| 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 | static pthread_mutex_t lock; |
| 68 | |
| 69 | static volatile int test_go, test_stop; |
| 70 | |
| 71 | static unsigned long wdelay; |
| 72 | |
| 73 | static volatile struct test_array test_array = { 8 }; |
| 74 | |
| 75 | static unsigned long duration; |
| 76 | |
| 77 | /* read-side C.S. duration, in loops */ |
| 78 | static unsigned long rduration; |
| 79 | |
| 80 | static inline void loop_sleep(unsigned long l) |
| 81 | { |
| 82 | while(l-- != 0) |
| 83 | cpu_relax(); |
| 84 | } |
| 85 | |
| 86 | static int verbose_mode; |
| 87 | |
| 88 | #define printf_verbose(fmt, args...) \ |
| 89 | do { \ |
| 90 | if (verbose_mode) \ |
| 91 | printf(fmt, args); \ |
| 92 | } while (0) |
| 93 | |
| 94 | /* |
| 95 | * returns 0 if test should end. |
| 96 | */ |
| 97 | static int test_duration_write(void) |
| 98 | { |
| 99 | return !test_stop; |
| 100 | } |
| 101 | |
| 102 | static int test_duration_read(void) |
| 103 | { |
| 104 | return !test_stop; |
| 105 | } |
| 106 | |
| 107 | static unsigned long long __thread nr_writes; |
| 108 | static unsigned long long __thread nr_reads; |
| 109 | |
| 110 | static |
| 111 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; |
| 112 | static |
| 113 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_reads; |
| 114 | |
| 115 | static unsigned int nr_readers; |
| 116 | static unsigned int nr_writers; |
| 117 | |
| 118 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 119 | |
| 120 | void rcu_copy_mutex_lock(void) |
| 121 | { |
| 122 | int ret; |
| 123 | ret = pthread_mutex_lock(&rcu_copy_mutex); |
| 124 | if (ret) { |
| 125 | perror("Error in pthread mutex lock"); |
| 126 | exit(-1); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | void rcu_copy_mutex_unlock(void) |
| 131 | { |
| 132 | int ret; |
| 133 | |
| 134 | ret = pthread_mutex_unlock(&rcu_copy_mutex); |
| 135 | if (ret) { |
| 136 | perror("Error in pthread mutex unlock"); |
| 137 | exit(-1); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | void *thr_reader(void *data) |
| 142 | { |
| 143 | unsigned long tidx = (unsigned long)data; |
| 144 | |
| 145 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
| 146 | "reader", pthread_self(), (unsigned long)gettid()); |
| 147 | |
| 148 | while (!test_go) |
| 149 | { |
| 150 | } |
| 151 | |
| 152 | for (;;) { |
| 153 | pthread_mutex_lock(&lock); |
| 154 | assert(test_array.a == 8); |
| 155 | if (unlikely(rduration)) |
| 156 | loop_sleep(rduration); |
| 157 | pthread_mutex_unlock(&lock); |
| 158 | nr_reads++; |
| 159 | if (unlikely(!test_duration_read())) |
| 160 | break; |
| 161 | } |
| 162 | |
| 163 | tot_nr_reads[tidx] = nr_reads; |
| 164 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
| 165 | "reader", pthread_self(), (unsigned long)gettid()); |
| 166 | return ((void*)1); |
| 167 | |
| 168 | } |
| 169 | |
| 170 | void *thr_writer(void *data) |
| 171 | { |
| 172 | unsigned long wtidx = (unsigned long)data; |
| 173 | |
| 174 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
| 175 | "writer", pthread_self(), (unsigned long)gettid()); |
| 176 | |
| 177 | while (!test_go) |
| 178 | { |
| 179 | } |
| 180 | smp_mb(); |
| 181 | |
| 182 | for (;;) { |
| 183 | pthread_mutex_lock(&lock); |
| 184 | test_array.a = 0; |
| 185 | test_array.a = 8; |
| 186 | pthread_mutex_unlock(&lock); |
| 187 | nr_writes++; |
| 188 | if (unlikely(!test_duration_write())) |
| 189 | break; |
| 190 | if (unlikely(wdelay)) |
| 191 | loop_sleep(wdelay); |
| 192 | } |
| 193 | |
| 194 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
| 195 | "writer", pthread_self(), (unsigned long)gettid()); |
| 196 | tot_nr_writes[wtidx] = nr_writes; |
| 197 | return ((void*)2); |
| 198 | } |
| 199 | |
| 200 | void show_usage(int argc, char **argv) |
| 201 | { |
| 202 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); |
| 203 | #ifdef DEBUG_YIELD |
| 204 | printf(" [-r] [-w] (yield reader and/or writer)"); |
| 205 | #endif |
| 206 | printf(" [-d delay] (writer period (us))"); |
| 207 | printf(" [-c duration] (reader C.S. duration (in loops))"); |
| 208 | printf(" [-v] (verbose output)"); |
| 209 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); |
| 210 | printf("\n"); |
| 211 | } |
| 212 | |
| 213 | cpu_set_t affinity; |
| 214 | |
| 215 | int main(int argc, char **argv) |
| 216 | { |
| 217 | int err; |
| 218 | pthread_t *tid_reader, *tid_writer; |
| 219 | void *tret; |
| 220 | unsigned long long *count_reader, *count_writer; |
| 221 | unsigned long long tot_reads = 0, tot_writes = 0; |
| 222 | int i, a; |
| 223 | int use_affinity = 0; |
| 224 | |
| 225 | if (argc < 4) { |
| 226 | show_usage(argc, argv); |
| 227 | return -1; |
| 228 | } |
| 229 | smp_mb(); |
| 230 | |
| 231 | err = sscanf(argv[1], "%u", &nr_readers); |
| 232 | if (err != 1) { |
| 233 | show_usage(argc, argv); |
| 234 | return -1; |
| 235 | } |
| 236 | |
| 237 | err = sscanf(argv[2], "%u", &nr_writers); |
| 238 | if (err != 1) { |
| 239 | show_usage(argc, argv); |
| 240 | return -1; |
| 241 | } |
| 242 | |
| 243 | err = sscanf(argv[3], "%lu", &duration); |
| 244 | if (err != 1) { |
| 245 | show_usage(argc, argv); |
| 246 | return -1; |
| 247 | } |
| 248 | |
| 249 | CPU_ZERO(&affinity); |
| 250 | |
| 251 | for (i = 4; i < argc; i++) { |
| 252 | if (argv[i][0] != '-') |
| 253 | continue; |
| 254 | switch (argv[i][1]) { |
| 255 | #ifdef DEBUG_YIELD |
| 256 | case 'r': |
| 257 | yield_active |= YIELD_READ; |
| 258 | break; |
| 259 | case 'w': |
| 260 | yield_active |= YIELD_WRITE; |
| 261 | break; |
| 262 | #endif |
| 263 | case 'a': |
| 264 | if (argc < i + 2) { |
| 265 | show_usage(argc, argv); |
| 266 | return -1; |
| 267 | } |
| 268 | a = atoi(argv[++i]); |
| 269 | CPU_SET(a, &affinity); |
| 270 | use_affinity = 1; |
| 271 | printf_verbose("Adding CPU %d affinity\n", a); |
| 272 | break; |
| 273 | case 'c': |
| 274 | if (argc < i + 2) { |
| 275 | show_usage(argc, argv); |
| 276 | return -1; |
| 277 | } |
| 278 | rduration = atol(argv[++i]); |
| 279 | break; |
| 280 | case 'd': |
| 281 | if (argc < i + 2) { |
| 282 | show_usage(argc, argv); |
| 283 | return -1; |
| 284 | } |
| 285 | wdelay = atol(argv[++i]); |
| 286 | break; |
| 287 | case 'v': |
| 288 | verbose_mode = 1; |
| 289 | break; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", |
| 294 | duration, nr_readers, nr_writers); |
| 295 | printf_verbose("Writer delay : %lu loops.\n", wdelay); |
| 296 | printf_verbose("Reader duration : %lu loops.\n", rduration); |
| 297 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", |
| 298 | "main", pthread_self(), (unsigned long)gettid()); |
| 299 | |
| 300 | if (use_affinity |
| 301 | && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) { |
| 302 | perror("sched_setaffinity"); |
| 303 | exit(-1); |
| 304 | } |
| 305 | |
| 306 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); |
| 307 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); |
| 308 | count_reader = malloc(sizeof(*count_reader) * nr_readers); |
| 309 | count_writer = malloc(sizeof(*count_writer) * nr_writers); |
| 310 | tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers); |
| 311 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); |
| 312 | |
| 313 | for (i = 0; i < nr_readers; i++) { |
| 314 | err = pthread_create(&tid_reader[i], NULL, thr_reader, |
| 315 | (void *)(long)i); |
| 316 | if (err != 0) |
| 317 | exit(1); |
| 318 | } |
| 319 | for (i = 0; i < nr_writers; i++) { |
| 320 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
| 321 | (void *)(long)i); |
| 322 | if (err != 0) |
| 323 | exit(1); |
| 324 | } |
| 325 | |
| 326 | smp_mb(); |
| 327 | |
| 328 | test_go = 1; |
| 329 | |
| 330 | sleep(duration); |
| 331 | |
| 332 | test_stop = 1; |
| 333 | |
| 334 | for (i = 0; i < nr_readers; i++) { |
| 335 | err = pthread_join(tid_reader[i], &tret); |
| 336 | if (err != 0) |
| 337 | exit(1); |
| 338 | tot_reads += tot_nr_reads[i]; |
| 339 | } |
| 340 | for (i = 0; i < nr_writers; i++) { |
| 341 | err = pthread_join(tid_writer[i], &tret); |
| 342 | if (err != 0) |
| 343 | exit(1); |
| 344 | tot_writes += tot_nr_writes[i]; |
| 345 | } |
| 346 | |
| 347 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, |
| 348 | tot_writes); |
| 349 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " |
| 350 | "nr_writers %3u " |
| 351 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", |
| 352 | argv[0], duration, nr_readers, rduration, |
| 353 | nr_writers, wdelay, tot_reads, tot_writes, |
| 354 | tot_reads + tot_writes); |
| 355 | |
| 356 | free(tid_reader); |
| 357 | free(tid_writer); |
| 358 | free(count_reader); |
| 359 | free(count_writer); |
| 360 | free(tot_nr_reads); |
| 361 | free(tot_nr_writes); |
| 362 | return 0; |
| 363 | } |