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