065557a1307d8f3cfe22a6c8ea6b6a39a0b3603e
[urcu.git] / tests / test_urcu_qsbr.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-qsbr.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 CPU_ZERO(&mask);
126 CPU_SET(cpu, &mask);
127 #if SCHED_SETAFFINITY_ARGS == 2
128 sched_setaffinity(0, &mask);
129 #else
130 sched_setaffinity(0, sizeof(mask), &mask);
131 #endif
132 #endif /* HAVE_SCHED_SETAFFINITY */
133 }
134
135 /*
136 * returns 0 if test should end.
137 */
138 static int test_duration_write(void)
139 {
140 return !test_stop;
141 }
142
143 static int test_duration_read(void)
144 {
145 return !test_stop;
146 }
147
148 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
149 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
150
151 static unsigned int nr_readers;
152 static unsigned int nr_writers;
153
154 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
155
156 void rcu_copy_mutex_lock(void)
157 {
158 int ret;
159 ret = pthread_mutex_lock(&rcu_copy_mutex);
160 if (ret) {
161 perror("Error in pthread mutex lock");
162 exit(-1);
163 }
164 }
165
166 void rcu_copy_mutex_unlock(void)
167 {
168 int ret;
169
170 ret = pthread_mutex_unlock(&rcu_copy_mutex);
171 if (ret) {
172 perror("Error in pthread mutex unlock");
173 exit(-1);
174 }
175 }
176
177 void *thr_reader(void *_count)
178 {
179 unsigned long long *count = _count;
180 int *local_ptr;
181
182 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
183 "reader", (unsigned long) pthread_self(),
184 (unsigned long) gettid());
185
186 set_affinity();
187
188 rcu_register_thread();
189
190 while (!test_go)
191 {
192 }
193 cmm_smp_mb();
194
195 for (;;) {
196 rcu_read_lock();
197 local_ptr = rcu_dereference(test_rcu_pointer);
198 rcu_debug_yield_read();
199 if (local_ptr)
200 assert(*local_ptr == 8);
201 if (caa_unlikely(rduration))
202 loop_sleep(rduration);
203 rcu_read_unlock();
204 URCU_TLS(nr_reads)++;
205 /* QS each 1024 reads */
206 if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0))
207 rcu_quiescent_state();
208 if (caa_unlikely(!test_duration_read()))
209 break;
210 }
211
212 rcu_unregister_thread();
213
214 /* test extra thread registration */
215 rcu_register_thread();
216 rcu_unregister_thread();
217
218 *count = URCU_TLS(nr_reads);
219 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
220 "reader", (unsigned long) pthread_self(),
221 (unsigned long) gettid());
222 return ((void*)1);
223
224 }
225
226 void *thr_writer(void *_count)
227 {
228 unsigned long long *count = _count;
229 int *new, *old;
230
231 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
232 "writer", (unsigned long) pthread_self(),
233 (unsigned long) gettid());
234
235 set_affinity();
236
237 while (!test_go)
238 {
239 }
240 cmm_smp_mb();
241
242 for (;;) {
243 new = malloc(sizeof(int));
244 assert(new);
245 *new = 8;
246 old = rcu_xchg_pointer(&test_rcu_pointer, new);
247 if (caa_unlikely(wduration))
248 loop_sleep(wduration);
249 synchronize_rcu();
250 if (old)
251 *old = 0;
252 free(old);
253 URCU_TLS(nr_writes)++;
254 if (caa_unlikely(!test_duration_write()))
255 break;
256 if (caa_unlikely(wdelay))
257 loop_sleep(wdelay);
258 }
259
260 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
261 "writer", (unsigned long) pthread_self(),
262 (unsigned long) gettid());
263 *count = URCU_TLS(nr_writes);
264 return ((void*)2);
265 }
266
267 void show_usage(int argc, char **argv)
268 {
269 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
270 #ifdef DEBUG_YIELD
271 printf(" [-r] [-w] (yield reader and/or writer)");
272 #endif
273 printf(" [-d delay] (writer period (us))");
274 printf(" [-c duration] (reader C.S. duration (in loops))");
275 printf(" [-e duration] (writer C.S. duration (in loops))");
276 printf(" [-v] (verbose output)");
277 printf(" [-a cpu#] [-a cpu#]... (affinity)");
278 printf("\n");
279 }
280
281 int main(int argc, char **argv)
282 {
283 int err;
284 pthread_t *tid_reader, *tid_writer;
285 void *tret;
286 unsigned long long *count_reader, *count_writer;
287 unsigned long long tot_reads = 0, tot_writes = 0;
288 int i, a;
289
290 if (argc < 4) {
291 show_usage(argc, argv);
292 return -1;
293 }
294
295 err = sscanf(argv[1], "%u", &nr_readers);
296 if (err != 1) {
297 show_usage(argc, argv);
298 return -1;
299 }
300
301 err = sscanf(argv[2], "%u", &nr_writers);
302 if (err != 1) {
303 show_usage(argc, argv);
304 return -1;
305 }
306
307 err = sscanf(argv[3], "%lu", &duration);
308 if (err != 1) {
309 show_usage(argc, argv);
310 return -1;
311 }
312
313 for (i = 4; i < argc; i++) {
314 if (argv[i][0] != '-')
315 continue;
316 switch (argv[i][1]) {
317 #ifdef DEBUG_YIELD
318 case 'r':
319 rcu_yield_active |= RCU_RCU_YIELD_READ;
320 break;
321 case 'w':
322 rcu_yield_active |= RCU_RCU_YIELD_WRITE;
323 break;
324 #endif
325 case 'a':
326 if (argc < i + 2) {
327 show_usage(argc, argv);
328 return -1;
329 }
330 a = atoi(argv[++i]);
331 cpu_affinities[next_aff++] = a;
332 use_affinity = 1;
333 printf_verbose("Adding CPU %d affinity\n", a);
334 break;
335 case 'c':
336 if (argc < i + 2) {
337 show_usage(argc, argv);
338 return -1;
339 }
340 rduration = atol(argv[++i]);
341 break;
342 case 'd':
343 if (argc < i + 2) {
344 show_usage(argc, argv);
345 return -1;
346 }
347 wdelay = atol(argv[++i]);
348 break;
349 case 'e':
350 if (argc < i + 2) {
351 show_usage(argc, argv);
352 return -1;
353 }
354 wduration = atol(argv[++i]);
355 break;
356 case 'v':
357 verbose_mode = 1;
358 break;
359 }
360 }
361
362 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
363 duration, nr_readers, nr_writers);
364 printf_verbose("Writer delay : %lu loops.\n", wdelay);
365 printf_verbose("Reader duration : %lu loops.\n", rduration);
366 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
367 "main", (unsigned long) pthread_self(),
368 (unsigned long) gettid());
369
370 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
371 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
372 count_reader = malloc(sizeof(*count_reader) * nr_readers);
373 count_writer = malloc(sizeof(*count_writer) * nr_writers);
374
375 next_aff = 0;
376
377 for (i = 0; i < nr_readers; i++) {
378 err = pthread_create(&tid_reader[i], NULL, thr_reader,
379 &count_reader[i]);
380 if (err != 0)
381 exit(1);
382 }
383 for (i = 0; i < nr_writers; i++) {
384 err = pthread_create(&tid_writer[i], NULL, thr_writer,
385 &count_writer[i]);
386 if (err != 0)
387 exit(1);
388 }
389
390 cmm_smp_mb();
391
392 test_go = 1;
393
394 sleep(duration);
395
396 test_stop = 1;
397
398 for (i = 0; i < nr_readers; i++) {
399 err = pthread_join(tid_reader[i], &tret);
400 if (err != 0)
401 exit(1);
402 tot_reads += count_reader[i];
403 }
404 for (i = 0; i < nr_writers; i++) {
405 err = pthread_join(tid_writer[i], &tret);
406 if (err != 0)
407 exit(1);
408 tot_writes += count_writer[i];
409 }
410
411 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
412 tot_writes);
413 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
414 "nr_writers %3u "
415 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
416 argv[0], duration, nr_readers, rduration, wduration,
417 nr_writers, wdelay, tot_reads, tot_writes,
418 tot_reads + tot_writes);
419 free(test_rcu_pointer);
420 free(tid_reader);
421 free(tid_writer);
422 free(count_reader);
423 free(count_writer);
424 return 0;
425 }
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