tests/benchmark/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 #if HAVE_SCHED_SETAFFINITY
 140         cpu_set_t mask;
 141         int cpu, ret;
 142 #endif /* HAVE_SCHED_SETAFFINITY */
 143
 144         if (!use_affinity)
 145                 return;
 146
 147 #if HAVE_SCHED_SETAFFINITY
 148         ret = pthread_mutex_lock(&affinity_mutex);
 149         if (ret) {
 150                 perror("Error in pthread mutex lock");
 151                 exit(-1);
 152         }
 153         cpu = cpu_affinities[next_aff++];
 154         ret = pthread_mutex_unlock(&affinity_mutex);
 155         if (ret) {
 156                 perror("Error in pthread mutex unlock");
 157                 exit(-1);
 158         }
 159         CPU_ZERO(&mask);
 160         CPU_SET(cpu, &mask);
 161 #if SCHED_SETAFFINITY_ARGS == 2
 162         sched_setaffinity(0, &mask);
 163 #else
 164         sched_setaffinity(0, sizeof(mask), &mask);
 165 #endif
 166 #endif /* HAVE_SCHED_SETAFFINITY */
 167 }
 168
 169 void rcu_copy_mutex_lock(void)
 170 {
 171         int ret;
 172         ret = pthread_mutex_lock(&rcu_copy_mutex);
 173         if (ret) {
 174                 perror("Error in pthread mutex lock");
 175                 exit(-1);
 176         }
 177 }
 178
 179 void rcu_copy_mutex_unlock(void)
 180 {
 181         int ret;
 182
 183         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 184         if (ret) {
 185                 perror("Error in pthread mutex unlock");
 186                 exit(-1);
 187         }
 188 }
 189
 190 unsigned long test_compare(const void *key1, size_t key1_len,
 191                            const void *key2, size_t key2_len)
 192 {
 193         if (caa_unlikely(key1_len != key2_len))
 194                 return -1;
 195         assert(key1_len == sizeof(unsigned long));
 196         if (key1 == key2)
 197                 return 0;
 198         else
 199                 return 1;
 200 }
 201
 202 void *thr_count(void *arg)
 203 {
 204         printf_verbose("thread_begin %s, tid %lu\n",
 205                         "counter", urcu_get_thread_id());
 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) <OPTIONS>\n",
 270                 argv[0]);
 271         printf("OPTIONS:\n");
 272         printf("        [-r] [-w] (yield reader and/or writer)\n");
 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.\n");
 294         printf("                (use with filled init pool, same lookup range,\n");
 295         printf("                with different write range)\n");
 296         printf("        [-U] Uniqueness test.\n");
 297         printf("        [-C] Number of hash chains.\n");
 298         printf("\n");
 299 }
 300
 301 int main(int argc, char **argv)
 302 {
 303         pthread_t *tid_reader, *tid_writer;
 304         pthread_t tid_count;
 305         void *tret;
 306         unsigned long long *count_reader;
 307         struct wr_count *count_writer;
 308         unsigned long long tot_reads = 0, tot_writes = 0,
 309                 tot_add = 0, tot_add_exist = 0, tot_remove = 0;
 310         unsigned long count;
 311         long approx_before, approx_after;
 312         int i, a, ret, err, mainret = 0;
 313         struct sigaction act;
 314         unsigned int remain;
 315         unsigned int nr_readers_created = 0, nr_writers_created = 0;
 316         long long nr_leaked;
 317
 318         if (argc < 4) {
 319                 show_usage(argc, argv);
 320                 mainret = 1;
 321                 goto end;
 322         }
 323
 324         err = sscanf(argv[1], "%u", &nr_readers);
 325         if (err != 1) {
 326                 show_usage(argc, argv);
 327                 mainret = 1;
 328                 goto end;
 329         }
 330
 331         err = sscanf(argv[2], "%u", &nr_writers);
 332         if (err != 1) {
 333                 show_usage(argc, argv);
 334                 mainret = 1;
 335                 goto end;
 336         }
 337
 338         err = sscanf(argv[3], "%lu", &duration);
 339         if (err != 1) {
 340                 show_usage(argc, argv);
 341                 mainret = 1;
 342                 goto end;
 343         }
 344
 345         for (i = 4; i < argc; i++) {
 346                 if (argv[i][0] != '-')
 347                         continue;
 348                 switch (argv[i][1]) {
 349                 case 'r':
 350                         rcu_debug_yield_enable(RCU_YIELD_READ);
 351                         break;
 352                 case 'w':
 353                         rcu_debug_yield_enable(RCU_YIELD_WRITE);
 354                         break;
 355                 case 'a':
 356                         if (argc < i + 2) {
 357                                 show_usage(argc, argv);
 358                                 mainret = 1;
 359                                 goto end;
 360                         }
 361                         a = atoi(argv[++i]);
 362                         cpu_affinities[next_aff++] = a;
 363                         use_affinity = 1;
 364                         printf_verbose("Adding CPU %d affinity\n", a);
 365                         break;
 366                 case 'c':
 367                         if (argc < i + 2) {
 368                                 show_usage(argc, argv);
 369                                 mainret = 1;
 370                                 goto end;
 371                         }
 372                         rduration = atol(argv[++i]);
 373                         break;
 374                 case 'd':
 375                         if (argc < i + 2) {
 376                                 show_usage(argc, argv);
 377                                 mainret = 1;
 378                                 goto end;
 379                         }
 380                         wdelay = atol(argv[++i]);
 381                         break;
 382                 case 'v':
 383                         verbose_mode = 1;
 384                         break;
 385                 case 'h':
 386                         if (argc < i + 2) {
 387                                 show_usage(argc, argv);
 388                                 mainret = 1;
 389                                 goto end;
 390                         }
 391                         init_hash_size = atol(argv[++i]);
 392                         break;
 393                 case 'm':
 394                         if (argc < i + 2) {
 395                                 show_usage(argc, argv);
 396                                 mainret = 1;
 397                                 goto end;
 398                         }
 399                         min_hash_alloc_size = atol(argv[++i]);
 400                         break;
 401                 case 'n':
 402                         if (argc < i + 2) {
 403                                 show_usage(argc, argv);
 404                                 mainret = 1;
 405                                 goto end;
 406                         }
 407                         max_hash_buckets_size = atol(argv[++i]);
 408                         break;
 409                 case 'u':
 410                         if (add_replace) {
 411                                 printf("Please specify at most one of -s or -u.\n");
 412                                 exit(-1);
 413                         }
 414                         add_unique = 1;
 415                         break;
 416                 case 's':
 417                         if (add_unique) {
 418                                 printf("Please specify at most one of -s or -u.\n");
 419                                 exit(-1);
 420                         }
 421                         add_replace = 1;
 422                         break;
 423                 case 'i':
 424                         add_only = 1;
 425                         break;
 426                 case 'k':
 427                         init_populate = atol(argv[++i]);
 428                         break;
 429                 case 'A':
 430                         opt_auto_resize = 1;
 431                         break;
 432                 case 'B':
 433                         if (argc < i + 2) {
 434                                 show_usage(argc, argv);
 435                                 mainret = 1;
 436                                 goto end;
 437                         }
 438                         i++;
 439                         if (!strcmp("order", argv[i]))
 440                                 memory_backend = &cds_lfht_mm_order;
 441                         else if (!strcmp("chunk", argv[i]))
 442                                 memory_backend = &cds_lfht_mm_chunk;
 443                         else if (!strcmp("mmap", argv[i]))
 444                                 memory_backend = &cds_lfht_mm_mmap;
 445                         else {
 446                                 printf("Please specify memory backend with order|chunk|mmap.\n");
 447                                 mainret = 1;
 448                                 goto end;
 449                         }
 450                         break;
 451                 case 'R':
 452                         lookup_pool_offset = atol(argv[++i]);
 453                         break;
 454                 case 'S':
 455                         write_pool_offset = atol(argv[++i]);
 456                         break;
 457                 case 'T':
 458                         init_pool_offset = atol(argv[++i]);
 459                         break;
 460                 case 'M':
 461                         lookup_pool_size = atol(argv[++i]);
 462                         break;
 463                 case 'N':
 464                         write_pool_size = atol(argv[++i]);
 465                         break;
 466                 case 'O':
 467                         init_pool_size = atol(argv[++i]);
 468                         break;
 469                 case 'V':
 470                         validate_lookup = 1;
 471                         break;
 472                 case 'U':
 473                         test_choice = TEST_HASH_UNIQUE;
 474                         break;
 475                 case 'C':
 476                         nr_hash_chains = atol(argv[++i]);
 477                         break;
 478                 }
 479         }
 480
 481         /* Check if hash size is power of 2 */
 482         if (init_hash_size && init_hash_size & (init_hash_size - 1)) {
 483                 printf("Error: Initial number of buckets (%lu) is not a power of 2.\n",
 484                         init_hash_size);
 485                 mainret = 1;
 486                 goto end;
 487         }
 488
 489         if (min_hash_alloc_size && min_hash_alloc_size & (min_hash_alloc_size - 1)) {
 490                 printf("Error: Minimum number of allocated buckets (%lu) is not a power of 2.\n",
 491                         min_hash_alloc_size);
 492                 mainret = 1;
 493                 goto end;
 494         }
 495
 496         if (max_hash_buckets_size && max_hash_buckets_size & (max_hash_buckets_size - 1)) {
 497                 printf("Error: Maximum number of buckets (%lu) is not a power of 2.\n",
 498                         max_hash_buckets_size);
 499                 mainret = 1;
 500                 goto end;
 501         }
 502
 503         memset(&act, 0, sizeof(act));
 504         ret = sigemptyset(&act.sa_mask);
 505         if (ret == -1) {
 506                 perror("sigemptyset");
 507                 mainret = 1;
 508                 goto end;
 509         }
 510         act.sa_handler = get_sigusr1_cb();
 511         act.sa_flags = SA_RESTART;
 512         ret = sigaction(SIGUSR1, &act, NULL);
 513         if (ret == -1) {
 514                 perror("sigaction");
 515                 mainret = 1;
 516                 goto end;
 517         }
 518
 519         act.sa_handler = get_sigusr2_cb();
 520         act.sa_flags = SA_RESTART;
 521         ret = sigaction(SIGUSR2, &act, NULL);
 522         if (ret == -1) {
 523                 perror("sigaction");
 524                 mainret = 1;
 525                 goto end;
 526         }
 527
 528         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 529                 duration, nr_readers, nr_writers);
 530         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 531         printf_verbose("Reader duration : %lu loops.\n", rduration);
 532         printf_verbose("Mode:%s%s.\n",
 533                 add_only ? " add only" : " add/remove",
 534                 add_unique ? " uniquify" : ( add_replace ? " replace" : " insert"));
 535         printf_verbose("Initial number of buckets: %lu buckets.\n", init_hash_size);
 536         printf_verbose("Minimum number of allocated buckets: %lu buckets.\n", min_hash_alloc_size);
 537         printf_verbose("Maximum number of buckets: %lu buckets.\n", max_hash_buckets_size);
 538         printf_verbose("Init pool size offset %lu size %lu.\n",
 539                 init_pool_offset, init_pool_size);
 540         printf_verbose("Lookup pool size offset %lu size %lu.\n",
 541                 lookup_pool_offset, lookup_pool_size);
 542         printf_verbose("Update pool size offset %lu size %lu.\n",
 543                 write_pool_offset, write_pool_size);
 544         printf_verbose("Number of hash chains: %lu.\n",
 545                 nr_hash_chains);
 546         printf_verbose("thread %-6s, tid %lu\n",
 547                         "main", urcu_get_thread_id());
 548
 549         tid_reader = calloc(nr_readers, sizeof(*tid_reader));
 550         if (!tid_reader) {
 551                 mainret = 1;
 552                 goto end;
 553         }
 554         tid_writer = calloc(nr_writers, sizeof(*tid_writer));
 555         if (!tid_writer) {
 556                 mainret = 1;
 557                 goto end_free_tid_reader;
 558         }
 559         count_reader = calloc(nr_readers, sizeof(*count_reader));
 560         if (!count_reader) {
 561                 mainret = 1;
 562                 goto end_free_tid_writer;
 563         }
 564         count_writer = calloc(nr_writers, sizeof(*count_writer));
 565         if (!count_writer) {
 566                 mainret = 1;
 567                 goto end_free_count_reader;
 568         }
 569
 570         err = create_all_cpu_call_rcu_data(0);
 571         if (err) {
 572                 printf("Per-CPU call_rcu() worker threads unavailable. Using default global worker thread.\n");
 573         }
 574
 575         if (memory_backend) {
 576                 test_ht = _cds_lfht_new(init_hash_size, min_hash_alloc_size,
 577                                 max_hash_buckets_size,
 578                                 (opt_auto_resize ? CDS_LFHT_AUTO_RESIZE : 0) |
 579                                 CDS_LFHT_ACCOUNTING, memory_backend,
 580                                 &rcu_flavor, NULL);
 581         } else {
 582                 test_ht = cds_lfht_new(init_hash_size, min_hash_alloc_size,
 583                                 max_hash_buckets_size,
 584                                 (opt_auto_resize ? CDS_LFHT_AUTO_RESIZE : 0) |
 585                                 CDS_LFHT_ACCOUNTING, NULL);
 586         }
 587         if (!test_ht) {
 588                 printf("Error allocating hash table.\n");
 589                 mainret = 1;
 590                 goto end_free_call_rcu_data;
 591         }
 592
 593         /*
 594          * Hash Population needs to be seen as a RCU reader
 595          * thread from the point of view of resize.
 596          */
 597         rcu_register_thread();
 598         ret = (get_populate_hash_cb())();
 599         assert(!ret);
 600
 601         rcu_thread_offline();
 602
 603         next_aff = 0;
 604
 605         ret = pipe(count_pipe);
 606         if (ret == -1) {
 607                 perror("pipe");
 608                 mainret = 1;
 609                 goto end_online;
 610         }
 611
 612         /* spawn counter thread */
 613         err = pthread_create(&tid_count, NULL, thr_count,
 614                              NULL);
 615         if (err != 0) {
 616                 errno = err;
 617                 mainret = 1;
 618                 perror("pthread_create");
 619                 goto end_close_pipe;
 620         }
 621
 622         for (i = 0; i < nr_readers; i++) {
 623                 err = pthread_create(&tid_reader[i],
 624                                      NULL, get_thr_reader_cb(),
 625                                      &count_reader[i]);
 626                 if (err != 0) {
 627                         errno = err;
 628                         mainret = 1;
 629                         perror("pthread_create");
 630                         goto end_pthread_join;
 631                 }
 632                 nr_readers_created++;
 633         }
 634         for (i = 0; i < nr_writers; i++) {
 635                 err = pthread_create(&tid_writer[i],
 636                                      NULL, get_thr_writer_cb(),
 637                                      &count_writer[i]);
 638                 if (err != 0) {
 639                         errno = err;
 640                         mainret = 1;
 641                         perror("pthread_create");
 642                         goto end_pthread_join;
 643                 }
 644                 nr_writers_created++;
 645         }
 646
 647         cmm_smp_mb();
 648
 649         test_go = 1;
 650
 651         remain = duration;
 652         do {
 653                 remain = sleep(remain);
 654         } while (remain > 0);
 655
 656         test_stop = 1;
 657
 658 end_pthread_join:
 659         for (i = 0; i < nr_readers_created; i++) {
 660                 err = pthread_join(tid_reader[i], &tret);
 661                 if (err != 0) {
 662                         errno = err;
 663                         mainret = 1;
 664                         perror("pthread_join");
 665                 }
 666                 tot_reads += count_reader[i];
 667         }
 668         for (i = 0; i < nr_writers_created; i++) {
 669                 err = pthread_join(tid_writer[i], &tret);
 670                 if (err != 0) {
 671                         errno = err;
 672                         mainret = 1;
 673                         perror("pthread_join");
 674                 }
 675                 tot_writes += count_writer[i].update_ops;
 676                 tot_add += count_writer[i].add;
 677                 tot_add_exist += count_writer[i].add_exist;
 678                 tot_remove += count_writer[i].remove;
 679         }
 680
 681         /* teardown counter thread */
 682         act.sa_handler = SIG_IGN;
 683         act.sa_flags = SA_RESTART;
 684         ret = sigaction(SIGUSR2, &act, NULL);
 685         if (ret == -1) {
 686                 mainret = 1;
 687                 perror("sigaction");
 688         }
 689         {
 690                 char msg[1] = { 0x42 };
 691                 ssize_t ret;
 692
 693                 do {
 694                         ret = write(count_pipe[1], msg, 1);     /* wakeup thread */
 695                 } while (ret == -1L && errno == EINTR);
 696         }
 697         err = pthread_join(tid_count, &tret);
 698         if (err != 0) {
 699                 errno = err;
 700                 mainret = 1;
 701                 perror("pthread_join");
 702         }
 703
 704 end_close_pipe:
 705         for (i = 0; i < 2; i++) {
 706                 err = close(count_pipe[i]);
 707                 if (err) {
 708                         mainret = 1;
 709                         perror("close pipe");
 710                 }
 711         }
 712         fflush(stdout);
 713 end_online:
 714         rcu_thread_online();
 715         rcu_read_lock();
 716         printf("Counting nodes... ");
 717         cds_lfht_count_nodes(test_ht, &approx_before, &count, &approx_after);
 718         printf("done.\n");
 719         test_delete_all_nodes(test_ht);
 720         rcu_read_unlock();
 721         rcu_thread_offline();
 722         if (count) {
 723                 printf("Approximation before node accounting: %ld nodes.\n",
 724                         approx_before);
 725                 printf("Nodes deleted from hash table before destroy: "
 726                         "%lu nodes.\n",
 727                         count);
 728                 printf("Approximation after node accounting: %ld nodes.\n",
 729                         approx_after);
 730         }
 731
 732         ret = cds_lfht_destroy(test_ht, NULL);
 733         if (ret) {
 734                 printf_verbose("final delete aborted\n");
 735                 mainret = 1;
 736         } else {
 737                 printf_verbose("final delete success\n");
 738         }
 739         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 740                tot_writes);
 741         nr_leaked = (long long) tot_add + init_populate - tot_remove - count;
 742         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
 743                 "nr_writers %3u "
 744                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
 745                 "nr_add %12llu nr_add_fail %12llu nr_remove %12llu nr_leaked %12lld\n",
 746                 argv[0], duration, nr_readers, rduration,
 747                 nr_writers, wdelay, tot_reads, tot_writes,
 748                 tot_reads + tot_writes, tot_add, tot_add_exist, tot_remove,
 749                 nr_leaked);
 750         if (nr_leaked != 0) {
 751                 mainret = 1;
 752                 printf("WARNING: %lld nodes were leaked!\n", nr_leaked);
 753         }
 754
 755         rcu_unregister_thread();
 756 end_free_call_rcu_data:
 757         free_all_cpu_call_rcu_data();
 758         free(count_writer);
 759 end_free_count_reader:
 760         free(count_reader);
 761 end_free_tid_writer:
 762         free(tid_writer);
 763 end_free_tid_reader:
 764         free(tid_reader);
 765 end:
 766         if (!mainret)
 767                 exit(EXIT_SUCCESS);
 768         else
 769                 exit(EXIT_FAILURE);
 770 }