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 <sys/syscall.h>
  35 #include <sched.h>
  36 #include <errno.h>
  37
  38 #include <urcu/arch.h>
  39
  40 /* hardcoded number of CPUs */
  41 #define NR_CPUS 16384
  42
  43 #if defined(_syscall0)
  44 _syscall0(pid_t, gettid)
  45 #elif defined(__NR_gettid)
  46 static inline pid_t gettid(void)
  47 {
  48         return syscall(__NR_gettid);
  49 }
  50 #else
  51 #warning "use pid as tid"
  52 static inline pid_t gettid(void)
  53 {
  54         return getpid();
  55 }
  56 #endif
  57
  58 #ifndef DYNAMIC_LINK_TEST
  59 #define _LGPL_SOURCE
  60 #else
  61 #define debug_yield_read()
  62 #endif
  63 #include <urcu.h>
  64
  65 struct test_array {
  66         int a;
  67 };
  68
  69 static pthread_mutex_t lock;
  70
  71 static volatile int test_go, test_stop;
  72
  73 static unsigned long wdelay;
  74
  75 static volatile struct test_array test_array = { 8 };
  76
  77 static unsigned long duration;
  78
  79 /* read-side C.S. duration, in loops */
  80 static unsigned long rduration;
  81
  82 /* write-side C.S. duration, in loops */
  83 static unsigned long wduration;
  84
  85 static inline void loop_sleep(unsigned long l)
  86 {
  87         while(l-- != 0)
  88                 cpu_relax();
  89 }
  90
  91 static int verbose_mode;
  92
  93 #define printf_verbose(fmt, args...)            \
  94         do {                                    \
  95                 if (verbose_mode)               \
  96                         printf(fmt, args);      \
  97         } while (0)
  98
  99 static unsigned int cpu_affinities[NR_CPUS];
 100 static unsigned int next_aff = 0;
 101 static int use_affinity = 0;
 102
 103 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 104
 105 #ifndef HAVE_CPU_SET_T
 106 typedef unsigned long cpu_set_t;
 107 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
 108 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
 109 #endif
 110
 111 static void set_affinity(void)
 112 {
 113         cpu_set_t mask;
 114         int cpu;
 115         int ret;
 116
 117         if (!use_affinity)
 118                 return;
 119
 120 #if HAVE_SCHED_SETAFFINITY
 121         ret = pthread_mutex_lock(&affinity_mutex);
 122         if (ret) {
 123                 perror("Error in pthread mutex lock");
 124                 exit(-1);
 125         }
 126         cpu = cpu_affinities[next_aff++];
 127         ret = pthread_mutex_unlock(&affinity_mutex);
 128         if (ret) {
 129                 perror("Error in pthread mutex unlock");
 130                 exit(-1);
 131         }
 132         CPU_ZERO(&mask);
 133         CPU_SET(cpu, &mask);
 134 #if SCHED_SETAFFINITY_ARGS == 2
 135         sched_setaffinity(0, &mask);
 136 #else
 137         sched_setaffinity(0, sizeof(mask), &mask);
 138 #endif
 139 #endif /* HAVE_SCHED_SETAFFINITY */
 140 }
 141
 142 /*
 143  * returns 0 if test should end.
 144  */
 145 static int test_duration_write(void)
 146 {
 147         return !test_stop;
 148 }
 149
 150 static int test_duration_read(void)
 151 {
 152         return !test_stop;
 153 }
 154
 155 static unsigned long long __thread nr_writes;
 156 static unsigned long long __thread nr_reads;
 157
 158 static
 159 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes;
 160 static
 161 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_reads;
 162
 163 static unsigned int nr_readers;
 164 static unsigned int nr_writers;
 165
 166 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 167
 168 void rcu_copy_mutex_lock(void)
 169 {
 170         int ret;
 171         ret = pthread_mutex_lock(&rcu_copy_mutex);
 172         if (ret) {
 173                 perror("Error in pthread mutex lock");
 174                 exit(-1);
 175         }
 176 }
 177
 178 void rcu_copy_mutex_unlock(void)
 179 {
 180         int ret;
 181
 182         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 183         if (ret) {
 184                 perror("Error in pthread mutex unlock");
 185                 exit(-1);
 186         }
 187 }
 188
 189 void *thr_reader(void *data)
 190 {
 191         unsigned long tidx = (unsigned long)data;
 192
 193         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 194                         "reader", pthread_self(), (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 (unlikely(rduration))
 206                         loop_sleep(rduration);
 207                 pthread_mutex_unlock(&lock);
 208                 nr_reads++;
 209                 if (unlikely(!test_duration_read()))
 210                         break;
 211         }
 212
 213         tot_nr_reads[tidx] = nr_reads;
 214         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 215                         "reader", pthread_self(), (unsigned long)gettid());
 216         return ((void*)1);
 217
 218 }
 219
 220 void *thr_writer(void *data)
 221 {
 222         unsigned long wtidx = (unsigned long)data;
 223
 224         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 225                         "writer", pthread_self(), (unsigned long)gettid());
 226
 227         set_affinity();
 228
 229         while (!test_go)
 230         {
 231         }
 232         smp_mb();
 233
 234         for (;;) {
 235                 pthread_mutex_lock(&lock);
 236                 test_array.a = 0;
 237                 test_array.a = 8;
 238                 if (unlikely(wduration))
 239                         loop_sleep(wduration);
 240                 pthread_mutex_unlock(&lock);
 241                 nr_writes++;
 242                 if (unlikely(!test_duration_write()))
 243                         break;
 244                 if (unlikely(wdelay))
 245                         loop_sleep(wdelay);
 246         }
 247
 248         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 249                         "writer", pthread_self(), (unsigned long)gettid());
 250         tot_nr_writes[wtidx] = nr_writes;
 251         return ((void*)2);
 252 }
 253
 254 void show_usage(int argc, char **argv)
 255 {
 256         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 257 #ifdef DEBUG_YIELD
 258         printf(" [-r] [-w] (yield reader and/or writer)");
 259 #endif
 260         printf(" [-d delay] (writer period (us))");
 261         printf(" [-c duration] (reader C.S. duration (in loops))");
 262         printf(" [-e duration] (writer C.S. duration (in loops))");
 263         printf(" [-v] (verbose output)");
 264         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 265         printf("\n");
 266 }
 267
 268 int main(int argc, char **argv)
 269 {
 270         int err;
 271         pthread_t *tid_reader, *tid_writer;
 272         void *tret;
 273         unsigned long long *count_reader, *count_writer;
 274         unsigned long long tot_reads = 0, tot_writes = 0;
 275         int i, a;
 276
 277         if (argc < 4) {
 278                 show_usage(argc, argv);
 279                 return -1;
 280         }
 281         smp_mb();
 282
 283         err = sscanf(argv[1], "%u", &nr_readers);
 284         if (err != 1) {
 285                 show_usage(argc, argv);
 286                 return -1;
 287         }
 288
 289         err = sscanf(argv[2], "%u", &nr_writers);
 290         if (err != 1) {
 291                 show_usage(argc, argv);
 292                 return -1;
 293         }
 294
 295         err = sscanf(argv[3], "%lu", &duration);
 296         if (err != 1) {
 297                 show_usage(argc, argv);
 298                 return -1;
 299         }
 300
 301         for (i = 4; i < argc; i++) {
 302                 if (argv[i][0] != '-')
 303                         continue;
 304                 switch (argv[i][1]) {
 305 #ifdef DEBUG_YIELD
 306                 case 'r':
 307                         yield_active |= YIELD_READ;
 308                         break;
 309                 case 'w':
 310                         yield_active |= YIELD_WRITE;
 311                         break;
 312 #endif
 313                 case 'a':
 314                         if (argc < i + 2) {
 315                                 show_usage(argc, argv);
 316                                 return -1;
 317                         }
 318                         a = atoi(argv[++i]);
 319                         cpu_affinities[next_aff++] = a;
 320                         use_affinity = 1;
 321                         printf_verbose("Adding CPU %d affinity\n", a);
 322                         break;
 323                 case 'c':
 324                         if (argc < i + 2) {
 325                                 show_usage(argc, argv);
 326                                 return -1;
 327                         }
 328                         rduration = atol(argv[++i]);
 329                         break;
 330                 case 'd':
 331                         if (argc < i + 2) {
 332                                 show_usage(argc, argv);
 333                                 return -1;
 334                         }
 335                         wdelay = atol(argv[++i]);
 336                         break;
 337                 case 'e':
 338                         if (argc < i + 2) {
 339                                 show_usage(argc, argv);
 340                                 return -1;
 341                         }
 342                         wduration = atol(argv[++i]);
 343                         break;
 344                 case 'v':
 345                         verbose_mode = 1;
 346                         break;
 347                 }
 348         }
 349
 350         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 351                 duration, nr_readers, nr_writers);
 352         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 353         printf_verbose("Reader duration : %lu loops.\n", rduration);
 354         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 355                         "main", pthread_self(), (unsigned long)gettid());
 356
 357         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 358         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 359         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 360         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 361         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 362         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 363
 364         next_aff = 0;
 365
 366         for (i = 0; i < nr_readers; i++) {
 367                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 368                                      (void *)(long)i);
 369                 if (err != 0)
 370                         exit(1);
 371         }
 372         for (i = 0; i < nr_writers; i++) {
 373                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 374                                      (void *)(long)i);
 375                 if (err != 0)
 376                         exit(1);
 377         }
 378
 379         smp_mb();
 380
 381         test_go = 1;
 382
 383         sleep(duration);
 384
 385         test_stop = 1;
 386
 387         for (i = 0; i < nr_readers; i++) {
 388                 err = pthread_join(tid_reader[i], &tret);
 389                 if (err != 0)
 390                         exit(1);
 391                 tot_reads += tot_nr_reads[i];
 392         }
 393         for (i = 0; i < nr_writers; i++) {
 394                 err = pthread_join(tid_writer[i], &tret);
 395                 if (err != 0)
 396                         exit(1);
 397                 tot_writes += tot_nr_writes[i];
 398         }
 399
 400         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 401                tot_writes);
 402         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 403                 "nr_writers %3u "
 404                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 405                 argv[0], duration, nr_readers, rduration, wduration,
 406                 nr_writers, wdelay, tot_reads, tot_writes,
 407                 tot_reads + tot_writes);
 408
 409         free(tid_reader);
 410         free(tid_writer);
 411         free(count_reader);
 412         free(count_writer);
 413         free(tot_nr_reads);
 414         free(tot_nr_writes);
 415         return 0;
 416 }