632b0025a4e5a8476f1694c91562a57b6cc56580
[fio.git] / fio.c
1 /*
2  * fio - the flexible io tester
3  *
4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
5  * Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
6  *
7  * The license below covers all files distributed with fio unless otherwise
8  * noted in the file itself.
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License
20  *  along with this program; if not, write to the Free Software
21  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
22  *
23  */
24 #include <unistd.h>
25 #include <fcntl.h>
26 #include <string.h>
27 #include <signal.h>
28 #include <time.h>
29 #include <locale.h>
30 #include <assert.h>
31 #include <sys/stat.h>
32 #include <sys/wait.h>
33 #include <sys/ipc.h>
34 #include <sys/shm.h>
35 #include <sys/mman.h>
36
37 #include "fio.h"
38 #include "hash.h"
39 #include "smalloc.h"
40 #include "verify.h"
41 #include "diskutil.h"
42
43 unsigned long page_mask;
44 unsigned long page_size;
45 #define ALIGN(buf)      \
46         (char *) (((unsigned long) (buf) + page_mask) & ~page_mask)
47
48 int groupid = 0;
49 int thread_number = 0;
50 int nr_process = 0;
51 int nr_thread = 0;
52 int shm_id = 0;
53 int temp_stall_ts;
54 unsigned long done_secs = 0;
55
56 static struct fio_mutex *startup_mutex;
57 static struct fio_mutex *writeout_mutex;
58 static volatile int fio_abort;
59 static int exit_value;
60 static struct itimerval itimer;
61 static pthread_t gtod_thread;
62
63 struct io_log *agg_io_log[2];
64
65 #define TERMINATE_ALL           (-1)
66 #define JOB_START_TIMEOUT       (5 * 1000)
67
68 void td_set_runstate(struct thread_data *td, int runstate)
69 {
70         if (td->runstate == runstate)
71                 return;
72
73         dprint(FD_PROCESS, "pid=%d: runstate %d -> %d\n", (int) td->pid,
74                                                 td->runstate, runstate);
75         td->runstate = runstate;
76 }
77
78 static void terminate_threads(int group_id)
79 {
80         struct thread_data *td;
81         int i;
82
83         dprint(FD_PROCESS, "terminate group_id=%d\n", group_id);
84
85         for_each_td(td, i) {
86                 if (group_id == TERMINATE_ALL || groupid == td->groupid) {
87                         dprint(FD_PROCESS, "setting terminate on %s/%d\n",
88                                                 td->o.name, (int) td->pid);
89                         td->terminate = 1;
90                         td->o.start_delay = 0;
91
92                         /*
93                          * if the thread is running, just let it exit
94                          */
95                         if (td->runstate < TD_RUNNING)
96                                 kill(td->pid, SIGQUIT);
97                         else {
98                                 struct ioengine_ops *ops = td->io_ops;
99
100                                 if (ops && (ops->flags & FIO_SIGQUIT))
101                                         kill(td->pid, SIGQUIT);
102                         }
103                 }
104         }
105 }
106
107 static void status_timer_arm(void)
108 {
109         itimer.it_value.tv_sec = 0;
110         itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
111         setitimer(ITIMER_REAL, &itimer, NULL);
112 }
113
114 static void sig_alrm(int fio_unused sig)
115 {
116         if (threads) {
117                 update_io_ticks();
118                 print_thread_status();
119                 status_timer_arm();
120         }
121 }
122
123 /*
124  * Happens on thread runs with ctrl-c, ignore our own SIGQUIT
125  */
126 static void sig_quit(int sig)
127 {
128 }
129
130 static void sig_int(int sig)
131 {
132         if (threads) {
133                 printf("\nfio: terminating on signal %d\n", sig);
134                 fflush(stdout);
135                 terminate_threads(TERMINATE_ALL);
136         }
137 }
138
139 static void sig_ill(int fio_unused sig)
140 {
141         if (!threads)
142                 return;
143
144         log_err("fio: illegal instruction. your cpu does not support "
145                 "the sse4.2 instruction for crc32c\n");
146         terminate_threads(TERMINATE_ALL);
147         exit(4);
148 }
149
150 static void set_sig_handlers(void)
151 {
152         struct sigaction act;
153
154         memset(&act, 0, sizeof(act));
155         act.sa_handler = sig_alrm;
156         act.sa_flags = SA_RESTART;
157         sigaction(SIGALRM, &act, NULL);
158
159         memset(&act, 0, sizeof(act));
160         act.sa_handler = sig_int;
161         act.sa_flags = SA_RESTART;
162         sigaction(SIGINT, &act, NULL);
163
164         memset(&act, 0, sizeof(act));
165         act.sa_handler = sig_ill;
166         act.sa_flags = SA_RESTART;
167         sigaction(SIGILL, &act, NULL);
168
169         memset(&act, 0, sizeof(act));
170         act.sa_handler = sig_quit;
171         act.sa_flags = SA_RESTART;
172         sigaction(SIGQUIT, &act, NULL);
173 }
174
175 /*
176  * Check if we are above the minimum rate given.
177  */
178 static int __check_min_rate(struct thread_data *td, struct timeval *now,
179                             enum td_ddir ddir)
180 {
181         unsigned long long bytes = 0;
182         unsigned long iops = 0;
183         unsigned long spent;
184         unsigned long rate;
185         unsigned int ratemin = 0;
186         unsigned int rate_iops = 0;
187         unsigned int rate_iops_min = 0;
188
189         if (!td->o.ratemin[ddir] && !td->o.rate_iops_min[ddir])
190                 return 0;
191
192         /*
193          * allow a 2 second settle period in the beginning
194          */
195         if (mtime_since(&td->start, now) < 2000)
196                 return 0;
197
198         iops += td->io_blocks[ddir];
199         bytes += td->this_io_bytes[ddir];
200         ratemin += td->o.ratemin[ddir];
201         rate_iops += td->o.rate_iops[ddir];
202         rate_iops_min += td->o.rate_iops_min[ddir];
203
204         /*
205          * if rate blocks is set, sample is running
206          */
207         if (td->rate_bytes[ddir] || td->rate_blocks[ddir]) {
208                 spent = mtime_since(&td->lastrate[ddir], now);
209                 if (spent < td->o.ratecycle)
210                         return 0;
211
212                 if (td->o.rate[ddir]) {
213                         /*
214                          * check bandwidth specified rate
215                          */
216                         if (bytes < td->rate_bytes[ddir]) {
217                                 log_err("%s: min rate %u not met\n", td->o.name,
218                                                                 ratemin);
219                                 return 1;
220                         } else {
221                                 rate = ((bytes - td->rate_bytes[ddir]) * 1000) / spent;
222                                 if (rate < ratemin ||
223                                     bytes < td->rate_bytes[ddir]) {
224                                         log_err("%s: min rate %u not met, got"
225                                                 " %luKiB/sec\n", td->o.name,
226                                                         ratemin, rate);
227                                         return 1;
228                                 }
229                         }
230                 } else {
231                         /*
232                          * checks iops specified rate
233                          */
234                         if (iops < rate_iops) {
235                                 log_err("%s: min iops rate %u not met\n",
236                                                 td->o.name, rate_iops);
237                                 return 1;
238                         } else {
239                                 rate = ((iops - td->rate_blocks[ddir]) * 1000) / spent;
240                                 if (rate < rate_iops_min ||
241                                     iops < td->rate_blocks[ddir]) {
242                                         log_err("%s: min iops rate %u not met,"
243                                                 " got %lu\n", td->o.name,
244                                                         rate_iops_min, rate);
245                                 }
246                         }
247                 }
248         }
249
250         td->rate_bytes[ddir] = bytes;
251         td->rate_blocks[ddir] = iops;
252         memcpy(&td->lastrate[ddir], now, sizeof(*now));
253         return 0;
254 }
255
256 static int check_min_rate(struct thread_data *td, struct timeval *now,
257                           unsigned long *bytes_done)
258 {
259         int ret = 0;
260
261         if (bytes_done[0])
262                 ret |= __check_min_rate(td, now, 0);
263         if (bytes_done[1])
264                 ret |= __check_min_rate(td, now, 1);
265
266         return ret;
267 }
268
269 static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
270 {
271         if (!td->o.timeout)
272                 return 0;
273         if (mtime_since(&td->epoch, t) >= td->o.timeout * 1000)
274                 return 1;
275
276         return 0;
277 }
278
279 /*
280  * When job exits, we can cancel the in-flight IO if we are using async
281  * io. Attempt to do so.
282  */
283 static void cleanup_pending_aio(struct thread_data *td)
284 {
285         struct flist_head *entry, *n;
286         struct io_u *io_u;
287         int r;
288
289         /*
290          * get immediately available events, if any
291          */
292         r = io_u_queued_complete(td, 0, NULL);
293         if (r < 0)
294                 return;
295
296         /*
297          * now cancel remaining active events
298          */
299         if (td->io_ops->cancel) {
300                 flist_for_each_safe(entry, n, &td->io_u_busylist) {
301                         io_u = flist_entry(entry, struct io_u, list);
302
303                         /*
304                          * if the io_u isn't in flight, then that generally
305                          * means someone leaked an io_u. complain but fix
306                          * it up, so we don't stall here.
307                          */
308                         if ((io_u->flags & IO_U_F_FLIGHT) == 0) {
309                                 log_err("fio: non-busy IO on busy list\n");
310                                 put_io_u(td, io_u);
311                         } else {
312                                 r = td->io_ops->cancel(td, io_u);
313                                 if (!r)
314                                         put_io_u(td, io_u);
315                         }
316                 }
317         }
318
319         if (td->cur_depth)
320                 r = io_u_queued_complete(td, td->cur_depth, NULL);
321 }
322
323 /*
324  * Helper to handle the final sync of a file. Works just like the normal
325  * io path, just does everything sync.
326  */
327 static int fio_io_sync(struct thread_data *td, struct fio_file *f)
328 {
329         struct io_u *io_u = __get_io_u(td);
330         int ret;
331
332         if (!io_u)
333                 return 1;
334
335         io_u->ddir = DDIR_SYNC;
336         io_u->file = f;
337
338         if (td_io_prep(td, io_u)) {
339                 put_io_u(td, io_u);
340                 return 1;
341         }
342
343 requeue:
344         ret = td_io_queue(td, io_u);
345         if (ret < 0) {
346                 td_verror(td, io_u->error, "td_io_queue");
347                 put_io_u(td, io_u);
348                 return 1;
349         } else if (ret == FIO_Q_QUEUED) {
350                 if (io_u_queued_complete(td, 1, NULL) < 0)
351                         return 1;
352         } else if (ret == FIO_Q_COMPLETED) {
353                 if (io_u->error) {
354                         td_verror(td, io_u->error, "td_io_queue");
355                         return 1;
356                 }
357
358                 if (io_u_sync_complete(td, io_u, NULL) < 0)
359                         return 1;
360         } else if (ret == FIO_Q_BUSY) {
361                 if (td_io_commit(td))
362                         return 1;
363                 goto requeue;
364         }
365
366         return 0;
367 }
368
369 static inline void update_tv_cache(struct thread_data *td)
370 {
371         if ((++td->tv_cache_nr & td->tv_cache_mask) == td->tv_cache_mask)
372                 fio_gettime(&td->tv_cache, NULL);
373 }
374
375 /*
376  * The main verify engine. Runs over the writes we previously submitted,
377  * reads the blocks back in, and checks the crc/md5 of the data.
378  */
379 static void do_verify(struct thread_data *td)
380 {
381         struct fio_file *f;
382         struct io_u *io_u;
383         int ret, min_events;
384         unsigned int i;
385
386         /*
387          * sync io first and invalidate cache, to make sure we really
388          * read from disk.
389          */
390         for_each_file(td, f, i) {
391                 if (!fio_file_open(f))
392                         continue;
393                 if (fio_io_sync(td, f))
394                         break;
395                 if (file_invalidate_cache(td, f))
396                         break;
397         }
398
399         if (td->error)
400                 return;
401
402         td_set_runstate(td, TD_VERIFYING);
403
404         io_u = NULL;
405         while (!td->terminate) {
406                 int ret2, full;
407
408                 io_u = __get_io_u(td);
409                 if (!io_u)
410                         break;
411
412                 update_tv_cache(td);
413
414                 if (runtime_exceeded(td, &td->tv_cache)) {
415                         put_io_u(td, io_u);
416                         td->terminate = 1;
417                         break;
418                 }
419
420                 if (get_next_verify(td, io_u)) {
421                         put_io_u(td, io_u);
422                         break;
423                 }
424
425                 if (td_io_prep(td, io_u)) {
426                         put_io_u(td, io_u);
427                         break;
428                 }
429
430                 io_u->end_io = verify_io_u;
431
432                 ret = td_io_queue(td, io_u);
433                 switch (ret) {
434                 case FIO_Q_COMPLETED:
435                         if (io_u->error)
436                                 ret = -io_u->error;
437                         else if (io_u->resid) {
438                                 int bytes = io_u->xfer_buflen - io_u->resid;
439                                 struct fio_file *f = io_u->file;
440
441                                 /*
442                                  * zero read, fail
443                                  */
444                                 if (!bytes) {
445                                         td_verror(td, EIO, "full resid");
446                                         put_io_u(td, io_u);
447                                         break;
448                                 }
449
450                                 io_u->xfer_buflen = io_u->resid;
451                                 io_u->xfer_buf += bytes;
452                                 io_u->offset += bytes;
453
454                                 td->ts.short_io_u[io_u->ddir]++;
455
456                                 if (io_u->offset == f->real_file_size)
457                                         goto sync_done;
458
459                                 requeue_io_u(td, &io_u);
460                         } else {
461 sync_done:
462                                 ret = io_u_sync_complete(td, io_u, NULL);
463                                 if (ret < 0)
464                                         break;
465                         }
466                         continue;
467                 case FIO_Q_QUEUED:
468                         break;
469                 case FIO_Q_BUSY:
470                         requeue_io_u(td, &io_u);
471                         ret2 = td_io_commit(td);
472                         if (ret2 < 0)
473                                 ret = ret2;
474                         break;
475                 default:
476                         assert(ret < 0);
477                         td_verror(td, -ret, "td_io_queue");
478                         break;
479                 }
480
481                 if (ret < 0 || td->error)
482                         break;
483
484                 /*
485                  * if we can queue more, do so. but check if there are
486                  * completed io_u's first.
487                  */
488                 full = queue_full(td) || ret == FIO_Q_BUSY;
489                 if (full || !td->o.iodepth_batch_complete) {
490                         min_events = td->o.iodepth_batch_complete;
491                         if (full && !min_events)
492                                 min_events = 1;
493
494                         do {
495                                 /*
496                                  * Reap required number of io units, if any,
497                                  * and do the verification on them through
498                                  * the callback handler
499                                  */
500                                 if (io_u_queued_complete(td, min_events, NULL) < 0) {
501                                         ret = -1;
502                                         break;
503                                 }
504                         } while (full && (td->cur_depth > td->o.iodepth_low));
505                 }
506                 if (ret < 0)
507                         break;
508         }
509
510         if (!td->error) {
511                 min_events = td->cur_depth;
512
513                 if (min_events)
514                         ret = io_u_queued_complete(td, min_events, NULL);
515         } else
516                 cleanup_pending_aio(td);
517
518         td_set_runstate(td, TD_RUNNING);
519 }
520
521 /*
522  * Main IO worker function. It retrieves io_u's to process and queues
523  * and reaps them, checking for rate and errors along the way.
524  */
525 static void do_io(struct thread_data *td)
526 {
527         unsigned int i;
528         int ret = 0;
529
530         if (in_ramp_time(td))
531                 td_set_runstate(td, TD_RAMP);
532         else
533                 td_set_runstate(td, TD_RUNNING);
534
535         while ((td->this_io_bytes[0] + td->this_io_bytes[1]) < td->o.size) {
536                 struct timeval comp_time;
537                 unsigned long bytes_done[2] = { 0, 0 };
538                 int min_evts = 0;
539                 struct io_u *io_u;
540                 int ret2, full;
541
542                 if (td->terminate)
543                         break;
544
545                 io_u = get_io_u(td);
546                 if (!io_u)
547                         break;
548
549                 update_tv_cache(td);
550
551                 if (runtime_exceeded(td, &td->tv_cache)) {
552                         put_io_u(td, io_u);
553                         td->terminate = 1;
554                         break;
555                 }
556
557                 /*
558                  * Add verification end_io handler, if asked to verify
559                  * a previously written file.
560                  */
561                 if (td->o.verify != VERIFY_NONE && io_u->ddir == DDIR_READ) {
562                         io_u->end_io = verify_io_u;
563                         td_set_runstate(td, TD_VERIFYING);
564                 } else if (in_ramp_time(td))
565                         td_set_runstate(td, TD_RAMP);
566                 else
567                         td_set_runstate(td, TD_RUNNING);
568
569                 ret = td_io_queue(td, io_u);
570                 switch (ret) {
571                 case FIO_Q_COMPLETED:
572                         if (io_u->error)
573                                 ret = -io_u->error;
574                         else if (io_u->resid) {
575                                 int bytes = io_u->xfer_buflen - io_u->resid;
576                                 struct fio_file *f = io_u->file;
577
578                                 /*
579                                  * zero read, fail
580                                  */
581                                 if (!bytes) {
582                                         td_verror(td, EIO, "full resid");
583                                         put_io_u(td, io_u);
584                                         break;
585                                 }
586
587                                 io_u->xfer_buflen = io_u->resid;
588                                 io_u->xfer_buf += bytes;
589                                 io_u->offset += bytes;
590
591                                 td->ts.short_io_u[io_u->ddir]++;
592
593                                 if (io_u->offset == f->real_file_size)
594                                         goto sync_done;
595
596                                 requeue_io_u(td, &io_u);
597                         } else {
598 sync_done:
599                                 if (__should_check_rate(td, 0) ||
600                                     __should_check_rate(td, 1))
601                                         fio_gettime(&comp_time, NULL);
602
603                                 ret = io_u_sync_complete(td, io_u, bytes_done);
604                                 if (ret < 0)
605                                         break;
606                         }
607                         break;
608                 case FIO_Q_QUEUED:
609                         /*
610                          * if the engine doesn't have a commit hook,
611                          * the io_u is really queued. if it does have such
612                          * a hook, it has to call io_u_queued() itself.
613                          */
614                         if (td->io_ops->commit == NULL)
615                                 io_u_queued(td, io_u);
616                         break;
617                 case FIO_Q_BUSY:
618                         requeue_io_u(td, &io_u);
619                         ret2 = td_io_commit(td);
620                         if (ret2 < 0)
621                                 ret = ret2;
622                         break;
623                 default:
624                         assert(ret < 0);
625                         put_io_u(td, io_u);
626                         break;
627                 }
628
629                 if (ret < 0 || td->error)
630                         break;
631
632                 /*
633                  * See if we need to complete some commands
634                  */
635                 full = queue_full(td) || ret == FIO_Q_BUSY;
636                 if (full || !td->o.iodepth_batch_complete) {
637                         min_evts = td->o.iodepth_batch_complete;
638                         if (full && !min_evts)
639                                 min_evts = 1;
640
641                         if (__should_check_rate(td, 0) ||
642                             __should_check_rate(td, 1))
643                                 fio_gettime(&comp_time, NULL);
644
645                         do {
646                                 ret = io_u_queued_complete(td, min_evts, bytes_done);
647                                 if (ret < 0)
648                                         break;
649
650                         } while (full && (td->cur_depth > td->o.iodepth_low));
651                 }
652
653                 if (ret < 0)
654                         break;
655                 if (!(bytes_done[0] + bytes_done[1]))
656                         continue;
657
658                 if (!in_ramp_time(td) && should_check_rate(td, bytes_done)) {
659                         if (check_min_rate(td, &comp_time, bytes_done)) {
660                                 if (exitall_on_terminate)
661                                         terminate_threads(td->groupid);
662                                 td_verror(td, EIO, "check_min_rate");
663                                 break;
664                         }
665                 }
666
667                 if (td->o.thinktime) {
668                         unsigned long long b;
669
670                         b = td->io_blocks[0] + td->io_blocks[1];
671                         if (!(b % td->o.thinktime_blocks)) {
672                                 int left;
673
674                                 if (td->o.thinktime_spin)
675                                         usec_spin(td->o.thinktime_spin);
676
677                                 left = td->o.thinktime - td->o.thinktime_spin;
678                                 if (left)
679                                         usec_sleep(td, left);
680                         }
681                 }
682         }
683
684         if (td->o.fill_device && td->error == ENOSPC) {
685                 td->error = 0;
686                 td->terminate = 1;
687         }
688         if (!td->error) {
689                 struct fio_file *f;
690
691                 i = td->cur_depth;
692                 if (i)
693                         ret = io_u_queued_complete(td, i, NULL);
694
695                 if (should_fsync(td) && td->o.end_fsync) {
696                         td_set_runstate(td, TD_FSYNCING);
697
698                         for_each_file(td, f, i) {
699                                 if (!fio_file_open(f))
700                                         continue;
701                                 fio_io_sync(td, f);
702                         }
703                 }
704         } else
705                 cleanup_pending_aio(td);
706
707         /*
708          * stop job if we failed doing any IO
709          */
710         if ((td->this_io_bytes[0] + td->this_io_bytes[1]) == 0)
711                 td->done = 1;
712 }
713
714 static void cleanup_io_u(struct thread_data *td)
715 {
716         struct flist_head *entry, *n;
717         struct io_u *io_u;
718
719         flist_for_each_safe(entry, n, &td->io_u_freelist) {
720                 io_u = flist_entry(entry, struct io_u, list);
721
722                 flist_del(&io_u->list);
723                 free(io_u);
724         }
725
726         free_io_mem(td);
727 }
728
729 static int init_io_u(struct thread_data *td)
730 {
731         struct io_u *io_u;
732         unsigned int max_bs;
733         int cl_align, i, max_units;
734         char *p;
735
736         max_units = td->o.iodepth;
737         max_bs = max(td->o.max_bs[DDIR_READ], td->o.max_bs[DDIR_WRITE]);
738         td->orig_buffer_size = (unsigned long long) max_bs
739                                         * (unsigned long long) max_units;
740
741         if (td->o.mem_type == MEM_SHMHUGE || td->o.mem_type == MEM_MMAPHUGE) {
742                 unsigned long bs;
743
744                 bs = td->orig_buffer_size + td->o.hugepage_size - 1;
745                 td->orig_buffer_size = bs & ~(td->o.hugepage_size - 1);
746         }
747
748         if (td->orig_buffer_size != (size_t) td->orig_buffer_size) {
749                 log_err("fio: IO memory too large. Reduce max_bs or iodepth\n");
750                 return 1;
751         }
752
753         if (allocate_io_mem(td))
754                 return 1;
755
756         if (td->o.odirect)
757                 p = ALIGN(td->orig_buffer);
758         else
759                 p = td->orig_buffer;
760
761         cl_align = os_cache_line_size();
762
763         for (i = 0; i < max_units; i++) {
764                 void *ptr;
765
766                 if (td->terminate)
767                         return 1;
768
769                 if (posix_memalign(&ptr, cl_align, sizeof(*io_u))) {
770                         log_err("fio: posix_memalign=%s\n", strerror(errno));
771                         break;
772                 }
773
774                 io_u = ptr;
775                 memset(io_u, 0, sizeof(*io_u));
776                 INIT_FLIST_HEAD(&io_u->list);
777
778                 if (!(td->io_ops->flags & FIO_NOIO)) {
779                         io_u->buf = p + max_bs * i;
780
781                         if (td_write(td) && !td->o.refill_buffers)
782                                 io_u_fill_buffer(td, io_u, max_bs);
783                 }
784
785                 io_u->index = i;
786                 io_u->flags = IO_U_F_FREE;
787                 flist_add(&io_u->list, &td->io_u_freelist);
788         }
789
790         return 0;
791 }
792
793 static int switch_ioscheduler(struct thread_data *td)
794 {
795         char tmp[256], tmp2[128];
796         FILE *f;
797         int ret;
798
799         if (td->io_ops->flags & FIO_DISKLESSIO)
800                 return 0;
801
802         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
803
804         f = fopen(tmp, "r+");
805         if (!f) {
806                 if (errno == ENOENT) {
807                         log_err("fio: os or kernel doesn't support IO scheduler"
808                                 " switching\n");
809                         return 0;
810                 }
811                 td_verror(td, errno, "fopen iosched");
812                 return 1;
813         }
814
815         /*
816          * Set io scheduler.
817          */
818         ret = fwrite(td->o.ioscheduler, strlen(td->o.ioscheduler), 1, f);
819         if (ferror(f) || ret != 1) {
820                 td_verror(td, errno, "fwrite");
821                 fclose(f);
822                 return 1;
823         }
824
825         rewind(f);
826
827         /*
828          * Read back and check that the selected scheduler is now the default.
829          */
830         ret = fread(tmp, 1, sizeof(tmp), f);
831         if (ferror(f) || ret < 0) {
832                 td_verror(td, errno, "fread");
833                 fclose(f);
834                 return 1;
835         }
836
837         sprintf(tmp2, "[%s]", td->o.ioscheduler);
838         if (!strstr(tmp, tmp2)) {
839                 log_err("fio: io scheduler %s not found\n", td->o.ioscheduler);
840                 td_verror(td, EINVAL, "iosched_switch");
841                 fclose(f);
842                 return 1;
843         }
844
845         fclose(f);
846         return 0;
847 }
848
849 static int keep_running(struct thread_data *td)
850 {
851         unsigned long long io_done;
852
853         if (td->done)
854                 return 0;
855         if (td->o.time_based)
856                 return 1;
857         if (td->o.loops) {
858                 td->o.loops--;
859                 return 1;
860         }
861
862         io_done = td->io_bytes[DDIR_READ] + td->io_bytes[DDIR_WRITE]
863                         + td->io_skip_bytes;
864         if (io_done < td->o.size)
865                 return 1;
866
867         return 0;
868 }
869
870 static void reset_io_counters(struct thread_data *td)
871 {
872         td->ts.stat_io_bytes[0] = td->ts.stat_io_bytes[1] = 0;
873         td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
874         td->zone_bytes = 0;
875         td->rate_bytes[0] = td->rate_bytes[1] = 0;
876         td->rate_blocks[0] = td->rate_blocks[1] = 0;
877
878         td->last_was_sync = 0;
879
880         /*
881          * reset file done count if we are to start over
882          */
883         if (td->o.time_based || td->o.loops)
884                 td->nr_done_files = 0;
885
886         /*
887          * Set the same seed to get repeatable runs
888          */
889         td_fill_rand_seeds(td);
890 }
891
892 void reset_all_stats(struct thread_data *td)
893 {
894         struct timeval tv;
895         int i;
896
897         reset_io_counters(td);
898
899         for (i = 0; i < 2; i++) {
900                 td->io_bytes[i] = 0;
901                 td->io_blocks[i] = 0;
902                 td->io_issues[i] = 0;
903                 td->ts.total_io_u[i] = 0;
904         }
905         
906         fio_gettime(&tv, NULL);
907         memcpy(&td->epoch, &tv, sizeof(tv));
908         memcpy(&td->start, &tv, sizeof(tv));
909 }
910
911 static void clear_io_state(struct thread_data *td)
912 {
913         struct fio_file *f;
914         unsigned int i;
915
916         reset_io_counters(td);
917
918         close_files(td);
919         for_each_file(td, f, i)
920                 fio_file_clear_done(f);
921 }
922
923 static int exec_string(const char *string)
924 {
925         int ret, newlen = strlen(string) + 1 + 8;
926         char *str;
927
928         str = malloc(newlen);
929         sprintf(str, "sh -c %s", string);
930
931         ret = system(str);
932         if (ret == -1)
933                 log_err("fio: exec of cmd <%s> failed\n", str);
934
935         free(str);
936         return ret;
937 }
938
939 /*
940  * Entry point for the thread based jobs. The process based jobs end up
941  * here as well, after a little setup.
942  */
943 static void *thread_main(void *data)
944 {
945         unsigned long long runtime[2], elapsed;
946         struct thread_data *td = data;
947         int clear_state;
948
949         if (!td->o.use_thread)
950                 setsid();
951
952         td->pid = getpid();
953
954         dprint(FD_PROCESS, "jobs pid=%d started\n", (int) td->pid);
955
956         INIT_FLIST_HEAD(&td->io_u_freelist);
957         INIT_FLIST_HEAD(&td->io_u_busylist);
958         INIT_FLIST_HEAD(&td->io_u_requeues);
959         INIT_FLIST_HEAD(&td->io_log_list);
960         INIT_FLIST_HEAD(&td->io_hist_list);
961         td->io_hist_tree = RB_ROOT;
962
963         td_set_runstate(td, TD_INITIALIZED);
964         dprint(FD_MUTEX, "up startup_mutex\n");
965         fio_mutex_up(startup_mutex);
966         dprint(FD_MUTEX, "wait on td->mutex\n");
967         fio_mutex_down(td->mutex);
968         dprint(FD_MUTEX, "done waiting on td->mutex\n");
969
970         /*
971          * the ->mutex mutex is now no longer used, close it to avoid
972          * eating a file descriptor
973          */
974         fio_mutex_remove(td->mutex);
975
976         /*
977          * May alter parameters that init_io_u() will use, so we need to
978          * do this first.
979          */
980         if (init_iolog(td))
981                 goto err;
982
983         if (init_io_u(td))
984                 goto err;
985
986         if (td->o.cpumask_set && fio_setaffinity(td) == -1) {
987                 td_verror(td, errno, "cpu_set_affinity");
988                 goto err;
989         }
990
991         /*
992          * If we have a gettimeofday() thread, make sure we exclude that
993          * thread from this job
994          */
995         if (td->o.gtod_cpu) {
996                 fio_cpu_clear(&td->o.cpumask, td->o.gtod_cpu);
997                 if (fio_setaffinity(td) == -1) {
998                         td_verror(td, errno, "cpu_set_affinity");
999                         goto err;
1000                 }
1001         }
1002
1003         if (td->ioprio_set) {
1004                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
1005                         td_verror(td, errno, "ioprio_set");
1006                         goto err;
1007                 }
1008         }
1009
1010         if (nice(td->o.nice) == -1) {
1011                 td_verror(td, errno, "nice");
1012                 goto err;
1013         }
1014
1015         if (td->o.ioscheduler && switch_ioscheduler(td))
1016                 goto err;
1017
1018         if (!td->o.create_serialize && setup_files(td))
1019                 goto err;
1020
1021         if (td_io_init(td))
1022                 goto err;
1023
1024         if (init_random_map(td))
1025                 goto err;
1026
1027         if (td->o.exec_prerun) {
1028                 if (exec_string(td->o.exec_prerun))
1029                         goto err;
1030         }
1031
1032         if (td->o.pre_read) {
1033                 if (pre_read_files(td) < 0)
1034                         goto err;
1035         }
1036
1037         fio_gettime(&td->epoch, NULL);
1038         getrusage(RUSAGE_SELF, &td->ts.ru_start);
1039
1040         runtime[0] = runtime[1] = 0;
1041         clear_state = 0;
1042         while (keep_running(td)) {
1043                 fio_gettime(&td->start, NULL);
1044                 memcpy(&td->ts.stat_sample_time, &td->start, sizeof(td->start));
1045                 memcpy(&td->tv_cache, &td->start, sizeof(td->start));
1046
1047                 if (td->o.ratemin[0] || td->o.ratemin[1])
1048                         memcpy(&td->lastrate, &td->ts.stat_sample_time,
1049                                                         sizeof(td->lastrate));
1050
1051                 if (clear_state)
1052                         clear_io_state(td);
1053
1054                 prune_io_piece_log(td);
1055
1056                 do_io(td);
1057
1058                 clear_state = 1;
1059
1060                 if (td_read(td) && td->io_bytes[DDIR_READ]) {
1061                         elapsed = utime_since_now(&td->start);
1062                         runtime[DDIR_READ] += elapsed;
1063                 }
1064                 if (td_write(td) && td->io_bytes[DDIR_WRITE]) {
1065                         elapsed = utime_since_now(&td->start);
1066                         runtime[DDIR_WRITE] += elapsed;
1067                 }
1068
1069                 if (td->error || td->terminate)
1070                         break;
1071
1072                 if (!td->o.do_verify ||
1073                     td->o.verify == VERIFY_NONE ||
1074                     (td->io_ops->flags & FIO_UNIDIR))
1075                         continue;
1076
1077                 clear_io_state(td);
1078
1079                 fio_gettime(&td->start, NULL);
1080
1081                 do_verify(td);
1082
1083                 runtime[DDIR_READ] += utime_since_now(&td->start);
1084
1085                 if (td->error || td->terminate)
1086                         break;
1087         }
1088
1089         update_rusage_stat(td);
1090         td->ts.runtime[0] = (runtime[0] + 999) / 1000;
1091         td->ts.runtime[1] = (runtime[1] + 999) / 1000;
1092         td->ts.total_run_time = mtime_since_now(&td->epoch);
1093         td->ts.io_bytes[0] = td->io_bytes[0];
1094         td->ts.io_bytes[1] = td->io_bytes[1];
1095
1096         fio_mutex_down(writeout_mutex);
1097         if (td->ts.bw_log) {
1098                 if (td->o.bw_log_file) {
1099                         finish_log_named(td, td->ts.bw_log,
1100                                                 td->o.bw_log_file, "bw");
1101                 } else
1102                         finish_log(td, td->ts.bw_log, "bw");
1103         }
1104         if (td->ts.slat_log) {
1105                 if (td->o.lat_log_file) {
1106                         finish_log_named(td, td->ts.slat_log,
1107                                                 td->o.lat_log_file, "slat");
1108                 } else
1109                         finish_log(td, td->ts.slat_log, "slat");
1110         }
1111         if (td->ts.clat_log) {
1112                 if (td->o.lat_log_file) {
1113                         finish_log_named(td, td->ts.clat_log,
1114                                                 td->o.lat_log_file, "clat");
1115                 } else
1116                         finish_log(td, td->ts.clat_log, "clat");
1117         }
1118         fio_mutex_up(writeout_mutex);
1119         if (td->o.exec_postrun)
1120                 exec_string(td->o.exec_postrun);
1121
1122         if (exitall_on_terminate)
1123                 terminate_threads(td->groupid);
1124
1125 err:
1126         if (td->error)
1127                 printf("fio: pid=%d, err=%d/%s\n", (int) td->pid, td->error,
1128                                                         td->verror);
1129         close_and_free_files(td);
1130         close_ioengine(td);
1131         cleanup_io_u(td);
1132
1133         if (td->o.cpumask_set) {
1134                 int ret = fio_cpuset_exit(&td->o.cpumask);
1135
1136                 td_verror(td, ret, "fio_cpuset_exit");
1137         }
1138
1139         /*
1140          * do this very late, it will log file closing as well
1141          */
1142         if (td->o.write_iolog_file)
1143                 write_iolog_close(td);
1144
1145         options_mem_free(td);
1146         td_set_runstate(td, TD_EXITED);
1147         return (void *) (unsigned long) td->error;
1148 }
1149
1150 /*
1151  * We cannot pass the td data into a forked process, so attach the td and
1152  * pass it to the thread worker.
1153  */
1154 static int fork_main(int shmid, int offset)
1155 {
1156         struct thread_data *td;
1157         void *data, *ret;
1158
1159         data = shmat(shmid, NULL, 0);
1160         if (data == (void *) -1) {
1161                 int __err = errno;
1162
1163                 perror("shmat");
1164                 return __err;
1165         }
1166
1167         td = data + offset * sizeof(struct thread_data);
1168         ret = thread_main(td);
1169         shmdt(data);
1170         return (int) (unsigned long) ret;
1171 }
1172
1173 /*
1174  * Run over the job map and reap the threads that have exited, if any.
1175  */
1176 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
1177 {
1178         struct thread_data *td;
1179         int i, cputhreads, realthreads, pending, status, ret;
1180
1181         /*
1182          * reap exited threads (TD_EXITED -> TD_REAPED)
1183          */
1184         realthreads = pending = cputhreads = 0;
1185         for_each_td(td, i) {
1186                 int flags = 0;
1187
1188                 /*
1189                  * ->io_ops is NULL for a thread that has closed its
1190                  * io engine
1191                  */
1192                 if (td->io_ops && !strcmp(td->io_ops->name, "cpuio"))
1193                         cputhreads++;
1194                 else
1195                         realthreads++;
1196
1197                 if (!td->pid) {
1198                         pending++;
1199                         continue;
1200                 }
1201                 if (td->runstate == TD_REAPED)
1202                         continue;
1203                 if (td->o.use_thread) {
1204                         if (td->runstate == TD_EXITED) {
1205                                 td_set_runstate(td, TD_REAPED);
1206                                 goto reaped;
1207                         }
1208                         continue;
1209                 }
1210
1211                 flags = WNOHANG;
1212                 if (td->runstate == TD_EXITED)
1213                         flags = 0;
1214
1215                 /*
1216                  * check if someone quit or got killed in an unusual way
1217                  */
1218                 ret = waitpid(td->pid, &status, flags);
1219                 if (ret < 0) {
1220                         if (errno == ECHILD) {
1221                                 log_err("fio: pid=%d disappeared %d\n",
1222                                                 (int) td->pid, td->runstate);
1223                                 td_set_runstate(td, TD_REAPED);
1224                                 goto reaped;
1225                         }
1226                         perror("waitpid");
1227                 } else if (ret == td->pid) {
1228                         if (WIFSIGNALED(status)) {
1229                                 int sig = WTERMSIG(status);
1230
1231                                 if (sig != SIGQUIT)
1232                                         log_err("fio: pid=%d, got signal=%d\n",
1233                                                         (int) td->pid, sig);
1234                                 td_set_runstate(td, TD_REAPED);
1235                                 goto reaped;
1236                         }
1237                         if (WIFEXITED(status)) {
1238                                 if (WEXITSTATUS(status) && !td->error)
1239                                         td->error = WEXITSTATUS(status);
1240
1241                                 td_set_runstate(td, TD_REAPED);
1242                                 goto reaped;
1243                         }
1244                 }
1245
1246                 /*
1247                  * thread is not dead, continue
1248                  */
1249                 pending++;
1250                 continue;
1251 reaped:
1252                 (*nr_running)--;
1253                 (*m_rate) -= (td->o.ratemin[0] + td->o.ratemin[1]);
1254                 (*t_rate) -= (td->o.rate[0] + td->o.rate[1]);
1255                 if (!td->pid)
1256                         pending--;
1257
1258                 if (td->error)
1259                         exit_value++;
1260
1261                 done_secs += mtime_since_now(&td->epoch) / 1000;
1262         }
1263
1264         if (*nr_running == cputhreads && !pending && realthreads)
1265                 terminate_threads(TERMINATE_ALL);
1266 }
1267
1268 static void *gtod_thread_main(void *data)
1269 {
1270         fio_mutex_up(startup_mutex);
1271
1272         /*
1273          * As long as we have jobs around, update the clock. It would be nice
1274          * to have some way of NOT hammering that CPU with gettimeofday(),
1275          * but I'm not sure what to use outside of a simple CPU nop to relax
1276          * it - we don't want to lose precision.
1277          */
1278         while (threads) {
1279                 fio_gtod_update();
1280                 nop;
1281         }
1282
1283         return NULL;
1284 }
1285
1286 static int fio_start_gtod_thread(void)
1287 {
1288         int ret;
1289
1290         ret = pthread_create(&gtod_thread, NULL, gtod_thread_main, NULL);
1291         if (ret) {
1292                 log_err("Can't create gtod thread: %s\n", strerror(ret));
1293                 return 1;
1294         }
1295
1296         ret = pthread_detach(gtod_thread);
1297         if (ret) {
1298                 log_err("Can't detatch gtod thread: %s\n", strerror(ret));
1299                 return 1;
1300         }
1301
1302         dprint(FD_MUTEX, "wait on startup_mutex\n");
1303         fio_mutex_down(startup_mutex);
1304         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
1305         return 0;
1306 }
1307
1308 /*
1309  * Main function for kicking off and reaping jobs, as needed.
1310  */
1311 static void run_threads(void)
1312 {
1313         struct thread_data *td;
1314         unsigned long spent;
1315         int i, todo, nr_running, m_rate, t_rate, nr_started;
1316
1317         if (fio_pin_memory())
1318                 return;
1319
1320         if (fio_gtod_offload && fio_start_gtod_thread())
1321                 return;
1322
1323         if (!terse_output) {
1324                 printf("Starting ");
1325                 if (nr_thread)
1326                         printf("%d thread%s", nr_thread,
1327                                                 nr_thread > 1 ? "s" : "");
1328                 if (nr_process) {
1329                         if (nr_thread)
1330                                 printf(" and ");
1331                         printf("%d process%s", nr_process,
1332                                                 nr_process > 1 ? "es" : "");
1333                 }
1334                 printf("\n");
1335                 fflush(stdout);
1336         }
1337
1338         set_sig_handlers();
1339
1340         todo = thread_number;
1341         nr_running = 0;
1342         nr_started = 0;
1343         m_rate = t_rate = 0;
1344
1345         for_each_td(td, i) {
1346                 print_status_init(td->thread_number - 1);
1347
1348                 if (!td->o.create_serialize) {
1349                         init_disk_util(td);
1350                         continue;
1351                 }
1352
1353                 /*
1354                  * do file setup here so it happens sequentially,
1355                  * we don't want X number of threads getting their
1356                  * client data interspersed on disk
1357                  */
1358                 if (setup_files(td)) {
1359                         exit_value++;
1360                         if (td->error)
1361                                 log_err("fio: pid=%d, err=%d/%s\n",
1362                                         (int) td->pid, td->error, td->verror);
1363                         td_set_runstate(td, TD_REAPED);
1364                         todo--;
1365                 } else {
1366                         struct fio_file *f;
1367                         unsigned int i;
1368
1369                         /*
1370                          * for sharing to work, each job must always open
1371                          * its own files. so close them, if we opened them
1372                          * for creation
1373                          */
1374                         for_each_file(td, f, i) {
1375                                 if (fio_file_open(f))
1376                                         td_io_close_file(td, f);
1377                         }
1378                 }
1379
1380                 init_disk_util(td);
1381         }
1382
1383         set_genesis_time();
1384
1385         while (todo) {
1386                 struct thread_data *map[MAX_JOBS];
1387                 struct timeval this_start;
1388                 int this_jobs = 0, left;
1389
1390                 /*
1391                  * create threads (TD_NOT_CREATED -> TD_CREATED)
1392                  */
1393                 for_each_td(td, i) {
1394                         if (td->runstate != TD_NOT_CREATED)
1395                                 continue;
1396
1397                         /*
1398                          * never got a chance to start, killed by other
1399                          * thread for some reason
1400                          */
1401                         if (td->terminate) {
1402                                 todo--;
1403                                 continue;
1404                         }
1405
1406                         if (td->o.start_delay) {
1407                                 spent = mtime_since_genesis();
1408
1409                                 if (td->o.start_delay * 1000 > spent)
1410                                         continue;
1411                         }
1412
1413                         if (td->o.stonewall && (nr_started || nr_running)) {
1414                                 dprint(FD_PROCESS, "%s: stonewall wait\n",
1415                                                         td->o.name);
1416                                 break;
1417                         }
1418
1419                         /*
1420                          * Set state to created. Thread will transition
1421                          * to TD_INITIALIZED when it's done setting up.
1422                          */
1423                         td_set_runstate(td, TD_CREATED);
1424                         map[this_jobs++] = td;
1425                         nr_started++;
1426
1427                         if (td->o.use_thread) {
1428                                 int ret;
1429
1430                                 dprint(FD_PROCESS, "will pthread_create\n");
1431                                 ret = pthread_create(&td->thread, NULL,
1432                                                         thread_main, td);
1433                                 if (ret) {
1434                                         log_err("pthread_create: %s\n",
1435                                                         strerror(ret));
1436                                         nr_started--;
1437                                         break;
1438                                 }
1439                                 ret = pthread_detach(td->thread);
1440                                 if (ret)
1441                                         log_err("pthread_detach: %s",
1442                                                         strerror(ret));
1443                         } else {
1444                                 pid_t pid;
1445                                 dprint(FD_PROCESS, "will fork\n");
1446                                 pid = fork();
1447                                 if (!pid) {
1448                                         int ret = fork_main(shm_id, i);
1449
1450                                         _exit(ret);
1451                                 } else if (i == fio_debug_jobno)
1452                                         *fio_debug_jobp = pid;
1453                         }
1454                         dprint(FD_MUTEX, "wait on startup_mutex\n");
1455                         fio_mutex_down(startup_mutex);
1456                         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
1457                 }
1458
1459                 /*
1460                  * Wait for the started threads to transition to
1461                  * TD_INITIALIZED.
1462                  */
1463                 fio_gettime(&this_start, NULL);
1464                 left = this_jobs;
1465                 while (left && !fio_abort) {
1466                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1467                                 break;
1468
1469                         usleep(100000);
1470
1471                         for (i = 0; i < this_jobs; i++) {
1472                                 td = map[i];
1473                                 if (!td)
1474                                         continue;
1475                                 if (td->runstate == TD_INITIALIZED) {
1476                                         map[i] = NULL;
1477                                         left--;
1478                                 } else if (td->runstate >= TD_EXITED) {
1479                                         map[i] = NULL;
1480                                         left--;
1481                                         todo--;
1482                                         nr_running++; /* work-around... */
1483                                 }
1484                         }
1485                 }
1486
1487                 if (left) {
1488                         log_err("fio: %d jobs failed to start\n", left);
1489                         for (i = 0; i < this_jobs; i++) {
1490                                 td = map[i];
1491                                 if (!td)
1492                                         continue;
1493                                 kill(td->pid, SIGTERM);
1494                         }
1495                         break;
1496                 }
1497
1498                 /*
1499                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1500                  */
1501                 for_each_td(td, i) {
1502                         if (td->runstate != TD_INITIALIZED)
1503                                 continue;
1504
1505                         if (in_ramp_time(td))
1506                                 td_set_runstate(td, TD_RAMP);
1507                         else
1508                                 td_set_runstate(td, TD_RUNNING);
1509                         nr_running++;
1510                         nr_started--;
1511                         m_rate += td->o.ratemin[0] + td->o.ratemin[1];
1512                         t_rate += td->o.rate[0] + td->o.rate[1];
1513                         todo--;
1514                         fio_mutex_up(td->mutex);
1515                 }
1516
1517                 reap_threads(&nr_running, &t_rate, &m_rate);
1518
1519                 if (todo)
1520                         usleep(100000);
1521         }
1522
1523         while (nr_running) {
1524                 reap_threads(&nr_running, &t_rate, &m_rate);
1525                 usleep(10000);
1526         }
1527
1528         update_io_ticks();
1529         fio_unpin_memory();
1530 }
1531
1532 int main(int argc, char *argv[])
1533 {
1534         long ps;
1535
1536         sinit();
1537
1538         /*
1539          * We need locale for number printing, if it isn't set then just
1540          * go with the US format.
1541          */
1542         if (!getenv("LC_NUMERIC"))
1543                 setlocale(LC_NUMERIC, "en_US");
1544
1545         if (parse_options(argc, argv))
1546                 return 1;
1547
1548         if (!thread_number)
1549                 return 0;
1550
1551         ps = sysconf(_SC_PAGESIZE);
1552         if (ps < 0) {
1553                 log_err("Failed to get page size\n");
1554                 return 1;
1555         }
1556
1557         page_size = ps;
1558         page_mask = ps - 1;
1559
1560         if (write_bw_log) {
1561                 setup_log(&agg_io_log[DDIR_READ]);
1562                 setup_log(&agg_io_log[DDIR_WRITE]);
1563         }
1564
1565         startup_mutex = fio_mutex_init(0);
1566         writeout_mutex = fio_mutex_init(1);
1567
1568         set_genesis_time();
1569
1570         status_timer_arm();
1571
1572         run_threads();
1573
1574         if (!fio_abort) {
1575                 show_run_stats();
1576                 if (write_bw_log) {
1577                         __finish_log(agg_io_log[DDIR_READ], "agg-read_bw.log");
1578                         __finish_log(agg_io_log[DDIR_WRITE],
1579                                         "agg-write_bw.log");
1580                 }
1581         }
1582
1583         fio_mutex_remove(startup_mutex);
1584         fio_mutex_remove(writeout_mutex);
1585         return exit_value;
1586 }