tests/benchmark/test_urcu_qsbr.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 #include "../common/debug-yield.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-qsbr.h"
  46
  47 static volatile int test_go, test_stop;
  48
  49 static unsigned long wdelay;
  50
  51 static int *test_rcu_pointer;
  52
  53 static unsigned long duration;
  54
  55 /* read-side C.S. duration, in loops */
  56 static unsigned long rduration;
  57
  58 /* write-side C.S. duration, in loops */
  59 static unsigned long wduration;
  60
  61 static inline void loop_sleep(unsigned long loops)
  62 {
  63         while (loops-- != 0)
  64                 caa_cpu_relax();
  65 }
  66
  67 static int verbose_mode;
  68
  69 #define printf_verbose(fmt, args...)            \
  70         do {                                    \
  71                 if (verbose_mode)               \
  72                         printf(fmt, args);      \
  73         } while (0)
  74
  75 static unsigned int cpu_affinities[NR_CPUS];
  76 static unsigned int next_aff = 0;
  77 static int use_affinity = 0;
  78
  79 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
  80
  81 static void set_affinity(void)
  82 {
  83 #ifdef HAVE_SCHED_SETAFFINITY
  84         cpu_set_t mask;
  85         int cpu, ret;
  86 #endif /* HAVE_SCHED_SETAFFINITY */
  87
  88         if (!use_affinity)
  89                 return;
  90
  91 #ifdef HAVE_SCHED_SETAFFINITY
  92         ret = pthread_mutex_lock(&affinity_mutex);
  93         if (ret) {
  94                 perror("Error in pthread mutex lock");
  95                 exit(-1);
  96         }
  97         cpu = cpu_affinities[next_aff++];
  98         ret = pthread_mutex_unlock(&affinity_mutex);
  99         if (ret) {
 100                 perror("Error in pthread mutex unlock");
 101                 exit(-1);
 102         }
 103         CPU_ZERO(&mask);
 104         CPU_SET(cpu, &mask);
 105         sched_setaffinity(0, sizeof(mask), &mask);
 106 #endif /* HAVE_SCHED_SETAFFINITY */
 107 }
 108
 109 /*
 110  * returns 0 if test should end.
 111  */
 112 static int test_duration_write(void)
 113 {
 114         return !test_stop;
 115 }
 116
 117 static int test_duration_read(void)
 118 {
 119         return !test_stop;
 120 }
 121
 122 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
 123 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
 124
 125 static unsigned int nr_readers;
 126 static unsigned int nr_writers;
 127
 128 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 129
 130 static
 131 void *thr_reader(void *_count)
 132 {
 133         unsigned long long *count = _count;
 134         int *local_ptr;
 135
 136         printf_verbose("thread_begin %s, tid %lu\n",
 137                         "reader", urcu_get_thread_id());
 138
 139         set_affinity();
 140
 141         rcu_register_thread();
 142
 143         assert(rcu_read_ongoing());
 144         rcu_thread_offline();
 145         assert(!rcu_read_ongoing());
 146         rcu_thread_online();
 147
 148         while (!test_go)
 149         {
 150         }
 151         cmm_smp_mb();
 152
 153         for (;;) {
 154                 rcu_read_lock();
 155                 assert(rcu_read_ongoing());
 156                 local_ptr = rcu_dereference(test_rcu_pointer);
 157                 rcu_debug_yield_read();
 158                 if (local_ptr)
 159                         assert(*local_ptr == 8);
 160                 if (caa_unlikely(rduration))
 161                         loop_sleep(rduration);
 162                 rcu_read_unlock();
 163                 URCU_TLS(nr_reads)++;
 164                 /* QS each 1024 reads */
 165                 if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0))
 166                         rcu_quiescent_state();
 167                 if (caa_unlikely(!test_duration_read()))
 168                         break;
 169         }
 170
 171         rcu_unregister_thread();
 172
 173         /* test extra thread registration */
 174         rcu_register_thread();
 175         rcu_unregister_thread();
 176
 177         *count = URCU_TLS(nr_reads);
 178         printf_verbose("thread_end %s, tid %lu\n",
 179                         "reader", urcu_get_thread_id());
 180         return ((void*)1);
 181
 182 }
 183
 184 static
 185 void *thr_writer(void *_count)
 186 {
 187         unsigned long long *count = _count;
 188         int *new, *old;
 189
 190         printf_verbose("thread_begin %s, tid %lu\n",
 191                         "writer", urcu_get_thread_id());
 192
 193         set_affinity();
 194
 195         while (!test_go)
 196         {
 197         }
 198         cmm_smp_mb();
 199
 200         for (;;) {
 201                 new = malloc(sizeof(int));
 202                 assert(new);
 203                 *new = 8;
 204                 old = rcu_xchg_pointer(&test_rcu_pointer, new);
 205                 if (caa_unlikely(wduration))
 206                         loop_sleep(wduration);
 207                 synchronize_rcu();
 208                 if (old)
 209                         *old = 0;
 210                 free(old);
 211                 URCU_TLS(nr_writes)++;
 212                 if (caa_unlikely(!test_duration_write()))
 213                         break;
 214                 if (caa_unlikely(wdelay))
 215                         loop_sleep(wdelay);
 216         }
 217
 218         printf_verbose("thread_end %s, tid %lu\n",
 219                         "writer", urcu_get_thread_id());
 220         *count = URCU_TLS(nr_writes);
 221         return ((void*)2);
 222 }
 223
 224 static
 225 void show_usage(char **argv)
 226 {
 227         printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
 228                 argv[0]);
 229         printf("OPTIONS:\n");
 230         printf("        [-r] [-w] (yield reader and/or writer)\n");
 231         printf("        [-d delay] (writer period (us))\n");
 232         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 233         printf("        [-e duration] (writer C.S. duration (in loops))\n");
 234         printf("        [-v] (verbose output)\n");
 235         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 236         printf("\n");
 237 }
 238
 239 int main(int argc, char **argv)
 240 {
 241         int err;
 242         pthread_t *tid_reader, *tid_writer;
 243         void *tret;
 244         unsigned long long *count_reader, *count_writer;
 245         unsigned long long tot_reads = 0, tot_writes = 0;
 246         int i, a;
 247         unsigned int i_thr;
 248
 249         if (argc < 4) {
 250                 show_usage(argv);
 251                 return -1;
 252         }
 253
 254         err = sscanf(argv[1], "%u", &nr_readers);
 255         if (err != 1) {
 256                 show_usage(argv);
 257                 return -1;
 258         }
 259
 260         err = sscanf(argv[2], "%u", &nr_writers);
 261         if (err != 1) {
 262                 show_usage(argv);
 263                 return -1;
 264         }
 265
 266         err = sscanf(argv[3], "%lu", &duration);
 267         if (err != 1) {
 268                 show_usage(argv);
 269                 return -1;
 270         }
 271
 272         for (i = 4; i < argc; i++) {
 273                 if (argv[i][0] != '-')
 274                         continue;
 275                 switch (argv[i][1]) {
 276                 case 'r':
 277                         rcu_debug_yield_enable(RCU_YIELD_READ);
 278                         break;
 279                 case 'w':
 280                         rcu_debug_yield_enable(RCU_YIELD_WRITE);
 281                         break;
 282                 case 'a':
 283                         if (argc < i + 2) {
 284                                 show_usage(argv);
 285                                 return -1;
 286                         }
 287                         a = atoi(argv[++i]);
 288                         cpu_affinities[next_aff++] = a;
 289                         use_affinity = 1;
 290                         printf_verbose("Adding CPU %d affinity\n", a);
 291                         break;
 292                 case 'c':
 293                         if (argc < i + 2) {
 294                                 show_usage(argv);
 295                                 return -1;
 296                         }
 297                         rduration = atol(argv[++i]);
 298                         break;
 299                 case 'd':
 300                         if (argc < i + 2) {
 301                                 show_usage(argv);
 302                                 return -1;
 303                         }
 304                         wdelay = atol(argv[++i]);
 305                         break;
 306                 case 'e':
 307                         if (argc < i + 2) {
 308                                 show_usage(argv);
 309                                 return -1;
 310                         }
 311                         wduration = atol(argv[++i]);
 312                         break;
 313                 case 'v':
 314                         verbose_mode = 1;
 315                         break;
 316                 }
 317         }
 318
 319         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 320                 duration, nr_readers, nr_writers);
 321         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 322         printf_verbose("Reader duration : %lu loops.\n", rduration);
 323         printf_verbose("thread %-6s, tid %lu\n",
 324                         "main", urcu_get_thread_id());
 325
 326         tid_reader = calloc(nr_readers, sizeof(*tid_reader));
 327         tid_writer = calloc(nr_writers, sizeof(*tid_writer));
 328         count_reader = calloc(nr_readers, sizeof(*count_reader));
 329         count_writer = calloc(nr_writers, sizeof(*count_writer));
 330
 331         next_aff = 0;
 332
 333         for (i_thr = 0; i_thr < nr_readers; i_thr++) {
 334                 err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
 335                                      &count_reader[i_thr]);
 336                 if (err != 0)
 337                         exit(1);
 338         }
 339         for (i_thr = 0; i_thr < nr_writers; i_thr++) {
 340                 err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
 341                                      &count_writer[i_thr]);
 342                 if (err != 0)
 343                         exit(1);
 344         }
 345
 346         cmm_smp_mb();
 347
 348         test_go = 1;
 349
 350         sleep(duration);
 351
 352         test_stop = 1;
 353
 354         for (i_thr = 0; i_thr < nr_readers; i_thr++) {
 355                 err = pthread_join(tid_reader[i_thr], &tret);
 356                 if (err != 0)
 357                         exit(1);
 358                 tot_reads += count_reader[i_thr];
 359         }
 360         for (i_thr = 0; i_thr < nr_writers; i_thr++) {
 361                 err = pthread_join(tid_writer[i_thr], &tret);
 362                 if (err != 0)
 363                         exit(1);
 364                 tot_writes += count_writer[i_thr];
 365         }
 366
 367         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 368                tot_writes);
 369         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 370                 "nr_writers %3u "
 371                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 372                 argv[0], duration, nr_readers, rduration, wduration,
 373                 nr_writers, wdelay, tot_reads, tot_writes,
 374                 tot_reads + tot_writes);
 375         free(test_rcu_pointer);
 376         free(tid_reader);
 377         free(tid_writer);
 378         free(count_reader);
 379         free(count_writer);
 380         return 0;
 381 }