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