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_MIN_ALLOC_SIZE  1
  42 #define DEFAULT_RAND_POOL       1000000
  43
  44 #define TEST_HASH_SEED  0x42UL
  45
  46 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
  47 #define CACHE_LINE_SIZE 4096
  48
  49 /* hardcoded number of CPUs */
  50 #define NR_CPUS 16384
  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 struct lfht_test_node {
 111         struct cds_lfht_node node;
 112         void *key;
 113         unsigned int key_len;
 114         /* cache-cold for iteration */
 115         struct rcu_head head;
 116 };
 117
 118 static inline struct lfht_test_node *
 119 to_test_node(struct cds_lfht_node *node)
 120 {
 121         return caa_container_of(node, struct lfht_test_node, node);
 122 }
 123
 124 static inline
 125 void lfht_test_node_init(struct lfht_test_node *node, void *key,
 126                         size_t key_len)
 127 {
 128         cds_lfht_node_init(&node->node);
 129         node->key = key;
 130         node->key_len = key_len;
 131 }
 132
 133 static inline struct lfht_test_node *
 134 cds_lfht_iter_get_test_node(struct cds_lfht_iter *iter)
 135 {
 136         return to_test_node(cds_lfht_iter_get_node(iter));
 137 }
 138
 139 static volatile int test_go, test_stop;
 140
 141 static unsigned long wdelay;
 142
 143 static unsigned long duration;
 144
 145 /* read-side C.S. duration, in loops */
 146 static unsigned long rduration;
 147
 148 static unsigned long init_hash_size = DEFAULT_HASH_SIZE;
 149 static unsigned long min_hash_alloc_size = DEFAULT_MIN_ALLOC_SIZE;
 150 static unsigned long init_populate;
 151 static int opt_auto_resize;
 152 static int add_only, add_unique, add_replace;
 153
 154 static unsigned long init_pool_offset, lookup_pool_offset, write_pool_offset;
 155 static unsigned long init_pool_size = DEFAULT_RAND_POOL,
 156         lookup_pool_size = DEFAULT_RAND_POOL,
 157         write_pool_size = DEFAULT_RAND_POOL;
 158 static int validate_lookup;
 159
 160 static int count_pipe[2];
 161
 162 static inline void loop_sleep(unsigned long l)
 163 {
 164         while(l-- != 0)
 165                 caa_cpu_relax();
 166 }
 167
 168 static int verbose_mode;
 169
 170 #define printf_verbose(fmt, args...)            \
 171         do {                                    \
 172                 if (verbose_mode)               \
 173                         printf(fmt, ## args);   \
 174         } while (0)
 175
 176 static unsigned int cpu_affinities[NR_CPUS];
 177 static unsigned int next_aff = 0;
 178 static int use_affinity = 0;
 179
 180 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 181
 182 static void set_affinity(void)
 183 {
 184         cpu_set_t mask;
 185         int cpu;
 186         int ret;
 187
 188         if (!use_affinity)
 189                 return;
 190
 191         ret = pthread_mutex_lock(&affinity_mutex);
 192         if (ret) {
 193                 perror("Error in pthread mutex lock");
 194                 exit(-1);
 195         }
 196         cpu = cpu_affinities[next_aff++];
 197         ret = pthread_mutex_unlock(&affinity_mutex);
 198         if (ret) {
 199                 perror("Error in pthread mutex unlock");
 200                 exit(-1);
 201         }
 202         CPU_ZERO(&mask);
 203         CPU_SET(cpu, &mask);
 204         sched_setaffinity(0, sizeof(mask), &mask);
 205 }
 206
 207 static enum {
 208         AR_RANDOM = 0,
 209         AR_ADD = 1,
 210         AR_REMOVE = -1,
 211 } addremove;    /* 1: add, -1 remove, 0: random */
 212
 213 static
 214 void sigusr1_handler(int signo)
 215 {
 216         switch (addremove) {
 217         case AR_ADD:
 218                 printf("Add/Remove: random.\n");
 219                 addremove = AR_RANDOM;
 220                 break;
 221         case AR_RANDOM:
 222                 printf("Add/Remove: remove only.\n");
 223                 addremove = AR_REMOVE;
 224                 break;
 225         case AR_REMOVE:
 226                 printf("Add/Remove: add only.\n");
 227                 addremove = AR_ADD;
 228                 break;
 229         }
 230 }
 231
 232 static
 233 void sigusr2_handler(int signo)
 234 {
 235         char msg[1] = { 0x42 };
 236         ssize_t ret;
 237
 238         do {
 239                 ret = write(count_pipe[1], msg, 1);     /* wakeup thread */
 240         } while (ret == -1L && errno == EINTR);
 241 }
 242
 243 /*
 244  * returns 0 if test should end.
 245  */
 246 static int test_duration_write(void)
 247 {
 248         return !test_stop;
 249 }
 250
 251 static int test_duration_read(void)
 252 {
 253         return !test_stop;
 254 }
 255
 256 static unsigned long long __thread nr_writes;
 257 static unsigned long long __thread nr_reads;
 258
 259 static unsigned int nr_readers;
 260 static unsigned int nr_writers;
 261
 262 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 263
 264 void rcu_copy_mutex_lock(void)
 265 {
 266         int ret;
 267         ret = pthread_mutex_lock(&rcu_copy_mutex);
 268         if (ret) {
 269                 perror("Error in pthread mutex lock");
 270                 exit(-1);
 271         }
 272 }
 273
 274 void rcu_copy_mutex_unlock(void)
 275 {
 276         int ret;
 277
 278         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 279         if (ret) {
 280                 perror("Error in pthread mutex unlock");
 281                 exit(-1);
 282         }
 283 }
 284
 285 /*
 286  * Hash function
 287  * Source: http://burtleburtle.net/bob/c/lookup3.c
 288  * Originally Public Domain
 289  */
 290
 291 #define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
 292
 293 #define mix(a, b, c) \
 294 do { \
 295         a -= c; a ^= rot(c,  4); c += b; \
 296         b -= a; b ^= rot(a,  6); a += c; \
 297         c -= b; c ^= rot(b,  8); b += a; \
 298         a -= c; a ^= rot(c, 16); c += b; \
 299         b -= a; b ^= rot(a, 19); a += c; \
 300         c -= b; c ^= rot(b,  4); b += a; \
 301 } while (0)
 302
 303 #define final(a, b, c) \
 304 { \
 305         c ^= b; c -= rot(b, 14); \
 306         a ^= c; a -= rot(c, 11); \
 307         b ^= a; b -= rot(a, 25); \
 308         c ^= b; c -= rot(b, 16); \
 309         a ^= c; a -= rot(c,  4);\
 310         b ^= a; b -= rot(a, 14); \
 311         c ^= b; c -= rot(b, 24); \
 312 }
 313
 314 static __attribute__((unused))
 315 uint32_t hash_u32(
 316         const uint32_t *k,      /* the key, an array of uint32_t values */
 317         size_t length,          /* the length of the key, in uint32_ts */
 318         uint32_t initval)       /* the previous hash, or an arbitrary value */
 319 {
 320         uint32_t a, b, c;
 321
 322         /* Set up the internal state */
 323         a = b = c = 0xdeadbeef + (((uint32_t) length) << 2) + initval;
 324
 325         /*----------------------------------------- handle most of the key */
 326         while (length > 3) {
 327                 a += k[0];
 328                 b += k[1];
 329                 c += k[2];
 330                 mix(a, b, c);
 331                 length -= 3;
 332                 k += 3;
 333         }
 334
 335         /*----------------------------------- handle the last 3 uint32_t's */
 336         switch (length) {       /* all the case statements fall through */
 337         case 3: c += k[2];
 338         case 2: b += k[1];
 339         case 1: a += k[0];
 340                 final(a, b, c);
 341         case 0:                 /* case 0: nothing left to add */
 342                 break;
 343         }
 344         /*---------------------------------------------- report the result */
 345         return c;
 346 }
 347
 348 static
 349 void hashword2(
 350         const uint32_t *k,      /* the key, an array of uint32_t values */
 351         size_t length,          /* the length of the key, in uint32_ts */
 352         uint32_t *pc,           /* IN: seed OUT: primary hash value */
 353         uint32_t *pb)           /* IN: more seed OUT: secondary hash value */
 354 {
 355         uint32_t a, b, c;
 356
 357         /* Set up the internal state */
 358         a = b = c = 0xdeadbeef + ((uint32_t) (length << 2)) + *pc;
 359         c += *pb;
 360
 361         /*----------------------------------------- handle most of the key */
 362         while (length > 3) {
 363                 a += k[0];
 364                 b += k[1];
 365                 c += k[2];
 366                 mix(a, b, c);
 367                 length -= 3;
 368                 k += 3;
 369         }
 370
 371         /*----------------------------------- handle the last 3 uint32_t's */
 372         switch (length) {       /* all the case statements fall through */
 373         case 3: c += k[2];
 374         case 2: b += k[1];
 375         case 1: a += k[0];
 376                 final(a, b, c);
 377         case 0:                 /* case 0: nothing left to add */
 378                 break;
 379         }
 380         /*---------------------------------------------- report the result */
 381         *pc = c;
 382         *pb = b;
 383 }
 384
 385 #if (CAA_BITS_PER_LONG == 32)
 386 static
 387 unsigned long test_hash(void *_key, size_t length, unsigned long seed)
 388 {
 389         unsigned int key = (unsigned int) _key;
 390
 391         assert(length == sizeof(unsigned int));
 392         return hash_u32(&key, 1, seed);
 393 }
 394 #else
 395 static
 396 unsigned long test_hash(void *_key, size_t length, unsigned long seed)
 397 {
 398         union {
 399                 uint64_t v64;
 400                 uint32_t v32[2];
 401         } v;
 402         union {
 403                 uint64_t v64;
 404                 uint32_t v32[2];
 405         } key;
 406
 407         assert(length == sizeof(unsigned long));
 408         v.v64 = (uint64_t) seed;
 409         key.v64 = (uint64_t) _key;
 410         hashword2(key.v32, 2, &v.v32[0], &v.v32[1]);
 411         return v.v64;
 412 }
 413 #endif
 414
 415 static
 416 unsigned long test_compare(void *key1, size_t key1_len,
 417                            void *key2, size_t key2_len)
 418 {
 419         if (caa_unlikely(key1_len != key2_len))
 420                 return -1;
 421         assert(key1_len == sizeof(unsigned long));
 422         if (key1 == key2)
 423                 return 0;
 424         else
 425                 return 1;
 426 }
 427
 428 static
 429 int test_match(struct cds_lfht_node *node, void *key)
 430 {
 431         struct lfht_test_node *test_node = to_test_node(node);
 432
 433         return !test_compare(test_node->key, test_node->key_len,
 434                         key, sizeof(unsigned long));
 435 }
 436
 437 static
 438 void cds_lfht_test_lookup(struct cds_lfht *ht, void *key, size_t key_len,
 439                 struct cds_lfht_iter *iter)
 440 {
 441         assert(key_len == sizeof(unsigned long));
 442
 443         cds_lfht_lookup(ht, test_match,
 444                         test_hash(key, key_len, TEST_HASH_SEED),
 445                         key, iter);
 446 }
 447
 448 void *thr_count(void *arg)
 449 {
 450         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 451                         "counter", pthread_self(), (unsigned long)gettid());
 452
 453         rcu_register_thread();
 454
 455         for (;;) {
 456                 unsigned long count, removed;
 457                 long approx_before, approx_after;
 458                 ssize_t len;
 459                 char buf[1];
 460
 461                 rcu_thread_offline();
 462                 len = read(count_pipe[0], buf, 1);
 463                 rcu_thread_online();
 464                 if (caa_unlikely(!test_duration_read()))
 465                         break;
 466                 if (len != 1)
 467                         continue;
 468                 /* Accounting */
 469                 printf("Counting nodes... ");
 470                 fflush(stdout);
 471                 rcu_read_lock();
 472                 cds_lfht_count_nodes(test_ht, &approx_before, &count, &removed,
 473                                 &approx_after);
 474                 rcu_read_unlock();
 475                 printf("done.\n");
 476                 printf("Approximation before node accounting: %ld nodes.\n",
 477                         approx_before);
 478                 printf("Accounting of nodes in the hash table: "
 479                         "%lu nodes + %lu logically removed.\n",
 480                         count, removed);
 481                 printf("Approximation after node accounting: %ld nodes.\n",
 482                         approx_after);
 483         }
 484         rcu_unregister_thread();
 485         return NULL;
 486 }
 487
 488 void *thr_reader(void *_count)
 489 {
 490         unsigned long long *count = _count;
 491         struct lfht_test_node *node;
 492         struct cds_lfht_iter iter;
 493
 494         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 495                         "reader", pthread_self(), (unsigned long)gettid());
 496
 497         set_affinity();
 498
 499         rcu_register_thread();
 500
 501         while (!test_go)
 502         {
 503         }
 504         cmm_smp_mb();
 505
 506         for (;;) {
 507                 rcu_read_lock();
 508                 cds_lfht_test_lookup(test_ht,
 509                         (void *)(((unsigned long) rand_r(&rand_lookup) % lookup_pool_size) + lookup_pool_offset),
 510                         sizeof(void *), &iter);
 511                 node = cds_lfht_iter_get_test_node(&iter);
 512                 if (node == NULL) {
 513                         if (validate_lookup) {
 514                                 printf("[ERROR] Lookup cannot find initial node.\n");
 515                                 exit(-1);
 516                         }
 517                         lookup_fail++;
 518                 } else {
 519                         lookup_ok++;
 520                 }
 521                 debug_yield_read();
 522                 if (caa_unlikely(rduration))
 523                         loop_sleep(rduration);
 524                 rcu_read_unlock();
 525                 nr_reads++;
 526                 if (caa_unlikely(!test_duration_read()))
 527                         break;
 528                 if (caa_unlikely((nr_reads & ((1 << 10) - 1)) == 0))
 529                         rcu_quiescent_state();
 530         }
 531
 532         rcu_unregister_thread();
 533
 534         *count = nr_reads;
 535         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 536                         "reader", pthread_self(), (unsigned long)gettid());
 537         printf_verbose("readid : %lx, lookupfail %lu, lookupok %lu\n",
 538                         pthread_self(), lookup_fail, lookup_ok);
 539         return ((void*)1);
 540
 541 }
 542
 543 static
 544 void free_node_cb(struct rcu_head *head)
 545 {
 546         struct lfht_test_node *node =
 547                 caa_container_of(head, struct lfht_test_node, head);
 548         free(node);
 549 }
 550
 551 void *thr_writer(void *_count)
 552 {
 553         struct lfht_test_node *node;
 554         struct cds_lfht_node *ret_node;
 555         struct cds_lfht_iter iter;
 556         struct wr_count *count = _count;
 557         int ret;
 558
 559         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 560                         "writer", pthread_self(), (unsigned long)gettid());
 561
 562         set_affinity();
 563
 564         rcu_register_thread();
 565
 566         while (!test_go)
 567         {
 568         }
 569         cmm_smp_mb();
 570
 571         for (;;) {
 572                 if ((addremove == AR_ADD || add_only)
 573                                 || (addremove == AR_RANDOM && rand_r(&rand_lookup) & 1)) {
 574                         node = malloc(sizeof(struct lfht_test_node));
 575                         lfht_test_node_init(node,
 576                                 (void *)(((unsigned long) rand_r(&rand_lookup) % write_pool_size) + write_pool_offset),
 577                                 sizeof(void *));
 578                         rcu_read_lock();
 579                         if (add_unique) {
 580                                 ret_node = cds_lfht_add_unique(test_ht, test_match, node->key,
 581                                         test_hash(node->key, node->key_len, TEST_HASH_SEED),
 582                                         &node->node);
 583                         } else {
 584                                 if (add_replace)
 585                                         ret_node = cds_lfht_add_replace(test_ht, test_match, node->key,
 586                                                         test_hash(node->key, node->key_len, TEST_HASH_SEED),
 587                                                         &node->node);
 588                                 else
 589                                         cds_lfht_add(test_ht,
 590                                                 test_hash(node->key, node->key_len, TEST_HASH_SEED),
 591                                                 &node->node);
 592                         }
 593                         rcu_read_unlock();
 594                         if (add_unique && ret_node != &node->node) {
 595                                 free(node);
 596                                 nr_addexist++;
 597                         } else {
 598                                 if (add_replace && ret_node) {
 599                                         call_rcu(&to_test_node(ret_node)->head,
 600                                                         free_node_cb);
 601                                         nr_addexist++;
 602                                 } else {
 603                                         nr_add++;
 604                                 }
 605                         }
 606                 } else {
 607                         /* May delete */
 608                         rcu_read_lock();
 609                         cds_lfht_test_lookup(test_ht,
 610                                 (void *)(((unsigned long) rand_r(&rand_lookup) % write_pool_size) + write_pool_offset),
 611                                 sizeof(void *), &iter);
 612                         ret = cds_lfht_del(test_ht, &iter);
 613                         rcu_read_unlock();
 614                         if (ret == 0) {
 615                                 node = cds_lfht_iter_get_test_node(&iter);
 616                                 call_rcu(&node->head, free_node_cb);
 617                                 nr_del++;
 618                         } else
 619                                 nr_delnoent++;
 620                 }
 621 #if 0
 622                 //if (nr_writes % 100000 == 0) {
 623                 if (nr_writes % 1000 == 0) {
 624                         rcu_read_lock();
 625                         if (rand_r(&rand_lookup) & 1) {
 626                                 ht_resize(test_ht, 1);
 627                         } else {
 628                                 ht_resize(test_ht, -1);
 629                         }
 630                         rcu_read_unlock();
 631                 }
 632 #endif //0
 633                 nr_writes++;
 634                 if (caa_unlikely(!test_duration_write()))
 635                         break;
 636                 if (caa_unlikely(wdelay))
 637                         loop_sleep(wdelay);
 638                 if (caa_unlikely((nr_writes & ((1 << 10) - 1)) == 0))
 639                         rcu_quiescent_state();
 640         }
 641
 642         rcu_unregister_thread();
 643
 644         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 645                         "writer", pthread_self(), (unsigned long)gettid());
 646         printf_verbose("info id %lx: nr_add %lu, nr_addexist %lu, nr_del %lu, "
 647                         "nr_delnoent %lu\n", pthread_self(), nr_add,
 648                         nr_addexist, nr_del, nr_delnoent);
 649         count->update_ops = nr_writes;
 650         count->add = nr_add;
 651         count->add_exist = nr_addexist;
 652         count->remove = nr_del;
 653         return ((void*)2);
 654 }
 655
 656 static int populate_hash(void)
 657 {
 658         struct lfht_test_node *node;
 659         struct cds_lfht_node *ret_node;
 660
 661         if (!init_populate)
 662                 return 0;
 663
 664         if ((add_unique || add_replace) && init_populate * 10 > init_pool_size) {
 665                 printf("WARNING: required to populate %lu nodes (-k), but random "
 666 "pool is quite small (%lu values) and we are in add_unique (-u) or add_replace (-s) mode. Try with a "
 667 "larger random pool (-p option). This may take a while...\n", init_populate, init_pool_size);
 668         }
 669
 670         while (nr_add < init_populate) {
 671                 node = malloc(sizeof(struct lfht_test_node));
 672                 lfht_test_node_init(node,
 673                         (void *)(((unsigned long) rand_r(&rand_lookup) % init_pool_size) + init_pool_offset),
 674                         sizeof(void *));
 675                 rcu_read_lock();
 676                 if (add_unique) {
 677                         ret_node = cds_lfht_add_unique(test_ht, test_match, node->key,
 678                                 test_hash(node->key, node->key_len, TEST_HASH_SEED),
 679                                 &node->node);
 680                 } else {
 681                         if (add_replace)
 682                                 ret_node = cds_lfht_add_replace(test_ht, test_match, node->key,
 683                                                 test_hash(node->key, node->key_len, TEST_HASH_SEED),
 684                                                 &node->node);
 685                         else
 686                                 cds_lfht_add(test_ht,
 687                                         test_hash(node->key, node->key_len, TEST_HASH_SEED),
 688                                         &node->node);
 689                 }
 690                 rcu_read_unlock();
 691                 if (add_unique && ret_node != &node->node) {
 692                         free(node);
 693                         nr_addexist++;
 694                 } else {
 695                         if (add_replace && ret_node) {
 696                                 call_rcu(&to_test_node(ret_node)->head, free_node_cb);
 697                                 nr_addexist++;
 698                         } else {
 699                                 nr_add++;
 700                         }
 701                 }
 702                 nr_writes++;
 703         }
 704         return 0;
 705 }
 706
 707 static
 708 void test_delete_all_nodes(struct cds_lfht *ht)
 709 {
 710         struct cds_lfht_iter iter;
 711         struct lfht_test_node *node;
 712         unsigned long count = 0;
 713
 714         cds_lfht_first(ht, &iter);
 715         while ((node = cds_lfht_iter_get_test_node(&iter)) != NULL) {
 716                 int ret;
 717
 718                 ret = cds_lfht_del(test_ht, &iter);
 719                 assert(!ret);
 720                 call_rcu(&node->head, free_node_cb);
 721                 cds_lfht_next(ht, &iter);
 722                 count++;
 723         }
 724         printf("deleted %lu nodes.\n", count);
 725 }
 726
 727 void show_usage(int argc, char **argv)
 728 {
 729         printf("Usage : %s nr_readers nr_writers duration (s)\n", argv[0]);
 730 #ifdef DEBUG_YIELD
 731         printf("        [-r] [-w] (yield reader and/or writer)\n");
 732 #endif
 733         printf("        [-d delay] (writer period (us))\n");
 734         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 735         printf("        [-v] (verbose output)\n");
 736         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 737         printf("        [-h size] (initial hash table size)\n");
 738         printf("        [-m size] (minimum hash alloc size)\n");
 739         printf("        [not -u nor -s] Add entries (supports redundant keys).\n");
 740         printf("        [-u] Uniquify add (no redundant keys).\n");
 741         printf("        [-s] Replace (swap) entries.\n");
 742         printf("        [-i] Add only (no removal).\n");
 743         printf("        [-k nr_nodes] Number of nodes to insert initially.\n");
 744         printf("        [-A] Automatically resize hash table.\n");
 745         printf("        [-R offset] Lookup pool offset.\n");
 746         printf("        [-S offset] Write pool offset.\n");
 747         printf("        [-T offset] Init pool offset.\n");
 748         printf("        [-M size] Lookup pool size.\n");
 749         printf("        [-N size] Write pool size.\n");
 750         printf("        [-O size] Init pool size.\n");
 751         printf("        [-V] Validate lookups of init values (use with filled init pool, same lookup range, with different write range).\n");
 752         printf("\n\n");
 753 }
 754
 755 int main(int argc, char **argv)
 756 {
 757         int err;
 758         pthread_t *tid_reader, *tid_writer;
 759         pthread_t tid_count;
 760         void *tret;
 761         unsigned long long *count_reader;
 762         struct wr_count *count_writer;
 763         unsigned long long tot_reads = 0, tot_writes = 0,
 764                 tot_add = 0, tot_add_exist = 0, tot_remove = 0;
 765         unsigned long count, removed;
 766         long approx_before, approx_after;
 767         int i, a, ret;
 768         struct sigaction act;
 769         unsigned int remain;
 770
 771         if (argc < 4) {
 772                 show_usage(argc, argv);
 773                 return -1;
 774         }
 775
 776         err = sscanf(argv[1], "%u", &nr_readers);
 777         if (err != 1) {
 778                 show_usage(argc, argv);
 779                 return -1;
 780         }
 781
 782         err = sscanf(argv[2], "%u", &nr_writers);
 783         if (err != 1) {
 784                 show_usage(argc, argv);
 785                 return -1;
 786         }
 787
 788         err = sscanf(argv[3], "%lu", &duration);
 789         if (err != 1) {
 790                 show_usage(argc, argv);
 791                 return -1;
 792         }
 793
 794         for (i = 4; i < argc; i++) {
 795                 if (argv[i][0] != '-')
 796                         continue;
 797                 switch (argv[i][1]) {
 798 #ifdef DEBUG_YIELD
 799                 case 'r':
 800                         yield_active |= YIELD_READ;
 801                         break;
 802                 case 'w':
 803                         yield_active |= YIELD_WRITE;
 804                         break;
 805 #endif
 806                 case 'a':
 807                         if (argc < i + 2) {
 808                                 show_usage(argc, argv);
 809                                 return -1;
 810                         }
 811                         a = atoi(argv[++i]);
 812                         cpu_affinities[next_aff++] = a;
 813                         use_affinity = 1;
 814                         printf_verbose("Adding CPU %d affinity\n", a);
 815                         break;
 816                 case 'c':
 817                         if (argc < i + 2) {
 818                                 show_usage(argc, argv);
 819                                 return -1;
 820                         }
 821                         rduration = atol(argv[++i]);
 822                         break;
 823                 case 'd':
 824                         if (argc < i + 2) {
 825                                 show_usage(argc, argv);
 826                                 return -1;
 827                         }
 828                         wdelay = atol(argv[++i]);
 829                         break;
 830                 case 'v':
 831                         verbose_mode = 1;
 832                         break;
 833                 case 'h':
 834                         if (argc < i + 2) {
 835                                 show_usage(argc, argv);
 836                                 return -1;
 837                         }
 838                         init_hash_size = atol(argv[++i]);
 839                         break;
 840                 case 'm':
 841                         if (argc < i + 2) {
 842                                 show_usage(argc, argv);
 843                                 return -1;
 844                         }
 845                         min_hash_alloc_size = atol(argv[++i]);
 846                         break;
 847                 case 'u':
 848                         if (add_replace) {
 849                                 printf("Please specify at most one of -s or -u.\n");
 850                                 exit(-1);
 851                         }
 852                         add_unique = 1;
 853                         break;
 854                 case 's':
 855                         if (add_unique) {
 856                                 printf("Please specify at most one of -s or -u.\n");
 857                                 exit(-1);
 858                         }
 859                         add_replace = 1;
 860                         break;
 861                 case 'i':
 862                         add_only = 1;
 863                         break;
 864                 case 'k':
 865                         init_populate = atol(argv[++i]);
 866                         break;
 867                 case 'A':
 868                         opt_auto_resize = 1;
 869                         break;
 870                 case 'R':
 871                         lookup_pool_offset = atol(argv[++i]);
 872                         break;
 873                 case 'S':
 874                         write_pool_offset = atol(argv[++i]);
 875                         break;
 876                 case 'T':
 877                         init_pool_offset = atol(argv[++i]);
 878                         break;
 879                 case 'M':
 880                         lookup_pool_size = atol(argv[++i]);
 881                         break;
 882                 case 'N':
 883                         write_pool_size = atol(argv[++i]);
 884                         break;
 885                 case 'O':
 886                         init_pool_size = atol(argv[++i]);
 887                         break;
 888                 case 'V':
 889                         validate_lookup = 1;
 890                         break;
 891
 892                 }
 893         }
 894
 895         /* Check if hash size is power of 2 */
 896         if (init_hash_size && init_hash_size & (init_hash_size - 1)) {
 897                 printf("Error: Hash table size %lu is not a power of 2.\n",
 898                         init_hash_size);
 899                 return -1;
 900         }
 901
 902         if (min_hash_alloc_size && min_hash_alloc_size * (min_hash_alloc_size - 1)) {
 903                 printf("Error: Min hash alloc size %lu is not a power of 2.\n",
 904                         min_hash_alloc_size);
 905                 return -1;
 906         }
 907
 908         memset(&act, 0, sizeof(act));
 909         ret = sigemptyset(&act.sa_mask);
 910         if (ret == -1) {
 911                 perror("sigemptyset");
 912                 return -1;
 913         }
 914         act.sa_handler = sigusr1_handler;
 915         act.sa_flags = SA_RESTART;
 916         ret = sigaction(SIGUSR1, &act, NULL);
 917         if (ret == -1) {
 918                 perror("sigaction");
 919                 return -1;
 920         }
 921
 922         ret = pipe(count_pipe);
 923         if (ret == -1) {
 924                 perror("pipe");
 925                 return -1;
 926         }
 927
 928         /* spawn counter thread */
 929         err = pthread_create(&tid_count, NULL, thr_count,
 930                              NULL);
 931         if (err != 0)
 932                 exit(1);
 933
 934         act.sa_handler = sigusr2_handler;
 935         act.sa_flags = SA_RESTART;
 936         ret = sigaction(SIGUSR2, &act, NULL);
 937         if (ret == -1) {
 938                 perror("sigaction");
 939                 return -1;
 940         }
 941
 942         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 943                 duration, nr_readers, nr_writers);
 944         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 945         printf_verbose("Reader duration : %lu loops.\n", rduration);
 946         printf_verbose("Mode:%s%s.\n",
 947                 add_only ? " add only" : " add/remove",
 948                 add_unique ? " uniquify" : ( add_replace ? " replace" : " insert"));
 949         printf_verbose("Initial hash table size: %lu buckets.\n", init_hash_size);
 950         printf_verbose("Minimum hash alloc size: %lu buckets.\n", min_hash_alloc_size);
 951         printf_verbose("Init pool size offset %lu size %lu.\n",
 952                 init_pool_offset, init_pool_size);
 953         printf_verbose("Lookup pool size offset %lu size %lu.\n",
 954                 lookup_pool_offset, lookup_pool_size);
 955         printf_verbose("Update pool size offset %lu size %lu.\n",
 956                 write_pool_offset, write_pool_size);
 957         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 958                         "main", pthread_self(), (unsigned long)gettid());
 959
 960         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 961         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 962         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 963         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 964
 965         err = create_all_cpu_call_rcu_data(0);
 966         assert(!err);
 967
 968         /*
 969          * Hash creation and population needs to be seen as a RCU reader
 970          * thread from the point of view of resize.
 971          */
 972         rcu_register_thread();
 973         test_ht = cds_lfht_new(init_hash_size, min_hash_alloc_size,
 974                         (opt_auto_resize ? CDS_LFHT_AUTO_RESIZE : 0) |
 975                         CDS_LFHT_ACCOUNTING, NULL);
 976         ret = populate_hash();
 977         assert(!ret);
 978
 979         rcu_thread_offline();
 980
 981         next_aff = 0;
 982
 983         for (i = 0; i < nr_readers; i++) {
 984                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 985                                      &count_reader[i]);
 986                 if (err != 0)
 987                         exit(1);
 988         }
 989         for (i = 0; i < nr_writers; i++) {
 990                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 991                                      &count_writer[i]);
 992                 if (err != 0)
 993                         exit(1);
 994         }
 995
 996         cmm_smp_mb();
 997
 998         test_go = 1;
 999
1000         remain = duration;
1001         do {
1002                 remain = sleep(remain);
1003         } while (remain > 0);
1004
1005         test_stop = 1;
1006
1007         for (i = 0; i < nr_readers; i++) {
1008                 err = pthread_join(tid_reader[i], &tret);
1009                 if (err != 0)
1010                         exit(1);
1011                 tot_reads += count_reader[i];
1012         }
1013         for (i = 0; i < nr_writers; i++) {
1014                 err = pthread_join(tid_writer[i], &tret);
1015                 if (err != 0)
1016                         exit(1);
1017                 tot_writes += count_writer[i].update_ops;
1018                 tot_add += count_writer[i].add;
1019                 tot_add_exist += count_writer[i].add_exist;
1020                 tot_remove += count_writer[i].remove;
1021         }
1022
1023         /* teardown counter thread */
1024         act.sa_handler = SIG_IGN;
1025         act.sa_flags = SA_RESTART;
1026         ret = sigaction(SIGUSR2, &act, NULL);
1027         if (ret == -1) {
1028                 perror("sigaction");
1029                 return -1;
1030         }
1031         {
1032                 char msg[1] = { 0x42 };
1033                 ssize_t ret;
1034
1035                 do {
1036                         ret = write(count_pipe[1], msg, 1);     /* wakeup thread */
1037                 } while (ret == -1L && errno == EINTR);
1038         }
1039         err = pthread_join(tid_count, &tret);
1040         if (err != 0)
1041                 exit(1);
1042
1043         fflush(stdout);
1044         rcu_thread_online();
1045         rcu_read_lock();
1046         printf("Counting nodes... ");
1047         cds_lfht_count_nodes(test_ht, &approx_before, &count, &removed,
1048                 &approx_after);
1049         printf("done.\n");
1050         test_delete_all_nodes(test_ht);
1051         rcu_read_unlock();
1052         rcu_thread_offline();
1053         if (count || removed) {
1054                 printf("Approximation before node accounting: %ld nodes.\n",
1055                         approx_before);
1056                 printf("Nodes deleted from hash table before destroy: "
1057                         "%lu nodes + %lu logically removed.\n",
1058                         count, removed);
1059                 printf("Approximation after node accounting: %ld nodes.\n",
1060                         approx_after);
1061         }
1062         ret = cds_lfht_destroy(test_ht, NULL);
1063         if (ret)
1064                 printf_verbose("final delete aborted\n");
1065         else
1066                 printf_verbose("final delete success\n");
1067         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
1068                tot_writes);
1069         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
1070                 "nr_writers %3u "
1071                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
1072                 "nr_add %12llu nr_add_fail %12llu nr_remove %12llu nr_leaked %12lld\n",
1073                 argv[0], duration, nr_readers, rduration,
1074                 nr_writers, wdelay, tot_reads, tot_writes,
1075                 tot_reads + tot_writes, tot_add, tot_add_exist, tot_remove,
1076                 (long long) tot_add + init_populate - tot_remove - count);
1077         rcu_unregister_thread();
1078         free_all_cpu_call_rcu_data();
1079         free(tid_reader);
1080         free(tid_writer);
1081         free(count_reader);
1082         free(count_writer);
1083         return 0;
1084 }