827c117eb9a7c792e09274fd8169de25b2580050
[urcu.git] / tests / benchmark / test_rwlock.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 #include <stdio.h>
24 #include <pthread.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/types.h>
28 #include <sys/wait.h>
29 #include <unistd.h>
30 #include <stdio.h>
31 #include <assert.h>
32 #include <errno.h>
33
34 #include <urcu/arch.h>
35 #include <urcu/tls-compat.h>
36 #include "cpuset.h"
37 #include "thread-id.h"
38
39 /* hardcoded number of CPUs */
40 #define NR_CPUS 16384
41
42 #ifndef DYNAMIC_LINK_TEST
43 #define _LGPL_SOURCE
44 #endif
45 #include <urcu.h>
46
47 struct test_array {
48 int a;
49 };
50
51 /*
52 * static rwlock initializer is broken on Cygwin. Use runtime
53 * initialization.
54 */
55 pthread_rwlock_t lock;
56
57 static volatile int test_go, test_stop;
58
59 static unsigned long wdelay;
60
61 static volatile struct test_array test_array = { 8 };
62
63 static unsigned long duration;
64
65 /* read-side C.S. duration, in loops */
66 static unsigned long rduration;
67
68 /* write-side C.S. duration, in loops */
69 static unsigned long wduration;
70
71 static inline void loop_sleep(unsigned long loops)
72 {
73 while (loops-- != 0)
74 caa_cpu_relax();
75 }
76
77 static int verbose_mode;
78
79 #define printf_verbose(fmt, args...) \
80 do { \
81 if (verbose_mode) \
82 printf(fmt, args); \
83 } while (0)
84
85 static unsigned int cpu_affinities[NR_CPUS];
86 static unsigned int next_aff = 0;
87 static int use_affinity = 0;
88
89 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
90
91 static void set_affinity(void)
92 {
93 #if HAVE_SCHED_SETAFFINITY
94 cpu_set_t mask;
95 int cpu, ret;
96 #endif /* HAVE_SCHED_SETAFFINITY */
97
98 if (!use_affinity)
99 return;
100
101 #if HAVE_SCHED_SETAFFINITY
102 ret = pthread_mutex_lock(&affinity_mutex);
103 if (ret) {
104 perror("Error in pthread mutex lock");
105 exit(-1);
106 }
107 cpu = cpu_affinities[next_aff++];
108 ret = pthread_mutex_unlock(&affinity_mutex);
109 if (ret) {
110 perror("Error in pthread mutex unlock");
111 exit(-1);
112 }
113
114 CPU_ZERO(&mask);
115 CPU_SET(cpu, &mask);
116 #if SCHED_SETAFFINITY_ARGS == 2
117 sched_setaffinity(0, &mask);
118 #else
119 sched_setaffinity(0, sizeof(mask), &mask);
120 #endif
121 #endif /* HAVE_SCHED_SETAFFINITY */
122 }
123
124 /*
125 * returns 0 if test should end.
126 */
127 static int test_duration_write(void)
128 {
129 return !test_stop;
130 }
131
132 static int test_duration_read(void)
133 {
134 return !test_stop;
135 }
136
137 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
138 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
139
140 static unsigned int nr_readers;
141 static unsigned int nr_writers;
142
143 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
144
145 void rcu_copy_mutex_lock(void)
146 {
147 int ret;
148 ret = pthread_mutex_lock(&rcu_copy_mutex);
149 if (ret) {
150 perror("Error in pthread mutex lock");
151 exit(-1);
152 }
153 }
154
155 void rcu_copy_mutex_unlock(void)
156 {
157 int ret;
158
159 ret = pthread_mutex_unlock(&rcu_copy_mutex);
160 if (ret) {
161 perror("Error in pthread mutex unlock");
162 exit(-1);
163 }
164 }
165
166 void *thr_reader(void *_count)
167 {
168 unsigned long long *count = _count;
169
170 printf_verbose("thread_begin %s, tid %lu\n",
171 "reader", urcu_get_thread_id());
172
173 set_affinity();
174
175 while (!test_go)
176 {
177 }
178
179 for (;;) {
180 int a, ret;
181
182 ret = pthread_rwlock_rdlock(&lock);
183 if (ret) {
184 fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
185 abort();
186 }
187
188 a = test_array.a;
189 assert(a == 8);
190 if (caa_unlikely(rduration))
191 loop_sleep(rduration);
192
193 ret = pthread_rwlock_unlock(&lock);
194 if (ret) {
195 fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
196 abort();
197 }
198
199 URCU_TLS(nr_reads)++;
200 if (caa_unlikely(!test_duration_read()))
201 break;
202 }
203
204 *count = URCU_TLS(nr_reads);
205
206 printf_verbose("thread_end %s, tid %lu, count %llu\n",
207 "reader", urcu_get_thread_id(), *count);
208 return ((void*)1);
209
210 }
211
212 void *thr_writer(void *_count)
213 {
214 unsigned long long *count = _count;
215
216 printf_verbose("thread_begin %s, tid %lu\n",
217 "writer", urcu_get_thread_id());
218
219 set_affinity();
220
221 while (!test_go)
222 {
223 }
224 cmm_smp_mb();
225
226 for (;;) {
227 int ret;
228
229 ret = pthread_rwlock_wrlock(&lock);
230 if (ret) {
231 fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
232 abort();
233 }
234
235 test_array.a = 0;
236 test_array.a = 8;
237 if (caa_unlikely(wduration))
238 loop_sleep(wduration);
239
240 ret = pthread_rwlock_unlock(&lock);
241 if (ret) {
242 fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
243 abort();
244 }
245
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 *count = URCU_TLS(nr_writes);
253
254 printf_verbose("thread_end %s, tid %lu, count %llu\n",
255 "writer", urcu_get_thread_id(), *count);
256 return ((void*)2);
257 }
258
259 void show_usage(int argc, char **argv)
260 {
261 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
262 argv[0]);
263 printf("OPTIONS:\n");
264 printf(" [-d delay] (writer period (us))\n");
265 printf(" [-c duration] (reader C.S. duration (in loops))\n");
266 printf(" [-e duration] (writer C.S. duration (in loops))\n");
267 printf(" [-v] (verbose output)\n");
268 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
269 printf("\n");
270 }
271
272 int main(int argc, char **argv)
273 {
274 int err;
275 pthread_t *tid_reader, *tid_writer;
276 void *tret;
277 unsigned long long *count_reader, *count_writer;
278 unsigned long long tot_reads = 0, tot_writes = 0;
279 int i, a;
280
281 if (argc < 4) {
282 show_usage(argc, argv);
283 return -1;
284 }
285 cmm_smp_mb();
286
287 err = sscanf(argv[1], "%u", &nr_readers);
288 if (err != 1) {
289 show_usage(argc, argv);
290 return -1;
291 }
292
293 err = sscanf(argv[2], "%u", &nr_writers);
294 if (err != 1) {
295 show_usage(argc, argv);
296 return -1;
297 }
298
299 err = sscanf(argv[3], "%lu", &duration);
300 if (err != 1) {
301 show_usage(argc, argv);
302 return -1;
303 }
304
305 for (i = 4; i < argc; i++) {
306 if (argv[i][0] != '-')
307 continue;
308 switch (argv[i][1]) {
309 case 'a':
310 if (argc < i + 2) {
311 show_usage(argc, argv);
312 return -1;
313 }
314 a = atoi(argv[++i]);
315 cpu_affinities[next_aff++] = a;
316 use_affinity = 1;
317 printf_verbose("Adding CPU %d affinity\n", a);
318 break;
319 case 'c':
320 if (argc < i + 2) {
321 show_usage(argc, argv);
322 return -1;
323 }
324 rduration = atol(argv[++i]);
325 break;
326 case 'd':
327 if (argc < i + 2) {
328 show_usage(argc, argv);
329 return -1;
330 }
331 wdelay = atol(argv[++i]);
332 break;
333 case 'e':
334 if (argc < i + 2) {
335 show_usage(argc, argv);
336 return -1;
337 }
338 wduration = 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 readers, %u writers.\n",
347 duration, nr_readers, nr_writers);
348 printf_verbose("Writer delay : %lu loops.\n", wdelay);
349 printf_verbose("Writer duration : %lu loops.\n", wduration);
350 printf_verbose("Reader duration : %lu loops.\n", rduration);
351 printf_verbose("thread %-6s, tid %lu\n",
352 "main", urcu_get_thread_id());
353
354 err = pthread_rwlock_init(&lock, NULL);
355 if (err != 0) {
356 fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
357 exit(1);
358 }
359
360 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
361 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
362 count_reader = calloc(nr_readers, sizeof(*count_reader));
363 count_writer = calloc(nr_writers, sizeof(*count_writer));
364
365 next_aff = 0;
366
367 for (i = 0; i < nr_readers; i++) {
368 err = pthread_create(&tid_reader[i], NULL, thr_reader,
369 &count_reader[i]);
370 if (err != 0)
371 exit(1);
372 }
373 for (i = 0; i < nr_writers; i++) {
374 err = pthread_create(&tid_writer[i], NULL, thr_writer,
375 &count_writer[i]);
376 if (err != 0)
377 exit(1);
378 }
379
380 cmm_smp_mb();
381
382 test_go = 1;
383
384 sleep(duration);
385
386 test_stop = 1;
387
388 for (i = 0; i < nr_readers; i++) {
389 err = pthread_join(tid_reader[i], &tret);
390 if (err != 0)
391 exit(1);
392 tot_reads += count_reader[i];
393 }
394 for (i = 0; i < nr_writers; i++) {
395 err = pthread_join(tid_writer[i], &tret);
396 if (err != 0)
397 exit(1);
398 tot_writes += count_writer[i];
399 }
400
401 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
402 tot_writes);
403 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
404 "nr_writers %3u "
405 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
406 argv[0], duration, nr_readers, rduration, wduration,
407 nr_writers, wdelay, tot_reads, tot_writes,
408 tot_reads + tot_writes);
409
410 err = pthread_rwlock_destroy(&lock);
411 if (err != 0) {
412 fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
413 exit(1);
414 }
415 free(tid_reader);
416 free(tid_writer);
417 free(count_reader);
418 free(count_writer);
419 return 0;
420 }
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