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