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