stat.c

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