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