginning
 117          */
 118         if (mtime_since(&td->start, now) < 2000)
 119                 return 0;
 120
 121         if (td_read(td)) {
 122                 iops += td->io_blocks[DDIR_READ];
 123                 bytes += td->this_io_bytes[DDIR_READ];
 124         }
 125         if (td_write(td)) {
 126                 iops += td->io_blocks[DDIR_WRITE];
 127                 bytes += td->this_io_bytes[DDIR_WRITE];
 128         }
 129
 130         /*
 131          * if rate blocks is set, sample is running
 132          */
 133         if (td->rate_bytes || td->rate_blocks) {
 134                 spent = mtime_since(&td->lastrate, now);
 135                 if (spent < td->o.ratecycle)
 136                         return 0;
 137
 138                 if (td->o.rate) {
 139                         /*
 140                          * check bandwidth specified rate
 141                          */
 142                         if (bytes < td->rate_bytes) {
 143                                 log_err("%s: min rate %u not met\n", td->o.name, td->o.ratemin);
 144                                 return 1;
 145                         } else {
 146                                 rate = (bytes - td->rate_bytes) / spent;
 147                                 if (rate < td->o.ratemin || bytes < td->rate_bytes) {
 148                                         log_err("%s: min rate %u not met, got %luKiB/sec\n", td->o.name, td->o.ratemin, rate);
 149                                         return 1;
 150                                 }
 151                         }
 152                 } else {
 153                         /*
 154                          * checks iops specified rate
 155                          */
 156                         if (iops < td->o.rate_iops) {
 157                                 log_err("%s: min iops rate %u not met\n", td->o.name, td->o.rate_iops);
 158                                 return 1;
 159                         } else {
 160                                 rate = (iops - td->rate_blocks) / spent;
 161                                 if (rate < td->o.rate_iops_min || iops < td->rate_blocks) {
 162                                         log_err("%s: min iops rate %u not met, got %lu\n", td->o.name, td->o.rate_iops_min, rate);
 163                                 }
 164                         }
 165                 }
 166         }
 167
 168         td->rate_bytes = bytes;
 169         td->rate_blocks = iops;
 170         memcpy(&td->lastrate, now, sizeof(*now));
 171         return 0;
 172 }
 173
 174 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
 175 {
 176         if (!td->o.timeout)
 177                 return 0;
 178         if (mtime_since(&td->epoch, t) >= td->o.timeout * 1000)
 179                 return 1;
 180
 181         return 0;
 182 }
 183
 184 /*
 185  * When job exits, we can cancel the in-flight IO if we are using async
 186  * io. Attempt to do so.
 187  */
 188 static void cleanup_pending_aio(struct thread_data *td)
 189 {
 190         struct list_head *entry, *n;
 191         struct io_u *io_u;
 192         int r;
 193
 194         /*
 195          * get immediately available events, if any
 196          */
 197         r = io_u_queued_complete(td, 0);
 198         if (r < 0)
 199                 return;
 200
 201         /*
 202          * now cancel remaining active events
 203          */
 204         if (td->io_ops->cancel) {
 205                 list_for_each_safe(entry, n, &td->io_u_busylist) {
 206                         io_u = list_entry(entry, struct io_u, list);
 207
 208                         /*
 209                          * if the io_u isn't in flight, then that generally
 210                          * means someone leaked an io_u. complain but fix
 211                          * it up, so we don't stall here.
 212                          */
 213                         if ((io_u->flags & IO_U_F_FLIGHT) == 0) {
 214                                 log_err("fio: non-busy IO on busy list\n");
 215                                 put_io_u(td, io_u);
 216                         } else {
 217                                 r = td->io_ops->cancel(td, io_u);
 218                                 if (!r)
 219                                         put_io_u(td, io_u);
 220                         }
 221                 }
 222         }
 223
 224         if (td->cur_depth)
 225                 r = io_u_queued_complete(td, td->cur_depth);
 226 }
 227
 228 /*
 229  * Helper to handle the final sync of a file. Works just like the normal
 230  * io path, just does everything sync.
 231  */
 232 static int fio_io_sync(struct thread_data *td, struct fio_file *f)
 233 {
 234         struct io_u *io_u = __get_io_u(td);
 235         int ret;
 236
 237         if (!io_u)
 238                 return 1;
 239
 240         io_u->ddir = DDIR_SYNC;
 241         io_u->file = f;
 242
 243         if (td_io_prep(td, io_u)) {
 244                 put_io_u(td, io_u);
 245                 return 1;
 246         }
 247
 248 requeue:
 249         ret = td_io_queue(td, io_u);
 250         if (ret < 0) {
 251                 td_verror(td, io_u->error, "td_io_queue");
 252                 put_io_u(td, io_u);
 253                 return 1;
 254         } else if (ret == FIO_Q_QUEUED) {
 255                 if (io_u_queued_complete(td, 1) < 0)
 256                         return 1;
 257         } else if (ret == FIO_Q_COMPLETED) {
 258                 if (io_u->error) {
 259                         td_verror(td, io_u->error, "td_io_queue");
 260                         return 1;
 261                 }
 262
 263                 if (io_u_sync_complete(td, io_u) < 0)
 264                         return 1;
 265         } else if (ret == FIO_Q_BUSY) {
 266                 if (td_io_commit(td))
 267                         return 1;
 268                 goto requeue;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * The main verify engine. Runs over the writes we previously submitted,
 276  * reads the blocks back in, and checks the crc/md5 of the data.
 277  */
 278 static void do_verify(struct thread_data *td)
 279 {
 280         struct fio_file *f;
 281         struct io_u *io_u;
 282         int ret, min_events;
 283         unsigned int i;
 284
 285         /*
 286          * sync io first and invalidate cache, to make sure we really
 287          * read from disk.
 288          */
 289         for_each_file(td, f, i) {
 290                 if (!(f->flags & FIO_FILE_OPEN))
 291                         continue;
 292                 if (fio_io_sync(td, f))
 293                         break;
 294                 if (file_invalidate_cache(td, f))
 295                         break;
 296         }
 297
 298         if (td->error)
 299                 return;
 300
 301         td_set_runstate(td, TD_VERIFYING);
 302
 303         io_u = NULL;
 304         while (!td->terminate) {
 305                 int ret2;
 306
 307                 io_u = __get_io_u(td);
 308                 if (!io_u)
 309                         break;
 310
 311                 if (runtime_exceeded(td, &io_u->start_time)) {
 312                         put_io_u(td, io_u);
 313                         break;
 314                 }
 315
 316                 if (get_next_verify(td, io_u)) {
 317                         put_io_u(td, io_u);
 318                         break;
 319                 }
 320
 321                 if (td_io_prep(td, io_u)) {
 322                         put_io_u(td, io_u);
 323                         break;
 324                 }
 325
 326                 io_u->end_io = verify_io_u;
 327
 328                 ret = td_io_queue(td, io_u);
 329                 switch (ret) {
 330                 case FIO_Q_COMPLETED:
 331                         if (io_u->error)
 332                                 ret = -io_u->error;
 333                         else if (io_u->resid) {
 334                                 int bytes = io_u->xfer_buflen - io_u->resid;
 335
 336                                 /*
 337                                  * zero read, fail
 338                                  */
 339                                 if (!bytes) {
 340                                         td_verror(td, ENODATA, "full resid");
 341                                         put_io_u(td, io_u);
 342                                         break;
 343                                 }
 344
 345                                 io_u->xfer_buflen = io_u->resid;
 346                                 io_u->xfer_buf += bytes;
 347                                 io_u->offset += bytes;
 348
 349                                 if (io_u->offset == io_u->file->real_file_size)
 350                                         goto sync_done;
 351
 352                                 requeue_io_u(td, &io_u);
 353                         } else {
 354 sync_done:
 355                                 ret = io_u_sync_complete(td, io_u);
 356                                 if (ret < 0)
 357                                         break;
 358                         }
 359                         continue;
 360                 case FIO_Q_QUEUED:
 361                         break;
 362                 case FIO_Q_BUSY:
 363                         requeue_io_u(td, &io_u);
 364                         ret2 = td_io_commit(td);
 365                         if (ret2 < 0)
 366                                 ret = ret2;
 367                         break;
 368                 default:
 369                         assert(ret < 0);
 370                         td_verror(td, -ret, "td_io_queue");
 371                         break;
 372                 }
 373
 374                 if (ret < 0 || td->error)
 375                         break;
 376
 377                 /*
 378                  * if we can queue more, do so. but check if there are
 379                  * completed io_u's first.
 380                  */
 381                 min_events = 0;
 382                 if (queue_full(td) || ret == FIO_Q_BUSY) {
 383                         min_events = 1;
 384
 385                         if (td->cur_depth > td->o.iodepth_low)
 386                                 min_events = td->cur_depth - td->o.iodepth_low;
 387                 }
 388
 389                 /*
 390                  * Reap required number of io units, if any, and do the
 391                  * verification on them through the callback handler
 392                  */
 393                 if (io_u_queued_complete(td, min_events) < 0)
 394                         break;
 395         }
 396
 397         if (!td->error) {
 398                 min_events = td->cur_depth;
 399
 400                 if (min_events)
 401                         ret = io_u_queued_complete(td, min_events);
 402         } else
 403                 cleanup_pending_aio(td);
 404
 405         td_set_runstate(td, TD_RUNNING);
 406 }
 407
 408 /*
 409  * Main IO worker function. It retrieves io_u's to process and queues
 410  * and reaps them, checking for rate and errors along the way.
 411  */
 412 static void do_io(struct thread_data *td)
 413 {
 414         struct timeval s;
 415         unsigned long usec;
 416         unsigned int i;
 417         int ret = 0;
 418
 419         td_set_runstate(td, TD_RUNNING);
 420
 421         while ((td->this_io_bytes[0] + td->this_io_bytes[1]) < td->o.size) {
 422                 struct timeval comp_time;
 423                 long bytes_done = 0;
 424                 int min_evts = 0;
 425                 struct io_u *io_u;
 426                 int ret2;
 427
 428                 if (td->terminate)
 429                         break;
 430
 431                 io_u = get_io_u(td);
 432                 if (!io_u)
 433                         break;
 434
 435                 memcpy(&s, &io_u->start_time, sizeof(s));
 436
 437                 if (runtime_exceeded(td, &s)) {
 438                         put_io_u(td, io_u);
 439                         break;
 440                 }
 441
 442                 ret = td_io_queue(td, io_u);
 443                 switch (ret) {
 444                 case FIO_Q_COMPLETED:
 445                         if (io_u->error)
 446                                 ret = -io_u->error;
 447                         else if (io_u->resid) {
 448                                 int bytes = io_u->xfer_buflen - io_u->resid;
 449
 450                                 /*
 451                                  * zero read, fail
 452                                  */
 453                                 if (!bytes) {
 454                                         td_verror(td, ENODATA, "full resid");
 455                                         put_io_u(td, io_u);
 456                                         break;
 457                                 }
 458
 459                                 io_u->xfer_buflen = io_u->resid;
 460                                 io_u->xfer_buf += bytes;
 461                                 io_u->offset += bytes;
 462
 463                                 if (io_u->offset == io_u->file->real_file_size)
 464                                         goto sync_done;
 465
 466                                 requeue_io_u(td, &io_u);
 467                         } else {
 468 sync_done:
 469                                 fio_gettime(&comp_time, NULL);
 470                                 bytes_done = io_u_sync_complete(td, io_u);
 471                                 if (bytes_done < 0)
 472                                         ret = bytes_done;
 473                         }
 474                         break;
 475                 case FIO_Q_QUEUED:
 476                         /*
 477                          * if the engine doesn't have a commit hook,
 478                          * the io_u is really queued. if it does have such
 479                          * a hook, it has to call io_u_queued() itself.
 480                          */
 481                         if (td->io_ops->commit == NULL)
 482                                 io_u_queued(td, io_u);
 483                         break;
 484                 case FIO_Q_BUSY:
 485                         requeue_io_u(td, &io_u);
 486                         ret2 = td_io_commit(td);
 487                         if (ret2 < 0)
 488                                 ret = ret2;
 489                         break;
 490                 default:
 491                         assert(ret < 0);
 492                         put_io_u(td, io_u);
 493                         break;
 494                 }
 495
 496                 if (ret < 0 || td->error)
 497                         break;
 498
 499                 /*
 500                  * See if we need to complete some commands
 501                  */
 502                 if (ret == FIO_Q_QUEUED || ret == FIO_Q_BUSY) {
 503                         min_evts = 0;
 504                         if (queue_full(td) || ret == FIO_Q_BUSY) {
 505                                 min_evts = 1;
 506
 507                                 if (td->cur_depth > td->o.iodepth_low)
 508                                         min_evts = td->cur_depth - td->o.iodepth_low;
 509                         }
 510
 511                         fio_gettime(&comp_time, NULL);
 512                         bytes_done = io_u_queued_complete(td, min_evts);
 513                         if (bytes_done < 0)
 514                                 break;
 515                 }
 516
 517                 if (!bytes_done)
 518                         continue;
 519
 520                 /*
 521                  * the rate is batched for now, it should work for batches
 522                  * of completions except the very first one which may look
 523                  * a little bursty
 524                  */
 525                 usec = utime_since(&s, &comp_time);
 526
 527                 rate_throttle(td, usec, bytes_done);
 528
 529                 if (check_min_rate(td, &comp_time)) {
 530                         if (exitall_on_terminate)
 531                                 terminate_threads(td->groupid);
 532                         td_verror(td, ENODATA, "check_min_rate");
 533                         break;
 534                 }
 535
 536                 if (td->o.thinktime) {
 537                         unsigned long long b;
 538
 539                         b = td->io_blocks[0] + td->io_blocks[1];
 540                         if (!(b % td->o.thinktime_blocks)) {
 541                                 int left;
 542
 543                                 if (td->o.thinktime_spin)
 544                                         __usec_sleep(td->o.thinktime_spin);
 545
 546                                 left = td->o.thinktime - td->o.thinktime_spin;
 547                                 if (left)
 548                                         usec_sleep(td, left);
 549                         }
 550                 }
 551         }
 552
 553         if (!td->error) {
 554                 struct fio_file *f;
 555
 556                 i = td->cur_depth;
 557                 if (i)
 558                         ret = io_u_queued_complete(td, i);
 559
 560                 if (should_fsync(td) && td->o.end_fsync) {
 561                         td_set_runstate(td, TD_FSYNCING);
 562
 563                         for_each_file(td, f, i) {
 564                                 if (!(f->flags & FIO_FILE_OPEN))
 565                                         continue;
 566                                 fio_io_sync(td, f);
 567                         }
 568                 }
 569         } else
 570                 cleanup_pending_aio(td);
 571 }
 572
 573 static void cleanup_io_u(struct thread_data *td)
 574 {
 575         struct list_head *entry, *n;
 576         struct io_u *io_u;
 577
 578         list_for_each_safe(entry, n, &td->io_u_freelist) {
 579                 io_u = list_entry(entry, struct io_u, list);
 580
 581                 list_del(&io_u->list);
 582                 free(io_u);
 583         }
 584
 585         free_io_mem(td);
 586 }
 587
 588 /*
 589  * "randomly" fill the buffer contents
 590  */
 591 static void fill_rand_buf(struct io_u *io_u, int max_bs)
 592 {
 593         int *ptr = io_u->buf;
 594
 595         while ((void *) ptr - io_u->buf < max_bs) {
 596                 *ptr = rand() * 0x9e370001;
 597                 ptr++;
 598         }
 599 }
 600
 601 static int init_io_u(struct thread_data *td)
 602 {
 603         unsigned long long buf_size;
 604         struct io_u *io_u;
 605         unsigned int max_bs;
 606         int i, max_units;
 607         char *p;
 608
 609         if (td->io_ops->flags & FIO_SYNCIO)
 610                 max_units = 1;
 611         else
 612                 max_units = td->o.iodepth;
 613
 614         max_bs = max(td->o.max_bs[DDIR_READ], td->o.max_bs[DDIR_WRITE]);
 615         buf_size = (unsigned long long) max_bs * (unsigned long long) max_units;
 616         buf_size += page_mask;
 617         if (buf_size != (size_t) buf_size) {
 618                 log_err("fio: IO memory too large. Reduce max_bs or iodepth\n");
 619                 return 1;
 620         }
 621
 622         td->orig_buffer_size = buf_size;
 623
 624         if (td->o.mem_type == MEM_SHMHUGE || td->o.mem_type == MEM_MMAPHUGE)
 625                 td->orig_buffer_size = (td->orig_buffer_size + td->o.hugepage_size - 1) & ~(td->o.hugepage_size - 1);
 626         else if (td->orig_buffer_size & page_mask)
 627                 td->orig_buffer_size = (td->orig_buffer_size + page_mask) & ~page_mask;
 628
 629         if (allocate_io_mem(td))
 630                 return 1;
 631
 632         p = ALIGN(td->orig_buffer);
 633         for (i = 0; i < max_units; i++) {
 634                 io_u = malloc(sizeof(*io_u));
 635                 memset(io_u, 0, sizeof(*io_u));
 636                 INIT_LIST_HEAD(&io_u->list);
 637
 638                 io_u->buf = p + max_bs * i;
 639                 if (td_write(td) || td_rw(td))
 640                         fill_rand_buf(io_u, max_bs);
 641
 642                 io_u->index = i;
 643                 io_u->flags = IO_U_F_FREE;
 644                 list_add(&io_u->list, &td->io_u_freelist);
 645         }
 646
 647         io_u_init_timeout();
 648
 649         return 0;
 650 }
 651
 652 static int switch_ioscheduler(struct thread_data *td)
 653 {
 654         char tmp[256], tmp2[128];
 655         FILE *f;
 656         int ret;
 657
 658         if (td->io_ops->flags & FIO_DISKLESSIO)
 659                 return 0;
 660
 661         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
 662
 663         f = fopen(tmp, "r+");
 664         if (!f) {
 665                 td_verror(td, errno, "fopen");
 666                 return 1;
 667         }
 668
 669         /*
 670          * Set io scheduler.
 671          */
 672         ret = fwrite(td->o.ioscheduler, strlen(td->o.ioscheduler), 1, f);
 673         if (ferror(f) || ret != 1) {
 674                 td_verror(td, errno, "fwrite");
 675                 fclose(f);
 676                 return 1;
 677         }
 678
 679         rewind(f);
 680
 681         /*
 682          * Read back and check that the selected scheduler is now the default.
 683          */
 684         ret = fread(tmp, 1, sizeof(tmp), f);
 685         if (ferror(f) || ret < 0) {
 686                 td_verror(td, errno, "fread");
 687                 fclose(f);
 688                 return 1;
 689         }
 690
 691         sprintf(tmp2, "[%s]", td->o.ioscheduler);
 692         if (!strstr(tmp, tmp2)) {
 693                 log_err("fio: io scheduler %s not found\n", td->o.ioscheduler);
 694                 td_verror(td, EINVAL, "iosched_switch");
 695                 fclose(f);
 696                 return 1;
 697         }
 698
 699         fclose(f);
 700         return 0;
 701 }
 702
 703 static int clear_io_state(struct thread_data *td)
 704 {
 705         struct fio_file *f;
 706         unsigned int i;
 707         int ret;
 708
 709         td->ts.stat_io_bytes[0] = td->ts.stat_io_bytes[1] = 0;
 710         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
 711         td->zone_bytes = 0;
 712         td->rate_bytes = 0;
 713         td->rate_blocks = 0;
 714         td->rw_end_set[0] = td->rw_end_set[1] = 0;
 715
 716         td->last_was_sync = 0;
 717
 718         for_each_file(td, f, i)
 719                 td_io_close_file(td, f);
 720
 721         ret = 0;
 722         for_each_file(td, f, i) {
 723                 ret = td_io_open_file(td, f);
 724                 if (ret)
 725                         break;
 726         }
 727
 728         return ret;
 729 }
 730
 731 /*
 732  * Entry point for the thread based jobs. The process based jobs end up
 733  * here as well, after a little setup.
 734  */
 735 static void *thread_main(void *data)
 736 {
 737         unsigned long long runtime[2];
 738         struct thread_data *td = data;
 739         unsigned long elapsed;
 740         int clear_state;
 741
 742         if (!td->o.use_thread)
 743                 setsid();
 744
 745         td->pid = getpid();
 746
 747         INIT_LIST_HEAD(&td->io_u_freelist);
 748         INIT_LIST_HEAD(&td->io_u_busylist);
 749         INIT_LIST_HEAD(&td->io_u_requeues);
 750         INIT_LIST_HEAD(&td->io_log_list);
 751         INIT_LIST_HEAD(&td->io_hist_list);
 752         td->io_hist_tree = RB_ROOT;
 753
 754         if (init_io_u(td))
 755                 goto err_sem;
 756
 757         if (fio_setaffinity(td) == -1) {
 758                 td_verror(td, errno, "cpu_set_affinity");
 759                 goto err_sem;
 760         }
 761
 762         if (init_iolog(td))
 763                 goto err_sem;
 764
 765         if (td->ioprio) {
 766                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
 767                         td_verror(td, errno, "ioprio_set");
 768                         goto err_sem;
 769                 }
 770         }
 771
 772         if (nice(td->o.nice) == -1) {
 773                 td_verror(td, errno, "nice");
 774                 goto err_sem;
 775         }
 776
 777         if (td->o.ioscheduler && switch_ioscheduler(td))
 778                 goto err_sem;
 779
 780         td_set_runstate(td, TD_INITIALIZED);
 781         fio_sem_up(startup_sem);
 782         fio_sem_down(td->mutex);
 783
 784         /*
 785          * the ->mutex semaphore is now no longer used, close it to avoid
 786          * eating a file descriptor
 787          */
 788         fio_sem_remove(td->mutex);
 789
 790         if (!td->o.create_serialize && setup_files(td))
 791                 goto err;
 792
 793         if (td_io_init(td))
 794                 goto err;
 795
 796         if (open_files(td))
 797                 goto err;
 798
 799         if (init_random_map(td))
 800                 goto err;
 801
 802         if (td->o.exec_prerun) {
 803                 if (system(td->o.exec_prerun) < 0)
 804                         goto err;
 805         }
 806
 807         fio_gettime(&td->epoch, NULL);
 808         memcpy(&td->timeout_end, &td->epoch, sizeof(td->epoch));
 809         getrusage(RUSAGE_SELF, &td->ts.ru_start);
 810
 811         runtime[0] = runtime[1] = 0;
 812         clear_state = 0;
 813         while (td->o.loops--) {
 814                 fio_gettime(&td->start, NULL);
 815                 memcpy(&td->ts.stat_sample_time, &td->start, sizeof(td->start));
 816
 817                 if (td->o.ratemin)
 818                         memcpy(&td->lastrate, &td->ts.stat_sample_time, sizeof(td->lastrate));
 819
 820                 if (clear_state && clear_io_state(td))
 821                         break;
 822
 823                 prune_io_piece_log(td);
 824
 825                 do_io(td);
 826
 827                 clear_state = 1;
 828
 829                 if (td_read(td) && td->io_bytes[DDIR_READ]) {
 830                         if (td->rw_end_set[DDIR_READ])
 831                                 elapsed = utime_since(&td->start, &td->rw_end[DDIR_READ]);
 832                         else
 833                                 elapsed = utime_since_now(&td->start);
 834
 835                         runtime[DDIR_READ] += elapsed;
 836                 }
 837                 if (td_write(td) && td->io_bytes[DDIR_WRITE]) {
 838                         if (td->rw_end_set[DDIR_WRITE])
 839                                 elapsed = utime_since(&td->start, &td->rw_end[DDIR_WRITE]);
 840                         else
 841                                 elapsed = utime_since_now(&td->start);
 842
 843                         runtime[DDIR_WRITE] += elapsed;
 844                 }
 845
 846                 if (td->error || td->terminate)
 847                         break;
 848
 849                 if (td->o.verify == VERIFY_NONE)
 850                         continue;
 851
 852                 if (clear_io_state(td))
 853                         break;
 854
 855                 fio_gettime(&td->start, NULL);
 856
 857                 do_verify(td);
 858
 859                 runtime[DDIR_READ] += utime_since_now(&td->start);
 860
 861                 if (td->error || td->terminate)
 862                         break;
 863         }
 864
 865         update_rusage_stat(td);
 866         td->ts.runtime[0] = runtime[0] / 1000;
 867         td->ts.runtime[1] = runtime[1] / 1000;
 868         td->ts.total_run_time = mtime_since_now(&td->epoch);
 869         td->ts.io_bytes[0] = td->io_bytes[0];
 870         td->ts.io_bytes[1] = td->io_bytes[1];
 871
 872         if (td->ts.bw_log)
 873                 finish_log(td, td->ts.bw_log, "bw");
 874         if (td->ts.slat_log)
 875                 finish_log(td, td->ts.slat_log, "slat");
 876         if (td->ts.clat_log)
 877                 finish_log(td, td->ts.clat_log, "clat");
 878         if (td->o.write_iolog_file)
 879                 write_iolog_close(td);
 880         if (td->o.exec_postrun) {
 881                 if (system(td->o.exec_postrun) < 0)
 882                         log_err("fio: postrun %s failed\n", td->o.exec_postrun);
 883         }
 884
 885         if (exitall_on_terminate)
 886                 terminate_threads(td->groupid);
 887
 888 err:
 889         if (td->error)
 890                 printf("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
 891         close_files(td);
 892         close_ioengine(td);
 893         cleanup_io_u(td);
 894         options_mem_free(td);
 895         td_set_runstate(td, TD_EXITED);
 896         return (void *) (unsigned long) td->error;
 897 err_sem:
 898         fio_sem_up(startup_sem);
 899         goto err;
 900 }
 901
 902 /*
 903  * We cannot pass the td data into a forked process, so attach the td and
 904  * pass it to the thread worker.
 905  */
 906 static int fork_main(int shmid, int offset)
 907 {
 908         struct thread_data *td;
 909         void *data, *ret;
 910
 911         data = shmat(shmid, NULL, 0);
 912         if (data == (void *) -1) {
 913                 int __err = errno;
 914
 915                 perror("shmat");
 916                 return __err;
 917         }
 918
 919         td = data + offset * sizeof(struct thread_data);
 920         ret = thread_main(td);
 921         shmdt(data);
 922         return (int) (unsigned long) ret;
 923 }
 924
 925 /*
 926  * Run over the job map and reap the threads that have exited, if any.
 927  */
 928 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
 929 {
 930         struct thread_data *td;
 931         int i, cputhreads, pending, status, ret;
 932
 933         /*
 934          * reap exited threads (TD_EXITED -> TD_REAPED)
 935          */
 936         pending = cputhreads = 0;
 937         for_each_td(td, i) {
 938                 int flags = 0;
 939
 940                 /*
 941                  * ->io_ops is NULL for a thread that has closed its
 942                  * io engine
 943                  */
 944                 if (td->io_ops && !strcmp(td->io_ops->name, "cpuio"))
 945                         cputhreads++;
 946
 947                 if (!td->pid || td->runstate == TD_REAPED)
 948                         continue;
 949                 if (td->o.use_thread) {
 950                         if (td->runstate == TD_EXITED) {
 951                                 td_set_runstate(td, TD_REAPED);
 952                                 goto reaped;
 953                         }
 954                         continue;
 955                 }
 956
 957                 flags = WNOHANG;
 958                 if (td->runstate == TD_EXITED)
 959                         flags = 0;
 960
 961                 /*
 962                  * check if someone quit or got killed in an unusual way
 963                  */
 964                 ret = waitpid(td->pid, &status, flags);
 965                 if (ret < 0) {
 966                         if (errno == ECHILD) {
 967                                 log_err("fio: pid=%d disappeared %d\n", td->pid, td->runstate);
 968                                 td_set_runstate(td, TD_REAPED);
 969                                 goto reaped;
 970                         }
 971                         perror("waitpid");
 972                 } else if (ret == td->pid) {
 973                         if (WIFSIGNALED(status)) {
 974                                 int sig = WTERMSIG(status);
 975
 976                                 if (sig != SIGQUIT)
 977                                         log_err("fio: pid=%d, got signal=%d\n", td->pid, sig);
 978                                 td_set_runstate(td, TD_REAPED);
 979                                 goto reaped;
 980                         }
 981                         if (WIFEXITED(status)) {
 982                                 if (WEXITSTATUS(status) && !td->error)
 983                                         td->error = WEXITSTATUS(status);
 984
 985                                 td_set_runstate(td, TD_REAPED);
 986                                 goto reaped;
 987                         }
 988                 }
 989
 990                 /*
 991                  * thread is not dead, continue
 992                  */
 993                 pending++;
 994                 continue;
 995 reaped:
 996                 if (td->o.use_thread) {
 997                         long ret;
 998
 999                         if (pthread_join(td->thread, (void *) &ret))
1000                                 perror("pthread_join");
1001                 }
1002
1003                 (*nr_running)--;
1004                 (*m_rate) -= td->o.ratemin;
1005                 (*t_rate) -= td->o.rate;
1006                 pending--;
1007
1008                 if (td->error)
1009                         exit_value++;
1010         }
1011
1012         if (*nr_running == cputhreads && !pending)
1013                 terminate_threads(TERMINATE_ALL);
1014 }
1015
1016 /*
1017  * Main function for kicking off and reaping jobs, as needed.
1018  */
1019 static void run_threads(void)
1020 {
1021         struct thread_data *td;
1022         unsigned long spent;
1023         int i, todo, nr_running, m_rate, t_rate, nr_started;
1024
1025         if (fio_pin_memory())
1026                 return;
1027
1028         if (!terse_output) {
1029                 printf("Starting ");
1030                 if (nr_thread)
1031                         printf("%d thread%s", nr_thread, nr_thread > 1 ? "s" : "");
1032                 if (nr_process) {
1033                         if (nr_thread)
1034                                 printf(" and ");
1035                         printf("%d process%s", nr_process, nr_process > 1 ? "es" : "");
1036                 }
1037                 printf("\n");
1038                 fflush(stdout);
1039         }
1040
1041         signal(SIGINT, sig_handler);
1042         signal(SIGALRM, sig_handler);
1043
1044         todo = thread_number;
1045         nr_running = 0;
1046         nr_started = 0;
1047         m_rate = t_rate = 0;
1048
1049         for_each_td(td, i) {
1050                 print_status_init(td->thread_number - 1);
1051
1052                 if (!td->o.create_serialize) {
1053                         init_disk_util(td);
1054                         continue;
1055                 }
1056
1057                 /*
1058                  * do file setup here so it happens sequentially,
1059                  * we don't want X number of threads getting their
1060                  * client data interspersed on disk
1061                  */
1062                 if (setup_files(td)) {
1063                         exit_value++;
1064                         if (td->error)
1065                                 log_err("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
1066                         td_set_runstate(td, TD_REAPED);
1067                         todo--;
1068                 }
1069
1070                 init_disk_util(td);
1071         }
1072
1073         set_genesis_time();
1074
1075         while (todo) {
1076                 struct thread_data *map[MAX_JOBS];
1077                 struct timeval this_start;
1078                 int this_jobs = 0, left;
1079
1080                 /*
1081                  * create threads (TD_NOT_CREATED -> TD_CREATED)
1082                  */
1083                 for_each_td(td, i) {
1084                         if (td->runstate != TD_NOT_CREATED)
1085                                 continue;
1086
1087                         /*
1088                          * never got a chance to start, killed by other
1089                          * thread for some reason
1090                          */
1091                         if (td->terminate) {
1092                                 todo--;
1093                                 continue;
1094                         }
1095
1096                         if (td->o.start_delay) {
1097                                 spent = mtime_since_genesis();
1098
1099                                 if (td->o.start_delay * 1000 > spent)
1100                                         continue;
1101                         }
1102
1103                         if (td->o.stonewall && (nr_started || nr_running))
1104                                 break;
1105
1106                         /*
1107                          * Set state to created. Thread will transition
1108                          * to TD_INITIALIZED when it's done setting up.
1109                          */
1110                         td_set_runstate(td, TD_CREATED);
1111                         map[this_jobs++] = td;
1112                         nr_started++;
1113
1114                         if (td->o.use_thread) {
1115                                 if (pthread_create(&td->thread, NULL, thread_main, td)) {
1116                                         perror("thread_create");
1117                                         nr_started--;
1118                                         break;
1119                                 }
1120                         } else {
1121                                 if (!fork()) {
1122                                         int ret = fork_main(shm_id, i);
1123
1124                                         exit(ret);
1125                                 }
1126                         }
1127                         fio_sem_down(startup_sem);
1128                 }
1129
1130                 /*
1131                  * Wait for the started threads to transition to
1132                  * TD_INITIALIZED.
1133                  */
1134                 fio_gettime(&this_start, NULL);
1135                 left = this_jobs;
1136                 while (left && !fio_abort) {
1137                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1138                                 break;
1139
1140                         usleep(100000);
1141
1142                         for (i = 0; i < this_jobs; i++) {
1143                                 td = map[i];
1144                                 if (!td)
1145                                         continue;
1146                                 if (td->runstate == TD_INITIALIZED) {
1147                                         map[i] = NULL;
1148                                         left--;
1149                                 } else if (td->runstate >= TD_EXITED) {
1150                                         map[i] = NULL;
1151                                         left--;
1152                                         todo--;
1153                                         nr_running++; /* work-around... */
1154                                 }
1155                         }
1156                 }
1157
1158                 if (left) {
1159                         log_err("fio: %d jobs failed to start\n", left);
1160                         for (i = 0; i < this_jobs; i++) {
1161                                 td = map[i];
1162                                 if (!td)
1163                                         continue;
1164                                 kill(td->pid, SIGTERM);
1165                         }
1166                         break;
1167                 }
1168
1169                 /*
1170                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1171                  */
1172                 for_each_td(td, i) {
1173                         if (td->runstate != TD_INITIALIZED)
1174                                 continue;
1175
1176                         td_set_runstate(td, TD_RUNNING);
1177                         nr_running++;
1178                         nr_started--;
1179                         m_rate += td->o.ratemin;
1180                         t_rate += td->o.rate;
1181                         todo--;
1182                         fio_sem_up(td->mutex);
1183                 }
1184
1185                 reap_threads(&nr_running, &t_rate, &m_rate);
1186
1187                 if (todo)
1188                         usleep(100000);
1189         }
1190
1191         while (nr_running) {
1192                 reap_threads(&nr_running, &t_rate, &m_rate);
1193                 usleep(10000);
1194         }
1195
1196         update_io_ticks();
1197         fio_unpin_memory();
1198 }
1199
1200 int main(int argc, char *argv[])
1201 {
1202         long ps;
1203
1204         /*
1205          * We need locale for number printing, if it isn't set then just
1206          * go with the US format.
1207          */
1208         if (!getenv("LC_NUMERIC"))
1209                 setlocale(LC_NUMERIC, "en_US");
1210
1211         if (parse_options(argc, argv))
1212                 return 1;
1213
1214         if (!thread_number)
1215                 return 0;
1216
1217         ps = sysconf(_SC_PAGESIZE);
1218         if (ps < 0) {
1219                 log_err("Failed to get page size\n");
1220                 return 1;
1221         }
1222
1223         page_size = ps;
1224         page_mask = ps - 1;
1225
1226         if (write_bw_log) {
1227                 setup_log(&agg_io_log[DDIR_READ]);
1228                 setup_log(&agg_io_log[DDIR_WRITE]);
1229         }
1230
1231         startup_sem = fio_sem_init(0);
1232
1233         set_genesis_time();
1234
1235         disk_util_timer_arm();
1236
1237         run_threads();
1238
1239         if (!fio_abort) {
1240                 show_run_stats();
1241                 if (write_bw_log) {
1242                         __finish_log(agg_io_log[DDIR_READ],"agg-read_bw.log");
1243                         __finish_log(agg_io_log[DDIR_WRITE],"agg-write_bw.log");
1244                 }
1245         }
1246
1247         fio_sem_remove(startup_sem);
1248         return exit_value;
1249 }