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