->getevents() should take unsigned args
[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
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], elapsed;
791         struct thread_data *td = data;
792         int clear_state;
793
794         if (!td->o.use_thread)
795                 setsid();
796
797         td->pid = getpid();
798
799         INIT_LIST_HEAD(&td->io_u_freelist);
800         INIT_LIST_HEAD(&td->io_u_busylist);
801         INIT_LIST_HEAD(&td->io_u_requeues);
802         INIT_LIST_HEAD(&td->io_log_list);
803         INIT_LIST_HEAD(&td->io_hist_list);
804         td->io_hist_tree = RB_ROOT;
805
806         td_set_runstate(td, TD_INITIALIZED);
807         fio_sem_up(startup_sem);
808         fio_sem_down(td->mutex);
809
810         /*
811          * the ->mutex semaphore is now no longer used, close it to avoid
812          * eating a file descriptor
813          */
814         fio_sem_remove(td->mutex);
815
816         /*
817          * May alter parameters that init_io_u() will use, so we need to
818          * do this first.
819          */
820         if (init_iolog(td))
821                 goto err;
822
823         if (init_io_u(td))
824                 goto err;
825
826         if (td->o.cpumask_set && fio_setaffinity(td) == -1) {
827                 td_verror(td, errno, "cpu_set_affinity");
828                 goto err;
829         }
830
831         if (td->ioprio_set) {
832                 if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
833                         td_verror(td, errno, "ioprio_set");
834                         goto err;
835                 }
836         }
837
838         if (nice(td->o.nice) == -1) {
839                 td_verror(td, errno, "nice");
840                 goto err;
841         }
842
843         if (td->o.ioscheduler && switch_ioscheduler(td))
844                 goto err;
845
846         if (!td->o.create_serialize && setup_files(td))
847                 goto err;
848
849         if (td_io_init(td))
850                 goto err;
851
852         if (open_files(td))
853                 goto err;
854
855         if (init_random_map(td))
856                 goto err;
857
858         if (td->o.exec_prerun) {
859                 if (system(td->o.exec_prerun) < 0)
860                         goto err;
861         }
862
863         fio_gettime(&td->epoch, NULL);
864         memcpy(&td->timeout_end, &td->epoch, sizeof(td->epoch));
865         getrusage(RUSAGE_SELF, &td->ts.ru_start);
866
867         runtime[0] = runtime[1] = 0;
868         clear_state = 0;
869         while (keep_running(td)) {
870                 fio_gettime(&td->start, NULL);
871                 memcpy(&td->ts.stat_sample_time, &td->start, sizeof(td->start));
872
873                 if (td->o.ratemin)
874                         memcpy(&td->lastrate, &td->ts.stat_sample_time, sizeof(td->lastrate));
875
876                 if (clear_state && clear_io_state(td))
877                         break;
878
879                 prune_io_piece_log(td);
880
881                 do_io(td);
882
883                 clear_state = 1;
884
885                 if (td_read(td) && td->io_bytes[DDIR_READ]) {
886                         if (td->rw_end_set[DDIR_READ])
887                                 elapsed = utime_since(&td->start, &td->rw_end[DDIR_READ]);
888                         else
889                                 elapsed = utime_since_now(&td->start);
890
891                         runtime[DDIR_READ] += elapsed;
892                 }
893                 if (td_write(td) && td->io_bytes[DDIR_WRITE]) {
894                         if (td->rw_end_set[DDIR_WRITE])
895                                 elapsed = utime_since(&td->start, &td->rw_end[DDIR_WRITE]);
896                         else
897                                 elapsed = utime_since_now(&td->start);
898
899                         runtime[DDIR_WRITE] += elapsed;
900                 }
901                 
902                 if (td->error || td->terminate)
903                         break;
904
905                 if (!td->o.do_verify ||
906                     td->o.verify == VERIFY_NONE ||
907                     (td->io_ops->flags & FIO_UNIDIR))
908                         continue;
909
910                 if (clear_io_state(td))
911                         break;
912
913                 fio_gettime(&td->start, NULL);
914
915                 do_verify(td);
916
917                 runtime[DDIR_READ] += utime_since_now(&td->start);
918
919                 if (td->error || td->terminate)
920                         break;
921         }
922
923         update_rusage_stat(td);
924         td->ts.runtime[0] = (runtime[0] + 999) / 1000;
925         td->ts.runtime[1] = (runtime[1] + 999) / 1000;
926         td->ts.total_run_time = mtime_since_now(&td->epoch);
927         td->ts.io_bytes[0] = td->io_bytes[0];
928         td->ts.io_bytes[1] = td->io_bytes[1];
929
930         if (td->ts.bw_log)
931                 finish_log(td, td->ts.bw_log, "bw");
932         if (td->ts.slat_log)
933                 finish_log(td, td->ts.slat_log, "slat");
934         if (td->ts.clat_log)
935                 finish_log(td, td->ts.clat_log, "clat");
936         if (td->o.exec_postrun) {
937                 if (system(td->o.exec_postrun) < 0)
938                         log_err("fio: postrun %s failed\n", td->o.exec_postrun);
939         }
940
941         if (exitall_on_terminate)
942                 terminate_threads(td->groupid);
943
944 err:
945         if (td->error)
946                 printf("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
947         close_files(td);
948         close_ioengine(td);
949         cleanup_io_u(td);
950
951         /*
952          * do this very late, it will log file closing as well
953          */
954         if (td->o.write_iolog_file)
955                 write_iolog_close(td);
956
957         options_mem_free(td);
958         td_set_runstate(td, TD_EXITED);
959         return (void *) (unsigned long) td->error;
960 }
961
962 /*
963  * We cannot pass the td data into a forked process, so attach the td and
964  * pass it to the thread worker.
965  */
966 static int fork_main(int shmid, int offset)
967 {
968         struct thread_data *td;
969         void *data, *ret;
970
971         data = shmat(shmid, NULL, 0);
972         if (data == (void *) -1) {
973                 int __err = errno;
974
975                 perror("shmat");
976                 return __err;
977         }
978
979         td = data + offset * sizeof(struct thread_data);
980         ret = thread_main(td);
981         shmdt(data);
982         return (int) (unsigned long) ret;
983 }
984
985 /*
986  * Run over the job map and reap the threads that have exited, if any.
987  */
988 static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
989 {
990         struct thread_data *td;
991         int i, cputhreads, realthreads, pending, status, ret;
992
993         /*
994          * reap exited threads (TD_EXITED -> TD_REAPED)
995          */
996         realthreads = pending = cputhreads = 0;
997         for_each_td(td, i) {
998                 int flags = 0;
999
1000                 /*
1001                  * ->io_ops is NULL for a thread that has closed its
1002                  * io engine
1003                  */
1004                 if (td->io_ops && !strcmp(td->io_ops->name, "cpuio"))
1005                         cputhreads++;
1006                 else
1007                         realthreads++;
1008
1009                 if (!td->pid || td->runstate == TD_REAPED)
1010                         continue;
1011                 if (td->o.use_thread) {
1012                         if (td->runstate == TD_EXITED) {
1013                                 td_set_runstate(td, TD_REAPED);
1014                                 goto reaped;
1015                         }
1016                         continue;
1017                 }
1018
1019                 flags = WNOHANG;
1020                 if (td->runstate == TD_EXITED)
1021                         flags = 0;
1022
1023                 /*
1024                  * check if someone quit or got killed in an unusual way
1025                  */
1026                 ret = waitpid(td->pid, &status, flags);
1027                 if (ret < 0) {
1028                         if (errno == ECHILD) {
1029                                 log_err("fio: pid=%d disappeared %d\n", td->pid, td->runstate);
1030                                 td_set_runstate(td, TD_REAPED);
1031                                 goto reaped;
1032                         }
1033                         perror("waitpid");
1034                 } else if (ret == td->pid) {
1035                         if (WIFSIGNALED(status)) {
1036                                 int sig = WTERMSIG(status);
1037
1038                                 if (sig != SIGQUIT)
1039                                         log_err("fio: pid=%d, got signal=%d\n", td->pid, sig);
1040                                 td_set_runstate(td, TD_REAPED);
1041                                 goto reaped;
1042                         }
1043                         if (WIFEXITED(status)) {
1044                                 if (WEXITSTATUS(status) && !td->error)
1045                                         td->error = WEXITSTATUS(status);
1046
1047                                 td_set_runstate(td, TD_REAPED);
1048                                 goto reaped;
1049                         }
1050                 }
1051
1052                 /*
1053                  * thread is not dead, continue
1054                  */
1055                 pending++;
1056                 continue;
1057 reaped:
1058                 if (td->o.use_thread) {
1059                         long ret;
1060
1061                         if (pthread_join(td->thread, (void *) &ret))
1062                                 perror("pthread_join");
1063                 }
1064
1065                 (*nr_running)--;
1066                 (*m_rate) -= td->o.ratemin;
1067                 (*t_rate) -= td->o.rate;
1068                 pending--;
1069
1070                 if (td->error)
1071                         exit_value++;
1072         }
1073
1074         if (*nr_running == cputhreads && !pending && realthreads)
1075                 terminate_threads(TERMINATE_ALL);
1076 }
1077
1078 /*
1079  * Main function for kicking off and reaping jobs, as needed.
1080  */
1081 static void run_threads(void)
1082 {
1083         struct thread_data *td;
1084         unsigned long spent;
1085         int i, todo, nr_running, m_rate, t_rate, nr_started;
1086
1087         if (fio_pin_memory())
1088                 return;
1089
1090         if (!terse_output) {
1091                 printf("Starting ");
1092                 if (nr_thread)
1093                         printf("%d thread%s", nr_thread, nr_thread > 1 ? "s" : "");
1094                 if (nr_process) {
1095                         if (nr_thread)
1096                                 printf(" and ");
1097                         printf("%d process%s", nr_process, nr_process > 1 ? "es" : "");
1098                 }
1099                 printf("\n");
1100                 fflush(stdout);
1101         }
1102
1103         signal(SIGINT, sig_handler);
1104         signal(SIGALRM, sig_handler);
1105
1106         todo = thread_number;
1107         nr_running = 0;
1108         nr_started = 0;
1109         m_rate = t_rate = 0;
1110
1111         for_each_td(td, i) {
1112                 print_status_init(td->thread_number - 1);
1113
1114                 if (!td->o.create_serialize) {
1115                         init_disk_util(td);
1116                         continue;
1117                 }
1118
1119                 /*
1120                  * do file setup here so it happens sequentially,
1121                  * we don't want X number of threads getting their
1122                  * client data interspersed on disk
1123                  */
1124                 if (setup_files(td)) {
1125                         exit_value++;
1126                         if (td->error)
1127                                 log_err("fio: pid=%d, err=%d/%s\n", td->pid, td->error, td->verror);
1128                         td_set_runstate(td, TD_REAPED);
1129                         todo--;
1130                 }
1131
1132                 init_disk_util(td);
1133         }
1134
1135         set_genesis_time();
1136
1137         while (todo) {
1138                 struct thread_data *map[MAX_JOBS];
1139                 struct timeval this_start;
1140                 int this_jobs = 0, left;
1141
1142                 /*
1143                  * create threads (TD_NOT_CREATED -> TD_CREATED)
1144                  */
1145                 for_each_td(td, i) {
1146                         if (td->runstate != TD_NOT_CREATED)
1147                                 continue;
1148
1149                         /*
1150                          * never got a chance to start, killed by other
1151                          * thread for some reason
1152                          */
1153                         if (td->terminate) {
1154                                 todo--;
1155                                 continue;
1156                         }
1157
1158                         if (td->o.start_delay) {
1159                                 spent = mtime_since_genesis();
1160
1161                                 if (td->o.start_delay * 1000 > spent)
1162                                         continue;
1163                         }
1164
1165                         if (td->o.stonewall && (nr_started || nr_running))
1166                                 break;
1167
1168                         /*
1169                          * Set state to created. Thread will transition
1170                          * to TD_INITIALIZED when it's done setting up.
1171                          */
1172                         td_set_runstate(td, TD_CREATED);
1173                         map[this_jobs++] = td;
1174                         nr_started++;
1175
1176                         if (td->o.use_thread) {
1177                                 if (pthread_create(&td->thread, NULL, thread_main, td)) {
1178                                         perror("thread_create");
1179                                         nr_started--;
1180                                         break;
1181                                 }
1182                         } else {
1183                                 if (!fork()) {
1184                                         int ret = fork_main(shm_id, i);
1185
1186                                         exit(ret);
1187                                 }
1188                         }
1189                         fio_sem_down(startup_sem);
1190                 }
1191
1192                 /*
1193                  * Wait for the started threads to transition to
1194                  * TD_INITIALIZED.
1195                  */
1196                 fio_gettime(&this_start, NULL);
1197                 left = this_jobs;
1198                 while (left && !fio_abort) {
1199                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
1200                                 break;
1201
1202                         usleep(100000);
1203
1204                         for (i = 0; i < this_jobs; i++) {
1205                                 td = map[i];
1206                                 if (!td)
1207                                         continue;
1208                                 if (td->runstate == TD_INITIALIZED) {
1209                                         map[i] = NULL;
1210                                         left--;
1211                                 } else if (td->runstate >= TD_EXITED) {
1212                                         map[i] = NULL;
1213                                         left--;
1214                                         todo--;
1215                                         nr_running++; /* work-around... */
1216                                 }
1217                         }
1218                 }
1219
1220                 if (left) {
1221                         log_err("fio: %d jobs failed to start\n", left);
1222                         for (i = 0; i < this_jobs; i++) {
1223                                 td = map[i];
1224                                 if (!td)
1225                                         continue;
1226                                 kill(td->pid, SIGTERM);
1227                         }
1228                         break;
1229                 }
1230
1231                 /*
1232                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
1233                  */
1234                 for_each_td(td, i) {
1235                         if (td->runstate != TD_INITIALIZED)
1236                                 continue;
1237
1238                         td_set_runstate(td, TD_RUNNING);
1239                         nr_running++;
1240                         nr_started--;
1241                         m_rate += td->o.ratemin;
1242                         t_rate += td->o.rate;
1243                         todo--;
1244                         fio_sem_up(td->mutex);
1245                 }
1246
1247                 reap_threads(&nr_running, &t_rate, &m_rate);
1248
1249                 if (todo)
1250                         usleep(100000);
1251         }
1252
1253         while (nr_running) {
1254                 reap_threads(&nr_running, &t_rate, &m_rate);
1255                 usleep(10000);
1256         }
1257
1258         update_io_ticks();
1259         fio_unpin_memory();
1260 }
1261
1262 int main(int argc, char *argv[])
1263 {
1264         long ps;
1265
1266         /*
1267          * We need locale for number printing, if it isn't set then just
1268          * go with the US format.
1269          */
1270         if (!getenv("LC_NUMERIC"))
1271                 setlocale(LC_NUMERIC, "en_US");
1272
1273         if (parse_options(argc, argv))
1274                 return 1;
1275
1276         if (!thread_number)
1277                 return 0;
1278
1279         ps = sysconf(_SC_PAGESIZE);
1280         if (ps < 0) {
1281                 log_err("Failed to get page size\n");
1282                 return 1;
1283         }
1284
1285         page_size = ps;
1286         page_mask = ps - 1;
1287
1288         if (write_bw_log) {
1289                 setup_log(&agg_io_log[DDIR_READ]);
1290                 setup_log(&agg_io_log[DDIR_WRITE]);
1291         }
1292
1293         startup_sem = fio_sem_init(0);
1294
1295         set_genesis_time();
1296
1297         disk_util_timer_arm();
1298
1299         run_threads();
1300
1301         if (!fio_abort) {
1302                 show_run_stats();
1303                 if (write_bw_log) {
1304                         __finish_log(agg_io_log[DDIR_READ],"agg-read_bw.log");
1305                         __finish_log(agg_io_log[DDIR_WRITE],"agg-write_bw.log");
1306                 }
1307         }
1308
1309         fio_sem_remove(startup_sem);
1310         return exit_value;
1311 }