tests/test_urcu_rbtree.c

   1 /*
   2  * test_urcu_rbtree.c
   3  *
   4  * Userspace RCU library - test program for RB tree
   5  *
   6  * Copyright February 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   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 #ifndef DYNAMIC_LINK_TEST
  25 #define _LGPL_SOURCE
  26 #else
  27 #define debug_yield_read()
  28 #endif
  29 #include "../config.h"
  30 #include <stdio.h>
  31 #include <pthread.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <unistd.h>
  37 #include <stdio.h>
  38 #include <assert.h>
  39 #include <sys/syscall.h>
  40 #include <sched.h>
  41 #include <errno.h>
  42 #include <time.h>
  43
  44 #include <urcu/arch.h>
  45
  46 extern int __thread disable_debug;
  47
  48 /* hardcoded number of CPUs */
  49 #define NR_CPUS 16384
  50
  51 /* number of insert/delete */
  52 #define NR_RAND 6
  53 //#define NR_RAND 7
  54
  55 #if defined(_syscall0)
  56 _syscall0(pid_t, gettid)
  57 #elif defined(__NR_gettid)
  58 static inline pid_t gettid(void)
  59 {
  60         return syscall(__NR_gettid);
  61 }
  62 #else
  63 #warning "use pid as tid"
  64 static inline pid_t gettid(void)
  65 {
  66         return getpid();
  67 }
  68 #endif
  69
  70 #include <urcu.h>
  71 #include <urcu/rcurbtree.h>
  72 #include <urcu-defer.h>
  73
  74 /* TODO: error handling testing for -ENOMEM */
  75 struct rcu_rbtree_node *rbtree_alloc(void)
  76 {
  77         return calloc(1, sizeof(struct rcu_rbtree_node));
  78 }
  79
  80 void rbtree_free(struct rcu_head *head)
  81 {
  82         struct rcu_rbtree_node *node =
  83                 caa_container_of(head, struct rcu_rbtree_node, head);
  84         free(node);
  85 }
  86
  87 int tree_comp(void *a, void *b)
  88 {
  89         if ((unsigned long)a < (unsigned long)b)
  90                 return -1;
  91         else if ((unsigned long)a > (unsigned long)b)
  92                 return 1;
  93         else
  94                 return 0;
  95 }
  96
  97 static DEFINE_RCU_RBTREE(rbtree, tree_comp, rbtree_alloc, rbtree_free);
  98
  99 static volatile int test_go, test_stop;
 100
 101 static unsigned long wdelay;
 102
 103 static unsigned long duration;
 104
 105 /* read-side C.S. duration, in loops */
 106 static unsigned long rduration;
 107
 108 /* write-side C.S. duration, in loops */
 109 static unsigned long wduration;
 110
 111 static inline void loop_sleep(unsigned long l)
 112 {
 113         while(l-- != 0)
 114                 caa_cpu_relax();
 115 }
 116
 117 static int verbose_mode;
 118
 119 #define printf_verbose(fmt, args...)            \
 120         do {                                    \
 121                 if (verbose_mode)               \
 122                         printf(fmt, args);      \
 123         } while (0)
 124
 125 static unsigned int cpu_affinities[NR_CPUS];
 126 static unsigned int next_aff = 0;
 127 static int use_affinity = 0;
 128
 129 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 130
 131 #ifndef HAVE_CPU_SET_T
 132 typedef unsigned long cpu_set_t;
 133 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
 134 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
 135 #endif
 136
 137 static void set_affinity(void)
 138 {
 139         cpu_set_t mask;
 140         int cpu;
 141         int ret;
 142
 143         if (!use_affinity)
 144                 return;
 145
 146 #if HAVE_SCHED_SETAFFINITY
 147         ret = pthread_mutex_lock(&affinity_mutex);
 148         if (ret) {
 149                 perror("Error in pthread mutex lock");
 150                 exit(-1);
 151         }
 152         cpu = cpu_affinities[next_aff++];
 153         ret = pthread_mutex_unlock(&affinity_mutex);
 154         if (ret) {
 155                 perror("Error in pthread mutex unlock");
 156                 exit(-1);
 157         }
 158
 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 /*
 170  * returns 0 if test should end.
 171  */
 172 static int test_duration_write(void)
 173 {
 174         return !test_stop;
 175 }
 176
 177 static int test_duration_read(void)
 178 {
 179         return !test_stop;
 180 }
 181
 182 static unsigned long long __thread nr_writes;
 183 static unsigned long long __thread nr_reads;
 184
 185 static unsigned int nr_readers;
 186 static unsigned int nr_writers;
 187
 188 static unsigned long global_items;
 189 static void **global_key = NULL;
 190
 191 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 192
 193 void rcu_copy_mutex_lock(void)
 194 {
 195         int ret;
 196         ret = pthread_mutex_lock(&rcu_copy_mutex);
 197         if (ret) {
 198                 perror("Error in pthread mutex lock");
 199                 exit(-1);
 200         }
 201 }
 202
 203 void rcu_copy_mutex_unlock(void)
 204 {
 205         int ret;
 206
 207         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 208         if (ret) {
 209                 perror("Error in pthread mutex unlock");
 210                 exit(-1);
 211         }
 212 }
 213
 214 static
 215 void set_lookup_index(struct rcu_rbtree_node *node,
 216                 char *lookup_hit)
 217 {
 218         int i;
 219
 220         for (i = 0; i < global_items; i++) {
 221                 if (node->begin == global_key[i]
 222                     && !lookup_hit[i]) {
 223                         lookup_hit[i] = 1;
 224                         break;
 225                 }
 226         }
 227 }
 228
 229 void *thr_reader(void *_count)
 230 {
 231         unsigned long long *count = _count;
 232         struct rcu_rbtree_node *node;
 233         int i, index;
 234         char *lookup_hit;
 235
 236         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 237                         "reader", pthread_self(), (unsigned long)gettid());
 238
 239         set_affinity();
 240
 241         rcu_register_thread();
 242
 243         lookup_hit = malloc(sizeof(*lookup_hit) * global_items);
 244
 245         while (!test_go)
 246         {
 247         }
 248         cmm_smp_mb();
 249
 250         for (;;) {
 251                 /* search */
 252                 for (i = 0; i < global_items; i++) {
 253                         rcu_read_lock();
 254                         node = rcu_rbtree_search(&rbtree,
 255                                                  rcu_dereference(rbtree.root),
 256                                                  global_key[i]);
 257                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 258                         rcu_read_unlock();
 259                 }
 260 #if 0
 261                 /* search range */
 262                 for (i = 0; i < global_items; i++) {
 263                         rcu_read_lock();
 264                         node = rcu_rbtree_search_range(&rbtree,
 265                                                  rcu_dereference(rbtree.root),
 266                                                  global_key[i],
 267                                                  (void*) ((unsigned long) global_key[i] + 1));
 268                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 269                         rcu_read_unlock();
 270                 }
 271 #endif //0
 272                 /* min + next */
 273                 memset(lookup_hit, 0, sizeof(*lookup_hit) * global_items);
 274
 275                 rcu_read_lock();
 276                 node = rcu_rbtree_min(&rbtree,
 277                                       rcu_dereference(rbtree.root));
 278                 while (!rcu_rbtree_is_nil(&rbtree, node)) {
 279                         set_lookup_index(node, lookup_hit);
 280                         node = rcu_rbtree_next(&rbtree, node);
 281                 }
 282                 rcu_read_unlock();
 283
 284                 for (i = 0; i < global_items; i++)
 285                         assert(lookup_hit[i]);
 286
 287                 /* max + prev */
 288                 memset(lookup_hit, 0, sizeof(*lookup_hit) * global_items);
 289
 290                 rcu_read_lock();
 291                 node = rcu_rbtree_max(&rbtree,
 292                                       rcu_dereference(rbtree.root));
 293                 while (!rcu_rbtree_is_nil(&rbtree, node)) {
 294                         set_lookup_index(node, lookup_hit);
 295                         node = rcu_rbtree_prev(&rbtree, node);
 296                 }
 297                 rcu_read_unlock();
 298
 299                 for (i = 0; i < global_items; i++)
 300                         assert(lookup_hit[i]);
 301
 302                 debug_yield_read();
 303                 if (unlikely(rduration))
 304                         loop_sleep(rduration);
 305                 nr_reads++;
 306                 if (unlikely(!test_duration_read()))
 307                         break;
 308         }
 309
 310         rcu_unregister_thread();
 311
 312         /* test extra thread registration */
 313         rcu_register_thread();
 314         rcu_unregister_thread();
 315
 316         free(lookup_hit);
 317
 318         *count = nr_reads;
 319         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 320                         "reader", pthread_self(), (unsigned long)gettid());
 321         return ((void*)1);
 322
 323 }
 324
 325 void *thr_writer(void *_count)
 326 {
 327         unsigned long long *count = _count;
 328         struct rcu_rbtree_node *node;
 329         void *key[NR_RAND];
 330         int i;
 331
 332         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 333                         "writer", pthread_self(), (unsigned long)gettid());
 334
 335         set_affinity();
 336
 337         //disable_debug = 1;
 338
 339         rcu_register_thread();
 340
 341         while (!test_go)
 342         {
 343         }
 344         cmm_smp_mb();
 345
 346         for (;;) {
 347                 rcu_copy_mutex_lock();
 348
 349                 for (i = 0; i < NR_RAND; i++) {
 350                         node = rbtree_alloc();
 351                         //key[i] = (void *)(unsigned long)(rand() % 2048);
 352                         key[i] = (void *)(unsigned long)(rand() % 6);
 353                         node->begin = key[i];
 354                         node->end = (void *)((unsigned long) key[i] + 1);
 355                         rcu_read_lock();
 356                         rcu_rbtree_insert(&rbtree, node);
 357                         rcu_read_unlock();
 358                 }
 359                 rcu_copy_mutex_unlock();
 360
 361                 if (unlikely(wduration))
 362                         loop_sleep(wduration);
 363
 364                 rcu_copy_mutex_lock();
 365                 for (i = 0; i < NR_RAND; i++) {
 366 #if 0
 367                         node = rcu_rbtree_min(rbtree, rbtree->root);
 368                         while (!rcu_rbtree_is_nil(&rbtree, node)) {
 369                                 printf("{ 0x%lX p:%lX r:%lX l:%lX %s %s %s} ",
 370                                         (unsigned long)node->key,
 371                                         node->p->key,
 372                                         node->right->key,
 373                                         node->left->key,
 374                                         node->color ? "red" : "black",
 375                                         node->pos ? "right" : "left",
 376                                         node->nil ? "nil" : "");
 377                                 node = rcu_rbtree_next(rbtree, node);
 378                         }
 379                         printf("\n");
 380 #endif
 381                         rcu_read_lock();
 382                         node = rcu_rbtree_search(&rbtree, rbtree.root, key[i]);
 383                         assert(!rcu_rbtree_is_nil(&rbtree, node));
 384                         rcu_rbtree_remove(&rbtree, node);
 385                         rcu_read_unlock();
 386                         call_rcu(&node->head, rbtree_free);
 387                 }
 388
 389                 rcu_copy_mutex_unlock();
 390                 nr_writes++;
 391                 if (unlikely(!test_duration_write()))
 392                         break;
 393                 if (unlikely(wdelay))
 394                         loop_sleep(wdelay);
 395         }
 396
 397         rcu_unregister_thread();
 398
 399         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 400                         "writer", pthread_self(), (unsigned long)gettid());
 401         *count = nr_writes;
 402         return ((void*)2);
 403 }
 404
 405 void show_usage(int argc, char **argv)
 406 {
 407         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 408 #ifdef DEBUG_YIELD
 409         printf(" [-r] [-w] (yield reader and/or writer)");
 410 #endif
 411         printf(" [-d delay] (writer period (us))");
 412         printf(" [-c duration] (reader C.S. duration (in loops))");
 413         printf(" [-e duration] (writer C.S. duration (in loops))");
 414         printf(" [-v] (verbose output)");
 415         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 416         printf("\n");
 417 }
 418
 419 int main(int argc, char **argv)
 420 {
 421         int err;
 422         pthread_t *tid_reader, *tid_writer;
 423         void *tret;
 424         unsigned long long *count_reader, *count_writer;
 425         unsigned long long tot_reads = 0, tot_writes = 0;
 426         int i, a;
 427         struct rcu_rbtree_node *node;
 428
 429         if (argc < 4) {
 430                 show_usage(argc, argv);
 431                 return -1;
 432         }
 433
 434         err = sscanf(argv[1], "%u", &nr_readers);
 435         if (err != 1) {
 436                 show_usage(argc, argv);
 437                 return -1;
 438         }
 439
 440         err = sscanf(argv[2], "%u", &nr_writers);
 441         if (err != 1) {
 442                 show_usage(argc, argv);
 443                 return -1;
 444         }
 445
 446         err = sscanf(argv[3], "%lu", &duration);
 447         if (err != 1) {
 448                 show_usage(argc, argv);
 449                 return -1;
 450         }
 451
 452         for (i = 4; i < argc; i++) {
 453                 if (argv[i][0] != '-')
 454                         continue;
 455                 switch (argv[i][1]) {
 456 #ifdef DEBUG_YIELD
 457                 case 'r':
 458                         yield_active |= YIELD_READ;
 459                         break;
 460                 case 'w':
 461                         yield_active |= YIELD_WRITE;
 462                         break;
 463 #endif
 464                 case 'a':
 465                         if (argc < i + 2) {
 466                                 show_usage(argc, argv);
 467                                 return -1;
 468                         }
 469                         a = atoi(argv[++i]);
 470                         cpu_affinities[next_aff++] = a;
 471                         use_affinity = 1;
 472                         printf_verbose("Adding CPU %d affinity\n", a);
 473                         break;
 474                 case 'c':
 475                         if (argc < i + 2) {
 476                                 show_usage(argc, argv);
 477                                 return -1;
 478                         }
 479                         rduration = atol(argv[++i]);
 480                         break;
 481                 case 'd':
 482                         if (argc < i + 2) {
 483                                 show_usage(argc, argv);
 484                                 return -1;
 485                         }
 486                         wdelay = atol(argv[++i]);
 487                         break;
 488                 case 'e':
 489                         if (argc < i + 2) {
 490                                 show_usage(argc, argv);
 491                                 return -1;
 492                         }
 493                         wduration = atol(argv[++i]);
 494                         break;
 495                 case 'v':
 496                         verbose_mode = 1;
 497                         break;
 498                 case 'g':
 499                         if (argc < i + 2) {
 500                                 show_usage(argc, argv);
 501                                 return -1;
 502                         }
 503                         global_items = atol(argv[++i]);
 504                         break;
 505                 }
 506         }
 507
 508         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 509                 duration, nr_readers, nr_writers);
 510         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 511         printf_verbose("Reader duration : %lu loops.\n", rduration);
 512         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 513                         "main", pthread_self(), (unsigned long)gettid());
 514
 515         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 516         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 517         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 518         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 519         global_key = malloc(sizeof(*global_key) * global_items);
 520
 521         srand(time(NULL));
 522
 523         next_aff = 0;
 524
 525         for (i = 0; i < nr_readers; i++) {
 526                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 527                                      &count_reader[i]);
 528                 if (err != 0)
 529                         exit(1);
 530         }
 531         for (i = 0; i < nr_writers; i++) {
 532                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 533                                      &count_writer[i]);
 534                 if (err != 0)
 535                         exit(1);
 536         }
 537
 538         rcu_register_thread();
 539         rcu_read_lock();
 540         /* Insert items looked up by readers */
 541         for (i = 0; i < global_items; i++) {
 542                 node = rbtree_alloc();
 543                 global_key[i] = (void *)(unsigned long)(rand() % 6);
 544                 node->begin = global_key[i];
 545                 node->end = (void *)((unsigned long) global_key[i] + 1);
 546                 rcu_rbtree_insert(&rbtree, node);
 547         }
 548         rcu_read_unlock();
 549
 550         cmm_smp_mb();
 551
 552         test_go = 1;
 553
 554         sleep(duration);
 555
 556         test_stop = 1;
 557
 558         for (i = 0; i < nr_readers; i++) {
 559                 err = pthread_join(tid_reader[i], &tret);
 560                 if (err != 0)
 561                         exit(1);
 562                 tot_reads += count_reader[i];
 563         }
 564         for (i = 0; i < nr_writers; i++) {
 565                 err = pthread_join(tid_writer[i], &tret);
 566                 if (err != 0)
 567                         exit(1);
 568                 tot_writes += count_writer[i];
 569         }
 570
 571         rcu_read_lock();
 572         for (i = 0; i < global_items; i++) {
 573                 node = rcu_rbtree_search(&rbtree, rbtree.root, global_key[i]);
 574                 assert(!rcu_rbtree_is_nil(&rbtree, node));
 575                 rcu_rbtree_remove(&rbtree, node);
 576                 call_rcu(&node->head, rbtree_free);
 577         }
 578         rcu_read_unlock();
 579         rcu_unregister_thread();
 580
 581         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 582                tot_writes);
 583         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 584                 "nr_writers %3u "
 585                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu "
 586                 "global_items %6lu\n",
 587                 argv[0], duration, nr_readers, rduration, wduration,
 588                 nr_writers, wdelay, tot_reads, tot_writes,
 589                 tot_reads + tot_writes, global_items);
 590         free(tid_reader);
 591         free(tid_writer);
 592         free(count_reader);
 593         free(count_writer);
 594         free(global_key);
 595         return 0;
 596 }