27648786bd27eb77ec974d245f39cf5abd8b4620
[urcu.git] / tests / test_urcu.c
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 rcu_debug_yield_read()
48 #endif
49 #include <urcu.h>
50
51 static volatile int test_go, test_stop;
52
53 static unsigned long wdelay;
54
55 static int *test_rcu_pointer;
56
57 static unsigned long duration;
58
59 /* read-side C.S. duration, in loops */
60 static unsigned long rduration;
61
62 /* write-side C.S. duration, in loops */
63 static unsigned long wduration;
64
65 static inline void loop_sleep(unsigned long loops)
66 {
67 while (loops-- != 0)
68 caa_cpu_relax();
69 }
70
71 static int verbose_mode;
72
73 #define printf_verbose(fmt, args...) \
74 do { \
75 if (verbose_mode) \
76 printf(fmt, args); \
77 } while (0)
78
79 static unsigned int cpu_affinities[NR_CPUS];
80 static unsigned int next_aff = 0;
81 static int use_affinity = 0;
82
83 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
84
85 static void set_affinity(void)
86 {
87 #if HAVE_SCHED_SETAFFINITY
88 cpu_set_t mask;
89 int cpu, ret;
90 #endif /* HAVE_SCHED_SETAFFINITY */
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_write(void)
122 {
123 return !test_stop;
124 }
125
126 static int test_duration_read(void)
127 {
128 return !test_stop;
129 }
130
131 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
132 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
133
134 static unsigned int nr_readers;
135 static unsigned int nr_writers;
136
137 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
138
139 void rcu_copy_mutex_lock(void)
140 {
141 int ret;
142 ret = pthread_mutex_lock(&rcu_copy_mutex);
143 if (ret) {
144 perror("Error in pthread mutex lock");
145 exit(-1);
146 }
147 }
148
149 void rcu_copy_mutex_unlock(void)
150 {
151 int ret;
152
153 ret = pthread_mutex_unlock(&rcu_copy_mutex);
154 if (ret) {
155 perror("Error in pthread mutex unlock");
156 exit(-1);
157 }
158 }
159
160 void *thr_reader(void *_count)
161 {
162 unsigned long long *count = _count;
163 int *local_ptr;
164
165 printf_verbose("thread_begin %s, tid %lu\n",
166 "reader", urcu_get_thread_id());
167
168 set_affinity();
169
170 rcu_register_thread();
171 assert(!rcu_read_ongoing());
172
173 while (!test_go)
174 {
175 }
176 cmm_smp_mb();
177
178 for (;;) {
179 rcu_read_lock();
180 assert(rcu_read_ongoing());
181 local_ptr = rcu_dereference(test_rcu_pointer);
182 rcu_debug_yield_read();
183 if (local_ptr)
184 assert(*local_ptr == 8);
185 if (caa_unlikely(rduration))
186 loop_sleep(rduration);
187 rcu_read_unlock();
188 URCU_TLS(nr_reads)++;
189 if (caa_unlikely(!test_duration_read()))
190 break;
191 }
192
193 rcu_unregister_thread();
194
195 /* test extra thread registration */
196 rcu_register_thread();
197 rcu_unregister_thread();
198
199 *count = URCU_TLS(nr_reads);
200 printf_verbose("thread_end %s, tid %lu\n",
201 "reader", urcu_get_thread_id());
202 return ((void*)1);
203
204 }
205
206 void *thr_writer(void *_count)
207 {
208 unsigned long long *count = _count;
209 int *new, *old;
210
211 printf_verbose("thread_begin %s, tid %lu\n",
212 "writer", urcu_get_thread_id());
213
214 set_affinity();
215
216 while (!test_go)
217 {
218 }
219 cmm_smp_mb();
220
221 for (;;) {
222 new = malloc(sizeof(int));
223 assert(new);
224 *new = 8;
225 old = rcu_xchg_pointer(&test_rcu_pointer, new);
226 if (caa_unlikely(wduration))
227 loop_sleep(wduration);
228 synchronize_rcu();
229 if (old)
230 *old = 0;
231 free(old);
232 URCU_TLS(nr_writes)++;
233 if (caa_unlikely(!test_duration_write()))
234 break;
235 if (caa_unlikely(wdelay))
236 loop_sleep(wdelay);
237 }
238
239 printf_verbose("thread_end %s, tid %lu\n",
240 "writer", urcu_get_thread_id());
241 *count = URCU_TLS(nr_writes);
242 return ((void*)2);
243 }
244
245 void show_usage(int argc, char **argv)
246 {
247 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
248 argv[0]);
249 printf("OPTIONS:\n");
250 #ifdef DEBUG_YIELD
251 printf(" [-r] [-w] (yield reader and/or writer)\n");
252 #endif
253 printf(" [-d delay] (writer period (us))\n");
254 printf(" [-c duration] (reader C.S. duration (in loops))\n");
255 printf(" [-e duration] (writer C.S. duration (in loops))\n");
256 printf(" [-v] (verbose output)\n");
257 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
258 printf("\n");
259 }
260
261 int main(int argc, char **argv)
262 {
263 int err;
264 pthread_t *tid_reader, *tid_writer;
265 void *tret;
266 unsigned long long *count_reader, *count_writer;
267 unsigned long long tot_reads = 0, tot_writes = 0;
268 int i, a;
269
270 if (argc < 4) {
271 show_usage(argc, argv);
272 return -1;
273 }
274
275 err = sscanf(argv[1], "%u", &nr_readers);
276 if (err != 1) {
277 show_usage(argc, argv);
278 return -1;
279 }
280
281 err = sscanf(argv[2], "%u", &nr_writers);
282 if (err != 1) {
283 show_usage(argc, argv);
284 return -1;
285 }
286
287 err = sscanf(argv[3], "%lu", &duration);
288 if (err != 1) {
289 show_usage(argc, argv);
290 return -1;
291 }
292
293 for (i = 4; i < argc; i++) {
294 if (argv[i][0] != '-')
295 continue;
296 switch (argv[i][1]) {
297 #ifdef DEBUG_YIELD
298 case 'r':
299 rcu_yield_active |= RCU_YIELD_READ;
300 break;
301 case 'w':
302 rcu_yield_active |= RCU_YIELD_WRITE;
303 break;
304 #endif
305 case 'a':
306 if (argc < i + 2) {
307 show_usage(argc, argv);
308 return -1;
309 }
310 a = atoi(argv[++i]);
311 cpu_affinities[next_aff++] = a;
312 use_affinity = 1;
313 printf_verbose("Adding CPU %d affinity\n", a);
314 break;
315 case 'c':
316 if (argc < i + 2) {
317 show_usage(argc, argv);
318 return -1;
319 }
320 rduration = atol(argv[++i]);
321 break;
322 case 'd':
323 if (argc < i + 2) {
324 show_usage(argc, argv);
325 return -1;
326 }
327 wdelay = atol(argv[++i]);
328 break;
329 case 'e':
330 if (argc < i + 2) {
331 show_usage(argc, argv);
332 return -1;
333 }
334 wduration = atol(argv[++i]);
335 break;
336 case 'v':
337 verbose_mode = 1;
338 break;
339 }
340 }
341
342 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
343 duration, nr_readers, nr_writers);
344 printf_verbose("Writer delay : %lu loops.\n", wdelay);
345 printf_verbose("Reader duration : %lu loops.\n", rduration);
346 printf_verbose("thread %-6s, tid %lu\n",
347 "main", urcu_get_thread_id());
348
349 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
350 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
351 count_reader = calloc(nr_readers, sizeof(*count_reader));
352 count_writer = calloc(nr_writers, sizeof(*count_writer));
353
354 next_aff = 0;
355
356 for (i = 0; i < nr_readers; i++) {
357 err = pthread_create(&tid_reader[i], NULL, thr_reader,
358 &count_reader[i]);
359 if (err != 0)
360 exit(1);
361 }
362 for (i = 0; i < nr_writers; i++) {
363 err = pthread_create(&tid_writer[i], NULL, thr_writer,
364 &count_writer[i]);
365 if (err != 0)
366 exit(1);
367 }
368
369 cmm_smp_mb();
370
371 test_go = 1;
372
373 sleep(duration);
374
375 test_stop = 1;
376
377 for (i = 0; i < nr_readers; i++) {
378 err = pthread_join(tid_reader[i], &tret);
379 if (err != 0)
380 exit(1);
381 tot_reads += count_reader[i];
382 }
383 for (i = 0; i < nr_writers; i++) {
384 err = pthread_join(tid_writer[i], &tret);
385 if (err != 0)
386 exit(1);
387 tot_writes += count_writer[i];
388 }
389
390 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
391 tot_writes);
392 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
393 "nr_writers %3u "
394 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
395 argv[0], duration, nr_readers, rduration, wduration,
396 nr_writers, wdelay, tot_reads, tot_writes,
397 tot_reads + tot_writes);
398 free(test_rcu_pointer);
399 free(tid_reader);
400 free(tid_writer);
401 free(count_reader);
402 free(count_writer);
403 return 0;
404 }
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