2 * This file contains job initialization and setup functions.
14 #include <sys/types.h>
23 static char fio_version_string[] = "fio 1.37";
25 #define FIO_RANDSEED (0xb1899bedUL)
27 static char **ini_file;
28 static int max_jobs = MAX_JOBS;
29 static int dump_cmdline;
31 static struct thread_data def_thread;
32 struct thread_data *threads = NULL;
34 int exitall_on_terminate = 0;
37 unsigned long long mlock_size = 0;
40 char *job_section = NULL;
45 static int def_timeout;
46 static int write_lat_log;
48 static int prev_group_jobs;
50 unsigned long fio_debug = 0;
51 unsigned int fio_debug_jobno = -1;
52 unsigned int *fio_debug_jobp = NULL;
55 * Command line options. These will contain the above, plus a few
56 * extra that only pertain to fio itself and not jobs.
58 static struct option l_opts[FIO_NR_OPTIONS] = {
61 .has_arg = required_argument,
66 .has_arg = required_argument,
70 .name = "latency-log",
71 .has_arg = required_argument,
75 .name = "bandwidth-log",
76 .has_arg = required_argument,
81 .has_arg = optional_argument,
86 .has_arg = no_argument,
91 .has_arg = no_argument,
96 .has_arg = optional_argument,
101 .has_arg = no_argument,
106 .has_arg = no_argument,
111 .has_arg = required_argument,
116 .has_arg = required_argument,
121 .has_arg = required_argument,
125 .name = "alloc-size",
126 .has_arg = required_argument,
131 .has_arg = required_argument,
139 static const char *tiobench_opts[] = {
140 "buffered=0", "size=4*1024*$mb_memory", "bs=4k", "timeout=600",
141 "numjobs=4", "group_reporting", "thread", "overwrite=1",
142 "filename=.fio.tio.1:.fio.tio.2:.fio.tio.3:.fio.tio.4",
143 "name=seqwrite", "rw=write", "end_fsync=1",
144 "name=randwrite", "stonewall", "rw=randwrite", "end_fsync=1",
145 "name=seqread", "stonewall", "rw=read",
146 "name=randread", "stonewall", "rw=randread", NULL,
149 static const char **fio_prof_strings[PROFILE_END] = {
154 static const char *profiles[PROFILE_END] = {
170 * Return a free job structure.
172 static struct thread_data *get_new_job(int global, struct thread_data *parent)
174 struct thread_data *td;
178 if (thread_number >= max_jobs)
181 td = &threads[thread_number++];
184 td->o.uid = td->o.gid = -1U;
186 dup_files(td, parent);
187 options_mem_dupe(td);
189 td->thread_number = thread_number;
193 static void put_job(struct thread_data *td)
195 if (td == &def_thread)
199 log_info("fio: %s\n", td->verror);
201 memset(&threads[td->thread_number - 1], 0, sizeof(*td));
205 static int __setup_rate(struct thread_data *td, enum fio_ddir ddir)
207 unsigned int bs = td->o.min_bs[ddir];
208 unsigned long long bytes_per_sec;
210 if (td->o.rate[ddir])
211 bytes_per_sec = td->o.rate[ddir];
213 bytes_per_sec = td->o.rate_iops[ddir] * bs;
215 if (!bytes_per_sec) {
216 log_err("rate lower than supported\n");
220 td->rate_nsec_cycle[ddir] = 1000000000ULL / bytes_per_sec;
221 td->rate_pending_usleep[ddir] = 0;
225 static int setup_rate(struct thread_data *td)
229 if (td->o.rate[DDIR_READ] || td->o.rate_iops[DDIR_READ])
230 ret = __setup_rate(td, DDIR_READ);
231 if (td->o.rate[DDIR_WRITE] || td->o.rate_iops[DDIR_WRITE])
232 ret |= __setup_rate(td, DDIR_WRITE);
237 static int fixed_block_size(struct thread_options *o)
239 return o->min_bs[DDIR_READ] == o->max_bs[DDIR_READ] &&
240 o->min_bs[DDIR_WRITE] == o->max_bs[DDIR_WRITE] &&
241 o->min_bs[DDIR_READ] == o->min_bs[DDIR_WRITE];
245 * Lazy way of fixing up options that depend on each other. We could also
246 * define option callback handlers, but this is easier.
248 static int fixup_options(struct thread_data *td)
250 struct thread_options *o = &td->o;
252 #ifndef FIO_HAVE_PSHARED_MUTEX
253 if (!td->o.use_thread) {
254 log_info("fio: this platform does not support process shared"
255 " mutexes, forcing use of threads. Use the 'thread'"
256 " option to get rid of this warning.\n");
257 td->o.use_thread = 1;
261 if (o->write_iolog_file && o->read_iolog_file) {
262 log_err("fio: read iolog overrides write_iolog\n");
263 free(o->write_iolog_file);
264 o->write_iolog_file = NULL;
268 * only really works for sequential io for now, and with 1 file
270 if (o->zone_size && td_random(td) && o->open_files == 1)
274 * Reads can do overwrites, we always need to pre-create the file
276 if (td_read(td) || td_rw(td))
279 if (!o->min_bs[DDIR_READ])
280 o->min_bs[DDIR_READ] = o->bs[DDIR_READ];
281 if (!o->max_bs[DDIR_READ])
282 o->max_bs[DDIR_READ] = o->bs[DDIR_READ];
283 if (!o->min_bs[DDIR_WRITE])
284 o->min_bs[DDIR_WRITE] = o->bs[DDIR_WRITE];
285 if (!o->max_bs[DDIR_WRITE])
286 o->max_bs[DDIR_WRITE] = o->bs[DDIR_WRITE];
288 o->rw_min_bs = min(o->min_bs[DDIR_READ], o->min_bs[DDIR_WRITE]);
291 * For random IO, allow blockalign offset other than min_bs.
293 if (!o->ba[DDIR_READ] || !td_random(td))
294 o->ba[DDIR_READ] = o->min_bs[DDIR_READ];
295 if (!o->ba[DDIR_WRITE] || !td_random(td))
296 o->ba[DDIR_WRITE] = o->min_bs[DDIR_WRITE];
298 if ((o->ba[DDIR_READ] != o->min_bs[DDIR_READ] ||
299 o->ba[DDIR_WRITE] != o->min_bs[DDIR_WRITE]) &&
300 !td->o.norandommap) {
301 log_err("fio: Any use of blockalign= turns off randommap\n");
302 td->o.norandommap = 1;
305 if (!o->file_size_high)
306 o->file_size_high = o->file_size_low;
308 if (o->norandommap && o->verify != VERIFY_NONE
309 && !fixed_block_size(o)) {
310 log_err("fio: norandommap given for variable block sizes, "
311 "verify disabled\n");
312 o->verify = VERIFY_NONE;
314 if (o->bs_unaligned && (o->odirect || td->io_ops->flags & FIO_RAWIO))
315 log_err("fio: bs_unaligned may not work with raw io\n");
318 * thinktime_spin must be less than thinktime
320 if (o->thinktime_spin > o->thinktime)
321 o->thinktime_spin = o->thinktime;
324 * The low water mark cannot be bigger than the iodepth
326 if (o->iodepth_low > o->iodepth || !o->iodepth_low) {
328 * syslet work around - if the workload is sequential,
329 * we want to let the queue drain all the way down to
330 * avoid seeking between async threads
332 if (!strcmp(td->io_ops->name, "syslet-rw") && !td_random(td))
335 o->iodepth_low = o->iodepth;
339 * If batch number isn't set, default to the same as iodepth
341 if (o->iodepth_batch > o->iodepth || !o->iodepth_batch)
342 o->iodepth_batch = o->iodepth;
344 if (o->nr_files > td->files_index)
345 o->nr_files = td->files_index;
347 if (o->open_files > o->nr_files || !o->open_files)
348 o->open_files = o->nr_files;
350 if (((o->rate[0] + o->rate[1]) && (o->rate_iops[0] + o->rate_iops[1]))||
351 ((o->ratemin[0] + o->ratemin[1]) && (o->rate_iops_min[0] +
352 o->rate_iops_min[1]))) {
353 log_err("fio: rate and rate_iops are mutually exclusive\n");
356 if ((o->rate[0] < o->ratemin[0]) || (o->rate[1] < o->ratemin[1]) ||
357 (o->rate_iops[0] < o->rate_iops_min[0]) ||
358 (o->rate_iops[1] < o->rate_iops_min[1])) {
359 log_err("fio: minimum rate exceeds rate\n");
363 if (!o->timeout && o->time_based) {
364 log_err("fio: time_based requires a runtime/timeout setting\n");
368 if (o->fill_device && !o->size)
371 if (td_rw(td) && td->o.verify != VERIFY_NONE)
372 log_info("fio: mixed read/write workload with verify. May not "
373 "work as expected, unless you pre-populated the file\n");
375 if (td->o.verify != VERIFY_NONE)
376 td->o.refill_buffers = 1;
378 if (td->o.pre_read) {
379 td->o.invalidate_cache = 0;
380 if (td->io_ops->flags & FIO_PIPEIO)
381 log_info("fio: cannot pre-read files with an IO engine"
382 " that isn't seekable. Pre-read disabled.\n");
385 #ifndef FIO_HAVE_FDATASYNC
386 if (td->o.fdatasync_blocks) {
387 log_info("fio: this platform does not support fdatasync()"
388 " falling back to using fsync(). Use the 'fsync'"
389 " option instead of 'fdatasync' to get rid of"
391 td->o.fsync_blocks = td->o.fdatasync_blocks;
392 td->o.fdatasync_blocks = 0;
400 * This function leaks the buffer
402 static char *to_kmg(unsigned int val)
404 char *buf = malloc(32);
405 char post[] = { 0, 'K', 'M', 'G', 'P', 'E', 0 };
416 snprintf(buf, 31, "%u%c", val, *p);
420 /* External engines are specified by "external:name.o") */
421 static const char *get_engine_name(const char *str)
423 char *p = strstr(str, ":");
429 strip_blank_front(&p);
434 static int exists_and_not_file(const char *filename)
438 if (lstat(filename, &sb) == -1)
441 if (S_ISREG(sb.st_mode))
447 void td_fill_rand_seeds(struct thread_data *td)
449 os_random_seed(td->rand_seeds[0], &td->bsrange_state);
450 os_random_seed(td->rand_seeds[1], &td->verify_state);
451 os_random_seed(td->rand_seeds[2], &td->rwmix_state);
453 if (td->o.file_service_type == FIO_FSERVICE_RANDOM)
454 os_random_seed(td->rand_seeds[3], &td->next_file_state);
456 os_random_seed(td->rand_seeds[5], &td->file_size_state);
461 if (td->o.rand_repeatable)
462 td->rand_seeds[4] = FIO_RANDSEED * td->thread_number;
464 os_random_seed(td->rand_seeds[4], &td->random_state);
468 * Initialize the various random states we need (random io, block size ranges,
469 * read/write mix, etc).
471 static int init_random_state(struct thread_data *td)
475 fd = open("/dev/urandom", O_RDONLY);
477 td_verror(td, errno, "open");
481 if (read(fd, td->rand_seeds, sizeof(td->rand_seeds)) <
482 (int) sizeof(td->rand_seeds)) {
483 td_verror(td, EIO, "read");
489 td_fill_rand_seeds(td);
494 * Adds a job to the list of things todo. Sanitizes the various options
495 * to make sure we don't have conflicts, and initializes various
498 static int add_job(struct thread_data *td, const char *jobname, int job_add_num)
500 const char *ddir_str[] = { NULL, "read", "write", "rw", NULL,
501 "randread", "randwrite", "randrw" };
504 char fname[PATH_MAX];
505 int numjobs, file_alloced;
508 * the def_thread is just for options, it's not a real job
510 if (td == &def_thread)
514 * if we are just dumping the output command line, don't add the job
521 engine = get_engine_name(td->o.ioengine);
522 td->io_ops = load_ioengine(td, engine);
524 log_err("fio: failed to load engine %s\n", engine);
528 if (td->o.use_thread)
534 td->io_ops->flags |= FIO_RAWIO;
537 if (!td->o.filename && !td->files_index && !td->o.read_iolog_file) {
540 if (td->o.nr_files == 1 && exists_and_not_file(jobname))
541 add_file(td, jobname);
543 for (i = 0; i < td->o.nr_files; i++) {
544 sprintf(fname, "%s.%d.%d", jobname,
545 td->thread_number, i);
551 if (fixup_options(td))
554 if (td->io_ops->flags & FIO_DISKLESSIO) {
557 for_each_file(td, f, i)
558 f->real_file_size = -1ULL;
561 td->mutex = fio_mutex_init(0);
563 td->ts.clat_stat[0].min_val = td->ts.clat_stat[1].min_val = ULONG_MAX;
564 td->ts.slat_stat[0].min_val = td->ts.slat_stat[1].min_val = ULONG_MAX;
565 td->ts.bw_stat[0].min_val = td->ts.bw_stat[1].min_val = ULONG_MAX;
566 td->ddir_nr = td->o.ddir_nr;
568 if ((td->o.stonewall || td->o.new_group) && prev_group_jobs) {
573 td->groupid = groupid;
576 if (init_random_state(td))
582 if (td->o.write_lat_log) {
583 setup_log(&td->ts.slat_log);
584 setup_log(&td->ts.clat_log);
586 if (td->o.write_bw_log)
587 setup_log(&td->ts.bw_log);
590 td->o.name = strdup(jobname);
594 if (!strcmp(td->io_ops->name, "cpuio")) {
595 log_info("%s: ioengine=cpu, cpuload=%u,"
596 " cpucycle=%u\n", td->o.name,
600 char *c1, *c2, *c3, *c4;
602 c1 = to_kmg(td->o.min_bs[DDIR_READ]);
603 c2 = to_kmg(td->o.max_bs[DDIR_READ]);
604 c3 = to_kmg(td->o.min_bs[DDIR_WRITE]);
605 c4 = to_kmg(td->o.max_bs[DDIR_WRITE]);
607 log_info("%s: (g=%d): rw=%s, bs=%s-%s/%s-%s,"
608 " ioengine=%s, iodepth=%u\n",
609 td->o.name, td->groupid,
610 ddir_str[td->o.td_ddir],
620 } else if (job_add_num == 1)
625 * recurse add identical jobs, clear numjobs and stonewall options
626 * as they don't apply to sub-jobs
628 numjobs = td->o.numjobs;
630 struct thread_data *td_new = get_new_job(0, td);
635 td_new->o.numjobs = 1;
636 td_new->o.stonewall = 0;
637 td_new->o.new_group = 0;
640 td_new->o.filename = NULL;
641 td_new->files_index = 0;
642 td_new->files_size = 0;
643 td_new->files = NULL;
646 job_add_num = numjobs - 1;
648 if (add_job(td_new, jobname, job_add_num))
658 static int skip_this_section(const char *name)
662 if (!strncmp(name, "global", 6))
665 return strcmp(job_section, name);
668 static int is_empty_or_comment(char *line)
672 for (i = 0; i < strlen(line); i++) {
677 if (!isspace(line[i]) && !iscntrl(line[i]))
685 * This is our [ini] type file parser.
687 static int parse_jobs_ini(char *file, int stonewall_flag)
690 struct thread_data *td;
694 int ret = 0, stonewall;
699 int i, alloc_opts, num_opts;
701 if (!strcmp(file, "-"))
704 f = fopen(file, "r");
707 perror("fopen job file");
711 string = malloc(4096);
714 * it's really 256 + small bit, 280 should suffice
717 memset(name, 0, 280);
720 opts = malloc(sizeof(char *) * alloc_opts);
723 stonewall = stonewall_flag;
726 * if skip_fgets is set, we already have loaded a line we
730 p = fgets(string, 4095, f);
736 strip_blank_front(&p);
739 if (is_empty_or_comment(p))
741 if (sscanf(p, "[%255s]", name) != 1) {
744 log_err("fio: option <%s> outside of [] job section\n",
749 if (skip_this_section(name)) {
755 global = !strncmp(name, "global", 6);
757 name[strlen(name) - 1] = '\0';
763 log_info("--name=%s ", name);
767 td = get_new_job(global, &def_thread);
774 * Seperate multiple job files by a stonewall
776 if (!global && stonewall) {
777 td->o.stonewall = stonewall;
782 memset(opts, 0, alloc_opts * sizeof(char *));
784 while ((p = fgets(string, 4096, f)) != NULL) {
785 if (is_empty_or_comment(p))
788 strip_blank_front(&p);
791 * new section, break out and make sure we don't
792 * fgets() a new line at the top.
801 if (num_opts == alloc_opts) {
804 alloc_opts * sizeof(char *));
807 opts[num_opts] = strdup(p);
811 ret = fio_options_parse(td, opts, num_opts);
814 for (i = 0; i < num_opts; i++)
815 log_info("--%s ", opts[i]);
817 ret = add_job(td, name, 0);
819 log_err("fio: job %s dropped\n", name);
823 for (i = 0; i < num_opts; i++)
831 for (i = 0; i < num_opts; i++)
842 static int fill_def_thread(void)
844 memset(&def_thread, 0, sizeof(def_thread));
846 fio_getaffinity(getpid(), &def_thread.o.cpumask);
849 * fill default options
851 fio_fill_default_options(&def_thread);
853 def_thread.o.timeout = def_timeout;
854 def_thread.o.write_bw_log = write_bw_log;
855 def_thread.o.write_lat_log = write_lat_log;
860 static void free_shm(void)
862 struct shmid_ds sbuf;
869 fio_debug_jobp = NULL;
871 shmctl(shm_id, IPC_RMID, &sbuf);
878 * The thread area is shared between the main process and the job
879 * threads/processes. So setup a shared memory segment that will hold
880 * all the job info. We use the end of the region for keeping track of
881 * open files across jobs, for file sharing.
883 static int setup_thread_area(void)
888 * 1024 is too much on some machines, scale max_jobs if
889 * we get a failure that looks like too large a shm segment
892 size_t size = max_jobs * sizeof(struct thread_data);
894 size += file_hash_size;
895 size += sizeof(unsigned int);
897 shm_id = shmget(0, size, IPC_CREAT | 0600);
900 if (errno != EINVAL) {
911 threads = shmat(shm_id, NULL, 0);
912 if (threads == (void *) -1) {
917 memset(threads, 0, max_jobs * sizeof(struct thread_data));
918 hash = (void *) threads + max_jobs * sizeof(struct thread_data);
919 fio_debug_jobp = (void *) hash + file_hash_size;
920 *fio_debug_jobp = -1;
921 file_hash_init(hash);
926 static void usage(const char *name)
928 printf("%s\n", fio_version_string);
929 printf("%s [options] [job options] <job file(s)>\n", name);
930 printf("\t--debug=options\tEnable debug logging\n");
931 printf("\t--output\tWrite output to file\n");
932 printf("\t--timeout\tRuntime in seconds\n");
933 printf("\t--latency-log\tGenerate per-job latency logs\n");
934 printf("\t--bandwidth-log\tGenerate per-job bandwidth logs\n");
935 printf("\t--minimal\tMinimal (terse) output\n");
936 printf("\t--version\tPrint version info and exit\n");
937 printf("\t--help\t\tPrint this page\n");
938 printf("\t--cmdhelp=cmd\tPrint command help, \"all\" for all of"
940 printf("\t--showcmd\tTurn a job file into command line options\n");
941 printf("\t--eta=when\tWhen ETA estimate should be printed\n");
942 printf("\t \tMay be \"always\", \"never\" or \"auto\"\n");
943 printf("\t--readonly\tTurn on safety read-only checks, preventing"
945 printf("\t--section=name\tOnly run specified section in job file\n");
946 printf("\t--alloc-size=kb\tSet smalloc pool to this size in kb"
948 printf("\nFio was written by Jens Axboe <jens.axboe@oracle.com>\n");
952 struct debug_level debug_levels[] = {
953 { .name = "process", .shift = FD_PROCESS, },
954 { .name = "file", .shift = FD_FILE, },
955 { .name = "io", .shift = FD_IO, },
956 { .name = "mem", .shift = FD_MEM, },
957 { .name = "blktrace", .shift = FD_BLKTRACE },
958 { .name = "verify", .shift = FD_VERIFY },
959 { .name = "random", .shift = FD_RANDOM },
960 { .name = "parse", .shift = FD_PARSE },
961 { .name = "diskutil", .shift = FD_DISKUTIL },
962 { .name = "job", .shift = FD_JOB },
963 { .name = "mutex", .shift = FD_MUTEX },
967 static int set_debug(const char *string)
969 struct debug_level *dl;
970 char *p = (char *) string;
974 if (!strcmp(string, "?") || !strcmp(string, "help")) {
977 log_info("fio: dumping debug options:");
978 for (i = 0; debug_levels[i].name; i++) {
979 dl = &debug_levels[i];
980 log_info("%s,", dl->name);
986 while ((opt = strsep(&p, ",")) != NULL) {
989 if (!strncmp(opt, "all", 3)) {
990 log_info("fio: set all debug options\n");
995 for (i = 0; debug_levels[i].name; i++) {
996 dl = &debug_levels[i];
997 found = !strncmp(opt, dl->name, strlen(dl->name));
1001 if (dl->shift == FD_JOB) {
1002 opt = strchr(opt, ':');
1004 log_err("fio: missing job number\n");
1008 fio_debug_jobno = atoi(opt);
1009 log_info("fio: set debug jobno %d\n",
1012 log_info("fio: set debug option %s\n", opt);
1013 fio_debug |= (1UL << dl->shift);
1019 log_err("fio: debug mask %s not found\n", opt);
1024 static int set_debug(const char *string)
1026 log_err("fio: debug tracing not included in build\n");
1031 static int load_profile(const char *profile)
1033 struct thread_data *td, *td_parent;
1035 int i, in_global = 1;
1038 dprint(FD_PARSE, "loading profile %s\n", profile);
1040 for (i = 0; i < PROFILE_END; i++) {
1041 if (!strcmp(profile, profiles[i]))
1045 if (i == PROFILE_END) {
1046 log_err("fio: unknown profile %s\n", profile);
1050 o = fio_prof_strings[i];
1055 td_parent = td = NULL;
1057 if (!strncmp(o[i], "name", 4)) {
1060 add_job(td, jobname, 0);
1062 sprintf(jobname, "%s", o[i] + 5);
1064 if (in_global && !td_parent)
1065 td_parent = get_new_job(1, &def_thread);
1066 else if (!in_global && !td) {
1068 td_parent = &def_thread;
1069 td = get_new_job(0, td_parent);
1072 fio_options_parse(td_parent, (char **) &o[i], 1);
1074 fio_options_parse(td, (char **) &o[i], 1);
1078 add_job(td, jobname, 0);
1082 static int parse_cmd_line(int argc, char *argv[])
1084 struct thread_data *td = NULL;
1085 int c, ini_idx = 0, lidx, ret = 0, do_exit = 0, exit_val = 0;
1087 while ((c = getopt_long_only(argc, argv, "", l_opts, &lidx)) != -1) {
1090 smalloc_pool_size = atoi(optarg);
1093 def_timeout = atoi(optarg);
1102 f_out = fopen(optarg, "w+");
1104 perror("fopen output");
1116 exit(fio_show_option_help(optarg));
1124 printf("%s\n", fio_version_string);
1127 if (!strcmp("always", optarg))
1128 eta_print = FIO_ETA_ALWAYS;
1129 else if (!strcmp("never", optarg))
1130 eta_print = FIO_ETA_NEVER;
1133 if (set_debug(optarg))
1137 if (!strcmp(optarg, "global")) {
1138 log_err("fio: can't use global as only "
1146 job_section = strdup(optarg);
1149 if (load_profile(optarg))
1152 case FIO_GETOPT_JOB: {
1153 const char *opt = l_opts[lidx].name;
1156 if (!strncmp(opt, "name", 4) && td) {
1157 ret = add_job(td, td->o.name ?: "fio", 0);
1165 int is_section = !strncmp(opt, "name", 4);
1168 if (!is_section || !strncmp(val, "global", 6))
1171 if (is_section && skip_this_section(val))
1174 td = get_new_job(global, &def_thread);
1179 ret = fio_cmd_option_parse(td, opt, val);
1194 ret = add_job(td, td->o.name ?: "fio", 0);
1199 while (optind < argc) {
1201 ini_file = realloc(ini_file, ini_idx * sizeof(char *));
1202 ini_file[ini_idx - 1] = strdup(argv[optind]);
1209 int parse_options(int argc, char *argv[])
1216 fio_options_dup_and_init(l_opts);
1218 if (setup_thread_area())
1220 if (fill_def_thread())
1223 job_files = parse_cmd_line(argc, argv);
1225 for (i = 0; i < job_files; i++) {
1226 if (fill_def_thread())
1228 if (parse_jobs_ini(ini_file[i], i))
1234 options_mem_free(&def_thread);
1236 if (!thread_number) {
1240 log_err("No jobs defined(s)\n\n");
1245 if (def_thread.o.gtod_offload) {
1247 fio_gtod_offload = 1;
1248 fio_gtod_cpu = def_thread.o.gtod_cpu;