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cb8818f0 MD |
1 | /* |
2 | * test_urcu_lfs_rcu.c | |
3 | * | |
4 | * Userspace RCU library - example RCU-based lock-free stack | |
5 | * | |
6 | * Copyright February 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
7 | * Copyright February 2010 - Paolo Bonzini <pbonzini@redhat.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
22 | */ | |
23 | ||
24 | #define _GNU_SOURCE | |
f5ab766e | 25 | #include "config.h" |
cb8818f0 MD |
26 | #include <stdio.h> |
27 | #include <pthread.h> | |
28 | #include <stdlib.h> | |
29 | #include <stdint.h> | |
30 | #include <stdbool.h> | |
31 | #include <string.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/wait.h> | |
34 | #include <unistd.h> | |
35 | #include <stdio.h> | |
36 | #include <assert.h> | |
cb8818f0 MD |
37 | #include <errno.h> |
38 | ||
39 | #include <urcu/arch.h> | |
40 | #include <urcu/tls-compat.h> | |
2953b501 | 41 | #include "cpuset.h" |
94df6318 | 42 | #include "thread-id.h" |
cb8818f0 MD |
43 | |
44 | /* hardcoded number of CPUs */ | |
45 | #define NR_CPUS 16384 | |
46 | ||
cb8818f0 MD |
47 | #ifndef DYNAMIC_LINK_TEST |
48 | #define _LGPL_SOURCE | |
49 | #endif | |
50 | #include <urcu.h> | |
d89ec762 MD |
51 | |
52 | /* Remove deprecation warnings from test build. */ | |
53 | #define CDS_LFS_RCU_DEPRECATED | |
54 | ||
cb8818f0 MD |
55 | #include <urcu/cds.h> |
56 | ||
57 | static volatile int test_go, test_stop; | |
58 | ||
59 | static unsigned long rduration; | |
60 | ||
61 | static unsigned long duration; | |
62 | ||
63 | /* read-side C.S. duration, in loops */ | |
64 | static unsigned long wdelay; | |
65 | ||
66 | static inline void loop_sleep(unsigned long loops) | |
67 | { | |
68 | while (loops-- != 0) | |
69 | caa_cpu_relax(); | |
70 | } | |
71 | ||
72 | static int verbose_mode; | |
73 | ||
74 | #define printf_verbose(fmt, args...) \ | |
75 | do { \ | |
76 | if (verbose_mode) \ | |
77 | printf(fmt, args); \ | |
78 | } while (0) | |
79 | ||
80 | static unsigned int cpu_affinities[NR_CPUS]; | |
81 | static unsigned int next_aff = 0; | |
82 | static int use_affinity = 0; | |
83 | ||
84 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; | |
85 | ||
cb8818f0 MD |
86 | static void set_affinity(void) |
87 | { | |
88 | cpu_set_t mask; | |
89 | int cpu; | |
90 | int ret; | |
91 | ||
92 | if (!use_affinity) | |
93 | return; | |
94 | ||
95 | #if HAVE_SCHED_SETAFFINITY | |
96 | ret = pthread_mutex_lock(&affinity_mutex); | |
97 | if (ret) { | |
98 | perror("Error in pthread mutex lock"); | |
99 | exit(-1); | |
100 | } | |
101 | cpu = cpu_affinities[next_aff++]; | |
102 | ret = pthread_mutex_unlock(&affinity_mutex); | |
103 | if (ret) { | |
104 | perror("Error in pthread mutex unlock"); | |
105 | exit(-1); | |
106 | } | |
107 | ||
108 | CPU_ZERO(&mask); | |
109 | CPU_SET(cpu, &mask); | |
110 | #if SCHED_SETAFFINITY_ARGS == 2 | |
111 | sched_setaffinity(0, &mask); | |
112 | #else | |
113 | sched_setaffinity(0, sizeof(mask), &mask); | |
114 | #endif | |
115 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
116 | } | |
117 | ||
118 | /* | |
119 | * returns 0 if test should end. | |
120 | */ | |
121 | static int test_duration_dequeue(void) | |
122 | { | |
123 | return !test_stop; | |
124 | } | |
125 | ||
126 | static int test_duration_enqueue(void) | |
127 | { | |
128 | return !test_stop; | |
129 | } | |
130 | ||
131 | static DEFINE_URCU_TLS(unsigned long long, nr_dequeues); | |
132 | static DEFINE_URCU_TLS(unsigned long long, nr_enqueues); | |
133 | ||
134 | static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues); | |
135 | static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues); | |
136 | ||
137 | static unsigned int nr_enqueuers; | |
138 | static unsigned int nr_dequeuers; | |
139 | ||
140 | struct test { | |
141 | struct cds_lfs_node_rcu list; | |
142 | struct rcu_head rcu; | |
143 | }; | |
144 | ||
145 | static struct cds_lfs_stack_rcu s; | |
146 | ||
147 | void *thr_enqueuer(void *_count) | |
148 | { | |
149 | unsigned long long *count = _count; | |
150 | ||
94df6318 MD |
151 | printf_verbose("thread_begin %s, tid %lu\n", |
152 | "enqueuer", urcu_get_thread_id()); | |
cb8818f0 MD |
153 | |
154 | set_affinity(); | |
155 | ||
156 | rcu_register_thread(); | |
157 | ||
158 | while (!test_go) | |
159 | { | |
160 | } | |
161 | cmm_smp_mb(); | |
162 | ||
163 | for (;;) { | |
164 | struct test *node = malloc(sizeof(*node)); | |
165 | if (!node) | |
166 | goto fail; | |
167 | cds_lfs_node_init_rcu(&node->list); | |
168 | /* No rcu read-side is needed for push */ | |
169 | cds_lfs_push_rcu(&s, &node->list); | |
170 | URCU_TLS(nr_successful_enqueues)++; | |
171 | ||
172 | if (caa_unlikely(wdelay)) | |
173 | loop_sleep(wdelay); | |
174 | fail: | |
175 | URCU_TLS(nr_enqueues)++; | |
176 | if (caa_unlikely(!test_duration_enqueue())) | |
177 | break; | |
178 | } | |
179 | ||
180 | rcu_unregister_thread(); | |
181 | ||
182 | count[0] = URCU_TLS(nr_enqueues); | |
183 | count[1] = URCU_TLS(nr_successful_enqueues); | |
94df6318 MD |
184 | printf_verbose("enqueuer thread_end, tid %lu, " |
185 | "enqueues %llu successful_enqueues %llu\n", | |
186 | urcu_get_thread_id(), | |
187 | URCU_TLS(nr_enqueues), | |
188 | URCU_TLS(nr_successful_enqueues)); | |
cb8818f0 MD |
189 | return ((void*)1); |
190 | ||
191 | } | |
192 | ||
193 | static | |
194 | void free_node_cb(struct rcu_head *head) | |
195 | { | |
196 | struct test *node = | |
197 | caa_container_of(head, struct test, rcu); | |
198 | free(node); | |
199 | } | |
200 | ||
201 | void *thr_dequeuer(void *_count) | |
202 | { | |
203 | unsigned long long *count = _count; | |
204 | ||
94df6318 MD |
205 | printf_verbose("thread_begin %s, tid %lu\n", |
206 | "dequeuer", urcu_get_thread_id()); | |
cb8818f0 MD |
207 | |
208 | set_affinity(); | |
209 | ||
210 | rcu_register_thread(); | |
211 | ||
212 | while (!test_go) | |
213 | { | |
214 | } | |
215 | cmm_smp_mb(); | |
216 | ||
217 | for (;;) { | |
218 | struct cds_lfs_node_rcu *snode; | |
219 | ||
220 | rcu_read_lock(); | |
221 | snode = cds_lfs_pop_rcu(&s); | |
222 | rcu_read_unlock(); | |
223 | if (snode) { | |
224 | struct test *node; | |
225 | ||
226 | node = caa_container_of(snode, struct test, list); | |
227 | call_rcu(&node->rcu, free_node_cb); | |
228 | URCU_TLS(nr_successful_dequeues)++; | |
229 | } | |
230 | URCU_TLS(nr_dequeues)++; | |
231 | if (caa_unlikely(!test_duration_dequeue())) | |
232 | break; | |
233 | if (caa_unlikely(rduration)) | |
234 | loop_sleep(rduration); | |
235 | } | |
236 | ||
237 | rcu_unregister_thread(); | |
238 | ||
94df6318 MD |
239 | printf_verbose("dequeuer thread_end, tid %lu, " |
240 | "dequeues %llu, successful_dequeues %llu\n", | |
241 | urcu_get_thread_id(), | |
242 | URCU_TLS(nr_dequeues), | |
243 | URCU_TLS(nr_successful_dequeues)); | |
cb8818f0 MD |
244 | count[0] = URCU_TLS(nr_dequeues); |
245 | count[1] = URCU_TLS(nr_successful_dequeues); | |
246 | return ((void*)2); | |
247 | } | |
248 | ||
249 | void test_end(struct cds_lfs_stack_rcu *s, unsigned long long *nr_dequeues) | |
250 | { | |
251 | struct cds_lfs_node_rcu *snode; | |
252 | ||
253 | do { | |
254 | snode = cds_lfs_pop_rcu(s); | |
255 | if (snode) { | |
256 | struct test *node; | |
257 | ||
258 | node = caa_container_of(snode, struct test, list); | |
259 | free(node); | |
260 | (*nr_dequeues)++; | |
261 | } | |
262 | } while (snode); | |
263 | } | |
264 | ||
265 | void show_usage(int argc, char **argv) | |
266 | { | |
06637138 MD |
267 | printf("Usage : %s nr_dequeuers nr_enqueuers duration (s) <OPTIONS>\n", |
268 | argv[0]); | |
269 | printf("OPTIONS:\n"); | |
270 | printf(" [-d delay] (enqueuer period (in loops))\n"); | |
271 | printf(" [-c duration] (dequeuer period (in loops))\n"); | |
272 | printf(" [-v] (verbose output)\n"); | |
273 | printf(" [-a cpu#] [-a cpu#]... (affinity)\n"); | |
cb8818f0 MD |
274 | printf("\n"); |
275 | } | |
276 | ||
277 | int main(int argc, char **argv) | |
278 | { | |
279 | int err; | |
280 | pthread_t *tid_enqueuer, *tid_dequeuer; | |
281 | void *tret; | |
282 | unsigned long long *count_enqueuer, *count_dequeuer; | |
283 | unsigned long long tot_enqueues = 0, tot_dequeues = 0; | |
284 | unsigned long long tot_successful_enqueues = 0, | |
285 | tot_successful_dequeues = 0; | |
286 | unsigned long long end_dequeues = 0; | |
287 | int i, a; | |
288 | ||
289 | if (argc < 4) { | |
290 | show_usage(argc, argv); | |
291 | return -1; | |
292 | } | |
293 | ||
294 | err = sscanf(argv[1], "%u", &nr_dequeuers); | |
295 | if (err != 1) { | |
296 | show_usage(argc, argv); | |
297 | return -1; | |
298 | } | |
299 | ||
300 | err = sscanf(argv[2], "%u", &nr_enqueuers); | |
301 | if (err != 1) { | |
302 | show_usage(argc, argv); | |
303 | return -1; | |
304 | } | |
305 | ||
306 | err = sscanf(argv[3], "%lu", &duration); | |
307 | if (err != 1) { | |
308 | show_usage(argc, argv); | |
309 | return -1; | |
310 | } | |
311 | ||
312 | for (i = 4; i < argc; i++) { | |
313 | if (argv[i][0] != '-') | |
314 | continue; | |
315 | switch (argv[i][1]) { | |
316 | case 'a': | |
317 | if (argc < i + 2) { | |
318 | show_usage(argc, argv); | |
319 | return -1; | |
320 | } | |
321 | a = atoi(argv[++i]); | |
322 | cpu_affinities[next_aff++] = a; | |
323 | use_affinity = 1; | |
324 | printf_verbose("Adding CPU %d affinity\n", a); | |
325 | break; | |
326 | case 'c': | |
327 | if (argc < i + 2) { | |
328 | show_usage(argc, argv); | |
329 | return -1; | |
330 | } | |
331 | rduration = atol(argv[++i]); | |
332 | break; | |
333 | case 'd': | |
334 | if (argc < i + 2) { | |
335 | show_usage(argc, argv); | |
336 | return -1; | |
337 | } | |
338 | wdelay = atol(argv[++i]); | |
339 | break; | |
340 | case 'v': | |
341 | verbose_mode = 1; | |
342 | break; | |
343 | } | |
344 | } | |
345 | ||
346 | printf_verbose("running test for %lu seconds, %u enqueuers, " | |
347 | "%u dequeuers.\n", | |
348 | duration, nr_enqueuers, nr_dequeuers); | |
349 | printf_verbose("Writer delay : %lu loops.\n", rduration); | |
350 | printf_verbose("Reader duration : %lu loops.\n", wdelay); | |
94df6318 MD |
351 | printf_verbose("thread %-6s, tid %lu\n", |
352 | "main", urcu_get_thread_id()); | |
cb8818f0 | 353 | |
9aa14175 MD |
354 | tid_enqueuer = calloc(nr_enqueuers, sizeof(*tid_enqueuer)); |
355 | tid_dequeuer = calloc(nr_dequeuers, sizeof(*tid_dequeuer)); | |
356 | count_enqueuer = calloc(nr_enqueuers, 2 * sizeof(*count_enqueuer)); | |
357 | count_dequeuer = calloc(nr_dequeuers, 2 * sizeof(*count_dequeuer)); | |
cb8818f0 MD |
358 | cds_lfs_init_rcu(&s); |
359 | err = create_all_cpu_call_rcu_data(0); | |
360 | if (err) { | |
361 | printf("Per-CPU call_rcu() worker threads unavailable. Using default global worker thread.\n"); | |
362 | } | |
363 | ||
364 | next_aff = 0; | |
365 | ||
366 | for (i = 0; i < nr_enqueuers; i++) { | |
367 | err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer, | |
368 | &count_enqueuer[2 * i]); | |
369 | if (err != 0) | |
370 | exit(1); | |
371 | } | |
372 | for (i = 0; i < nr_dequeuers; i++) { | |
373 | err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer, | |
374 | &count_dequeuer[2 * i]); | |
375 | if (err != 0) | |
376 | exit(1); | |
377 | } | |
378 | ||
379 | cmm_smp_mb(); | |
380 | ||
381 | test_go = 1; | |
382 | ||
383 | for (i = 0; i < duration; i++) { | |
384 | sleep(1); | |
385 | if (verbose_mode) | |
386 | write (1, ".", 1); | |
387 | } | |
388 | ||
389 | test_stop = 1; | |
390 | ||
391 | for (i = 0; i < nr_enqueuers; i++) { | |
392 | err = pthread_join(tid_enqueuer[i], &tret); | |
393 | if (err != 0) | |
394 | exit(1); | |
395 | tot_enqueues += count_enqueuer[2 * i]; | |
396 | tot_successful_enqueues += count_enqueuer[2 * i + 1]; | |
397 | } | |
398 | for (i = 0; i < nr_dequeuers; i++) { | |
399 | err = pthread_join(tid_dequeuer[i], &tret); | |
400 | if (err != 0) | |
401 | exit(1); | |
402 | tot_dequeues += count_dequeuer[2 * i]; | |
403 | tot_successful_dequeues += count_dequeuer[2 * i + 1]; | |
404 | } | |
405 | ||
406 | test_end(&s, &end_dequeues); | |
407 | ||
408 | printf_verbose("total number of enqueues : %llu, dequeues %llu\n", | |
409 | tot_enqueues, tot_dequeues); | |
410 | printf_verbose("total number of successful enqueues : %llu, " | |
411 | "successful dequeues %llu\n", | |
412 | tot_successful_enqueues, tot_successful_dequeues); | |
413 | printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu " | |
414 | "nr_dequeuers %3u " | |
415 | "rdur %6lu nr_enqueues %12llu nr_dequeues %12llu " | |
416 | "successful enqueues %12llu successful dequeues %12llu " | |
417 | "end_dequeues %llu nr_ops %12llu\n", | |
418 | argv[0], duration, nr_enqueuers, wdelay, | |
419 | nr_dequeuers, rduration, tot_enqueues, tot_dequeues, | |
420 | tot_successful_enqueues, | |
421 | tot_successful_dequeues, end_dequeues, | |
422 | tot_enqueues + tot_dequeues); | |
423 | if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues) | |
424 | printf("WARNING! Discrepancy between nr succ. enqueues %llu vs " | |
425 | "succ. dequeues + end dequeues %llu.\n", | |
426 | tot_successful_enqueues, | |
427 | tot_successful_dequeues + end_dequeues); | |
428 | ||
429 | free_all_cpu_call_rcu_data(); | |
430 | free(count_enqueuer); | |
431 | free(count_dequeuer); | |
432 | free(tid_enqueuer); | |
433 | free(tid_dequeuer); | |
434 | return 0; | |
435 | } |