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                 perror("Error in pthread mutex lock");
 107                 exit(-1);
 108         }
 109         cpu = cpu_affinities[next_aff++];
 110         ret = pthread_mutex_unlock(&affinity_mutex);
 111         if (ret) {
 112                 perror("Error in pthread mutex unlock");
 113                 exit(-1);
 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 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 150
 151 void rcu_copy_mutex_lock(void)
 152 {
 153         int ret;
 154         ret = pthread_mutex_lock(&rcu_copy_mutex);
 155         if (ret) {
 156                 perror("Error in pthread mutex lock");
 157                 exit(-1);
 158         }
 159 }
 160
 161 void rcu_copy_mutex_unlock(void)
 162 {
 163         int ret;
 164
 165         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 166         if (ret) {
 167                 perror("Error in pthread mutex unlock");
 168                 exit(-1);
 169         }
 170 }
 171
 172 void *thr_reader(void *data)
 173 {
 174         unsigned long tidx = (unsigned long)data;
 175
 176         printf_verbose("thread_begin %s, tid %lu\n",
 177                         "reader", urcu_get_thread_id());
 178
 179         set_affinity();
 180
 181         while (!test_go)
 182         {
 183         }
 184
 185         for (;;) {
 186                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 187                 assert(test_array.a == 8);
 188                 if (caa_unlikely(rduration))
 189                         loop_sleep(rduration);
 190                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 191                 URCU_TLS(nr_reads)++;
 192                 if (caa_unlikely(!test_duration_read()))
 193                         break;
 194         }
 195
 196         tot_nr_reads[tidx] = URCU_TLS(nr_reads);
 197         printf_verbose("thread_end %s, tid %lu\n",
 198                         "reader", urcu_get_thread_id());
 199         return ((void*)1);
 200
 201 }
 202
 203 void *thr_writer(void *data)
 204 {
 205         unsigned long wtidx = (unsigned long)data;
 206         long tidx;
 207
 208         printf_verbose("thread_begin %s, tid %lu\n",
 209                         "writer", urcu_get_thread_id());
 210
 211         set_affinity();
 212
 213         while (!test_go)
 214         {
 215         }
 216         cmm_smp_mb();
 217
 218         for (;;) {
 219                 for (tidx = 0; tidx < nr_readers; tidx++) {
 220                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 221                 }
 222                 test_array.a = 0;
 223                 test_array.a = 8;
 224                 if (caa_unlikely(wduration))
 225                         loop_sleep(wduration);
 226                 for (tidx = (long)nr_readers - 1; tidx >= 0; tidx--) {
 227                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 228                 }
 229                 URCU_TLS(nr_writes)++;
 230                 if (caa_unlikely(!test_duration_write()))
 231                         break;
 232                 if (caa_unlikely(wdelay))
 233                         loop_sleep(wdelay);
 234         }
 235
 236         printf_verbose("thread_end %s, tid %lu\n",
 237                         "writer", urcu_get_thread_id());
 238         tot_nr_writes[wtidx] = URCU_TLS(nr_writes);
 239         return ((void*)2);
 240 }
 241
 242 void show_usage(int argc, char **argv)
 243 {
 244         printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
 245                 argv[0]);
 246         printf("OPTIONS:\n");
 247         printf("        [-d delay] (writer period (us))\n");
 248         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 249         printf("        [-e duration] (writer C.S. duration (in loops))\n");
 250         printf("        [-v] (verbose output)\n");
 251         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 252         printf("\n");
 253 }
 254
 255 int main(int argc, char **argv)
 256 {
 257         int err;
 258         pthread_t *tid_reader, *tid_writer;
 259         void *tret;
 260         unsigned long long tot_reads = 0, tot_writes = 0;
 261         int i, a;
 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 = 0; i < nr_readers; i++) {
 341                 err = pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 342                 if (err != 0)
 343                         exit(1);
 344         }
 345
 346         next_aff = 0;
 347
 348         for (i = 0; i < nr_readers; i++) {
 349                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 350                                      (void *)(long)i);
 351                 if (err != 0)
 352                         exit(1);
 353         }
 354         for (i = 0; i < nr_writers; i++) {
 355                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 356                                      (void *)(long)i);
 357                 if (err != 0)
 358                         exit(1);
 359         }
 360
 361         cmm_smp_mb();
 362
 363         test_go = 1;
 364
 365         sleep(duration);
 366
 367         test_stop = 1;
 368
 369         for (i = 0; i < nr_readers; i++) {
 370                 err = pthread_join(tid_reader[i], &tret);
 371                 if (err != 0)
 372                         exit(1);
 373                 tot_reads += tot_nr_reads[i];
 374         }
 375         for (i = 0; i < nr_writers; i++) {
 376                 err = pthread_join(tid_writer[i], &tret);
 377                 if (err != 0)
 378                         exit(1);
 379                 tot_writes += tot_nr_writes[i];
 380         }
 381
 382         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 383                tot_writes);
 384         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 385                 "nr_writers %3u "
 386                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 387                 argv[0], duration, nr_readers, rduration, wduration,
 388                 nr_writers, wdelay, tot_reads, tot_writes,
 389                 tot_reads + tot_writes);
 390
 391         free(tid_reader);
 392         free(tid_writer);
 393         free(tot_nr_reads);
 394         free(tot_nr_writes);
 395         free(per_thread_lock);
 396         return 0;
 397 }