tests/benchmark/test_rwlock.c

   1 /*
   2  * test_urcu.c
   3  *
   4  * Userspace RCU library - test program
   5  *
   6  * Copyright February 2009 - 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 #include <stdio.h>
  24 #include <pthread.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <sys/types.h>
  28 #include <sys/wait.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <assert.h>
  32 #include <errno.h>
  33
  34 #include <urcu/arch.h>
  35 #include <urcu/tls-compat.h>
  36 #include "cpuset.h"
  37 #include "thread-id.h"
  38
  39 /* hardcoded number of CPUs */
  40 #define NR_CPUS 16384
  41
  42 #ifndef DYNAMIC_LINK_TEST
  43 #define _LGPL_SOURCE
  44 #endif
  45 #include <urcu.h>
  46
  47 struct test_array {
  48         int a;
  49 };
  50
  51 pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
  52
  53 static volatile int test_go, test_stop;
  54
  55 static unsigned long wdelay;
  56
  57 static volatile struct test_array test_array = { 8 };
  58
  59 static unsigned long duration;
  60
  61 /* read-side C.S. duration, in loops */
  62 static unsigned long rduration;
  63
  64 /* write-side C.S. duration, in loops */
  65 static unsigned long wduration;
  66
  67 static inline void loop_sleep(unsigned long loops)
  68 {
  69         while (loops-- != 0)
  70                 caa_cpu_relax();
  71 }
  72
  73 static int verbose_mode;
  74
  75 #define printf_verbose(fmt, args...)            \
  76         do {                                    \
  77                 if (verbose_mode)               \
  78                         printf(fmt, args);      \
  79         } while (0)
  80
  81 static unsigned int cpu_affinities[NR_CPUS];
  82 static unsigned int next_aff = 0;
  83 static int use_affinity = 0;
  84
  85 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
  86
  87 static void set_affinity(void)
  88 {
  89 #if HAVE_SCHED_SETAFFINITY
  90         cpu_set_t mask;
  91         int cpu, ret;
  92 #endif /* HAVE_SCHED_SETAFFINITY */
  93
  94         if (!use_affinity)
  95                 return;
  96
  97 #if HAVE_SCHED_SETAFFINITY
  98         ret = pthread_mutex_lock(&affinity_mutex);
  99         if (ret) {
 100                 perror("Error in pthread mutex lock");
 101                 exit(-1);
 102         }
 103         cpu = cpu_affinities[next_aff++];
 104         ret = pthread_mutex_unlock(&affinity_mutex);
 105         if (ret) {
 106                 perror("Error in pthread mutex unlock");
 107                 exit(-1);
 108         }
 109
 110         CPU_ZERO(&mask);
 111         CPU_SET(cpu, &mask);
 112 #if SCHED_SETAFFINITY_ARGS == 2
 113         sched_setaffinity(0, &mask);
 114 #else
 115         sched_setaffinity(0, sizeof(mask), &mask);
 116 #endif
 117 #endif /* HAVE_SCHED_SETAFFINITY */
 118 }
 119
 120 /*
 121  * returns 0 if test should end.
 122  */
 123 static int test_duration_write(void)
 124 {
 125         return !test_stop;
 126 }
 127
 128 static int test_duration_read(void)
 129 {
 130         return !test_stop;
 131 }
 132
 133 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
 134 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
 135
 136 static unsigned int nr_readers;
 137 static unsigned int nr_writers;
 138
 139 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 140
 141 void rcu_copy_mutex_lock(void)
 142 {
 143         int ret;
 144         ret = pthread_mutex_lock(&rcu_copy_mutex);
 145         if (ret) {
 146                 perror("Error in pthread mutex lock");
 147                 exit(-1);
 148         }
 149 }
 150
 151 void rcu_copy_mutex_unlock(void)
 152 {
 153         int ret;
 154
 155         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 156         if (ret) {
 157                 perror("Error in pthread mutex unlock");
 158                 exit(-1);
 159         }
 160 }
 161
 162 void *thr_reader(void *_count)
 163 {
 164         unsigned long long *count = _count;
 165
 166         printf_verbose("thread_begin %s, tid %lu\n",
 167                         "reader", urcu_get_thread_id());
 168
 169         set_affinity();
 170
 171         while (!test_go)
 172         {
 173         }
 174
 175         for (;;) {
 176                 int a;
 177
 178                 pthread_rwlock_rdlock(&lock);
 179                 a = test_array.a;
 180                 assert(a == 8);
 181                 if (caa_unlikely(rduration))
 182                         loop_sleep(rduration);
 183                 pthread_rwlock_unlock(&lock);
 184                 URCU_TLS(nr_reads)++;
 185                 if (caa_unlikely(!test_duration_read()))
 186                         break;
 187         }
 188
 189         *count = URCU_TLS(nr_reads);
 190         printf_verbose("thread_end %s, tid %lu\n",
 191                         "reader", urcu_get_thread_id());
 192         return ((void*)1);
 193
 194 }
 195
 196 void *thr_writer(void *_count)
 197 {
 198         unsigned long long *count = _count;
 199
 200         printf_verbose("thread_begin %s, tid %lu\n",
 201                         "writer", urcu_get_thread_id());
 202
 203         set_affinity();
 204
 205         while (!test_go)
 206         {
 207         }
 208         cmm_smp_mb();
 209
 210         for (;;) {
 211                 pthread_rwlock_wrlock(&lock);
 212                 test_array.a = 0;
 213                 test_array.a = 8;
 214                 if (caa_unlikely(wduration))
 215                         loop_sleep(wduration);
 216                 pthread_rwlock_unlock(&lock);
 217                 URCU_TLS(nr_writes)++;
 218                 if (caa_unlikely(!test_duration_write()))
 219                         break;
 220                 if (caa_unlikely(wdelay))
 221                         loop_sleep(wdelay);
 222         }
 223
 224         printf_verbose("thread_end %s, tid %lu\n",
 225                         "writer", urcu_get_thread_id());
 226         *count = URCU_TLS(nr_writes);
 227         return ((void*)2);
 228 }
 229
 230 void show_usage(int argc, char **argv)
 231 {
 232         printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
 233                 argv[0]);
 234         printf("OPTIONS:\n");
 235         printf("        [-d delay] (writer period (us))\n");
 236         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 237         printf("        [-e duration] (writer C.S. duration (in loops))\n");
 238         printf("        [-v] (verbose output)\n");
 239         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 240         printf("\n");
 241 }
 242
 243 int main(int argc, char **argv)
 244 {
 245         int err;
 246         pthread_t *tid_reader, *tid_writer;
 247         void *tret;
 248         unsigned long long *count_reader, *count_writer;
 249         unsigned long long tot_reads = 0, tot_writes = 0;
 250         int i, a;
 251
 252         if (argc < 4) {
 253                 show_usage(argc, argv);
 254                 return -1;
 255         }
 256         cmm_smp_mb();
 257
 258         err = sscanf(argv[1], "%u", &nr_readers);
 259         if (err != 1) {
 260                 show_usage(argc, argv);
 261                 return -1;
 262         }
 263
 264         err = sscanf(argv[2], "%u", &nr_writers);
 265         if (err != 1) {
 266                 show_usage(argc, argv);
 267                 return -1;
 268         }
 269
 270         err = sscanf(argv[3], "%lu", &duration);
 271         if (err != 1) {
 272                 show_usage(argc, argv);
 273                 return -1;
 274         }
 275
 276         for (i = 4; i < argc; i++) {
 277                 if (argv[i][0] != '-')
 278                         continue;
 279                 switch (argv[i][1]) {
 280                 case 'a':
 281                         if (argc < i + 2) {
 282                                 show_usage(argc, argv);
 283                                 return -1;
 284                         }
 285                         a = atoi(argv[++i]);
 286                         cpu_affinities[next_aff++] = a;
 287                         use_affinity = 1;
 288                         printf_verbose("Adding CPU %d affinity\n", a);
 289                         break;
 290                 case 'c':
 291                         if (argc < i + 2) {
 292                                 show_usage(argc, argv);
 293                                 return -1;
 294                         }
 295                         rduration = atol(argv[++i]);
 296                         break;
 297                 case 'd':
 298                         if (argc < i + 2) {
 299                                 show_usage(argc, argv);
 300                                 return -1;
 301                         }
 302                         wdelay = atol(argv[++i]);
 303                         break;
 304                 case 'e':
 305                         if (argc < i + 2) {
 306                                 show_usage(argc, argv);
 307                                 return -1;
 308                         }
 309                         wduration = atol(argv[++i]);
 310                         break;
 311                 case 'v':
 312                         verbose_mode = 1;
 313                         break;
 314                 }
 315         }
 316
 317         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 318                 duration, nr_readers, nr_writers);
 319         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 320         printf_verbose("Reader duration : %lu loops.\n", rduration);
 321         printf_verbose("thread %-6s, tid %lu\n",
 322                         "main", urcu_get_thread_id());
 323
 324         tid_reader = calloc(nr_readers, sizeof(*tid_reader));
 325         tid_writer = calloc(nr_writers, sizeof(*tid_writer));
 326         count_reader = calloc(nr_readers, sizeof(*count_reader));
 327         count_writer = calloc(nr_writers, sizeof(*count_writer));
 328
 329         next_aff = 0;
 330
 331         for (i = 0; i < nr_readers; i++) {
 332                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 333                                      &count_reader[i]);
 334                 if (err != 0)
 335                         exit(1);
 336         }
 337         for (i = 0; i < nr_writers; i++) {
 338                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 339                                      &count_writer[i]);
 340                 if (err != 0)
 341                         exit(1);
 342         }
 343
 344         cmm_smp_mb();
 345
 346         test_go = 1;
 347
 348         sleep(duration);
 349
 350         test_stop = 1;
 351
 352         for (i = 0; i < nr_readers; i++) {
 353                 err = pthread_join(tid_reader[i], &tret);
 354                 if (err != 0)
 355                         exit(1);
 356                 tot_reads += count_reader[i];
 357         }
 358         for (i = 0; i < nr_writers; i++) {
 359                 err = pthread_join(tid_writer[i], &tret);
 360                 if (err != 0)
 361                         exit(1);
 362                 tot_writes += count_writer[i];
 363         }
 364
 365         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 366                tot_writes);
 367         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 368                 "nr_writers %3u "
 369                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 370                 argv[0], duration, nr_readers, rduration, wduration,
 371                 nr_writers, wdelay, tot_reads, tot_writes,
 372                 tot_reads + tot_writes);
 373
 374         free(tid_reader);
 375         free(tid_writer);
 376         free(count_reader);
 377         free(count_writer);
 378         return 0;
 379 }