tests/test_urcu_hash.c

   1 /*
   2  * test_urcu_hash.c
   3  *
   4  * Userspace RCU library - test program
   5  *
   6  * Copyright 2009-2012 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #define _GNU_SOURCE
  24 #include "test_urcu_hash.h"
  25
  26 enum test_hash {
  27         TEST_HASH_RW,
  28         TEST_HASH_UNIQUE,
  29 };
  30
  31 struct test_hash_cb {
  32         void (*sigusr1)(int signo);
  33         void (*sigusr2)(int signo);
  34         void *(*thr_reader)(void *_count);
  35         void *(*thr_writer)(void *_count);
  36         int (*populate_hash)(void);
  37 };
  38
  39 static
  40 struct test_hash_cb test_hash_cb[] = {
  41         [TEST_HASH_RW] = {
  42                 test_hash_rw_sigusr1_handler,
  43                 test_hash_rw_sigusr2_handler,
  44                 test_hash_rw_thr_reader,
  45                 test_hash_rw_thr_writer,
  46                 test_hash_rw_populate_hash,
  47         },
  48         [TEST_HASH_UNIQUE] = {
  49                 test_hash_unique_sigusr1_handler,
  50                 test_hash_unique_sigusr2_handler,
  51                 test_hash_unique_thr_reader,
  52                 test_hash_unique_thr_writer,
  53                 test_hash_unique_populate_hash,
  54         },
  55
  56 };
  57
  58 static enum test_hash test_choice = TEST_HASH_RW;
  59
  60 void (*get_sigusr1_cb(void))(int)
  61 {
  62         return test_hash_cb[test_choice].sigusr1;
  63 }
  64
  65 void (*get_sigusr2_cb(void))(int)
  66 {
  67         return test_hash_cb[test_choice].sigusr2;
  68 }
  69
  70 void *(*get_thr_reader_cb(void))(void *)
  71 {
  72         return test_hash_cb[test_choice].thr_reader;
  73 }
  74
  75 void *(*get_thr_writer_cb(void))(void *)
  76 {
  77         return test_hash_cb[test_choice].thr_writer;
  78 }
  79
  80 int (*get_populate_hash_cb(void))(void)
  81 {
  82         return test_hash_cb[test_choice].populate_hash;
  83 }
  84
  85 DEFINE_URCU_TLS(unsigned int, rand_lookup);
  86 DEFINE_URCU_TLS(unsigned long, nr_add);
  87 DEFINE_URCU_TLS(unsigned long, nr_addexist);
  88 DEFINE_URCU_TLS(unsigned long, nr_del);
  89 DEFINE_URCU_TLS(unsigned long, nr_delnoent);
  90 DEFINE_URCU_TLS(unsigned long, lookup_fail);
  91 DEFINE_URCU_TLS(unsigned long, lookup_ok);
  92
  93 struct cds_lfht *test_ht;
  94
  95 volatile int test_go, test_stop;
  96
  97 unsigned long wdelay;
  98
  99 unsigned long duration;
 100
 101 /* read-side C.S. duration, in loops */
 102 unsigned long rduration;
 103
 104 unsigned long init_hash_size = DEFAULT_HASH_SIZE;
 105 unsigned long min_hash_alloc_size = DEFAULT_MIN_ALLOC_SIZE;
 106 unsigned long max_hash_buckets_size = (1UL << 20);
 107 unsigned long init_populate;
 108 int opt_auto_resize;
 109 int add_only, add_unique, add_replace;
 110 const struct cds_lfht_mm_type *memory_backend;
 111
 112 unsigned long init_pool_offset, lookup_pool_offset, write_pool_offset;
 113 unsigned long init_pool_size = DEFAULT_RAND_POOL,
 114         lookup_pool_size = DEFAULT_RAND_POOL,
 115         write_pool_size = DEFAULT_RAND_POOL;
 116 int validate_lookup;
 117 unsigned long nr_hash_chains;   /* 0: normal table, other: number of hash chains */
 118
 119 int count_pipe[2];
 120
 121 int verbose_mode;
 122
 123 unsigned int cpu_affinities[NR_CPUS];
 124 unsigned int next_aff = 0;
 125 int use_affinity = 0;
 126
 127 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 128
 129 DEFINE_URCU_TLS(unsigned long long, nr_writes);
 130 DEFINE_URCU_TLS(unsigned long long, nr_reads);
 131
 132 unsigned int nr_readers;
 133 unsigned int nr_writers;
 134
 135 static pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 136
 137 void set_affinity(void)
 138 {
 139         cpu_set_t mask;
 140         int cpu;
 141         int ret;
 142
 143         if (!use_affinity)
 144                 return;
 145
 146 #if HAVE_SCHED_SETAFFINITY
 147         ret = pthread_mutex_lock(&affinity_mutex);
 148         if (ret) {
 149                 perror("Error in pthread mutex lock");
 150                 exit(-1);
 151         }
 152         cpu = cpu_affinities[next_aff++];
 153         ret = pthread_mutex_unlock(&affinity_mutex);
 154         if (ret) {
 155                 perror("Error in pthread mutex unlock");
 156                 exit(-1);
 157         }
 158         CPU_ZERO(&mask);
 159         CPU_SET(cpu, &mask);
 160 #if SCHED_SETAFFINITY_ARGS == 2
 161         sched_setaffinity(0, &mask);
 162 #else
 163         sched_setaffinity(0, sizeof(mask), &mask);
 164 #endif
 165 #endif /* HAVE_SCHED_SETAFFINITY */
 166 }
 167
 168 void rcu_copy_mutex_lock(void)
 169 {
 170         int ret;
 171         ret = pthread_mutex_lock(&rcu_copy_mutex);
 172         if (ret) {
 173                 perror("Error in pthread mutex lock");
 174                 exit(-1);
 175         }
 176 }
 177
 178 void rcu_copy_mutex_unlock(void)
 179 {
 180         int ret;
 181
 182         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 183         if (ret) {
 184                 perror("Error in pthread mutex unlock");
 185                 exit(-1);
 186         }
 187 }
 188
 189 unsigned long test_compare(const void *key1, size_t key1_len,
 190                            const void *key2, size_t key2_len)
 191 {
 192         if (caa_unlikely(key1_len != key2_len))
 193                 return -1;
 194         assert(key1_len == sizeof(unsigned long));
 195         if (key1 == key2)
 196                 return 0;
 197         else
 198                 return 1;
 199 }
 200
 201 void *thr_count(void *arg)
 202 {
 203         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 204                         "counter", (unsigned long) pthread_self(),
 205                         (unsigned long) gettid());
 206
 207         rcu_register_thread();
 208
 209         for (;;) {
 210                 unsigned long count;
 211                 long approx_before, approx_after;
 212                 ssize_t len;
 213                 char buf[1];
 214
 215                 rcu_thread_offline();
 216                 len = read(count_pipe[0], buf, 1);
 217                 rcu_thread_online();
 218                 if (caa_unlikely(!test_duration_read()))
 219                         break;
 220                 if (len != 1)
 221                         continue;
 222                 /* Accounting */
 223                 printf("Counting nodes... ");
 224                 fflush(stdout);
 225                 rcu_read_lock();
 226                 cds_lfht_count_nodes(test_ht, &approx_before, &count,
 227                                 &approx_after);
 228                 rcu_read_unlock();
 229                 printf("done.\n");
 230                 printf("Approximation before node accounting: %ld nodes.\n",
 231                         approx_before);
 232                 printf("Accounting of nodes in the hash table: "
 233                         "%lu nodes.\n",
 234                         count);
 235                 printf("Approximation after node accounting: %ld nodes.\n",
 236                         approx_after);
 237         }
 238         rcu_unregister_thread();
 239         return NULL;
 240 }
 241
 242 void free_node_cb(struct rcu_head *head)
 243 {
 244         struct lfht_test_node *node =
 245                 caa_container_of(head, struct lfht_test_node, head);
 246         free(node);
 247 }
 248
 249 static
 250 void test_delete_all_nodes(struct cds_lfht *ht)
 251 {
 252         struct cds_lfht_iter iter;
 253         struct lfht_test_node *node;
 254         unsigned long count = 0;
 255
 256         cds_lfht_for_each_entry(ht, &iter, node, node) {
 257                 int ret;
 258
 259                 ret = cds_lfht_del(test_ht, cds_lfht_iter_get_node(&iter));
 260                 assert(!ret);
 261                 call_rcu(&node->head, free_node_cb);
 262                 count++;
 263         }
 264         printf("deleted %lu nodes.\n", count);
 265 }
 266
 267 void show_usage(int argc, char **argv)
 268 {
 269         printf("Usage : %s nr_readers nr_writers duration (s)\n", argv[0]);
 270 #ifdef DEBUG_YIELD
 271         printf("        [-r] [-w] (yield reader and/or writer)\n");
 272 #endif
 273         printf("        [-d delay] (writer period (us))\n");
 274         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 275         printf("        [-v] (verbose output)\n");
 276         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 277         printf("        [-h size] (initial number of buckets)\n");
 278         printf("        [-m size] (minimum number of allocated buckets)\n");
 279         printf("        [-n size] (maximum number of buckets)\n");
 280 printf("        [not -u nor -s] Add entries (supports redundant keys).\n");
 281         printf("        [-u] Uniquify add (no redundant keys).\n");
 282         printf("        [-s] Replace (swap) entries.\n");
 283         printf("        [-i] Add only (no removal).\n");
 284         printf("        [-k nr_nodes] Number of nodes to insert initially.\n");
 285         printf("        [-A] Automatically resize hash table.\n");
 286         printf("        [-B order|chunk|mmap] Specify the memory backend.\n");
 287         printf("        [-R offset] Lookup pool offset.\n");
 288         printf("        [-S offset] Write pool offset.\n");
 289         printf("        [-T offset] Init pool offset.\n");
 290         printf("        [-M size] Lookup pool size.\n");
 291         printf("        [-N size] Write pool size.\n");
 292         printf("        [-O size] Init pool size.\n");
 293         printf("        [-V] Validate lookups of init values (use with filled init pool, same lookup range, with different write range).\n");
 294         printf("        [-U] Uniqueness test.\n");
 295         printf("        [-C] Number of hash chains.\n");
 296         printf("\n\n");
 297 }
 298
 299 int main(int argc, char **argv)
 300 {
 301         int err;
 302         pthread_t *tid_reader, *tid_writer;
 303         pthread_t tid_count;
 304         void *tret;
 305         unsigned long long *count_reader;
 306         struct wr_count *count_writer;
 307         unsigned long long tot_reads = 0, tot_writes = 0,
 308                 tot_add = 0, tot_add_exist = 0, tot_remove = 0;
 309         unsigned long count;
 310         long approx_before, approx_after;
 311         int i, a, ret;
 312         struct sigaction act;
 313         unsigned int remain;
 314
 315         if (argc < 4) {
 316                 show_usage(argc, argv);
 317                 return -1;
 318         }
 319
 320         err = sscanf(argv[1], "%u", &nr_readers);
 321         if (err != 1) {
 322                 show_usage(argc, argv);
 323                 return -1;
 324         }
 325
 326         err = sscanf(argv[2], "%u", &nr_writers);
 327         if (err != 1) {
 328                 show_usage(argc, argv);
 329                 return -1;
 330         }
 331
 332         err = sscanf(argv[3], "%lu", &duration);
 333         if (err != 1) {
 334                 show_usage(argc, argv);
 335                 return -1;
 336         }
 337
 338         for (i = 4; i < argc; i++) {
 339                 if (argv[i][0] != '-')
 340                         continue;
 341                 switch (argv[i][1]) {
 342 #ifdef DEBUG_YIELD
 343                 case 'r':
 344                         yield_active |= YIELD_READ;
 345                         break;
 346                 case 'w':
 347                         yield_active |= YIELD_WRITE;
 348                         break;
 349 #endif
 350                 case 'a':
 351                         if (argc < i + 2) {
 352                                 show_usage(argc, argv);
 353                                 return -1;
 354                         }
 355                         a = atoi(argv[++i]);
 356                         cpu_affinities[next_aff++] = a;
 357                         use_affinity = 1;
 358                         printf_verbose("Adding CPU %d affinity\n", a);
 359                         break;
 360                 case 'c':
 361                         if (argc < i + 2) {
 362                                 show_usage(argc, argv);
 363                                 return -1;
 364                         }
 365                         rduration = atol(argv[++i]);
 366                         break;
 367                 case 'd':
 368                         if (argc < i + 2) {
 369                                 show_usage(argc, argv);
 370                                 return -1;
 371                         }
 372                         wdelay = atol(argv[++i]);
 373                         break;
 374                 case 'v':
 375                         verbose_mode = 1;
 376                         break;
 377                 case 'h':
 378                         if (argc < i + 2) {
 379                                 show_usage(argc, argv);
 380                                 return -1;
 381                         }
 382                         init_hash_size = atol(argv[++i]);
 383                         break;
 384                 case 'm':
 385                         if (argc < i + 2) {
 386                                 show_usage(argc, argv);
 387                                 return -1;
 388                         }
 389                         min_hash_alloc_size = atol(argv[++i]);
 390                         break;
 391                 case 'n':
 392                         if (argc < i + 2) {
 393                                 show_usage(argc, argv);
 394                                 return -1;
 395                         }
 396                         max_hash_buckets_size = atol(argv[++i]);
 397                         break;
 398                 case 'u':
 399                         if (add_replace) {
 400                                 printf("Please specify at most one of -s or -u.\n");
 401                                 exit(-1);
 402                         }
 403                         add_unique = 1;
 404                         break;
 405                 case 's':
 406                         if (add_unique) {
 407                                 printf("Please specify at most one of -s or -u.\n");
 408                                 exit(-1);
 409                         }
 410                         add_replace = 1;
 411                         break;
 412                 case 'i':
 413                         add_only = 1;
 414                         break;
 415                 case 'k':
 416                         init_populate = atol(argv[++i]);
 417                         break;
 418                 case 'A':
 419                         opt_auto_resize = 1;
 420                         break;
 421                 case 'B':
 422                         if (argc < i + 2) {
 423                                 show_usage(argc, argv);
 424                                 return -1;
 425                         }
 426                         i++;
 427                         if (!strcmp("order", argv[i]))
 428                                 memory_backend = &cds_lfht_mm_order;
 429                         else if (!strcmp("chunk", argv[i]))
 430                                 memory_backend = &cds_lfht_mm_chunk;
 431                         else if (!strcmp("mmap", argv[i]))
 432                                 memory_backend = &cds_lfht_mm_mmap;
 433                         else {
 434                                 printf("Please specify memory backend with order|chunk|mmap.\n");
 435                                 exit(-1);
 436                         }
 437                         break;
 438                 case 'R':
 439                         lookup_pool_offset = atol(argv[++i]);
 440                         break;
 441                 case 'S':
 442                         write_pool_offset = atol(argv[++i]);
 443                         break;
 444                 case 'T':
 445                         init_pool_offset = atol(argv[++i]);
 446                         break;
 447                 case 'M':
 448                         lookup_pool_size = atol(argv[++i]);
 449                         break;
 450                 case 'N':
 451                         write_pool_size = atol(argv[++i]);
 452                         break;
 453                 case 'O':
 454                         init_pool_size = atol(argv[++i]);
 455                         break;
 456                 case 'V':
 457                         validate_lookup = 1;
 458                         break;
 459                 case 'U':
 460                         test_choice = TEST_HASH_UNIQUE;
 461                         break;
 462                 case 'C':
 463                         nr_hash_chains = atol(argv[++i]);
 464                         break;
 465                 }
 466         }
 467
 468         /* Check if hash size is power of 2 */
 469         if (init_hash_size && init_hash_size & (init_hash_size - 1)) {
 470                 printf("Error: Initial number of buckets (%lu) is not a power of 2.\n",
 471                         init_hash_size);
 472                 return -1;
 473         }
 474
 475         if (min_hash_alloc_size && min_hash_alloc_size & (min_hash_alloc_size - 1)) {
 476                 printf("Error: Minimum number of allocated buckets (%lu) is not a power of 2.\n",
 477                         min_hash_alloc_size);
 478                 return -1;
 479         }
 480
 481         if (max_hash_buckets_size && max_hash_buckets_size & (max_hash_buckets_size - 1)) {
 482                 printf("Error: Maximum number of buckets (%lu) is not a power of 2.\n",
 483                         max_hash_buckets_size);
 484                 return -1;
 485         }
 486
 487         memset(&act, 0, sizeof(act));
 488         ret = sigemptyset(&act.sa_mask);
 489         if (ret == -1) {
 490                 perror("sigemptyset");
 491                 return -1;
 492         }
 493         act.sa_handler = get_sigusr1_cb();
 494         act.sa_flags = SA_RESTART;
 495         ret = sigaction(SIGUSR1, &act, NULL);
 496         if (ret == -1) {
 497                 perror("sigaction");
 498                 return -1;
 499         }
 500
 501         ret = pipe(count_pipe);
 502         if (ret == -1) {
 503                 perror("pipe");
 504                 return -1;
 505         }
 506
 507         /* spawn counter thread */
 508         err = pthread_create(&tid_count, NULL, thr_count,
 509                              NULL);
 510         if (err != 0)
 511                 exit(1);
 512
 513         act.sa_handler = get_sigusr2_cb();
 514         act.sa_flags = SA_RESTART;
 515         ret = sigaction(SIGUSR2, &act, NULL);
 516         if (ret == -1) {
 517                 perror("sigaction");
 518                 return -1;
 519         }
 520
 521         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 522                 duration, nr_readers, nr_writers);
 523         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 524         printf_verbose("Reader duration : %lu loops.\n", rduration);
 525         printf_verbose("Mode:%s%s.\n",
 526                 add_only ? " add only" : " add/remove",
 527                 add_unique ? " uniquify" : ( add_replace ? " replace" : " insert"));
 528         printf_verbose("Initial number of buckets: %lu buckets.\n", init_hash_size);
 529         printf_verbose("Minimum number of allocated buckets: %lu buckets.\n", min_hash_alloc_size);
 530         printf_verbose("Maximum number of buckets: %lu buckets.\n", max_hash_buckets_size);
 531         printf_verbose("Init pool size offset %lu size %lu.\n",
 532                 init_pool_offset, init_pool_size);
 533         printf_verbose("Lookup pool size offset %lu size %lu.\n",
 534                 lookup_pool_offset, lookup_pool_size);
 535         printf_verbose("Update pool size offset %lu size %lu.\n",
 536                 write_pool_offset, write_pool_size);
 537         printf_verbose("Number of hash chains: %lu.\n",
 538                 nr_hash_chains);
 539         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 540                         "main", (unsigned long) pthread_self(),
 541                         (unsigned long) gettid());
 542
 543         tid_reader = calloc(nr_readers, sizeof(*tid_reader));
 544         tid_writer = calloc(nr_writers, sizeof(*tid_writer));
 545         count_reader = calloc(nr_readers, sizeof(*count_reader));
 546         count_writer = calloc(nr_writers, sizeof(*count_writer));
 547
 548         err = create_all_cpu_call_rcu_data(0);
 549         if (err) {
 550                 printf("Per-CPU call_rcu() worker threads unavailable. Using default global worker thread.\n");
 551         }
 552
 553         if (memory_backend) {
 554                 test_ht = _cds_lfht_new(init_hash_size, min_hash_alloc_size,
 555                                 max_hash_buckets_size,
 556                                 (opt_auto_resize ? CDS_LFHT_AUTO_RESIZE : 0) |
 557                                 CDS_LFHT_ACCOUNTING, memory_backend,
 558                                 &rcu_flavor, NULL);
 559         } else {
 560                 test_ht = cds_lfht_new(init_hash_size, min_hash_alloc_size,
 561                                 max_hash_buckets_size,
 562                                 (opt_auto_resize ? CDS_LFHT_AUTO_RESIZE : 0) |
 563                                 CDS_LFHT_ACCOUNTING, NULL);
 564         }
 565         if (!test_ht) {
 566                 printf("Error allocating hash table.\n");
 567                 return -1;
 568         }
 569
 570         /*
 571          * Hash Population needs to be seen as a RCU reader
 572          * thread from the point of view of resize.
 573          */
 574         rcu_register_thread();
 575         ret = (get_populate_hash_cb())();
 576         assert(!ret);
 577
 578         rcu_thread_offline();
 579
 580         next_aff = 0;
 581
 582         for (i = 0; i < nr_readers; i++) {
 583                 err = pthread_create(&tid_reader[i],
 584                                      NULL, get_thr_reader_cb(),
 585                                      &count_reader[i]);
 586                 if (err != 0)
 587                         exit(1);
 588         }
 589         for (i = 0; i < nr_writers; i++) {
 590                 err = pthread_create(&tid_writer[i],
 591                                      NULL, get_thr_writer_cb(),
 592                                      &count_writer[i]);
 593                 if (err != 0)
 594                         exit(1);
 595         }
 596
 597         cmm_smp_mb();
 598
 599         test_go = 1;
 600
 601         remain = duration;
 602         do {
 603                 remain = sleep(remain);
 604         } while (remain > 0);
 605
 606         test_stop = 1;
 607
 608         for (i = 0; i < nr_readers; i++) {
 609                 err = pthread_join(tid_reader[i], &tret);
 610                 if (err != 0)
 611                         exit(1);
 612                 tot_reads += count_reader[i];
 613         }
 614         for (i = 0; i < nr_writers; i++) {
 615                 err = pthread_join(tid_writer[i], &tret);
 616                 if (err != 0)
 617                         exit(1);
 618                 tot_writes += count_writer[i].update_ops;
 619                 tot_add += count_writer[i].add;
 620                 tot_add_exist += count_writer[i].add_exist;
 621                 tot_remove += count_writer[i].remove;
 622         }
 623
 624         /* teardown counter thread */
 625         act.sa_handler = SIG_IGN;
 626         act.sa_flags = SA_RESTART;
 627         ret = sigaction(SIGUSR2, &act, NULL);
 628         if (ret == -1) {
 629                 perror("sigaction");
 630                 return -1;
 631         }
 632         {
 633                 char msg[1] = { 0x42 };
 634                 ssize_t ret;
 635
 636                 do {
 637                         ret = write(count_pipe[1], msg, 1);     /* wakeup thread */
 638                 } while (ret == -1L && errno == EINTR);
 639         }
 640         err = pthread_join(tid_count, &tret);
 641         if (err != 0)
 642                 exit(1);
 643
 644         fflush(stdout);
 645         rcu_thread_online();
 646         rcu_read_lock();
 647         printf("Counting nodes... ");
 648         cds_lfht_count_nodes(test_ht, &approx_before, &count, &approx_after);
 649         printf("done.\n");
 650         test_delete_all_nodes(test_ht);
 651         rcu_read_unlock();
 652         rcu_thread_offline();
 653         if (count) {
 654                 printf("Approximation before node accounting: %ld nodes.\n",
 655                         approx_before);
 656                 printf("Nodes deleted from hash table before destroy: "
 657                         "%lu nodes.\n",
 658                         count);
 659                 printf("Approximation after node accounting: %ld nodes.\n",
 660                         approx_after);
 661         }
 662         ret = cds_lfht_destroy(test_ht, NULL);
 663         if (ret)
 664                 printf_verbose("final delete aborted\n");
 665         else
 666                 printf_verbose("final delete success\n");
 667         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 668                tot_writes);
 669         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
 670                 "nr_writers %3u "
 671                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
 672                 "nr_add %12llu nr_add_fail %12llu nr_remove %12llu nr_leaked %12lld\n",
 673                 argv[0], duration, nr_readers, rduration,
 674                 nr_writers, wdelay, tot_reads, tot_writes,
 675                 tot_reads + tot_writes, tot_add, tot_add_exist, tot_remove,
 676                 (long long) tot_add + init_populate - tot_remove - count);
 677         rcu_unregister_thread();
 678         free_all_cpu_call_rcu_data();
 679         free(tid_reader);
 680         free(tid_writer);
 681         free(count_reader);
 682         free(count_writer);
 683         return 0;
 684 }