tests/test_urcu_hash.c

   1 /*
   2  * test_urcu_hash.c
   3  *
   4  * Userspace RCU library - test program
   5  *
   6  * Copyright February 2009 - 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 <stdio.h>
  25 #include <pthread.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #include <sys/wait.h>
  30 #include <unistd.h>
  31 #include <stdio.h>
  32 #include <assert.h>
  33 #include <sched.h>
  34 #include <errno.h>
  35
  36 #ifdef __linux__
  37 #include <syscall.h>
  38 #endif
  39
  40 #define DEFAULT_HASH_SIZE       32
  41 #define DEFAULT_RAND_POOL       1000000
  42
  43 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
  44 #define CACHE_LINE_SIZE 4096
  45
  46 /* hardcoded number of CPUs */
  47 #define NR_CPUS 16384
  48
  49 /* For testing */
  50 #define POISON_FREE
  51
  52 #ifdef POISON_FREE
  53 #define poison_free(ptr)                                \
  54         do {                                            \
  55                 memset(ptr, 0x42, sizeof(*(ptr)));      \
  56                 free(ptr);                              \
  57         } while (0)
  58 #else
  59 #define poison_free(ptr)        free(ptr)
  60 #endif
  61
  62
  63
  64 #if defined(_syscall0)
  65 _syscall0(pid_t, gettid)
  66 #elif defined(__NR_gettid)
  67 static inline pid_t gettid(void)
  68 {
  69         return syscall(__NR_gettid);
  70 }
  71 #else
  72 #warning "use pid as tid"
  73 static inline pid_t gettid(void)
  74 {
  75         return getpid();
  76 }
  77 #endif
  78
  79 #ifndef DYNAMIC_LINK_TEST
  80 #define _LGPL_SOURCE
  81 #else
  82 #define debug_yield_read()
  83 #endif
  84 #include <urcu-qsbr.h>
  85 #include <urcu/rculfhash.h>
  86 #include <urcu-call-rcu.h>
  87
  88 struct wr_count {
  89         unsigned long update_ops;
  90         unsigned long add;
  91         unsigned long add_exist;
  92         unsigned long remove;
  93 };
  94
  95 static unsigned int __thread rand_lookup;
  96 static unsigned long __thread nr_add;
  97 static unsigned long __thread nr_addexist;
  98 static unsigned long __thread nr_del;
  99 static unsigned long __thread nr_delnoent;
 100 static unsigned long __thread lookup_fail;
 101 static unsigned long __thread lookup_ok;
 102
 103 static struct cds_lfht *test_ht;
 104
 105 struct test_data {
 106         int a;
 107         int b;
 108 };
 109
 110 static volatile int test_go, test_stop;
 111
 112 static unsigned long wdelay;
 113
 114 static unsigned long duration;
 115
 116 /* read-side C.S. duration, in loops */
 117 static unsigned long rduration;
 118
 119 static unsigned long init_hash_size = DEFAULT_HASH_SIZE;
 120 static unsigned long init_populate;
 121 static unsigned long rand_pool = DEFAULT_RAND_POOL;
 122 static int opt_auto_resize;
 123 static int add_only, add_unique;
 124
 125 static inline void loop_sleep(unsigned long l)
 126 {
 127         while(l-- != 0)
 128                 caa_cpu_relax();
 129 }
 130
 131 static int verbose_mode;
 132
 133 #define printf_verbose(fmt, args...)            \
 134         do {                                    \
 135                 if (verbose_mode)               \
 136                         printf(fmt, ## args);   \
 137         } while (0)
 138
 139 static unsigned int cpu_affinities[NR_CPUS];
 140 static unsigned int next_aff = 0;
 141 static int use_affinity = 0;
 142
 143 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 144
 145 static void set_affinity(void)
 146 {
 147         cpu_set_t mask;
 148         int cpu;
 149         int ret;
 150
 151         if (!use_affinity)
 152                 return;
 153
 154         ret = pthread_mutex_lock(&affinity_mutex);
 155         if (ret) {
 156                 perror("Error in pthread mutex lock");
 157                 exit(-1);
 158         }
 159         cpu = cpu_affinities[next_aff++];
 160         ret = pthread_mutex_unlock(&affinity_mutex);
 161         if (ret) {
 162                 perror("Error in pthread mutex unlock");
 163                 exit(-1);
 164         }
 165         CPU_ZERO(&mask);
 166         CPU_SET(cpu, &mask);
 167         sched_setaffinity(0, sizeof(mask), &mask);
 168 }
 169
 170 static enum {
 171         AR_RANDOM = 0,
 172         AR_ADD = 1,
 173         AR_REMOVE = -1,
 174 } addremove;    /* 1: add, -1 remove, 0: random */
 175
 176 static
 177 void sigusr1_handler(int signo)
 178 {
 179         switch (addremove) {
 180         case AR_ADD:
 181                 printf("Add/Remove: random.\n");
 182                 addremove = AR_RANDOM;
 183                 break;
 184         case AR_RANDOM:
 185                 printf("Add/Remove: remove only.\n");
 186                 addremove = AR_REMOVE;
 187                 break;
 188         case AR_REMOVE:
 189                 printf("Add/Remove: add only.\n");
 190                 addremove = AR_ADD;
 191                 break;
 192         }
 193 }
 194
 195 /*
 196  * returns 0 if test should end.
 197  */
 198 static int test_duration_write(void)
 199 {
 200         return !test_stop;
 201 }
 202
 203 static int test_duration_read(void)
 204 {
 205         return !test_stop;
 206 }
 207
 208 static unsigned long long __thread nr_writes;
 209 static unsigned long long __thread nr_reads;
 210
 211 static unsigned int nr_readers;
 212 static unsigned int nr_writers;
 213
 214 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 215
 216 void rcu_copy_mutex_lock(void)
 217 {
 218         int ret;
 219         ret = pthread_mutex_lock(&rcu_copy_mutex);
 220         if (ret) {
 221                 perror("Error in pthread mutex lock");
 222                 exit(-1);
 223         }
 224 }
 225
 226 void rcu_copy_mutex_unlock(void)
 227 {
 228         int ret;
 229
 230         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 231         if (ret) {
 232                 perror("Error in pthread mutex unlock");
 233                 exit(-1);
 234         }
 235 }
 236
 237 /*
 238  * Hash function
 239  * Source: http://burtleburtle.net/bob/c/lookup3.c
 240  * Originally Public Domain
 241  */
 242
 243 #define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
 244
 245 #define mix(a, b, c) \
 246 do { \
 247         a -= c; a ^= rot(c,  4); c += b; \
 248         b -= a; b ^= rot(a,  6); a += c; \
 249         c -= b; c ^= rot(b,  8); b += a; \
 250         a -= c; a ^= rot(c, 16); c += b; \
 251         b -= a; b ^= rot(a, 19); a += c; \
 252         c -= b; c ^= rot(b,  4); b += a; \
 253 } while (0)
 254
 255 #define final(a, b, c) \
 256 { \
 257         c ^= b; c -= rot(b, 14); \
 258         a ^= c; a -= rot(c, 11); \
 259         b ^= a; b -= rot(a, 25); \
 260         c ^= b; c -= rot(b, 16); \
 261         a ^= c; a -= rot(c,  4);\
 262         b ^= a; b -= rot(a, 14); \
 263         c ^= b; c -= rot(b, 24); \
 264 }
 265
 266 static __attribute__((unused))
 267 uint32_t hash_u32(
 268         const uint32_t *k,      /* the key, an array of uint32_t values */
 269         size_t length,          /* the length of the key, in uint32_ts */
 270         uint32_t initval)       /* the previous hash, or an arbitrary value */
 271 {
 272         uint32_t a, b, c;
 273
 274         /* Set up the internal state */
 275         a = b = c = 0xdeadbeef + (((uint32_t) length) << 2) + initval;
 276
 277         /*----------------------------------------- handle most of the key */
 278         while (length > 3) {
 279                 a += k[0];
 280                 b += k[1];
 281                 c += k[2];
 282                 mix(a, b, c);
 283                 length -= 3;
 284                 k += 3;
 285         }
 286
 287         /*----------------------------------- handle the last 3 uint32_t's */
 288         switch (length) {       /* all the case statements fall through */
 289         case 3: c += k[2];
 290         case 2: b += k[1];
 291         case 1: a += k[0];
 292                 final(a, b, c);
 293         case 0:                 /* case 0: nothing left to add */
 294                 break;
 295         }
 296         /*---------------------------------------------- report the result */
 297         return c;
 298 }
 299
 300 static
 301 void hashword2(
 302         const uint32_t *k,      /* the key, an array of uint32_t values */
 303         size_t length,          /* the length of the key, in uint32_ts */
 304         uint32_t *pc,           /* IN: seed OUT: primary hash value */
 305         uint32_t *pb)           /* IN: more seed OUT: secondary hash value */
 306 {
 307         uint32_t a, b, c;
 308
 309         /* Set up the internal state */
 310         a = b = c = 0xdeadbeef + ((uint32_t) (length << 2)) + *pc;
 311         c += *pb;
 312
 313         /*----------------------------------------- handle most of the key */
 314         while (length > 3) {
 315                 a += k[0];
 316                 b += k[1];
 317                 c += k[2];
 318                 mix(a, b, c);
 319                 length -= 3;
 320                 k += 3;
 321         }
 322
 323         /*----------------------------------- handle the last 3 uint32_t's */
 324         switch (length) {       /* all the case statements fall through */
 325         case 3: c += k[2];
 326         case 2: b += k[1];
 327         case 1: a += k[0];
 328                 final(a, b, c);
 329         case 0:                 /* case 0: nothing left to add */
 330                 break;
 331         }
 332         /*---------------------------------------------- report the result */
 333         *pc = c;
 334         *pb = b;
 335 }
 336
 337 #if (CAA_BITS_PER_LONG == 32)
 338 static
 339 unsigned long test_hash(void *_key, size_t length, unsigned long seed)
 340 {
 341         unsigned long key = (unsigned long) _key;
 342         unsigned long v;
 343
 344         assert(length == sizeof(unsigned long));
 345         return hash_u32(&v, 1, seed);
 346 }
 347 #else
 348 static
 349 unsigned long test_hash(void *_key, size_t length, unsigned long seed)
 350 {
 351         union {
 352                 uint64_t v64;
 353                 uint32_t v32[2];
 354         } v;
 355         union {
 356                 uint64_t v64;
 357                 uint32_t v32[2];
 358         } key;
 359
 360         assert(length == sizeof(unsigned long));
 361         v.v64 = (uint64_t) seed;
 362         key.v64 = (uint64_t) _key;
 363         hashword2(key.v32, 2, &v.v32[0], &v.v32[1]);
 364         return v.v64;
 365 }
 366 #endif
 367
 368 static
 369 unsigned long test_compare(void *key1, size_t key1_len,
 370                            void *key2, size_t key2_len)
 371 {
 372         if (unlikely(key1_len != key2_len))
 373                 return -1;
 374         assert(key1_len == sizeof(unsigned long));
 375         if (key1 == key2)
 376                 return 0;
 377         else
 378                 return 1;
 379 }
 380
 381 void *thr_reader(void *_count)
 382 {
 383         unsigned long long *count = _count;
 384         struct cds_lfht_node *node;
 385
 386         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 387                         "reader", pthread_self(), (unsigned long)gettid());
 388
 389         set_affinity();
 390
 391         rcu_register_thread();
 392
 393         while (!test_go)
 394         {
 395         }
 396         cmm_smp_mb();
 397
 398         for (;;) {
 399                 rcu_read_lock();
 400                 node = cds_lfht_lookup(test_ht,
 401                         (void *)(unsigned long)(rand_r(&rand_lookup) % rand_pool),
 402                         sizeof(void *));
 403                 if (node == NULL)
 404                         lookup_fail++;
 405                 else
 406                         lookup_ok++;
 407                 debug_yield_read();
 408                 if (unlikely(rduration))
 409                         loop_sleep(rduration);
 410                 rcu_read_unlock();
 411                 nr_reads++;
 412                 if (unlikely(!test_duration_read()))
 413                         break;
 414                 if (unlikely((nr_reads & ((1 << 10) - 1)) == 0))
 415                         rcu_quiescent_state();
 416         }
 417
 418         rcu_unregister_thread();
 419
 420         *count = nr_reads;
 421         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 422                         "reader", pthread_self(), (unsigned long)gettid());
 423         printf_verbose("readid : %lx, lookupfail %lu, lookupok %lu\n",
 424                         pthread_self(), lookup_fail, lookup_ok);
 425         return ((void*)1);
 426
 427 }
 428
 429 static
 430 void free_node_cb(struct rcu_head *head)
 431 {
 432         struct cds_lfht_node *node =
 433                 caa_container_of(head, struct cds_lfht_node, head);
 434         free(node);
 435 }
 436
 437 void *thr_writer(void *_count)
 438 {
 439         struct cds_lfht_node *node, *ret_node;
 440         struct wr_count *count = _count;
 441         int ret;
 442
 443         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 444                         "writer", pthread_self(), (unsigned long)gettid());
 445
 446         set_affinity();
 447
 448         rcu_register_thread();
 449
 450         while (!test_go)
 451         {
 452         }
 453         cmm_smp_mb();
 454
 455         for (;;) {
 456                 if ((addremove == AR_ADD || add_only)
 457                                 || (addremove == AR_RANDOM && rand_r(&rand_lookup) & 1)) {
 458                         node = malloc(sizeof(struct cds_lfht_node));
 459                         rcu_read_lock();
 460                         cds_lfht_node_init(node,
 461                                 (void *)(unsigned long)(rand_r(&rand_lookup) % rand_pool),
 462                                 sizeof(void *));
 463                         if (add_unique)
 464                                 ret_node = cds_lfht_add_unique(test_ht, node);
 465                         else
 466                                 cds_lfht_add(test_ht, node);
 467                         rcu_read_unlock();
 468                         if (add_unique && ret_node != node) {
 469                                 free(node);
 470                                 nr_addexist++;
 471                         } else
 472                                 nr_add++;
 473                 } else {
 474                         /* May delete */
 475                         rcu_read_lock();
 476                         node = cds_lfht_lookup(test_ht,
 477                                 (void *)(unsigned long)(rand_r(&rand_lookup) % rand_pool),
 478                                 sizeof(void *));
 479                         if (node)
 480                                 ret = cds_lfht_remove(test_ht, node);
 481                         else
 482                                 ret = -ENOENT;
 483                         rcu_read_unlock();
 484                         if (ret == 0) {
 485                                 call_rcu(&node->head, free_node_cb);
 486                                 nr_del++;
 487                         } else
 488                                 nr_delnoent++;
 489                 }
 490 #if 0
 491                 //if (nr_writes % 100000 == 0) {
 492                 if (nr_writes % 1000 == 0) {
 493                         rcu_read_lock();
 494                         if (rand_r(&rand_lookup) & 1) {
 495                                 ht_resize(test_ht, 1);
 496                         } else {
 497                                 ht_resize(test_ht, -1);
 498                         }
 499                         rcu_read_unlock();
 500                 }
 501 #endif //0
 502                 nr_writes++;
 503                 if (unlikely(!test_duration_write()))
 504                         break;
 505                 if (unlikely(wdelay))
 506                         loop_sleep(wdelay);
 507                 if (unlikely((nr_writes & ((1 << 10) - 1)) == 0))
 508                         rcu_quiescent_state();
 509         }
 510
 511         rcu_unregister_thread();
 512
 513         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 514                         "writer", pthread_self(), (unsigned long)gettid());
 515         printf_verbose("info id %lx: nr_add %lu, nr_addexist %lu, nr_del %lu, "
 516                         "nr_delnoent %lu\n", pthread_self(), nr_add,
 517                         nr_addexist, nr_del, nr_delnoent);
 518         count->update_ops = nr_writes;
 519         count->add = nr_add;
 520         count->add_exist = nr_addexist;
 521         count->remove = nr_del;
 522         return ((void*)2);
 523 }
 524
 525 static int populate_hash(void)
 526 {
 527         struct cds_lfht_node *node, *ret_node;
 528
 529         if (!init_populate)
 530                 return 0;
 531
 532         if (add_unique && init_populate * 10 > rand_pool) {
 533                 printf("WARNING: required to populate %lu nodes (-k), but random "
 534 "pool is quite small (%lu values) and we are in add_unique (-u) mode. Try with a "
 535 "larger random pool (-p option).\n", init_populate, rand_pool);
 536                 return -1;
 537         }
 538
 539         while (nr_add < init_populate) {
 540                 node = malloc(sizeof(struct cds_lfht_node));
 541                 cds_lfht_node_init(node,
 542                         (void *)(unsigned long)(rand_r(&rand_lookup) % rand_pool),
 543                         sizeof(void *));
 544                 if (add_unique)
 545                         ret_node = cds_lfht_add_unique(test_ht, node);
 546                 else
 547                         cds_lfht_add(test_ht, node);
 548                 if (add_unique && ret_node != node) {
 549                         free(node);
 550                         nr_addexist++;
 551                 } else
 552                         nr_add++;
 553                 nr_writes++;
 554         }
 555         return 0;
 556 }
 557
 558 void show_usage(int argc, char **argv)
 559 {
 560         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 561 #ifdef DEBUG_YIELD
 562         printf(" [-r] [-w] (yield reader and/or writer)");
 563 #endif
 564         printf(" [-d delay] (writer period (us))");
 565         printf(" [-c duration] (reader C.S. duration (in loops))");
 566         printf(" [-v] (verbose output)");
 567         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 568         printf(" [-p size] (random key value pool size)");
 569         printf(" [-h size] (initial hash table size)");
 570         printf(" [-u] Uniquify add.");
 571         printf(" [-i] Add only (no removal).");
 572         printf(" [-k nr_nodes] Number of nodes to insert initially.");
 573         printf(" [-A] Automatically resize hash table.");
 574         printf("\n");
 575 }
 576
 577 int main(int argc, char **argv)
 578 {
 579         int err;
 580         pthread_t *tid_reader, *tid_writer;
 581         void *tret;
 582         unsigned long long *count_reader;
 583         struct wr_count *count_writer;
 584         unsigned long long tot_reads = 0, tot_writes = 0,
 585                 tot_add = 0, tot_add_exist = 0, tot_remove = 0;
 586         unsigned long count, removed;
 587         int i, a, ret;
 588         struct sigaction act;
 589         unsigned int remain;
 590
 591         if (argc < 4) {
 592                 show_usage(argc, argv);
 593                 return -1;
 594         }
 595
 596         err = sscanf(argv[1], "%u", &nr_readers);
 597         if (err != 1) {
 598                 show_usage(argc, argv);
 599                 return -1;
 600         }
 601
 602         err = sscanf(argv[2], "%u", &nr_writers);
 603         if (err != 1) {
 604                 show_usage(argc, argv);
 605                 return -1;
 606         }
 607
 608         err = sscanf(argv[3], "%lu", &duration);
 609         if (err != 1) {
 610                 show_usage(argc, argv);
 611                 return -1;
 612         }
 613
 614         for (i = 4; i < argc; i++) {
 615                 if (argv[i][0] != '-')
 616                         continue;
 617                 switch (argv[i][1]) {
 618 #ifdef DEBUG_YIELD
 619                 case 'r':
 620                         yield_active |= YIELD_READ;
 621                         break;
 622                 case 'w':
 623                         yield_active |= YIELD_WRITE;
 624                         break;
 625 #endif
 626                 case 'a':
 627                         if (argc < i + 2) {
 628                                 show_usage(argc, argv);
 629                                 return -1;
 630                         }
 631                         a = atoi(argv[++i]);
 632                         cpu_affinities[next_aff++] = a;
 633                         use_affinity = 1;
 634                         printf_verbose("Adding CPU %d affinity\n", a);
 635                         break;
 636                 case 'c':
 637                         if (argc < i + 2) {
 638                                 show_usage(argc, argv);
 639                                 return -1;
 640                         }
 641                         rduration = atol(argv[++i]);
 642                         break;
 643                 case 'd':
 644                         if (argc < i + 2) {
 645                                 show_usage(argc, argv);
 646                                 return -1;
 647                         }
 648                         wdelay = atol(argv[++i]);
 649                         break;
 650                 case 'v':
 651                         verbose_mode = 1;
 652                         break;
 653                 case 'p':
 654                         if (argc < i + 2) {
 655                                 show_usage(argc, argv);
 656                                 return -1;
 657                         }
 658                         rand_pool = atol(argv[++i]);
 659                         break;
 660                 case 'h':
 661                         if (argc < i + 2) {
 662                                 show_usage(argc, argv);
 663                                 return -1;
 664                         }
 665                         init_hash_size = atol(argv[++i]);
 666                         break;
 667                 case 'u':
 668                         add_unique = 1;
 669                         break;
 670                 case 'i':
 671                         add_only = 1;
 672                         break;
 673                 case 'k':
 674                         init_populate = atol(argv[++i]);
 675                         break;
 676                 case 'A':
 677                         opt_auto_resize = 1;
 678                         break;
 679                 }
 680         }
 681
 682         /* Check if hash size is power of 2 */
 683         if (init_hash_size && init_hash_size & (init_hash_size - 1)) {
 684                 printf("Error: Hash table size %lu is not a power of 2.\n",
 685                         init_hash_size);
 686                 return -1;
 687         }
 688
 689         memset(&act, 0, sizeof(act));
 690         ret = sigemptyset(&act.sa_mask);
 691         if (ret == -1) {
 692                 perror("sigemptyset");
 693                 return -1;
 694         }
 695         act.sa_handler = sigusr1_handler;
 696         act.sa_flags = SA_RESTART;
 697         ret = sigaction(SIGUSR1, &act, NULL);
 698         if (ret == -1) {
 699                 perror("sigaction");
 700                 return -1;
 701         }
 702
 703         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 704                 duration, nr_readers, nr_writers);
 705         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 706         printf_verbose("Reader duration : %lu loops.\n", rduration);
 707         printf_verbose("Random pool size : %lu.\n", rand_pool);
 708         printf_verbose("Mode:%s%s.\n",
 709                 add_only ? " add only" : " add/remove",
 710                 add_unique ? " uniquify" : "");
 711         printf_verbose("Initial hash table size: %lu buckets.\n", init_hash_size);
 712         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 713                         "main", pthread_self(), (unsigned long)gettid());
 714
 715         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 716         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 717         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 718         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 719         test_ht = cds_lfht_new(test_hash, test_compare, 0x42UL,
 720                         init_hash_size,
 721                         opt_auto_resize ? CDS_LFHT_AUTO_RESIZE : 0,
 722                         call_rcu, synchronize_rcu);
 723         ret = populate_hash();
 724         assert(!ret);
 725         err = create_all_cpu_call_rcu_data(0);
 726         assert(!err);
 727
 728         next_aff = 0;
 729
 730         for (i = 0; i < nr_readers; i++) {
 731                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 732                                      &count_reader[i]);
 733                 if (err != 0)
 734                         exit(1);
 735         }
 736         for (i = 0; i < nr_writers; i++) {
 737                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 738                                      &count_writer[i]);
 739                 if (err != 0)
 740                         exit(1);
 741         }
 742
 743         cmm_smp_mb();
 744
 745         test_go = 1;
 746
 747         remain = duration;
 748         do {
 749                 remain = sleep(remain);
 750         } while (remain > 0);
 751
 752         test_stop = 1;
 753
 754         for (i = 0; i < nr_readers; i++) {
 755                 err = pthread_join(tid_reader[i], &tret);
 756                 if (err != 0)
 757                         exit(1);
 758                 tot_reads += count_reader[i];
 759         }
 760         for (i = 0; i < nr_writers; i++) {
 761                 err = pthread_join(tid_writer[i], &tret);
 762                 if (err != 0)
 763                         exit(1);
 764                 tot_writes += count_writer[i].update_ops;
 765                 tot_add += count_writer[i].add;
 766                 tot_add_exist += count_writer[i].add_exist;
 767                 tot_remove += count_writer[i].remove;
 768         }
 769         printf("Counting nodes... ");
 770         fflush(stdout);
 771         cds_lfht_count_nodes(test_ht, &count, &removed);
 772         printf("done.\n");
 773         if (count || removed)
 774                 printf("WARNING: nodes left in the hash table upon destroy: "
 775                         "%lu nodes + %lu logically removed.\n", count, removed);
 776         ret = cds_lfht_destroy(test_ht);
 777
 778         if (ret)
 779                 printf_verbose("final delete aborted\n");
 780         else
 781                 printf_verbose("final delete success\n");
 782         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 783                tot_writes);
 784         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
 785                 "nr_writers %3u "
 786                 "wdelay %6lu rand_pool %12llu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
 787                 "nr_add %12llu nr_add_fail %12llu nr_remove %12llu nr_leaked %12lld\n",
 788                 argv[0], duration, nr_readers, rduration,
 789                 nr_writers, wdelay, rand_pool, tot_reads, tot_writes,
 790                 tot_reads + tot_writes, tot_add, tot_add_exist, tot_remove,
 791                 (long long) tot_add + init_populate - tot_remove - count);
 792         free(tid_reader);
 793         free(tid_writer);
 794         free(count_reader);
 795         free(count_writer);
 796         return 0;
 797 }