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         gettimeofday(&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         gettimeofday(&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                 if (!strcmp(dir->d_name, "device"))
 160                         continue;
 161
 162                 sprintf(full_path, "%s/%s", path, dir->d_name);
 163
 164                 if (!strcmp(dir->d_name, "dev")) {
 165                         if (!check_dev_match(dev, full_path)) {
 166                                 found = 1;
 167                                 break;
 168                         }
 169                 }
 170
 171                 if (stat(full_path, &st) == -1) {
 172                         perror("stat");
 173                         break;
 174                 }
 175
 176                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
 177                         continue;
 178
 179                 found = find_block_dir(dev, full_path);
 180                 if (found) {
 181                         strcpy(path, full_path);
 182                         break;
 183                 }
 184         }
 185
 186         closedir(D);
 187         return found;
 188 }
 189
 190 void init_disk_util(struct thread_data *td)
 191 {
 192         struct stat st;
 193         char foo[256], tmp[256];
 194         dev_t dev;
 195         char *p;
 196
 197         if (!td->do_disk_util)
 198                 return;
 199
 200         if (!stat(td->file_name, &st)) {
 201                 if (S_ISBLK(st.st_mode))
 202                         dev = st.st_rdev;
 203                 else
 204                         dev = st.st_dev;
 205         } else {
 206                 /*
 207                  * must be a file, open "." in that path
 208                  */
 209                 strcpy(foo, td->file_name);
 210                 p = dirname(foo);
 211                 if (stat(p, &st)) {
 212                         perror("disk util stat");
 213                         return;
 214                 }
 215
 216                 dev = st.st_dev;
 217         }
 218
 219         if (disk_util_exists(dev))
 220                 return;
 221
 222         sprintf(foo, "/sys/block");
 223         if (!find_block_dir(dev, foo))
 224                 return;
 225
 226         /*
 227          * If there's a ../queue/ directory there, we are inside a partition.
 228          * Check if that is the case and jump back. For loop/md/dm etc we
 229          * are already in the right spot.
 230          */
 231         sprintf(tmp, "%s/../queue", foo);
 232         if (!stat(tmp, &st)) {
 233                 p = dirname(foo);
 234                 sprintf(tmp, "%s/queue", p);
 235                 if (stat(tmp, &st)) {
 236                         fprintf(stderr, "unknown sysfs layout\n");
 237                         return;
 238                 }
 239                 sprintf(foo, "%s", p);
 240         }
 241
 242         td->sysfs_root = strdup(foo);
 243         disk_util_add(dev, foo);
 244 }
 245
 246 void disk_util_timer_arm(void)
 247 {
 248         itimer.it_value.tv_sec = 0;
 249         itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
 250         setitimer(ITIMER_REAL, &itimer, NULL);
 251 }
 252
 253 void update_rusage_stat(struct thread_data *td)
 254 {
 255         if (!(td->runtime[0] + td->runtime[1]))
 256                 return;
 257
 258         getrusage(RUSAGE_SELF, &td->ru_end);
 259
 260         td->usr_time += mtime_since(&td->ru_start.ru_utime, &td->ru_end.ru_utime);
 261         td->sys_time += mtime_since(&td->ru_start.ru_stime, &td->ru_end.ru_stime);
 262         td->ctx += td->ru_end.ru_nvcsw + td->ru_end.ru_nivcsw - (td->ru_start.ru_nvcsw + td->ru_start.ru_nivcsw);
 263
 264
 265         memcpy(&td->ru_start, &td->ru_end, sizeof(td->ru_end));
 266 }
 267
 268 static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
 269                     double *mean, double *dev)
 270 {
 271         double n;
 272
 273         if (is->samples == 0)
 274                 return 0;
 275
 276         *min = is->min_val;
 277         *max = is->max_val;
 278
 279         n = (double) is->samples;
 280         *mean = (double) is->val / n;
 281         *dev = sqrt(((double) is->val_sq - (*mean * *mean) / n) / (n - 1));
 282         if (!(*min + *max) && !(*mean + *dev))
 283                 return 0;
 284
 285         return 1;
 286 }
 287
 288 static void show_group_stats(struct group_run_stats *rs, int id)
 289 {
 290         printf("\nRun status group %d (all jobs):\n", id);
 291
 292         if (rs->max_run[DDIR_READ])
 293                 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]);
 294         if (rs->max_run[DDIR_WRITE])
 295                 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]);
 296 }
 297
 298 static void show_disk_util(void)
 299 {
 300         struct disk_util_stat *dus;
 301         struct list_head *entry;
 302         struct disk_util *du;
 303         double util;
 304
 305         printf("\nDisk stats (read/write):\n");
 306
 307         list_for_each(entry, &disk_list) {
 308                 du = list_entry(entry, struct disk_util, list);
 309                 dus = &du->dus;
 310
 311                 util = (double) 100 * du->dus.io_ticks / (double) du->msec;
 312                 if (util > 100.0)
 313                         util = 100.0;
 314
 315                 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);
 316         }
 317 }
 318
 319 static void show_ddir_status(struct thread_data *td, struct group_run_stats *rs,
 320                              int ddir)
 321 {
 322         char *ddir_str[] = { "read ", "write" };
 323         unsigned long min, max;
 324         unsigned long long bw;
 325         double mean, dev;
 326
 327         if (!td->runtime[ddir])
 328                 return;
 329
 330         bw = td->io_bytes[ddir] / td->runtime[ddir];
 331         printf("  %s: io=%6lluMiB, bw=%6lluKiB/s, runt=%6lumsec\n", ddir_str[ddir], td->io_bytes[ddir] >> 20, bw, td->runtime[ddir]);
 332
 333         if (calc_lat(&td->slat_stat[ddir], &min, &max, &mean, &dev))
 334                 printf("    slat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
 335
 336         if (calc_lat(&td->clat_stat[ddir], &min, &max, &mean, &dev))
 337                 printf("    clat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
 338
 339         if (calc_lat(&td->bw_stat[ddir], &min, &max, &mean, &dev)) {
 340                 double p_of_agg;
 341
 342                 p_of_agg = mean * 100 / (double) rs->agg[ddir];
 343                 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);
 344         }
 345 }
 346
 347 static void show_thread_status(struct thread_data *td,
 348                                struct group_run_stats *rs)
 349 {
 350         double usr_cpu, sys_cpu;
 351
 352         if (!(td->io_bytes[0] + td->io_bytes[1]) && !td->error)
 353                 return;
 354
 355         printf("%s: (groupid=%d): err=%2d:\n",td->name, td->groupid, td->error);
 356
 357         show_ddir_status(td, rs, td->ddir);
 358         if (td->io_bytes[td->ddir ^ 1])
 359                 show_ddir_status(td, rs, td->ddir ^ 1);
 360
 361         if (td->runtime[0] + td->runtime[1]) {
 362                 double runt = td->runtime[0] + td->runtime[1];
 363
 364                 usr_cpu = (double) td->usr_time * 100 / runt;
 365                 sys_cpu = (double) td->sys_time * 100 / runt;
 366         } else {
 367                 usr_cpu = 0;
 368                 sys_cpu = 0;
 369         }
 370
 371         printf("  cpu          : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu\n", usr_cpu, sys_cpu, td->ctx);
 372 }
 373
 374 void show_run_stats(void)
 375 {
 376         struct group_run_stats *runstats, *rs;
 377         struct thread_data *td;
 378         int i;
 379
 380         runstats = malloc(sizeof(struct group_run_stats) * (groupid + 1));
 381
 382         for (i = 0; i < groupid + 1; i++) {
 383                 rs = &runstats[i];
 384
 385                 memset(rs, 0, sizeof(*rs));
 386                 rs->min_bw[0] = rs->min_run[0] = ~0UL;
 387                 rs->min_bw[1] = rs->min_run[1] = ~0UL;
 388         }
 389
 390         for (i = 0; i < thread_number; i++) {
 391                 unsigned long long rbw, wbw;
 392
 393                 td = &threads[i];
 394
 395                 if (td->error) {
 396                         printf("%s: %s\n", td->name, td->verror);
 397                         continue;
 398                 }
 399
 400                 rs = &runstats[td->groupid];
 401
 402                 if (td->runtime[0] < rs->min_run[0] || !rs->min_run[0])
 403                         rs->min_run[0] = td->runtime[0];
 404                 if (td->runtime[0] > rs->max_run[0])
 405                         rs->max_run[0] = td->runtime[0];
 406                 if (td->runtime[1] < rs->min_run[1] || !rs->min_run[1])
 407                         rs->min_run[1] = td->runtime[1];
 408                 if (td->runtime[1] > rs->max_run[1])
 409                         rs->max_run[1] = td->runtime[1];
 410
 411                 rbw = wbw = 0;
 412                 if (td->runtime[0])
 413                         rbw = td->io_bytes[0] / (unsigned long long) td->runtime[0];
 414                 if (td->runtime[1])
 415                         wbw = td->io_bytes[1] / (unsigned long long) td->runtime[1];
 416
 417                 if (rbw < rs->min_bw[0])
 418                         rs->min_bw[0] = rbw;
 419                 if (wbw < rs->min_bw[1])
 420                         rs->min_bw[1] = wbw;
 421                 if (rbw > rs->max_bw[0])
 422                         rs->max_bw[0] = rbw;
 423                 if (wbw > rs->max_bw[1])
 424                         rs->max_bw[1] = wbw;
 425
 426                 rs->io_kb[0] += td->io_bytes[0] >> 10;
 427                 rs->io_kb[1] += td->io_bytes[1] >> 10;
 428         }
 429
 430         for (i = 0; i < groupid + 1; i++) {
 431                 rs = &runstats[i];
 432
 433                 if (rs->max_run[0])
 434                         rs->agg[0] = (rs->io_kb[0]*1024) / rs->max_run[0];
 435                 if (rs->max_run[1])
 436                         rs->agg[1] = (rs->io_kb[1]*1024) / rs->max_run[1];
 437         }
 438
 439         /*
 440          * don't overwrite last signal output
 441          */
 442         printf("\n");
 443
 444         for (i = 0; i < thread_number; i++) {
 445                 td = &threads[i];
 446                 rs = &runstats[td->groupid];
 447
 448                 show_thread_status(td, rs);
 449         }
 450
 451         for (i = 0; i < groupid + 1; i++)
 452                 show_group_stats(&runstats[i], i);
 453
 454         show_disk_util();
 455 }
 456
 457 static inline void add_stat_sample(struct io_stat *is, unsigned long val)
 458 {
 459         if (val > is->max_val)
 460                 is->max_val = val;
 461         if (val < is->min_val)
 462                 is->min_val = val;
 463
 464         is->val += val;
 465         is->val_sq += val * val;
 466         is->samples++;
 467 }
 468
 469 static void add_log_sample(struct thread_data *td, struct io_log *iolog,
 470                            unsigned long val, int ddir)
 471 {
 472         if (iolog->nr_samples == iolog->max_samples) {
 473                 int new_size = sizeof(struct io_sample) * iolog->max_samples*2;
 474
 475                 iolog->log = realloc(iolog->log, new_size);
 476                 iolog->max_samples <<= 1;
 477         }
 478
 479         iolog->log[iolog->nr_samples].val = val;
 480         iolog->log[iolog->nr_samples].time = mtime_since_now(&td->epoch);
 481         iolog->log[iolog->nr_samples].ddir = ddir;
 482         iolog->nr_samples++;
 483 }
 484
 485 void add_clat_sample(struct thread_data *td, int ddir, unsigned long msec)
 486 {
 487         add_stat_sample(&td->clat_stat[ddir], msec);
 488
 489         if (td->clat_log)
 490                 add_log_sample(td, td->clat_log, msec, ddir);
 491 }
 492
 493 void add_slat_sample(struct thread_data *td, int ddir, unsigned long msec)
 494 {
 495         add_stat_sample(&td->slat_stat[ddir], msec);
 496
 497         if (td->slat_log)
 498                 add_log_sample(td, td->slat_log, msec, ddir);
 499 }
 500
 501 void add_bw_sample(struct thread_data *td, int ddir)
 502 {
 503         unsigned long spent = mtime_since_now(&td->stat_sample_time[ddir]);
 504         unsigned long rate;
 505
 506         if (spent < td->bw_avg_time)
 507                 return;
 508
 509         rate = (td->this_io_bytes[ddir] - td->stat_io_bytes[ddir]) / spent;
 510         add_stat_sample(&td->bw_stat[ddir], rate);
 511
 512         if (td->bw_log)
 513                 add_log_sample(td, td->bw_log, rate, ddir);
 514
 515         gettimeofday(&td->stat_sample_time[ddir], NULL);
 516         td->stat_io_bytes[ddir] = td->this_io_bytes[ddir];
 517 }
 518
 519