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@polymtl.ca>
   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 <stdio.h>
  25 #include <pthread.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #include <sys/wait.h>
  30 #include <unistd.h>
  31 #include <stdio.h>
  32 #include <assert.h>
  33 #include <sys/syscall.h>
  34 #include <sched.h>
  35
  36 #include "../arch.h"
  37
  38 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
  39 #define CACHE_LINE_SIZE 4096
  40
  41 /* hardcoded number of CPUs */
  42 #define NR_CPUS 16384
  43
  44 #if defined(_syscall0)
  45 _syscall0(pid_t, gettid)
  46 #elif defined(__NR_gettid)
  47 static inline pid_t gettid(void)
  48 {
  49         return syscall(__NR_gettid);
  50 }
  51 #else
  52 #warning "use pid as tid"
  53 static inline pid_t gettid(void)
  54 {
  55         return getpid();
  56 }
  57 #endif
  58
  59 #ifndef DYNAMIC_LINK_TEST
  60 #define _LGPL_SOURCE
  61 #else
  62 #define debug_yield_read()
  63 #endif
  64 #include "../urcu.h"
  65
  66 struct test_array {
  67         int a;
  68 };
  69
  70 struct per_thread_lock {
  71         pthread_mutex_t lock;
  72 } __attribute__((aligned(CACHE_LINE_SIZE)));    /* cache-line aligned */
  73
  74 static struct per_thread_lock *per_thread_lock;
  75
  76 static volatile int test_go, test_stop;
  77
  78 static unsigned long wdelay;
  79
  80 static volatile struct test_array test_array = { 8 };
  81
  82 static unsigned long duration;
  83
  84 /* read-side C.S. duration, in loops */
  85 static unsigned long rduration;
  86
  87 static inline void loop_sleep(unsigned long l)
  88 {
  89         while(l-- != 0)
  90                 cpu_relax();
  91 }
  92
  93 static int verbose_mode;
  94
  95 #define printf_verbose(fmt, args...)            \
  96         do {                                    \
  97                 if (verbose_mode)               \
  98                         printf(fmt, args);      \
  99         } while (0)
 100
 101 static unsigned int cpu_affinities[NR_CPUS];
 102 static unsigned int next_aff = 0;
 103 static int use_affinity = 0;
 104
 105 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
 106
 107 static void set_affinity(void)
 108 {
 109         cpu_set_t mask;
 110         int cpu;
 111         int ret;
 112
 113         if (!use_affinity)
 114                 return;
 115
 116         ret = pthread_mutex_lock(&affinity_mutex);
 117         if (ret) {
 118                 perror("Error in pthread mutex lock");
 119                 exit(-1);
 120         }
 121         cpu = cpu_affinities[next_aff++];
 122         ret = pthread_mutex_unlock(&affinity_mutex);
 123         if (ret) {
 124                 perror("Error in pthread mutex unlock");
 125                 exit(-1);
 126         }
 127         CPU_ZERO(&mask);
 128         CPU_SET(cpu, &mask);
 129         sched_setaffinity(0, sizeof(mask), &mask);
 130 }
 131
 132 /*
 133  * returns 0 if test should end.
 134  */
 135 static int test_duration_write(void)
 136 {
 137         return !test_stop;
 138 }
 139
 140 static int test_duration_read(void)
 141 {
 142         return !test_stop;
 143 }
 144
 145 static unsigned long long __thread nr_writes;
 146 static unsigned long long __thread nr_reads;
 147
 148 static
 149 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes;
 150 static
 151 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_reads;
 152
 153 static unsigned int nr_readers;
 154 static unsigned int nr_writers;
 155
 156 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 157
 158 void rcu_copy_mutex_lock(void)
 159 {
 160         int ret;
 161         ret = pthread_mutex_lock(&rcu_copy_mutex);
 162         if (ret) {
 163                 perror("Error in pthread mutex lock");
 164                 exit(-1);
 165         }
 166 }
 167
 168 void rcu_copy_mutex_unlock(void)
 169 {
 170         int ret;
 171
 172         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 173         if (ret) {
 174                 perror("Error in pthread mutex unlock");
 175                 exit(-1);
 176         }
 177 }
 178
 179 void *thr_reader(void *data)
 180 {
 181         unsigned long tidx = (unsigned long)data;
 182
 183         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 184                         "reader", pthread_self(), (unsigned long)gettid());
 185
 186         set_affinity();
 187
 188         while (!test_go)
 189         {
 190         }
 191
 192         for (;;) {
 193                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 194                 assert(test_array.a == 8);
 195                 if (unlikely(rduration))
 196                         loop_sleep(rduration);
 197                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 198                 nr_reads++;
 199                 if (unlikely(!test_duration_read()))
 200                         break;
 201         }
 202
 203         tot_nr_reads[tidx] = nr_reads;
 204         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 205                         "reader", pthread_self(), (unsigned long)gettid());
 206         return ((void*)1);
 207
 208 }
 209
 210 void *thr_writer(void *data)
 211 {
 212         unsigned long wtidx = (unsigned long)data;
 213         long tidx;
 214
 215         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 216                         "writer", pthread_self(), (unsigned long)gettid());
 217
 218         set_affinity();
 219
 220         while (!test_go)
 221         {
 222         }
 223         smp_mb();
 224
 225         for (;;) {
 226                 for (tidx = 0; tidx < nr_readers; tidx++) {
 227                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 228                 }
 229                 test_array.a = 0;
 230                 test_array.a = 8;
 231                 for (tidx = (long)nr_readers - 1; tidx >= 0; tidx--) {
 232                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 233                 }
 234                 nr_writes++;
 235                 if (unlikely(!test_duration_write()))
 236                         break;
 237                 if (unlikely(wdelay))
 238                         loop_sleep(wdelay);
 239         }
 240
 241         printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
 242                         "writer", pthread_self(), (unsigned long)gettid());
 243         tot_nr_writes[wtidx] = nr_writes;
 244         return ((void*)2);
 245 }
 246
 247 void show_usage(int argc, char **argv)
 248 {
 249         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 250 #ifdef DEBUG_YIELD
 251         printf(" [-r] [-w] (yield reader and/or writer)");
 252 #endif
 253         printf(" [-d delay] (writer period (us))");
 254         printf(" [-c duration] (reader C.S. duration (in loops))");
 255         printf(" [-v] (verbose output)");
 256         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 257         printf("\n");
 258 }
 259
 260 int main(int argc, char **argv)
 261 {
 262         int err;
 263         pthread_t *tid_reader, *tid_writer;
 264         void *tret;
 265         unsigned long long *count_reader, *count_writer;
 266         unsigned long long tot_reads = 0, tot_writes = 0;
 267         int i, a;
 268
 269         if (argc < 4) {
 270                 show_usage(argc, argv);
 271                 return -1;
 272         }
 273         smp_mb();
 274
 275         err = sscanf(argv[1], "%u", &nr_readers);
 276         if (err != 1) {
 277                 show_usage(argc, argv);
 278                 return -1;
 279         }
 280
 281         err = sscanf(argv[2], "%u", &nr_writers);
 282         if (err != 1) {
 283                 show_usage(argc, argv);
 284                 return -1;
 285         }
 286
 287         err = sscanf(argv[3], "%lu", &duration);
 288         if (err != 1) {
 289                 show_usage(argc, argv);
 290                 return -1;
 291         }
 292
 293         for (i = 4; i < argc; i++) {
 294                 if (argv[i][0] != '-')
 295                         continue;
 296                 switch (argv[i][1]) {
 297 #ifdef DEBUG_YIELD
 298                 case 'r':
 299                         yield_active |= YIELD_READ;
 300                         break;
 301                 case 'w':
 302                         yield_active |= YIELD_WRITE;
 303                         break;
 304 #endif
 305                 case 'a':
 306                         if (argc < i + 2) {
 307                                 show_usage(argc, argv);
 308                                 return -1;
 309                         }
 310                         a = atoi(argv[++i]);
 311                         cpu_affinities[next_aff++] = a;
 312                         use_affinity = 1;
 313                         printf_verbose("Adding CPU %d affinity\n", a);
 314                         break;
 315                 case 'c':
 316                         if (argc < i + 2) {
 317                                 show_usage(argc, argv);
 318                                 return -1;
 319                         }
 320                         rduration = atol(argv[++i]);
 321                         break;
 322                 case 'd':
 323                         if (argc < i + 2) {
 324                                 show_usage(argc, argv);
 325                                 return -1;
 326                         }
 327                         wdelay = atol(argv[++i]);
 328                         break;
 329                 case 'v':
 330                         verbose_mode = 1;
 331                         break;
 332                 }
 333         }
 334
 335         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 336                 duration, nr_readers, nr_writers);
 337         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 338         printf_verbose("Reader duration : %lu loops.\n", rduration);
 339         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 340                         "main", pthread_self(), (unsigned long)gettid());
 341
 342         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 343         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 344         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 345         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 346         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 347         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 348         per_thread_lock = malloc(sizeof(*per_thread_lock) * nr_readers);
 349
 350         next_aff = 0;
 351
 352         for (i = 0; i < nr_readers; i++) {
 353                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 354                                      (void *)(long)i);
 355                 if (err != 0)
 356                         exit(1);
 357         }
 358         for (i = 0; i < nr_writers; i++) {
 359                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 360                                      (void *)(long)i);
 361                 if (err != 0)
 362                         exit(1);
 363         }
 364
 365         smp_mb();
 366
 367         test_go = 1;
 368
 369         sleep(duration);
 370
 371         test_stop = 1;
 372
 373         for (i = 0; i < nr_readers; i++) {
 374                 err = pthread_join(tid_reader[i], &tret);
 375                 if (err != 0)
 376                         exit(1);
 377                 tot_reads += tot_nr_reads[i];
 378         }
 379         for (i = 0; i < nr_writers; i++) {
 380                 err = pthread_join(tid_writer[i], &tret);
 381                 if (err != 0)
 382                         exit(1);
 383                 tot_writes += tot_nr_writes[i];
 384         }
 385
 386         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 387                tot_writes);
 388         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
 389                 "nr_writers %3u "
 390                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 391                 argv[0], duration, nr_readers, rduration,
 392                 nr_writers, wdelay, tot_reads, tot_writes,
 393                 tot_reads + tot_writes);
 394
 395         free(tid_reader);
 396         free(tid_writer);
 397         free(count_reader);
 398         free(count_writer);
 399         free(tot_nr_reads);
 400         free(tot_nr_writes);
 401         free(per_thread_lock);
 402         return 0;
 403 }