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