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 "cpuset.h"
  37 #include "thread-id.h"
  38
  39 /* hardcoded number of CPUs */
  40 #define NR_CPUS 16384
  41
  42 #ifndef DYNAMIC_LINK_TEST
  43 #define _LGPL_SOURCE
  44 #endif
  45 #include <urcu.h>
  46
  47 struct test_array {
  48         int a;
  49 };
  50
  51 struct per_thread_lock {
  52         pthread_mutex_t lock;
  53 } __attribute__((aligned(CAA_CACHE_LINE_SIZE)));        /* cache-line aligned */
  54
  55 static struct per_thread_lock *per_thread_lock;
  56
  57 static volatile int test_go, test_stop;
  58
  59 static unsigned long wdelay;
  60
  61 static volatile struct test_array test_array = { 8 };
  62
  63 static unsigned long duration;
  64
  65 /* read-side C.S. duration, in loops */
  66 static unsigned long rduration;
  67
  68 /* write-side C.S. duration, in loops */
  69 static unsigned long wduration;
  70
  71 static inline void loop_sleep(unsigned long loops)
  72 {
  73         while (loops-- != 0)
  74                 caa_cpu_relax();
  75 }
  76
  77 static int verbose_mode;
  78
  79 #define printf_verbose(fmt, args...)            \
  80         do {                                    \
  81                 if (verbose_mode)               \
  82                         printf(fmt, args);      \
  83         } while (0)
  84
  85 static unsigned int cpu_affinities[NR_CPUS];
  86 static unsigned int next_aff = 0;
  87 static int use_affinity = 0;
  88
  89 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
  90
  91 static void set_affinity(void)
  92 {
  93 #if HAVE_SCHED_SETAFFINITY
  94         cpu_set_t mask;
  95         int cpu, ret;
  96 #endif /* HAVE_SCHED_SETAFFINITY */
  97
  98         if (!use_affinity)
  99                 return;
 100
 101 #if HAVE_SCHED_SETAFFINITY
 102         ret = pthread_mutex_lock(&affinity_mutex);
 103         if (ret) {
 104                 errno = ret;
 105                 perror("Error in pthread mutex lock");
 106                 abort();
 107         }
 108         cpu = cpu_affinities[next_aff++];
 109         ret = pthread_mutex_unlock(&affinity_mutex);
 110         if (ret) {
 111                 errno = ret;
 112                 perror("Error in pthread mutex unlock");
 113                 abort();
 114         }
 115         CPU_ZERO(&mask);
 116         CPU_SET(cpu, &mask);
 117 #if SCHED_SETAFFINITY_ARGS == 2
 118         sched_setaffinity(0, &mask);
 119 #else
 120         sched_setaffinity(0, sizeof(mask), &mask);
 121 #endif
 122 #endif /* HAVE_SCHED_SETAFFINITY */
 123 }
 124
 125 /*
 126  * returns 0 if test should end.
 127  */
 128 static int test_duration_write(void)
 129 {
 130         return !test_stop;
 131 }
 132
 133 static int test_duration_read(void)
 134 {
 135         return !test_stop;
 136 }
 137
 138 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
 139 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
 140
 141 static
 142 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_writes;
 143 static
 144 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_reads;
 145
 146 static unsigned int nr_readers;
 147 static unsigned int nr_writers;
 148
 149 static void urcu_mutex_lock(pthread_mutex_t *lock)
 150 {
 151         int ret;
 152
 153         ret = pthread_mutex_lock(lock);
 154         if (ret) {
 155                 errno = ret;
 156                 perror("Error in pthread mutex lock");
 157                 abort();
 158         }
 159 }
 160
 161 static void urcu_mutex_unlock(pthread_mutex_t *lock)
 162 {
 163         int ret;
 164
 165         ret = pthread_mutex_unlock(lock);
 166         if (ret) {
 167                 errno = ret;
 168                 perror("Error in pthread mutex unlock");
 169                 abort();
 170         }
 171 }
 172
 173 void *thr_reader(void *data)
 174 {
 175         unsigned long tidx = (unsigned long)data;
 176
 177         printf_verbose("thread_begin %s, tid %lu\n",
 178                         "reader", urcu_get_thread_id());
 179
 180         set_affinity();
 181
 182         while (!test_go)
 183         {
 184         }
 185
 186         for (;;) {
 187                 int v;
 188
 189                 urcu_mutex_lock(&per_thread_lock[tidx].lock);
 190                 v = test_array.a;
 191                 assert(v == 8);
 192                 if (caa_unlikely(rduration))
 193                         loop_sleep(rduration);
 194                 urcu_mutex_unlock(&per_thread_lock[tidx].lock);
 195                 URCU_TLS(nr_reads)++;
 196                 if (caa_unlikely(!test_duration_read()))
 197                         break;
 198         }
 199
 200         tot_nr_reads[tidx] = URCU_TLS(nr_reads);
 201         printf_verbose("thread_end %s, tid %lu\n",
 202                         "reader", urcu_get_thread_id());
 203         return ((void*)1);
 204
 205 }
 206
 207 void *thr_writer(void *data)
 208 {
 209         unsigned long wtidx = (unsigned long)data;
 210         long tidx;
 211
 212         printf_verbose("thread_begin %s, tid %lu\n",
 213                         "writer", urcu_get_thread_id());
 214
 215         set_affinity();
 216
 217         while (!test_go)
 218         {
 219         }
 220         cmm_smp_mb();
 221
 222         for (;;) {
 223                 for (tidx = 0; tidx < nr_readers; tidx++) {
 224                         urcu_mutex_lock(&per_thread_lock[tidx].lock);
 225                 }
 226                 test_array.a = 0;
 227                 test_array.a = 8;
 228                 if (caa_unlikely(wduration))
 229                         loop_sleep(wduration);
 230                 for (tidx = (long)nr_readers - 1; tidx >= 0; tidx--) {
 231                         urcu_mutex_unlock(&per_thread_lock[tidx].lock);
 232                 }
 233                 URCU_TLS(nr_writes)++;
 234                 if (caa_unlikely(!test_duration_write()))
 235                         break;
 236                 if (caa_unlikely(wdelay))
 237                         loop_sleep(wdelay);
 238         }
 239
 240         printf_verbose("thread_end %s, tid %lu\n",
 241                         "writer", urcu_get_thread_id());
 242         tot_nr_writes[wtidx] = URCU_TLS(nr_writes);
 243         return ((void*)2);
 244 }
 245
 246 void show_usage(int argc, char **argv)
 247 {
 248         printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
 249                 argv[0]);
 250         printf("OPTIONS:\n");
 251         printf("        [-d delay] (writer period (us))\n");
 252         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 253         printf("        [-e duration] (writer C.S. duration (in loops))\n");
 254         printf("        [-v] (verbose output)\n");
 255         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 256         printf("\n");
 257 }
 258
 259 int main(int argc, char **argv)
 260 {
 261         int err;
 262         pthread_t *tid_reader, *tid_writer;
 263         void *tret;
 264         unsigned long long tot_reads = 0, tot_writes = 0;
 265         int i, a;
 266
 267         if (argc < 4) {
 268                 show_usage(argc, argv);
 269                 return -1;
 270         }
 271         cmm_smp_mb();
 272
 273         err = sscanf(argv[1], "%u", &nr_readers);
 274         if (err != 1) {
 275                 show_usage(argc, argv);
 276                 return -1;
 277         }
 278
 279         err = sscanf(argv[2], "%u", &nr_writers);
 280         if (err != 1) {
 281                 show_usage(argc, argv);
 282                 return -1;
 283         }
 284
 285         err = sscanf(argv[3], "%lu", &duration);
 286         if (err != 1) {
 287                 show_usage(argc, argv);
 288                 return -1;
 289         }
 290
 291         for (i = 4; i < argc; i++) {
 292                 if (argv[i][0] != '-')
 293                         continue;
 294                 switch (argv[i][1]) {
 295                 case 'a':
 296                         if (argc < i + 2) {
 297                                 show_usage(argc, argv);
 298                                 return -1;
 299                         }
 300                         a = atoi(argv[++i]);
 301                         cpu_affinities[next_aff++] = a;
 302                         use_affinity = 1;
 303                         printf_verbose("Adding CPU %d affinity\n", a);
 304                         break;
 305                 case 'c':
 306                         if (argc < i + 2) {
 307                                 show_usage(argc, argv);
 308                                 return -1;
 309                         }
 310                         rduration = atol(argv[++i]);
 311                         break;
 312                 case 'd':
 313                         if (argc < i + 2) {
 314                                 show_usage(argc, argv);
 315                                 return -1;
 316                         }
 317                         wdelay = atol(argv[++i]);
 318                         break;
 319                 case 'e':
 320                         if (argc < i + 2) {
 321                                 show_usage(argc, argv);
 322                                 return -1;
 323                         }
 324                         wduration = atol(argv[++i]);
 325                         break;
 326                 case 'v':
 327                         verbose_mode = 1;
 328                         break;
 329                 }
 330         }
 331
 332         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 333                 duration, nr_readers, nr_writers);
 334         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 335         printf_verbose("Reader duration : %lu loops.\n", rduration);
 336         printf_verbose("thread %-6s, tid %lu\n",
 337                         "main", urcu_get_thread_id());
 338
 339         tid_reader = calloc(nr_readers, sizeof(*tid_reader));
 340         tid_writer = calloc(nr_writers, sizeof(*tid_writer));
 341         tot_nr_reads = calloc(nr_readers, sizeof(*tot_nr_reads));
 342         tot_nr_writes = calloc(nr_writers, sizeof(*tot_nr_writes));
 343         per_thread_lock = calloc(nr_readers, sizeof(*per_thread_lock));
 344         for (i = 0; i < nr_readers; i++) {
 345                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 346         }
 347
 348         next_aff = 0;
 349
 350         for (i = 0; i < nr_readers; i++) {
 351                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 352                                      (void *)(long)i);
 353                 if (err != 0)
 354                         exit(1);
 355         }
 356         for (i = 0; i < nr_writers; i++) {
 357                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 358                                      (void *)(long)i);
 359                 if (err != 0)
 360                         exit(1);
 361         }
 362
 363         cmm_smp_mb();
 364
 365         test_go = 1;
 366
 367         sleep(duration);
 368
 369         test_stop = 1;
 370
 371         for (i = 0; i < nr_readers; i++) {
 372                 err = pthread_join(tid_reader[i], &tret);
 373                 if (err != 0)
 374                         exit(1);
 375                 tot_reads += tot_nr_reads[i];
 376         }
 377         for (i = 0; i < nr_writers; i++) {
 378                 err = pthread_join(tid_writer[i], &tret);
 379                 if (err != 0)
 380                         exit(1);
 381                 tot_writes += tot_nr_writes[i];
 382         }
 383
 384         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 385                tot_writes);
 386         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 387                 "nr_writers %3u "
 388                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 389                 argv[0], duration, nr_readers, rduration, wduration,
 390                 nr_writers, wdelay, tot_reads, tot_writes,
 391                 tot_reads + tot_writes);
 392
 393         free(tid_reader);
 394         free(tid_writer);
 395         free(tot_nr_reads);
 396         free(tot_nr_writes);
 397         free(per_thread_lock);
 398         return 0;
 399 }