tests/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
  40 #ifdef __linux__
  41 #include <syscall.h>
  42 #endif
  43
  44 /* hardcoded number of CPUs */
  45 #define NR_CPUS 16384
  46
  47 #if defined(_syscall0)
  48 _syscall0(pid_t, gettid)
  49 #elif defined(__NR_gettid)
  50 static inline pid_t gettid(void)
  51 {
  52         return syscall(__NR_gettid);
  53 }
  54 #else
  55 #warning "use pid as tid"
  56 static inline pid_t gettid(void)
  57 {
  58         return getpid();
  59 }
  60 #endif
  61
  62 #ifndef DYNAMIC_LINK_TEST
  63 #define _LGPL_SOURCE
  64 #else
  65 #define debug_yield_read()
  66 #endif
  67 #include <urcu.h>
  68
  69 struct test_array {
  70         int a;
  71 };
  72
  73 struct per_thread_lock {
  74         pthread_mutex_t lock;
  75 } __attribute__((aligned(CAA_CACHE_LINE_SIZE)));        /* cache-line aligned */
  76
  77 static struct per_thread_lock *per_thread_lock;
  78
  79 static volatile int test_go, test_stop;
  80
  81 static unsigned long wdelay;
  82
  83 static volatile struct test_array test_array = { 8 };
  84
  85 static unsigned long duration;
  86
  87 /* read-side C.S. duration, in loops */
  88 static unsigned long rduration;
  89
  90 /* write-side C.S. duration, in loops */
  91 static unsigned long wduration;
  92
  93 static inline void loop_sleep(unsigned long loops)
  94 {
  95         while (loops-- != 0)
  96                 caa_cpu_relax();
  97 }
  98
  99 static int verbose_mode;
 100
 101 #define printf_verbose(fmt, args...)            \
 102         do {                                    \
 103                 if (verbose_mode)               \
 104                         printf(fmt, args);      \
 105         } while (0)
 106
 107 static unsigned int cpu_affinities[NR_CPUS];
 108 static unsigned int next_aff = 0;
 109 static int use_affinity = 0;
 110
 111 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 112
 113 static void set_affinity(void)
 114 {
 115 #if HAVE_SCHED_SETAFFINITY
 116         cpu_set_t mask;
 117         int cpu, ret;
 118 #endif /* HAVE_SCHED_SETAFFINITY */
 119
 120         if (!use_affinity)
 121                 return;
 122
 123 #if HAVE_SCHED_SETAFFINITY
 124         ret = pthread_mutex_lock(&affinity_mutex);
 125         if (ret) {
 126                 perror("Error in pthread mutex lock");
 127                 exit(-1);
 128         }
 129         cpu = cpu_affinities[next_aff++];
 130         ret = pthread_mutex_unlock(&affinity_mutex);
 131         if (ret) {
 132                 perror("Error in pthread mutex unlock");
 133                 exit(-1);
 134         }
 135         CPU_ZERO(&mask);
 136         CPU_SET(cpu, &mask);
 137 #if SCHED_SETAFFINITY_ARGS == 2
 138         sched_setaffinity(0, &mask);
 139 #else
 140         sched_setaffinity(0, sizeof(mask), &mask);
 141 #endif
 142 #endif /* HAVE_SCHED_SETAFFINITY */
 143 }
 144
 145 /*
 146  * returns 0 if test should end.
 147  */
 148 static int test_duration_write(void)
 149 {
 150         return !test_stop;
 151 }
 152
 153 static int test_duration_read(void)
 154 {
 155         return !test_stop;
 156 }
 157
 158 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
 159 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
 160
 161 static
 162 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_writes;
 163 static
 164 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_reads;
 165
 166 static unsigned int nr_readers;
 167 static unsigned int nr_writers;
 168
 169 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 170
 171 void rcu_copy_mutex_lock(void)
 172 {
 173         int ret;
 174         ret = pthread_mutex_lock(&rcu_copy_mutex);
 175         if (ret) {
 176                 perror("Error in pthread mutex lock");
 177                 exit(-1);
 178         }
 179 }
 180
 181 void rcu_copy_mutex_unlock(void)
 182 {
 183         int ret;
 184
 185         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 186         if (ret) {
 187                 perror("Error in pthread mutex unlock");
 188                 exit(-1);
 189         }
 190 }
 191
 192 void *thr_reader(void *data)
 193 {
 194         unsigned long tidx = (unsigned long)data;
 195
 196         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 197                         "reader", (unsigned long) pthread_self(),
 198                         (unsigned long) gettid());
 199
 200         set_affinity();
 201
 202         while (!test_go)
 203         {
 204         }
 205
 206         for (;;) {
 207                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 208                 assert(test_array.a == 8);
 209                 if (caa_unlikely(rduration))
 210                         loop_sleep(rduration);
 211                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 212                 URCU_TLS(nr_reads)++;
 213                 if (caa_unlikely(!test_duration_read()))
 214                         break;
 215         }
 216
 217         tot_nr_reads[tidx] = URCU_TLS(nr_reads);
 218         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 219                         "reader", (unsigned long) pthread_self(),
 220                         (unsigned long) gettid());
 221         return ((void*)1);
 222
 223 }
 224
 225 void *thr_writer(void *data)
 226 {
 227         unsigned long wtidx = (unsigned long)data;
 228         long tidx;
 229
 230         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 231                         "writer", (unsigned long) pthread_self(),
 232                         (unsigned long) gettid());
 233
 234         set_affinity();
 235
 236         while (!test_go)
 237         {
 238         }
 239         cmm_smp_mb();
 240
 241         for (;;) {
 242                 for (tidx = 0; tidx < nr_readers; tidx++) {
 243                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 244                 }
 245                 test_array.a = 0;
 246                 test_array.a = 8;
 247                 if (caa_unlikely(wduration))
 248                         loop_sleep(wduration);
 249                 for (tidx = (long)nr_readers - 1; tidx >= 0; tidx--) {
 250                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 251                 }
 252                 URCU_TLS(nr_writes)++;
 253                 if (caa_unlikely(!test_duration_write()))
 254                         break;
 255                 if (caa_unlikely(wdelay))
 256                         loop_sleep(wdelay);
 257         }
 258
 259         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 260                         "writer", (unsigned long) pthread_self(),
 261                         (unsigned long) gettid());
 262         tot_nr_writes[wtidx] = URCU_TLS(nr_writes);
 263         return ((void*)2);
 264 }
 265
 266 void show_usage(int argc, char **argv)
 267 {
 268         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 269 #ifdef DEBUG_YIELD
 270         printf(" [-r] [-w] (yield reader and/or writer)");
 271 #endif
 272         printf(" [-d delay] (writer period (us))");
 273         printf(" [-c duration] (reader C.S. duration (in loops))");
 274         printf(" [-e duration] (writer C.S. duration (in loops))");
 275         printf(" [-v] (verbose output)");
 276         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 277         printf("\n");
 278 }
 279
 280 int main(int argc, char **argv)
 281 {
 282         int err;
 283         pthread_t *tid_reader, *tid_writer;
 284         void *tret;
 285         unsigned long long tot_reads = 0, tot_writes = 0;
 286         int i, a;
 287
 288         if (argc < 4) {
 289                 show_usage(argc, argv);
 290                 return -1;
 291         }
 292         cmm_smp_mb();
 293
 294         err = sscanf(argv[1], "%u", &nr_readers);
 295         if (err != 1) {
 296                 show_usage(argc, argv);
 297                 return -1;
 298         }
 299
 300         err = sscanf(argv[2], "%u", &nr_writers);
 301         if (err != 1) {
 302                 show_usage(argc, argv);
 303                 return -1;
 304         }
 305
 306         err = sscanf(argv[3], "%lu", &duration);
 307         if (err != 1) {
 308                 show_usage(argc, argv);
 309                 return -1;
 310         }
 311
 312         for (i = 4; i < argc; i++) {
 313                 if (argv[i][0] != '-')
 314                         continue;
 315                 switch (argv[i][1]) {
 316 #ifdef DEBUG_YIELD
 317                 case 'r':
 318                         yield_active |= YIELD_READ;
 319                         break;
 320                 case 'w':
 321                         yield_active |= YIELD_WRITE;
 322                         break;
 323 #endif
 324                 case 'a':
 325                         if (argc < i + 2) {
 326                                 show_usage(argc, argv);
 327                                 return -1;
 328                         }
 329                         a = atoi(argv[++i]);
 330                         cpu_affinities[next_aff++] = a;
 331                         use_affinity = 1;
 332                         printf_verbose("Adding CPU %d affinity\n", a);
 333                         break;
 334                 case 'c':
 335                         if (argc < i + 2) {
 336                                 show_usage(argc, argv);
 337                                 return -1;
 338                         }
 339                         rduration = atol(argv[++i]);
 340                         break;
 341                 case 'd':
 342                         if (argc < i + 2) {
 343                                 show_usage(argc, argv);
 344                                 return -1;
 345                         }
 346                         wdelay = atol(argv[++i]);
 347                         break;
 348                 case 'e':
 349                         if (argc < i + 2) {
 350                                 show_usage(argc, argv);
 351                                 return -1;
 352                         }
 353                         wduration = atol(argv[++i]);
 354                         break;
 355                 case 'v':
 356                         verbose_mode = 1;
 357                         break;
 358                 }
 359         }
 360
 361         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 362                 duration, nr_readers, nr_writers);
 363         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 364         printf_verbose("Reader duration : %lu loops.\n", rduration);
 365         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 366                         "main", (unsigned long) pthread_self(), (unsigned long) gettid());
 367
 368         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 369         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 370         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 371         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 372         per_thread_lock = malloc(sizeof(*per_thread_lock) * nr_readers);
 373         for (i = 0; i < nr_readers; i++) {
 374                 err = pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 375                 if (err != 0)
 376                         exit(1);
 377         }
 378
 379         next_aff = 0;
 380
 381         for (i = 0; i < nr_readers; i++) {
 382                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 383                                      (void *)(long)i);
 384                 if (err != 0)
 385                         exit(1);
 386         }
 387         for (i = 0; i < nr_writers; i++) {
 388                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 389                                      (void *)(long)i);
 390                 if (err != 0)
 391                         exit(1);
 392         }
 393
 394         cmm_smp_mb();
 395
 396         test_go = 1;
 397
 398         sleep(duration);
 399
 400         test_stop = 1;
 401
 402         for (i = 0; i < nr_readers; i++) {
 403                 err = pthread_join(tid_reader[i], &tret);
 404                 if (err != 0)
 405                         exit(1);
 406                 tot_reads += tot_nr_reads[i];
 407         }
 408         for (i = 0; i < nr_writers; i++) {
 409                 err = pthread_join(tid_writer[i], &tret);
 410                 if (err != 0)
 411                         exit(1);
 412                 tot_writes += tot_nr_writes[i];
 413         }
 414
 415         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 416                tot_writes);
 417         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 418                 "nr_writers %3u "
 419                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 420                 argv[0], duration, nr_readers, rduration, wduration,
 421                 nr_writers, wdelay, tot_reads, tot_writes,
 422                 tot_reads + tot_writes);
 423
 424         free(tid_reader);
 425         free(tid_writer);
 426         free(tot_nr_reads);
 427         free(tot_nr_writes);
 428         free(per_thread_lock);
 429         return 0;
 430 }