[PATCH] Document how to setup/use huge pages
[fio.git] / stat.c
1 #include <stdio.h>
2 #include <string.h>
3 #include <sys/time.h>
4 #include <sys/types.h>
5 #include <sys/stat.h>
6 #include <dirent.h>
7 #include <libgen.h>
8 #include <math.h>
9
10 #include "fio.h"
11
12 static struct itimerval itimer;
13 static struct list_head disk_list = LIST_HEAD_INIT(disk_list);
14
15 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
16 {
17         unsigned in_flight;
18         char line[256];
19         FILE *f;
20         char *p;
21
22         f = fopen(du->path, "r");
23         if (!f)
24                 return 1;
25
26         p = fgets(line, sizeof(line), f);
27         if (!p) {
28                 fclose(f);
29                 return 1;
30         }
31
32         if (sscanf(p, "%u %u %llu %u %u %u %llu %u %u %u %u\n", &dus->ios[0], &dus->merges[0], &dus->sectors[0], &dus->ticks[0], &dus->ios[1], &dus->merges[1], &dus->sectors[1], &dus->ticks[1], &in_flight, &dus->io_ticks, &dus->time_in_queue) != 11) {
33                 fclose(f);
34                 return 1;
35         }
36
37         fclose(f);
38         return 0;
39 }
40
41 static void update_io_tick_disk(struct disk_util *du)
42 {
43         struct disk_util_stat __dus, *dus, *ldus;
44         struct timeval t;
45
46         if (get_io_ticks(du, &__dus))
47                 return;
48
49         dus = &du->dus;
50         ldus = &du->last_dus;
51
52         dus->sectors[0] += (__dus.sectors[0] - ldus->sectors[0]);
53         dus->sectors[1] += (__dus.sectors[1] - ldus->sectors[1]);
54         dus->ios[0] += (__dus.ios[0] - ldus->ios[0]);
55         dus->ios[1] += (__dus.ios[1] - ldus->ios[1]);
56         dus->merges[0] += (__dus.merges[0] - ldus->merges[0]);
57         dus->merges[1] += (__dus.merges[1] - ldus->merges[1]);
58         dus->ticks[0] += (__dus.ticks[0] - ldus->ticks[0]);
59         dus->ticks[1] += (__dus.ticks[1] - ldus->ticks[1]);
60         dus->io_ticks += (__dus.io_ticks - ldus->io_ticks);
61         dus->time_in_queue += (__dus.time_in_queue - ldus->time_in_queue);
62
63         fio_gettime(&t, NULL);
64         du->msec += mtime_since(&du->time, &t);
65         memcpy(&du->time, &t, sizeof(t));
66         memcpy(ldus, &__dus, sizeof(__dus));
67 }
68
69 void update_io_ticks(void)
70 {
71         struct list_head *entry;
72         struct disk_util *du;
73
74         list_for_each(entry, &disk_list) {
75                 du = list_entry(entry, struct disk_util, list);
76                 update_io_tick_disk(du);
77         }
78 }
79
80 static int disk_util_exists(dev_t dev)
81 {
82         struct list_head *entry;
83         struct disk_util *du;
84
85         list_for_each(entry, &disk_list) {
86                 du = list_entry(entry, struct disk_util, list);
87
88                 if (du->dev == dev)
89                         return 1;
90         }
91
92         return 0;
93 }
94
95 static void disk_util_add(dev_t dev, char *path)
96 {
97         struct disk_util *du = malloc(sizeof(*du));
98
99         memset(du, 0, sizeof(*du));
100         INIT_LIST_HEAD(&du->list);
101         sprintf(du->path, "%s/stat", path);
102         du->name = strdup(basename(path));
103         du->dev = dev;
104
105         fio_gettime(&du->time, NULL);
106         get_io_ticks(du, &du->last_dus);
107
108         list_add_tail(&du->list, &disk_list);
109 }
110
111 static int check_dev_match(dev_t dev, char *path)
112 {
113         unsigned int major, minor;
114         char line[256], *p;
115         FILE *f;
116
117         f = fopen(path, "r");
118         if (!f) {
119                 perror("open path");
120                 return 1;
121         }
122
123         p = fgets(line, sizeof(line), f);
124         if (!p) {
125                 fclose(f);
126                 return 1;
127         }
128
129         if (sscanf(p, "%u:%u", &major, &minor) != 2) {
130                 fclose(f);
131                 return 1;
132         }
133
134         if (((major << 8) | minor) == dev) {
135                 fclose(f);
136                 return 0;
137         }
138
139         fclose(f);
140         return 1;
141 }
142
143 static int find_block_dir(dev_t dev, char *path)
144 {
145         struct dirent *dir;
146         struct stat st;
147         int found = 0;
148         DIR *D;
149
150         D = opendir(path);
151         if (!D)
152                 return 0;
153
154         while ((dir = readdir(D)) != NULL) {
155                 char full_path[256];
156
157                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
158                         continue;
159
160                 sprintf(full_path, "%s/%s", path, dir->d_name);
161
162                 if (!strcmp(dir->d_name, "dev")) {
163                         if (!check_dev_match(dev, full_path)) {
164                                 found = 1;
165                                 break;
166                         }
167                 }
168
169                 if (lstat(full_path, &st) == -1) {
170                         perror("stat");
171                         break;
172                 }
173
174                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
175                         continue;
176
177                 found = find_block_dir(dev, full_path);
178                 if (found) {
179                         strcpy(path, full_path);
180                         break;
181                 }
182         }
183
184         closedir(D);
185         return found;
186 }
187
188 void init_disk_util(struct thread_data *td)
189 {
190         struct fio_file *f;
191         struct stat st;
192         char foo[PATH_MAX], tmp[PATH_MAX];
193         dev_t dev;
194         char *p;
195
196         if (!td->do_disk_util)
197                 return;
198
199         /*
200          * Just use the same file, they are on the same device.
201          */
202         f = &td->files[0];
203         if (!stat(f->file_name, &st)) {
204                 if (S_ISBLK(st.st_mode))
205                         dev = st.st_rdev;
206                 else
207                         dev = st.st_dev;
208         } else {
209                 /*
210                  * must be a file, open "." in that path
211                  */
212                 strncpy(foo, f->file_name, PATH_MAX - 1);
213                 p = dirname(foo);
214                 if (stat(p, &st)) {
215                         perror("disk util stat");
216                         return;
217                 }
218
219                 dev = st.st_dev;
220         }
221
222         if (disk_util_exists(dev))
223                 return;
224                 
225         sprintf(foo, "/sys/block");
226         if (!find_block_dir(dev, foo))
227                 return;
228
229         /*
230          * If there's a ../queue/ directory there, we are inside a partition.
231          * Check if that is the case and jump back. For loop/md/dm etc we
232          * are already in the right spot.
233          */
234         sprintf(tmp, "%s/../queue", foo);
235         if (!stat(tmp, &st)) {
236                 p = dirname(foo);
237                 sprintf(tmp, "%s/queue", p);
238                 if (stat(tmp, &st)) {
239                         log_err("unknown sysfs layout\n");
240                         return;
241                 }
242                 strncpy(tmp, p, PATH_MAX - 1);
243                 sprintf(foo, "%s", tmp);
244         }
245
246         if (td->ioscheduler)
247                 td->sysfs_root = strdup(foo);
248
249         disk_util_add(dev, foo);
250 }
251
252 void disk_util_timer_arm(void)
253 {
254         itimer.it_value.tv_sec = 0;
255         itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
256         setitimer(ITIMER_REAL, &itimer, NULL);
257 }
258
259 void update_rusage_stat(struct thread_data *td)
260 {
261         getrusage(RUSAGE_SELF, &td->ru_end);
262
263         td->usr_time += mtime_since(&td->ru_start.ru_utime, &td->ru_end.ru_utime);
264         td->sys_time += mtime_since(&td->ru_start.ru_stime, &td->ru_end.ru_stime);
265         td->ctx += td->ru_end.ru_nvcsw + td->ru_end.ru_nivcsw - (td->ru_start.ru_nvcsw + td->ru_start.ru_nivcsw);
266
267         
268         memcpy(&td->ru_start, &td->ru_end, sizeof(td->ru_end));
269 }
270
271 static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
272                     double *mean, double *dev)
273 {
274         double n;
275
276         if (is->samples == 0)
277                 return 0;
278
279         *min = is->min_val;
280         *max = is->max_val;
281
282         n = (double) is->samples;
283         *mean = (double) is->val / n;
284         *dev = sqrt(((double) is->val_sq - (*mean * *mean) / n) / (n - 1));
285
286         return 1;
287 }
288
289 static void show_group_stats(struct group_run_stats *rs, int id)
290 {
291         fprintf(f_out, "\nRun status group %d (all jobs):\n", id);
292
293         if (rs->max_run[DDIR_READ])
294                 fprintf(f_out, "   READ: io=%lluMiB, aggrb=%llu, minb=%llu, maxb=%llu, mint=%llumsec, maxt=%llumsec\n", rs->io_kb[0] >> 10, rs->agg[0], rs->min_bw[0], rs->max_bw[0], rs->min_run[0], rs->max_run[0]);
295         if (rs->max_run[DDIR_WRITE])
296                 fprintf(f_out, "  WRITE: io=%lluMiB, aggrb=%llu, minb=%llu, maxb=%llu, mint=%llumsec, maxt=%llumsec\n", rs->io_kb[1] >> 10, rs->agg[1], rs->min_bw[1], rs->max_bw[1], rs->min_run[1], rs->max_run[1]);
297 }
298
299 static void show_disk_util(void)
300 {
301         struct disk_util_stat *dus;
302         struct list_head *entry, *next;
303         struct disk_util *du;
304         double util;
305
306         fprintf(f_out, "\nDisk stats (read/write):\n");
307
308         list_for_each(entry, &disk_list) {
309                 du = list_entry(entry, struct disk_util, list);
310                 dus = &du->dus;
311
312                 util = (double) 100 * du->dus.io_ticks / (double) du->msec;
313                 if (util > 100.0)
314                         util = 100.0;
315
316                 fprintf(f_out, "  %s: ios=%u/%u, merge=%u/%u, ticks=%u/%u, in_queue=%u, util=%3.2f%%\n", du->name, dus->ios[0], dus->ios[1], dus->merges[0], dus->merges[1], dus->ticks[0], dus->ticks[1], dus->time_in_queue, util);
317         }
318
319         /*
320          * now free the list
321          */
322         list_for_each_safe(entry, next, &disk_list) {
323                 list_del(entry);
324                 du = list_entry(entry, struct disk_util, list);
325                 free(du->name);
326                 free(du);
327         }
328 }
329
330 static void show_ddir_status(struct thread_data *td, struct group_run_stats *rs,
331                              int ddir)
332 {
333         const char *ddir_str[] = { "read ", "write" };
334         unsigned long min, max;
335         unsigned long long bw;
336         double mean, dev;
337
338         if (!td->runtime[ddir])
339                 return;
340
341         bw = td->io_bytes[ddir] / td->runtime[ddir];
342         fprintf(f_out, "  %s: io=%6lluMiB, bw=%6lluKiB/s, runt=%6lumsec\n", ddir_str[ddir], td->io_bytes[ddir] >> 20, bw, td->runtime[ddir]);
343
344         if (calc_lat(&td->slat_stat[ddir], &min, &max, &mean, &dev))
345                 fprintf(f_out, "    slat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
346
347         if (calc_lat(&td->clat_stat[ddir], &min, &max, &mean, &dev))
348                 fprintf(f_out, "    clat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
349
350         if (calc_lat(&td->bw_stat[ddir], &min, &max, &mean, &dev)) {
351                 double p_of_agg;
352
353                 p_of_agg = mean * 100 / (double) rs->agg[ddir];
354                 fprintf(f_out, "    bw (KiB/s) : min=%5lu, max=%5lu, per=%3.2f%%, avg=%5.02f, dev=%5.02f\n", min, max, p_of_agg, mean, dev);
355         }
356 }
357
358 static void show_thread_status(struct thread_data *td,
359                                struct group_run_stats *rs)
360 {
361         double usr_cpu, sys_cpu;
362         unsigned long runtime;
363
364         if (!(td->io_bytes[0] + td->io_bytes[1]) && !td->error)
365                 return;
366
367         fprintf(f_out, "%s: (groupid=%d): err=%2d:\n",td->name, td->groupid, td->error);
368
369         show_ddir_status(td, rs, td->ddir);
370         if (td->io_bytes[td->ddir ^ 1])
371                 show_ddir_status(td, rs, td->ddir ^ 1);
372
373         runtime = mtime_since(&td->epoch, &td->end_time);
374         if (runtime) {
375                 double runt = (double) runtime;
376
377                 usr_cpu = (double) td->usr_time * 100 / runt;
378                 sys_cpu = (double) td->sys_time * 100 / runt;
379         } else {
380                 usr_cpu = 0;
381                 sys_cpu = 0;
382         }
383
384         fprintf(f_out, "  cpu          : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu\n", usr_cpu, sys_cpu, td->ctx);
385 }
386
387 static void show_ddir_status_terse(struct thread_data *td,
388                                    struct group_run_stats *rs, int ddir)
389 {
390         unsigned long min, max;
391         unsigned long long bw;
392         double mean, dev;
393
394         bw = 0;
395         if (td->runtime[ddir])
396                 bw = td->io_bytes[ddir] / td->runtime[ddir];
397
398         fprintf(f_out, ",%llu,%llu,%lu", td->io_bytes[ddir] >> 10, bw, td->runtime[ddir]);
399
400         if (calc_lat(&td->slat_stat[ddir], &min, &max, &mean, &dev))
401                 fprintf(f_out, ",%lu,%lu,%f,%f", min, max, mean, dev);
402         else
403                 fprintf(f_out, ",%lu,%lu,%f,%f", 0UL, 0UL, 0.0, 0.0);
404
405         if (calc_lat(&td->clat_stat[ddir], &min, &max, &mean, &dev))
406                 fprintf(f_out, ",%lu,%lu,%f,%f", min, max, mean, dev);
407         else
408                 fprintf(f_out, ",%lu,%lu,%f,%f", 0UL, 0UL, 0.0, 0.0);
409
410         if (calc_lat(&td->bw_stat[ddir], &min, &max, &mean, &dev)) {
411                 double p_of_agg;
412
413                 p_of_agg = mean * 100 / (double) rs->agg[ddir];
414                 fprintf(f_out, ",%lu,%lu,%f%%,%f,%f", min, max, p_of_agg, mean, dev);
415         } else
416                 fprintf(f_out, ",%lu,%lu,%f%%,%f,%f", 0UL, 0UL, 0.0, 0.0, 0.0);
417                 
418 }
419
420
421 static void show_thread_status_terse(struct thread_data *td,
422                                      struct group_run_stats *rs)
423 {
424         double usr_cpu, sys_cpu;
425
426         fprintf(f_out, "%s,%d,%d",td->name, td->groupid, td->error);
427
428         show_ddir_status_terse(td, rs, 0);
429         show_ddir_status_terse(td, rs, 1);
430
431         if (td->runtime[0] + td->runtime[1]) {
432                 double runt = (double) (td->runtime[0] + td->runtime[1]);
433
434                 usr_cpu = (double) td->usr_time * 100 / runt;
435                 sys_cpu = (double) td->sys_time * 100 / runt;
436         } else {
437                 usr_cpu = 0;
438                 sys_cpu = 0;
439         }
440
441         fprintf(f_out, ",%f%%,%f%%,%lu\n", usr_cpu, sys_cpu, td->ctx);
442 }
443
444 void show_run_stats(void)
445 {
446         struct group_run_stats *runstats, *rs;
447         struct thread_data *td;
448         int i;
449
450         runstats = malloc(sizeof(struct group_run_stats) * (groupid + 1));
451
452         for (i = 0; i < groupid + 1; i++) {
453                 rs = &runstats[i];
454
455                 memset(rs, 0, sizeof(*rs));
456                 rs->min_bw[0] = rs->min_run[0] = ~0UL;
457                 rs->min_bw[1] = rs->min_run[1] = ~0UL;
458         }
459
460         for_each_td(td, i) {
461                 unsigned long long rbw, wbw;
462
463                 if (td->error) {
464                         fprintf(f_out, "%s: %s\n", td->name, td->verror);
465                         continue;
466                 }
467
468                 rs = &runstats[td->groupid];
469
470                 if (td->runtime[0] < rs->min_run[0] || !rs->min_run[0])
471                         rs->min_run[0] = td->runtime[0];
472                 if (td->runtime[0] > rs->max_run[0])
473                         rs->max_run[0] = td->runtime[0];
474                 if (td->runtime[1] < rs->min_run[1] || !rs->min_run[1])
475                         rs->min_run[1] = td->runtime[1];
476                 if (td->runtime[1] > rs->max_run[1])
477                         rs->max_run[1] = td->runtime[1];
478
479                 rbw = wbw = 0;
480                 if (td->runtime[0])
481                         rbw = td->io_bytes[0] / (unsigned long long) td->runtime[0];
482                 if (td->runtime[1])
483                         wbw = td->io_bytes[1] / (unsigned long long) td->runtime[1];
484
485                 if (rbw < rs->min_bw[0])
486                         rs->min_bw[0] = rbw;
487                 if (wbw < rs->min_bw[1])
488                         rs->min_bw[1] = wbw;
489                 if (rbw > rs->max_bw[0])
490                         rs->max_bw[0] = rbw;
491                 if (wbw > rs->max_bw[1])
492                         rs->max_bw[1] = wbw;
493
494                 rs->io_kb[0] += td->io_bytes[0] >> 10;
495                 rs->io_kb[1] += td->io_bytes[1] >> 10;
496         }
497
498         for (i = 0; i < groupid + 1; i++) {
499                 rs = &runstats[i];
500
501                 if (rs->max_run[0])
502                         rs->agg[0] = (rs->io_kb[0]*1024) / rs->max_run[0];
503                 if (rs->max_run[1])
504                         rs->agg[1] = (rs->io_kb[1]*1024) / rs->max_run[1];
505         }
506
507         /*
508          * don't overwrite last signal output
509          */
510         if (!terse_output)
511                 printf("\n");
512
513         for_each_td(td, i) {
514                 rs = &runstats[td->groupid];
515
516                 if (terse_output)
517                         show_thread_status_terse(td, rs);
518                 else
519                         show_thread_status(td, rs);
520         }
521
522         if (!terse_output) {
523                 for (i = 0; i < groupid + 1; i++)
524                         show_group_stats(&runstats[i], i);
525
526                 show_disk_util();
527         }
528
529         free(runstats);
530 }
531
532 static inline void add_stat_sample(struct io_stat *is, unsigned long val)
533 {
534         if (val > is->max_val)
535                 is->max_val = val;
536         if (val < is->min_val)
537                 is->min_val = val;
538
539         is->val += val;
540         is->val_sq += val * val;
541         is->samples++;
542 }
543
544 static void add_log_sample(struct thread_data *td, struct io_log *iolog,
545                            unsigned long val, enum fio_ddir ddir)
546 {
547         if (iolog->nr_samples == iolog->max_samples) {
548                 int new_size = sizeof(struct io_sample) * iolog->max_samples*2;
549
550                 iolog->log = realloc(iolog->log, new_size);
551                 iolog->max_samples <<= 1;
552         }
553
554         iolog->log[iolog->nr_samples].val = val;
555         iolog->log[iolog->nr_samples].time = mtime_since_now(&td->epoch);
556         iolog->log[iolog->nr_samples].ddir = ddir;
557         iolog->nr_samples++;
558 }
559
560 void add_clat_sample(struct thread_data *td, enum fio_ddir ddir,
561                      unsigned long msec)
562 {
563         add_stat_sample(&td->clat_stat[ddir], msec);
564
565         if (td->clat_log)
566                 add_log_sample(td, td->clat_log, msec, ddir);
567 }
568
569 void add_slat_sample(struct thread_data *td, enum fio_ddir ddir,
570                      unsigned long msec)
571 {
572         add_stat_sample(&td->slat_stat[ddir], msec);
573
574         if (td->slat_log)
575                 add_log_sample(td, td->slat_log, msec, ddir);
576 }
577
578 void add_bw_sample(struct thread_data *td, enum fio_ddir ddir,
579                    struct timeval *t)
580 {
581         unsigned long spent = mtime_since(&td->stat_sample_time[ddir], t);
582         unsigned long rate;
583
584         if (spent < td->bw_avg_time)
585                 return;
586
587         rate = (td->this_io_bytes[ddir] - td->stat_io_bytes[ddir]) / spent;
588         add_stat_sample(&td->bw_stat[ddir], rate);
589
590         if (td->bw_log)
591                 add_log_sample(td, td->bw_log, rate, ddir);
592
593         fio_gettime(&td->stat_sample_time[ddir], NULL);
594         td->stat_io_bytes[ddir] = td->this_io_bytes[ddir];
595 }
596
597