11 * Change this define to play with the timeout handling
13 #undef FIO_USE_TIMEOUT
15 struct io_completion_data {
18 int error; /* output */
19 unsigned long bytes_done[2]; /* output */
20 struct timeval time; /* output */
24 * The ->file_map[] contains a map of blocks we have or have not done io
25 * to yet. Used to make sure we cover the entire range in a fair fashion.
27 static int random_map_free(struct thread_data *td, struct fio_file *f,
28 unsigned long long block)
30 unsigned int idx = RAND_MAP_IDX(td, f, block);
31 unsigned int bit = RAND_MAP_BIT(td, f, block);
33 return (f->file_map[idx] & (1UL << bit)) == 0;
37 * Mark a given offset as used in the map.
39 static void mark_random_map(struct thread_data *td, struct io_u *io_u)
41 unsigned int min_bs = td->o.rw_min_bs;
42 struct fio_file *f = io_u->file;
43 unsigned long long block;
45 unsigned int nr_blocks;
47 block = io_u->offset / (unsigned long long) min_bs;
49 nr_blocks = (io_u->buflen + min_bs - 1) / min_bs;
51 while (blocks < nr_blocks) {
52 unsigned int idx, bit;
55 * If we have a mixed random workload, we may
56 * encounter blocks we already did IO to.
58 if (!td->o.ddir_nr && !random_map_free(td, f, block))
61 idx = RAND_MAP_IDX(td, f, block);
62 bit = RAND_MAP_BIT(td, f, block);
64 fio_assert(td, idx < f->num_maps);
66 f->file_map[idx] |= (1UL << bit);
71 if ((blocks * min_bs) < io_u->buflen)
72 io_u->buflen = blocks * min_bs;
76 * Return the next free block in the map.
78 static int get_next_free_block(struct thread_data *td, struct fio_file *f,
79 unsigned long long *b)
83 i = f->last_free_lookup;
84 *b = (i * BLOCKS_PER_MAP);
85 while ((*b) * td->o.rw_min_bs < f->real_file_size) {
86 if (f->file_map[i] != -1UL) {
87 *b += fio_ffz(f->file_map[i]);
88 f->last_free_lookup = i;
99 static int get_next_rand_offset(struct thread_data *td, struct fio_file *f,
100 int ddir, unsigned long long *b)
102 unsigned long long max_blocks = f->io_size / td->o.min_bs[ddir];
103 unsigned long long r, rb;
107 r = os_random_long(&td->random_state);
111 *b = ((max_blocks - 1) * r / (unsigned long long) (RAND_MAX+1.0));
113 * if we are not maintaining a random map, we are done.
115 if (td->o.norandommap)
119 * calculate map offset and chec if it's free
121 rb = *b + (f->file_offset / td->o.min_bs[ddir]);
122 if (random_map_free(td, f, rb))
128 * we get here, if we didn't suceed in looking up a block. generate
129 * a random start offset into the filemap, and find the first free
134 f->last_free_lookup = (f->num_maps - 1) * (r / (RAND_MAX+1.0));
135 if (!get_next_free_block(td, f, b))
138 r = os_random_long(&td->random_state);
142 * that didn't work either, try exhaustive search from the start
144 f->last_free_lookup = 0;
145 return get_next_free_block(td, f, b);
149 * For random io, generate a random new block and see if it's used. Repeat
150 * until we find a free one. For sequential io, just return the end of
151 * the last io issued.
153 static int get_next_offset(struct thread_data *td, struct io_u *io_u)
155 struct fio_file *f = io_u->file;
156 const int ddir = io_u->ddir;
157 unsigned long long b;
159 if (td_random(td) && (td->o.ddir_nr && !--td->ddir_nr)) {
160 td->ddir_nr = td->o.ddir_nr;
162 if (get_next_rand_offset(td, f, ddir, &b))
165 if (f->last_pos >= f->real_file_size)
168 b = f->last_pos / td->o.min_bs[ddir];
171 io_u->offset = (b * td->o.min_bs[ddir]) + f->file_offset;
172 if (io_u->offset >= f->real_file_size)
178 static unsigned int get_next_buflen(struct thread_data *td, struct io_u *io_u)
180 const int ddir = io_u->ddir;
184 if (td->o.min_bs[ddir] == td->o.max_bs[ddir])
185 buflen = td->o.min_bs[ddir];
187 r = os_random_long(&td->bsrange_state);
188 buflen = (unsigned int) (1 + (double) (td->o.max_bs[ddir] - 1) * r / (RAND_MAX + 1.0));
189 if (!td->o.bs_unaligned)
190 buflen = (buflen + td->o.min_bs[ddir] - 1) & ~(td->o.min_bs[ddir] - 1);
196 static void set_rwmix_bytes(struct thread_data *td)
198 unsigned long long rbytes;
202 * we do time or byte based switch. this is needed because
203 * buffered writes may issue a lot quicker than they complete,
204 * whereas reads do not.
206 rbytes = td->io_bytes[td->rwmix_ddir] - td->rwmix_bytes;
207 diff = td->o.rwmix[td->rwmix_ddir ^ 1];
209 td->rwmix_bytes = td->io_bytes[td->rwmix_ddir] + (rbytes * ((100 - diff)) / diff);
212 static inline enum fio_ddir get_rand_ddir(struct thread_data *td)
217 r = os_random_long(&td->rwmix_state);
218 v = 1 + (int) (100.0 * (r / (RAND_MAX + 1.0)));
219 if (v < td->o.rwmix[DDIR_READ])
226 * Return the data direction for the next io_u. If the job is a
227 * mixed read/write workload, check the rwmix cycle and switch if
230 static enum fio_ddir get_rw_ddir(struct thread_data *td)
234 unsigned long elapsed;
237 fio_gettime(&now, NULL);
238 elapsed = mtime_since_now(&td->rwmix_switch);
241 * if this is the first cycle, make it shorter
243 cycle = td->o.rwmixcycle;
244 if (!td->rwmix_bytes)
248 * Check if it's time to seed a new data direction.
250 if (elapsed >= cycle ||
251 td->io_bytes[td->rwmix_ddir] >= td->rwmix_bytes) {
252 unsigned long long max_bytes;
256 * Put a top limit on how many bytes we do for
257 * one data direction, to avoid overflowing the
260 ddir = get_rand_ddir(td);
261 max_bytes = td->this_io_bytes[ddir];
262 if (max_bytes >= (td->o.size * td->o.rwmix[ddir] / 100)) {
263 if (!td->rw_end_set[ddir]) {
264 td->rw_end_set[ddir] = 1;
265 memcpy(&td->rw_end[ddir], &now, sizeof(now));
270 if (ddir != td->rwmix_ddir)
273 td->rwmix_ddir = ddir;
274 memcpy(&td->rwmix_switch, &now, sizeof(now));
276 return td->rwmix_ddir;
277 } else if (td_read(td))
283 void put_io_u(struct thread_data *td, struct io_u *io_u)
285 assert((io_u->flags & IO_U_F_FREE) == 0);
286 io_u->flags |= IO_U_F_FREE;
289 put_file(td, io_u->file);
292 list_del(&io_u->list);
293 list_add(&io_u->list, &td->io_u_freelist);
297 void requeue_io_u(struct thread_data *td, struct io_u **io_u)
299 struct io_u *__io_u = *io_u;
301 __io_u->flags |= IO_U_F_FREE;
302 __io_u->flags &= ~IO_U_F_FLIGHT;
304 list_del(&__io_u->list);
305 list_add_tail(&__io_u->list, &td->io_u_requeues);
310 static int fill_io_u(struct thread_data *td, struct io_u *io_u)
313 * If using an iolog, grab next piece if any available.
315 if (td->o.read_iolog_file)
316 return read_iolog_get(td, io_u);
319 * see if it's time to sync
321 if (td->o.fsync_blocks &&
322 !(td->io_issues[DDIR_WRITE] % td->o.fsync_blocks) &&
323 td->io_issues[DDIR_WRITE] && should_fsync(td)) {
324 io_u->ddir = DDIR_SYNC;
328 io_u->ddir = get_rw_ddir(td);
331 * No log, let the seq/rand engine retrieve the next buflen and
334 if (get_next_offset(td, io_u))
337 io_u->buflen = get_next_buflen(td, io_u);
342 * mark entry before potentially trimming io_u
344 if (td_random(td) && !td->o.norandommap)
345 mark_random_map(td, io_u);
348 * If using a write iolog, store this entry.
351 if (td->o.write_iolog_file)
352 write_iolog_put(td, io_u);
357 void io_u_mark_depth(struct thread_data *td, struct io_u *io_u)
361 if (io_u->ddir == DDIR_SYNC)
364 switch (td->cur_depth) {
381 td->ts.io_u_map[index]++;
382 td->ts.total_io_u[io_u->ddir]++;
385 static void io_u_mark_latency(struct thread_data *td, unsigned long msec)
416 td->ts.io_u_lat[index]++;
420 * Get next file to service by choosing one at random
422 static struct fio_file *get_next_file_rand(struct thread_data *td, int goodf,
429 long r = os_random_long(&td->next_file_state);
431 fno = (unsigned int) ((double) td->o.nr_files * (r / (RAND_MAX + 1.0)));
433 if (f->flags & FIO_FILE_DONE)
436 if ((!goodf || (f->flags & goodf)) && !(f->flags & badf))
442 * Get next file to service by doing round robin between all available ones
444 static struct fio_file *get_next_file_rr(struct thread_data *td, int goodf,
447 unsigned int old_next_file = td->next_file;
451 f = &td->files[td->next_file];
454 if (td->next_file >= td->o.nr_files)
457 if (f->flags & FIO_FILE_DONE) {
462 if ((!goodf || (f->flags & goodf)) && !(f->flags & badf))
466 } while (td->next_file != old_next_file);
471 static struct fio_file *get_next_file(struct thread_data *td)
475 assert(td->o.nr_files <= td->files_index);
477 if (!td->nr_open_files || td->nr_done_files >= td->o.nr_files)
480 f = td->file_service_file;
481 if (f && (f->flags & FIO_FILE_OPEN) && td->file_service_left--)
484 if (td->o.file_service_type == FIO_FSERVICE_RR)
485 f = get_next_file_rr(td, FIO_FILE_OPEN, FIO_FILE_CLOSING);
487 f = get_next_file_rand(td, FIO_FILE_OPEN, FIO_FILE_CLOSING);
489 td->file_service_file = f;
490 td->file_service_left = td->file_service_nr - 1;
494 static struct fio_file *find_next_new_file(struct thread_data *td)
498 if (!td->nr_open_files || td->nr_done_files >= td->o.nr_files)
501 if (td->o.file_service_type == FIO_FSERVICE_RR)
502 f = get_next_file_rr(td, 0, FIO_FILE_OPEN);
504 f = get_next_file_rand(td, 0, FIO_FILE_OPEN);
509 struct io_u *__get_io_u(struct thread_data *td)
511 struct io_u *io_u = NULL;
513 if (!list_empty(&td->io_u_requeues))
514 io_u = list_entry(td->io_u_requeues.next, struct io_u, list);
515 else if (!queue_full(td)) {
516 io_u = list_entry(td->io_u_freelist.next, struct io_u, list);
525 assert(io_u->flags & IO_U_F_FREE);
526 io_u->flags &= ~IO_U_F_FREE;
529 list_del(&io_u->list);
530 list_add(&io_u->list, &td->io_u_busylist);
538 * Return an io_u to be processed. Gets a buflen and offset, sets direction,
539 * etc. The returned io_u is fully ready to be prepped and submitted.
541 struct io_u *get_io_u(struct thread_data *td)
547 io_u = __get_io_u(td);
552 * from a requeue, io_u already setup
558 f = get_next_file(td);
568 if (!fill_io_u(td, io_u))
572 * td_io_close() does a put_file() as well, so no need to
576 td_io_close_file(td, f);
577 f->flags |= FIO_FILE_DONE;
581 * probably not the right place to do this, but see
582 * if we need to open a new file
584 if (td->nr_open_files < td->o.open_files &&
585 td->o.open_files != td->o.nr_files) {
586 f = find_next_new_file(td);
588 if (!f || (ret = td_io_open_file(td, f))) {
596 assert(io_u->file->flags & FIO_FILE_OPEN);
598 if (td->zone_bytes >= td->o.zone_size) {
600 f->last_pos += td->o.zone_skip;
603 if (io_u->ddir != DDIR_SYNC) {
609 f->last_pos = io_u->offset + io_u->buflen;
611 if (td->o.verify != VERIFY_NONE)
612 populate_verify_io_u(td, io_u);
616 * Set io data pointers.
618 io_u->endpos = io_u->offset + io_u->buflen;
620 io_u->xfer_buf = io_u->buf;
621 io_u->xfer_buflen = io_u->buflen;
623 if (td_io_prep(td, io_u)) {
628 fio_gettime(&io_u->start_time, NULL);
632 void io_u_log_error(struct thread_data *td, struct io_u *io_u)
634 const char *msg[] = { "read", "write", "sync" };
636 log_err("fio: io_u error");
639 log_err(" on file %s", io_u->file->file_name);
641 log_err(": %s\n", strerror(io_u->error));
643 log_err(" %s offset=%llu, buflen=%lu\n", msg[io_u->ddir], io_u->offset, io_u->xfer_buflen);
646 td_verror(td, io_u->error, "io_u error");
649 static void io_completed(struct thread_data *td, struct io_u *io_u,
650 struct io_completion_data *icd)
654 assert(io_u->flags & IO_U_F_FLIGHT);
655 io_u->flags &= ~IO_U_F_FLIGHT;
657 if (io_u->ddir == DDIR_SYNC) {
658 td->last_was_sync = 1;
662 td->last_was_sync = 0;
665 unsigned int bytes = io_u->buflen - io_u->resid;
666 const enum fio_ddir idx = io_u->ddir;
669 td->io_blocks[idx]++;
670 td->io_bytes[idx] += bytes;
671 td->zone_bytes += bytes;
672 td->this_io_bytes[idx] += bytes;
674 io_u->file->last_completed_pos = io_u->endpos;
676 msec = mtime_since(&io_u->issue_time, &icd->time);
678 add_clat_sample(td, idx, msec);
679 add_bw_sample(td, idx, &icd->time);
680 io_u_mark_latency(td, msec);
682 if (td_write(td) && idx == DDIR_WRITE &&
683 td->o.verify != VERIFY_NONE)
684 log_io_piece(td, io_u);
686 icd->bytes_done[idx] += bytes;
689 ret = io_u->end_io(td, io_u);
690 if (ret && !icd->error)
694 icd->error = io_u->error;
695 io_u_log_error(td, io_u);
699 static void init_icd(struct io_completion_data *icd, int nr)
701 fio_gettime(&icd->time, NULL);
706 icd->bytes_done[0] = icd->bytes_done[1] = 0;
709 static void ios_completed(struct thread_data *td,
710 struct io_completion_data *icd)
715 for (i = 0; i < icd->nr; i++) {
716 io_u = td->io_ops->event(td, i);
718 io_completed(td, io_u, icd);
724 * Complete a single io_u for the sync engines.
726 long io_u_sync_complete(struct thread_data *td, struct io_u *io_u)
728 struct io_completion_data icd;
731 io_completed(td, io_u, &icd);
735 return icd.bytes_done[0] + icd.bytes_done[1];
737 td_verror(td, icd.error, "io_u_sync_complete");
742 * Called to complete min_events number of io for the async engines.
744 long io_u_queued_complete(struct thread_data *td, int min_events)
746 struct io_completion_data icd;
747 struct timespec *tvp = NULL;
749 struct timespec ts = { .tv_sec = 0, .tv_nsec = 0, };
754 ret = td_io_getevents(td, min_events, td->cur_depth, tvp);
756 td_verror(td, -ret, "td_io_getevents");
762 ios_completed(td, &icd);
764 return icd.bytes_done[0] + icd.bytes_done[1];
766 td_verror(td, icd.error, "io_u_queued_complete");
771 * Call when io_u is really queued, to update the submission latency.
773 void io_u_queued(struct thread_data *td, struct io_u *io_u)
775 unsigned long slat_time;
777 slat_time = mtime_since(&io_u->start_time, &io_u->issue_time);
778 add_slat_sample(td, io_u->ddir, slat_time);
781 #ifdef FIO_USE_TIMEOUT
782 void io_u_set_timeout(struct thread_data *td)
784 assert(td->cur_depth);
786 td->timer.it_interval.tv_sec = 0;
787 td->timer.it_interval.tv_usec = 0;
788 td->timer.it_value.tv_sec = IO_U_TIMEOUT + IO_U_TIMEOUT_INC;
789 td->timer.it_value.tv_usec = 0;
790 setitimer(ITIMER_REAL, &td->timer, NULL);
791 fio_gettime(&td->timeout_end, NULL);
794 static void io_u_dump(struct io_u *io_u)
796 unsigned long t_start = mtime_since_now(&io_u->start_time);
797 unsigned long t_issue = mtime_since_now(&io_u->issue_time);
799 log_err("io_u=%p, t_start=%lu, t_issue=%lu\n", io_u, t_start, t_issue);
800 log_err(" buf=%p/%p, len=%lu/%lu, offset=%llu\n", io_u->buf, io_u->xfer_buf, io_u->buflen, io_u->xfer_buflen, io_u->offset);
801 log_err(" ddir=%d, fname=%s\n", io_u->ddir, io_u->file->file_name);
804 void io_u_set_timeout(struct thread_data fio_unused *td)
809 #ifdef FIO_USE_TIMEOUT
810 static void io_u_timeout_handler(int fio_unused sig)
812 struct thread_data *td, *__td;
813 pid_t pid = getpid();
814 struct list_head *entry;
818 log_err("fio: io_u timeout\n");
821 * TLS would be nice...
824 for_each_td(__td, i) {
825 if (__td->pid == pid) {
832 log_err("fio: io_u timeout, can't find job\n");
836 if (!td->cur_depth) {
837 log_err("fio: timeout without pending work?\n");
841 log_err("fio: io_u timeout: job=%s, pid=%d\n", td->o.name, td->pid);
843 list_for_each(entry, &td->io_u_busylist) {
844 io_u = list_entry(entry, struct io_u, list);
849 td_verror(td, ETIMEDOUT, "io_u timeout");
854 void io_u_init_timeout(void)
856 #ifdef FIO_USE_TIMEOUT
857 signal(SIGALRM, io_u_timeout_handler);