tests/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
  40 #ifdef __linux__
  41 #include <syscall.h>
  42 #endif
  43
  44 /* hardcoded number of CPUs */
  45 #define NR_CPUS 16384
  46
  47 #if defined(_syscall0)
  48 _syscall0(pid_t, gettid)
  49 #elif defined(__NR_gettid)
  50 static inline pid_t gettid(void)
  51 {
  52         return syscall(__NR_gettid);
  53 }
  54 #else
  55 #warning "use pid as tid"
  56 static inline pid_t gettid(void)
  57 {
  58         return getpid();
  59 }
  60 #endif
  61
  62 #ifndef DYNAMIC_LINK_TEST
  63 #define _LGPL_SOURCE
  64 #else
  65 #define debug_yield_read()
  66 #endif
  67 #include <urcu.h>
  68
  69 struct test_array {
  70         int a;
  71 };
  72
  73 static pthread_mutex_t lock;
  74
  75 static volatile int test_go, test_stop;
  76
  77 static unsigned long wdelay;
  78
  79 static volatile struct test_array test_array = { 8 };
  80
  81 static unsigned long duration;
  82
  83 /* read-side C.S. duration, in loops */
  84 static unsigned long rduration;
  85
  86 /* write-side C.S. duration, in loops */
  87 static unsigned long wduration;
  88
  89 static inline void loop_sleep(unsigned long loops)
  90 {
  91         while (loops-- != 0)
  92                 caa_cpu_relax();
  93 }
  94
  95 static int verbose_mode;
  96
  97 #define printf_verbose(fmt, args...)            \
  98         do {                                    \
  99                 if (verbose_mode)               \
 100                         printf(fmt, args);      \
 101         } while (0)
 102
 103 static unsigned int cpu_affinities[NR_CPUS];
 104 static unsigned int next_aff = 0;
 105 static int use_affinity = 0;
 106
 107 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 108
 109 static void set_affinity(void)
 110 {
 111 #if HAVE_SCHED_SETAFFINITY
 112         cpu_set_t mask;
 113         int cpu, ret;
 114 #endif /* HAVE_SCHED_SETAFFINITY */
 115
 116         if (!use_affinity)
 117                 return;
 118
 119 #if HAVE_SCHED_SETAFFINITY
 120         ret = pthread_mutex_lock(&affinity_mutex);
 121         if (ret) {
 122                 perror("Error in pthread mutex lock");
 123                 exit(-1);
 124         }
 125         cpu = cpu_affinities[next_aff++];
 126         ret = pthread_mutex_unlock(&affinity_mutex);
 127         if (ret) {
 128                 perror("Error in pthread mutex unlock");
 129                 exit(-1);
 130         }
 131         CPU_ZERO(&mask);
 132         CPU_SET(cpu, &mask);
 133 #if SCHED_SETAFFINITY_ARGS == 2
 134         sched_setaffinity(0, &mask);
 135 #else
 136         sched_setaffinity(0, sizeof(mask), &mask);
 137 #endif
 138 #endif /* HAVE_SCHED_SETAFFINITY */
 139 }
 140
 141 /*
 142  * returns 0 if test should end.
 143  */
 144 static int test_duration_write(void)
 145 {
 146         return !test_stop;
 147 }
 148
 149 static int test_duration_read(void)
 150 {
 151         return !test_stop;
 152 }
 153
 154 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
 155 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
 156
 157 static
 158 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_writes;
 159 static
 160 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_reads;
 161
 162 static unsigned int nr_readers;
 163 static unsigned int nr_writers;
 164
 165 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 166
 167 void rcu_copy_mutex_lock(void)
 168 {
 169         int ret;
 170         ret = pthread_mutex_lock(&rcu_copy_mutex);
 171         if (ret) {
 172                 perror("Error in pthread mutex lock");
 173                 exit(-1);
 174         }
 175 }
 176
 177 void rcu_copy_mutex_unlock(void)
 178 {
 179         int ret;
 180
 181         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 182         if (ret) {
 183                 perror("Error in pthread mutex unlock");
 184                 exit(-1);
 185         }
 186 }
 187
 188 void *thr_reader(void *data)
 189 {
 190         unsigned long tidx = (unsigned long)data;
 191
 192         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 193                         "reader", (unsigned long) pthread_self(),
 194                         (unsigned long) gettid());
 195
 196         set_affinity();
 197
 198         while (!test_go)
 199         {
 200         }
 201
 202         for (;;) {
 203                 pthread_mutex_lock(&lock);
 204                 assert(test_array.a == 8);
 205                 if (caa_unlikely(rduration))
 206                         loop_sleep(rduration);
 207                 pthread_mutex_unlock(&lock);
 208                 URCU_TLS(nr_reads)++;
 209                 if (caa_unlikely(!test_duration_read()))
 210                         break;
 211         }
 212
 213         tot_nr_reads[tidx] = URCU_TLS(nr_reads);
 214         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 215                         "reader", (unsigned long) pthread_self(),
 216                         (unsigned long) gettid());
 217         return ((void*)1);
 218
 219 }
 220
 221 void *thr_writer(void *data)
 222 {
 223         unsigned long wtidx = (unsigned long)data;
 224
 225         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 226                         "writer", (unsigned long) pthread_self(),
 227                         (unsigned long) gettid());
 228
 229         set_affinity();
 230
 231         while (!test_go)
 232         {
 233         }
 234         cmm_smp_mb();
 235
 236         for (;;) {
 237                 pthread_mutex_lock(&lock);
 238                 test_array.a = 0;
 239                 test_array.a = 8;
 240                 if (caa_unlikely(wduration))
 241                         loop_sleep(wduration);
 242                 pthread_mutex_unlock(&lock);
 243                 URCU_TLS(nr_writes)++;
 244                 if (caa_unlikely(!test_duration_write()))
 245                         break;
 246                 if (caa_unlikely(wdelay))
 247                         loop_sleep(wdelay);
 248         }
 249
 250         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 251                         "writer", (unsigned long) pthread_self(),
 252                         (unsigned long) gettid());
 253         tot_nr_writes[wtidx] = URCU_TLS(nr_writes);
 254         return ((void*)2);
 255 }
 256
 257 void show_usage(int argc, char **argv)
 258 {
 259         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 260 #ifdef DEBUG_YIELD
 261         printf(" [-r] [-w] (yield reader and/or writer)");
 262 #endif
 263         printf(" [-d delay] (writer period (us))");
 264         printf(" [-c duration] (reader C.S. duration (in loops))");
 265         printf(" [-e duration] (writer C.S. duration (in loops))");
 266         printf(" [-v] (verbose output)");
 267         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 268         printf("\n");
 269 }
 270
 271 int main(int argc, char **argv)
 272 {
 273         int err;
 274         pthread_t *tid_reader, *tid_writer;
 275         void *tret;
 276         unsigned long long *count_reader, *count_writer;
 277         unsigned long long tot_reads = 0, tot_writes = 0;
 278         int i, a;
 279
 280         if (argc < 4) {
 281                 show_usage(argc, argv);
 282                 return -1;
 283         }
 284         cmm_smp_mb();
 285
 286         err = sscanf(argv[1], "%u", &nr_readers);
 287         if (err != 1) {
 288                 show_usage(argc, argv);
 289                 return -1;
 290         }
 291
 292         err = sscanf(argv[2], "%u", &nr_writers);
 293         if (err != 1) {
 294                 show_usage(argc, argv);
 295                 return -1;
 296         }
 297
 298         err = sscanf(argv[3], "%lu", &duration);
 299         if (err != 1) {
 300                 show_usage(argc, argv);
 301                 return -1;
 302         }
 303
 304         for (i = 4; i < argc; i++) {
 305                 if (argv[i][0] != '-')
 306                         continue;
 307                 switch (argv[i][1]) {
 308 #ifdef DEBUG_YIELD
 309                 case 'r':
 310                         yield_active |= YIELD_READ;
 311                         break;
 312                 case 'w':
 313                         yield_active |= YIELD_WRITE;
 314                         break;
 315 #endif
 316                 case 'a':
 317                         if (argc < i + 2) {
 318                                 show_usage(argc, argv);
 319                                 return -1;
 320                         }
 321                         a = atoi(argv[++i]);
 322                         cpu_affinities[next_aff++] = a;
 323                         use_affinity = 1;
 324                         printf_verbose("Adding CPU %d affinity\n", a);
 325                         break;
 326                 case 'c':
 327                         if (argc < i + 2) {
 328                                 show_usage(argc, argv);
 329                                 return -1;
 330                         }
 331                         rduration = atol(argv[++i]);
 332                         break;
 333                 case 'd':
 334                         if (argc < i + 2) {
 335                                 show_usage(argc, argv);
 336                                 return -1;
 337                         }
 338                         wdelay = atol(argv[++i]);
 339                         break;
 340                 case 'e':
 341                         if (argc < i + 2) {
 342                                 show_usage(argc, argv);
 343                                 return -1;
 344                         }
 345                         wduration = atol(argv[++i]);
 346                         break;
 347                 case 'v':
 348                         verbose_mode = 1;
 349                         break;
 350                 }
 351         }
 352
 353         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 354                 duration, nr_readers, nr_writers);
 355         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 356         printf_verbose("Reader duration : %lu loops.\n", rduration);
 357         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 358                         "main", (unsigned long) pthread_self(),
 359                         (unsigned long) gettid());
 360
 361         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 362         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 363         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 364         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 365         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 366         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 367
 368         next_aff = 0;
 369
 370         for (i = 0; i < nr_readers; i++) {
 371                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 372                                      (void *)(long)i);
 373                 if (err != 0)
 374                         exit(1);
 375         }
 376         for (i = 0; i < nr_writers; i++) {
 377                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 378                                      (void *)(long)i);
 379                 if (err != 0)
 380                         exit(1);
 381         }
 382
 383         cmm_smp_mb();
 384
 385         test_go = 1;
 386
 387         sleep(duration);
 388
 389         test_stop = 1;
 390
 391         for (i = 0; i < nr_readers; i++) {
 392                 err = pthread_join(tid_reader[i], &tret);
 393                 if (err != 0)
 394                         exit(1);
 395                 tot_reads += tot_nr_reads[i];
 396         }
 397         for (i = 0; i < nr_writers; i++) {
 398                 err = pthread_join(tid_writer[i], &tret);
 399                 if (err != 0)
 400                         exit(1);
 401                 tot_writes += tot_nr_writes[i];
 402         }
 403
 404         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 405                tot_writes);
 406         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 407                 "nr_writers %3u "
 408                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 409                 argv[0], duration, nr_readers, rduration, wduration,
 410                 nr_writers, wdelay, tot_reads, tot_writes,
 411                 tot_reads + tot_writes);
 412
 413         free(tid_reader);
 414         free(tid_writer);
 415         free(count_reader);
 416         free(count_writer);
 417         free(tot_nr_reads);
 418         free(tot_nr_writes);
 419         return 0;
 420 }