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