8cb74ff560d7d6e40e452e6b0a3b3a097640db9d
[urcu.git] / tests / test_urcu_bp.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
40 #ifdef __linux__
41 #include <syscall.h>
42 #endif
43
44 /* hardcoded number of CPUs */
45 #define NR_CPUS 16384
46
47 #if defined(_syscall0)
48 _syscall0(pid_t, gettid)
49 #elif defined(__NR_gettid)
50 static inline pid_t gettid(void)
51 {
52 return syscall(__NR_gettid);
53 }
54 #else
55 #warning "use pid as tid"
56 static inline pid_t gettid(void)
57 {
58 return getpid();
59 }
60 #endif
61
62 #ifndef DYNAMIC_LINK_TEST
63 #define _LGPL_SOURCE
64 #else
65 #define rcu_debug_yield_read()
66 #endif
67 #include <urcu-bp.h>
68
69 static volatile int test_go, test_stop;
70
71 static unsigned long wdelay;
72
73 static int *test_rcu_pointer;
74
75 static unsigned long duration;
76
77 /* read-side C.S. duration, in loops */
78 static unsigned long rduration;
79
80 /* write-side C.S. duration, in loops */
81 static unsigned long wduration;
82
83 static inline void loop_sleep(unsigned long loops)
84 {
85 while (loops-- != 0)
86 caa_cpu_relax();
87 }
88
89 static int verbose_mode;
90
91 #define printf_verbose(fmt, args...) \
92 do { \
93 if (verbose_mode) \
94 printf(fmt, args); \
95 } while (0)
96
97 static unsigned int cpu_affinities[NR_CPUS];
98 static unsigned int next_aff = 0;
99 static int use_affinity = 0;
100
101 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
102
103 static void set_affinity(void)
104 {
105 #if HAVE_SCHED_SETAFFINITY
106 cpu_set_t mask;
107 int cpu, ret;
108 #endif /* HAVE_SCHED_SETAFFINITY */
109
110 if (!use_affinity)
111 return;
112
113 #if HAVE_SCHED_SETAFFINITY
114 ret = pthread_mutex_lock(&affinity_mutex);
115 if (ret) {
116 perror("Error in pthread mutex lock");
117 exit(-1);
118 }
119 cpu = cpu_affinities[next_aff++];
120 ret = pthread_mutex_unlock(&affinity_mutex);
121 if (ret) {
122 perror("Error in pthread mutex unlock");
123 exit(-1);
124 }
125
126 CPU_ZERO(&mask);
127 CPU_SET(cpu, &mask);
128 #if SCHED_SETAFFINITY_ARGS == 2
129 sched_setaffinity(0, &mask);
130 #else
131 sched_setaffinity(0, sizeof(mask), &mask);
132 #endif
133 #endif /* HAVE_SCHED_SETAFFINITY */
134 }
135
136 /*
137 * returns 0 if test should end.
138 */
139 static int test_duration_write(void)
140 {
141 return !test_stop;
142 }
143
144 static int test_duration_read(void)
145 {
146 return !test_stop;
147 }
148
149 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
150 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
151
152 static unsigned int nr_readers;
153 static unsigned int nr_writers;
154
155 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
156
157 void rcu_copy_mutex_lock(void)
158 {
159 int ret;
160 ret = pthread_mutex_lock(&rcu_copy_mutex);
161 if (ret) {
162 perror("Error in pthread mutex lock");
163 exit(-1);
164 }
165 }
166
167 void rcu_copy_mutex_unlock(void)
168 {
169 int ret;
170
171 ret = pthread_mutex_unlock(&rcu_copy_mutex);
172 if (ret) {
173 perror("Error in pthread mutex unlock");
174 exit(-1);
175 }
176 }
177
178 void *thr_reader(void *_count)
179 {
180 unsigned long long *count = _count;
181 int *local_ptr;
182
183 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
184 "reader", (unsigned long) pthread_self(),
185 (unsigned long) gettid());
186
187 set_affinity();
188
189 rcu_register_thread();
190
191 while (!test_go)
192 {
193 }
194 cmm_smp_mb();
195
196 for (;;) {
197 rcu_read_lock();
198 local_ptr = rcu_dereference(test_rcu_pointer);
199 rcu_debug_yield_read();
200 if (local_ptr)
201 assert(*local_ptr == 8);
202 if (caa_unlikely(rduration))
203 loop_sleep(rduration);
204 rcu_read_unlock();
205 URCU_TLS(nr_reads)++;
206 if (caa_unlikely(!test_duration_read()))
207 break;
208 }
209
210 rcu_unregister_thread();
211
212 *count = URCU_TLS(nr_reads);
213 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
214 "reader", (unsigned long) pthread_self(),
215 (unsigned long) gettid());
216 return ((void*)1);
217
218 }
219
220 void *thr_writer(void *_count)
221 {
222 unsigned long long *count = _count;
223 int *new, *old;
224
225 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
226 "writer", (unsigned long) pthread_self(),
227 (unsigned long) gettid());
228
229 set_affinity();
230
231 while (!test_go)
232 {
233 }
234 cmm_smp_mb();
235
236 for (;;) {
237 new = malloc(sizeof(int));
238 *new = 8;
239 old = rcu_xchg_pointer(&test_rcu_pointer, new);
240 if (caa_unlikely(wduration))
241 loop_sleep(wduration);
242 synchronize_rcu();
243 if (old)
244 *old = 0;
245 free(old);
246 URCU_TLS(nr_writes)++;
247 if (caa_unlikely(!test_duration_write()))
248 break;
249 if (caa_unlikely(wdelay))
250 loop_sleep(wdelay);
251 }
252
253 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
254 "writer", (unsigned long) pthread_self(),
255 (unsigned long) gettid());
256 *count = URCU_TLS(nr_writes);
257 return ((void*)2);
258 }
259
260 void show_usage(int argc, char **argv)
261 {
262 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
263 #ifdef DEBUG_YIELD
264 printf(" [-r] [-w] (yield reader and/or writer)");
265 #endif
266 printf(" [-d delay] (writer period (us))");
267 printf(" [-c duration] (reader C.S. duration (in loops))");
268 printf(" [-e duration] (writer C.S. duration (in loops))");
269 printf(" [-v] (verbose output)");
270 printf(" [-a cpu#] [-a cpu#]... (affinity)");
271 printf("\n");
272 }
273
274 int main(int argc, char **argv)
275 {
276 int err;
277 pthread_t *tid_reader, *tid_writer;
278 void *tret;
279 unsigned long long *count_reader, *count_writer;
280 unsigned long long tot_reads = 0, tot_writes = 0;
281 int i, a;
282
283 if (argc < 4) {
284 show_usage(argc, argv);
285 return -1;
286 }
287
288 err = sscanf(argv[1], "%u", &nr_readers);
289 if (err != 1) {
290 show_usage(argc, argv);
291 return -1;
292 }
293
294 err = sscanf(argv[2], "%u", &nr_writers);
295 if (err != 1) {
296 show_usage(argc, argv);
297 return -1;
298 }
299
300 err = sscanf(argv[3], "%lu", &duration);
301 if (err != 1) {
302 show_usage(argc, argv);
303 return -1;
304 }
305
306 for (i = 4; i < argc; i++) {
307 if (argv[i][0] != '-')
308 continue;
309 switch (argv[i][1]) {
310 #ifdef DEBUG_YIELD
311 case 'r':
312 rcu_yield_active |= RCU_YIELD_READ;
313 break;
314 case 'w':
315 rcu_yield_active |= RCU_YIELD_WRITE;
316 break;
317 #endif
318 case 'a':
319 if (argc < i + 2) {
320 show_usage(argc, argv);
321 return -1;
322 }
323 a = atoi(argv[++i]);
324 cpu_affinities[next_aff++] = a;
325 use_affinity = 1;
326 printf_verbose("Adding CPU %d affinity\n", a);
327 break;
328 case 'c':
329 if (argc < i + 2) {
330 show_usage(argc, argv);
331 return -1;
332 }
333 rduration = atol(argv[++i]);
334 break;
335 case 'd':
336 if (argc < i + 2) {
337 show_usage(argc, argv);
338 return -1;
339 }
340 wdelay = atol(argv[++i]);
341 break;
342 case 'e':
343 if (argc < i + 2) {
344 show_usage(argc, argv);
345 return -1;
346 }
347 wduration = atol(argv[++i]);
348 break;
349 case 'v':
350 verbose_mode = 1;
351 break;
352 }
353 }
354
355 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
356 duration, nr_readers, nr_writers);
357 printf_verbose("Writer delay : %lu loops.\n", wdelay);
358 printf_verbose("Reader duration : %lu loops.\n", rduration);
359 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
360 "main", (unsigned long) pthread_self(),
361 (unsigned long) gettid());
362
363 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
364 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
365 count_reader = malloc(sizeof(*count_reader) * nr_readers);
366 count_writer = malloc(sizeof(*count_writer) * nr_writers);
367
368 next_aff = 0;
369
370 for (i = 0; i < nr_readers; i++) {
371 err = pthread_create(&tid_reader[i], NULL, thr_reader,
372 &count_reader[i]);
373 if (err != 0)
374 exit(1);
375 }
376 for (i = 0; i < nr_writers; i++) {
377 err = pthread_create(&tid_writer[i], NULL, thr_writer,
378 &count_writer[i]);
379 if (err != 0)
380 exit(1);
381 }
382
383 cmm_smp_mb();
384
385 test_go = 1;
386
387 sleep(duration);
388
389 test_stop = 1;
390
391 for (i = 0; i < nr_readers; i++) {
392 err = pthread_join(tid_reader[i], &tret);
393 if (err != 0)
394 exit(1);
395 tot_reads += count_reader[i];
396 }
397 for (i = 0; i < nr_writers; i++) {
398 err = pthread_join(tid_writer[i], &tret);
399 if (err != 0)
400 exit(1);
401 tot_writes += count_writer[i];
402 }
403
404 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
405 tot_writes);
406 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
407 "nr_writers %3u "
408 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
409 argv[0], duration, nr_readers, rduration, wduration,
410 nr_writers, wdelay, tot_reads, tot_writes,
411 tot_reads + tot_writes);
412 free(test_rcu_pointer);
413 free(tid_reader);
414 free(tid_writer);
415 free(count_reader);
416 free(count_writer);
417 return 0;
418 }
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