tests/benchmark/test_mutex.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 #define _GNU_SOURCE
  24 #include "config.h"
  25 #include <stdio.h>
  26 #include <pthread.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/types.h>
  30 #include <sys/wait.h>
  31 #include <unistd.h>
  32 #include <stdio.h>
  33 #include <assert.h>
  34 #include <errno.h>
  35
  36 #include <urcu/arch.h>
  37 #include <urcu/tls-compat.h>
  38 #include "cpuset.h"
  39 #include "thread-id.h"
  40
  41 /* hardcoded number of CPUs */
  42 #define NR_CPUS 16384
  43
  44 #ifndef DYNAMIC_LINK_TEST
  45 #define _LGPL_SOURCE
  46 #else
  47 #define debug_yield_read()
  48 #endif
  49 #include <urcu.h>
  50
  51 struct test_array {
  52         int a;
  53 };
  54
  55 static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
  56
  57 static volatile int test_go, test_stop;
  58
  59 static unsigned long wdelay;
  60
  61 static volatile struct test_array test_array = { 8 };
  62
  63 static unsigned long duration;
  64
  65 /* read-side C.S. duration, in loops */
  66 static unsigned long rduration;
  67
  68 /* write-side C.S. duration, in loops */
  69 static unsigned long wduration;
  70
  71 static inline void loop_sleep(unsigned long loops)
  72 {
  73         while (loops-- != 0)
  74                 caa_cpu_relax();
  75 }
  76
  77 static int verbose_mode;
  78
  79 #define printf_verbose(fmt, args...)            \
  80         do {                                    \
  81                 if (verbose_mode)               \
  82                         printf(fmt, args);      \
  83         } while (0)
  84
  85 static unsigned int cpu_affinities[NR_CPUS];
  86 static unsigned int next_aff = 0;
  87 static int use_affinity = 0;
  88
  89 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
  90
  91 static void set_affinity(void)
  92 {
  93 #if HAVE_SCHED_SETAFFINITY
  94         cpu_set_t mask;
  95         int cpu, ret;
  96 #endif /* HAVE_SCHED_SETAFFINITY */
  97
  98         if (!use_affinity)
  99                 return;
 100
 101 #if HAVE_SCHED_SETAFFINITY
 102         ret = pthread_mutex_lock(&affinity_mutex);
 103         if (ret) {
 104                 perror("Error in pthread mutex lock");
 105                 exit(-1);
 106         }
 107         cpu = cpu_affinities[next_aff++];
 108         ret = pthread_mutex_unlock(&affinity_mutex);
 109         if (ret) {
 110                 perror("Error in pthread mutex unlock");
 111                 exit(-1);
 112         }
 113         CPU_ZERO(&mask);
 114         CPU_SET(cpu, &mask);
 115 #if SCHED_SETAFFINITY_ARGS == 2
 116         sched_setaffinity(0, &mask);
 117 #else
 118         sched_setaffinity(0, sizeof(mask), &mask);
 119 #endif
 120 #endif /* HAVE_SCHED_SETAFFINITY */
 121 }
 122
 123 /*
 124  * returns 0 if test should end.
 125  */
 126 static int test_duration_write(void)
 127 {
 128         return !test_stop;
 129 }
 130
 131 static int test_duration_read(void)
 132 {
 133         return !test_stop;
 134 }
 135
 136 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
 137 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
 138
 139 static
 140 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_writes;
 141 static
 142 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_reads;
 143
 144 static unsigned int nr_readers;
 145 static unsigned int nr_writers;
 146
 147 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 148
 149 void rcu_copy_mutex_lock(void)
 150 {
 151         int ret;
 152         ret = pthread_mutex_lock(&rcu_copy_mutex);
 153         if (ret) {
 154                 perror("Error in pthread mutex lock");
 155                 exit(-1);
 156         }
 157 }
 158
 159 void rcu_copy_mutex_unlock(void)
 160 {
 161         int ret;
 162
 163         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 164         if (ret) {
 165                 perror("Error in pthread mutex unlock");
 166                 exit(-1);
 167         }
 168 }
 169
 170 void *thr_reader(void *data)
 171 {
 172         unsigned long tidx = (unsigned long)data;
 173
 174         printf_verbose("thread_begin %s, tid %lu\n",
 175                         "reader", urcu_get_thread_id());
 176
 177         set_affinity();
 178
 179         while (!test_go)
 180         {
 181         }
 182
 183         for (;;) {
 184                 pthread_mutex_lock(&lock);
 185                 assert(test_array.a == 8);
 186                 if (caa_unlikely(rduration))
 187                         loop_sleep(rduration);
 188                 pthread_mutex_unlock(&lock);
 189                 URCU_TLS(nr_reads)++;
 190                 if (caa_unlikely(!test_duration_read()))
 191                         break;
 192         }
 193
 194         tot_nr_reads[tidx] = URCU_TLS(nr_reads);
 195         printf_verbose("thread_end %s, tid %lu\n",
 196                         "reader", urcu_get_thread_id());
 197         return ((void*)1);
 198
 199 }
 200
 201 void *thr_writer(void *data)
 202 {
 203         unsigned long wtidx = (unsigned long)data;
 204
 205         printf_verbose("thread_begin %s, tid %lu\n",
 206                         "writer", urcu_get_thread_id());
 207
 208         set_affinity();
 209
 210         while (!test_go)
 211         {
 212         }
 213         cmm_smp_mb();
 214
 215         for (;;) {
 216                 pthread_mutex_lock(&lock);
 217                 test_array.a = 0;
 218                 test_array.a = 8;
 219                 if (caa_unlikely(wduration))
 220                         loop_sleep(wduration);
 221                 pthread_mutex_unlock(&lock);
 222                 URCU_TLS(nr_writes)++;
 223                 if (caa_unlikely(!test_duration_write()))
 224                         break;
 225                 if (caa_unlikely(wdelay))
 226                         loop_sleep(wdelay);
 227         }
 228
 229         printf_verbose("thread_end %s, tid %lu\n",
 230                         "writer", urcu_get_thread_id());
 231         tot_nr_writes[wtidx] = URCU_TLS(nr_writes);
 232         return ((void*)2);
 233 }
 234
 235 void show_usage(int argc, char **argv)
 236 {
 237         printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
 238                 argv[0]);
 239         printf("OPTIONS:\n");
 240 #ifdef DEBUG_YIELD
 241         printf("        [-r] [-w] (yield reader and/or writer)\n");
 242 #endif
 243         printf("        [-d delay] (writer period (us))\n");
 244         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 245         printf("        [-e duration] (writer C.S. duration (in loops))\n");
 246         printf("        [-v] (verbose output)\n");
 247         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 248         printf("\n");
 249 }
 250
 251 int main(int argc, char **argv)
 252 {
 253         int err;
 254         pthread_t *tid_reader, *tid_writer;
 255         void *tret;
 256         unsigned long long *count_reader, *count_writer;
 257         unsigned long long tot_reads = 0, tot_writes = 0;
 258         int i, a;
 259
 260         if (argc < 4) {
 261                 show_usage(argc, argv);
 262                 return -1;
 263         }
 264         cmm_smp_mb();
 265
 266         err = sscanf(argv[1], "%u", &nr_readers);
 267         if (err != 1) {
 268                 show_usage(argc, argv);
 269                 return -1;
 270         }
 271
 272         err = sscanf(argv[2], "%u", &nr_writers);
 273         if (err != 1) {
 274                 show_usage(argc, argv);
 275                 return -1;
 276         }
 277
 278         err = sscanf(argv[3], "%lu", &duration);
 279         if (err != 1) {
 280                 show_usage(argc, argv);
 281                 return -1;
 282         }
 283
 284         for (i = 4; i < argc; i++) {
 285                 if (argv[i][0] != '-')
 286                         continue;
 287                 switch (argv[i][1]) {
 288 #ifdef DEBUG_YIELD
 289                 case 'r':
 290                         yield_active |= YIELD_READ;
 291                         break;
 292                 case 'w':
 293                         yield_active |= YIELD_WRITE;
 294                         break;
 295 #endif
 296                 case 'a':
 297                         if (argc < i + 2) {
 298                                 show_usage(argc, argv);
 299                                 return -1;
 300                         }
 301                         a = atoi(argv[++i]);
 302                         cpu_affinities[next_aff++] = a;
 303                         use_affinity = 1;
 304                         printf_verbose("Adding CPU %d affinity\n", a);
 305                         break;
 306                 case 'c':
 307                         if (argc < i + 2) {
 308                                 show_usage(argc, argv);
 309                                 return -1;
 310                         }
 311                         rduration = atol(argv[++i]);
 312                         break;
 313                 case 'd':
 314                         if (argc < i + 2) {
 315                                 show_usage(argc, argv);
 316                                 return -1;
 317                         }
 318                         wdelay = atol(argv[++i]);
 319                         break;
 320                 case 'e':
 321                         if (argc < i + 2) {
 322                                 show_usage(argc, argv);
 323                                 return -1;
 324                         }
 325                         wduration = atol(argv[++i]);
 326                         break;
 327                 case 'v':
 328                         verbose_mode = 1;
 329                         break;
 330                 }
 331         }
 332
 333         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 334                 duration, nr_readers, nr_writers);
 335         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 336         printf_verbose("Reader duration : %lu loops.\n", rduration);
 337         printf_verbose("thread %-6s, tid %lu\n",
 338                         "main", urcu_get_thread_id());
 339
 340         tid_reader = calloc(nr_readers, sizeof(*tid_reader));
 341         tid_writer = calloc(nr_writers, sizeof(*tid_writer));
 342         count_reader = calloc(nr_readers, sizeof(*count_reader));
 343         count_writer = calloc(nr_writers, sizeof(*count_writer));
 344         tot_nr_reads = calloc(nr_readers, sizeof(*tot_nr_reads));
 345         tot_nr_writes = calloc(nr_writers, sizeof(*tot_nr_writes));
 346
 347         next_aff = 0;
 348
 349         for (i = 0; i < nr_readers; i++) {
 350                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 351                                      (void *)(long)i);
 352                 if (err != 0)
 353                         exit(1);
 354         }
 355         for (i = 0; i < nr_writers; i++) {
 356                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 357                                      (void *)(long)i);
 358                 if (err != 0)
 359                         exit(1);
 360         }
 361
 362         cmm_smp_mb();
 363
 364         test_go = 1;
 365
 366         sleep(duration);
 367
 368         test_stop = 1;
 369
 370         for (i = 0; i < nr_readers; i++) {
 371                 err = pthread_join(tid_reader[i], &tret);
 372                 if (err != 0)
 373                         exit(1);
 374                 tot_reads += tot_nr_reads[i];
 375         }
 376         for (i = 0; i < nr_writers; i++) {
 377                 err = pthread_join(tid_writer[i], &tret);
 378                 if (err != 0)
 379                         exit(1);
 380                 tot_writes += tot_nr_writes[i];
 381         }
 382
 383         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 384                tot_writes);
 385         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 386                 "nr_writers %3u "
 387                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 388                 argv[0], duration, nr_readers, rduration, wduration,
 389                 nr_writers, wdelay, tot_reads, tot_writes,
 390                 tot_reads + tot_writes);
 391
 392         free(tid_reader);
 393         free(tid_writer);
 394         free(count_reader);
 395         free(count_writer);
 396         free(tot_nr_reads);
 397         free(tot_nr_writes);
 398         return 0;
 399 }