6f52e5fc7ef65e2d11376230bbd78604ccb35af8
[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 #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 #endif
47 #include <urcu.h>
48
49 struct test_array {
50 int a;
51 };
52
53 pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
54
55 static volatile int test_go, test_stop;
56
57 static unsigned long wdelay;
58
59 static volatile struct test_array test_array = { 8 };
60
61 static unsigned long duration;
62
63 /* read-side C.S. duration, in loops */
64 static unsigned long rduration;
65
66 /* write-side C.S. duration, in loops */
67 static unsigned long wduration;
68
69 static inline void loop_sleep(unsigned long loops)
70 {
71 while (loops-- != 0)
72 caa_cpu_relax();
73 }
74
75 static int verbose_mode;
76
77 #define printf_verbose(fmt, args...) \
78 do { \
79 if (verbose_mode) \
80 printf(fmt, args); \
81 } while (0)
82
83 static unsigned int cpu_affinities[NR_CPUS];
84 static unsigned int next_aff = 0;
85 static int use_affinity = 0;
86
87 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
88
89 static void set_affinity(void)
90 {
91 #if HAVE_SCHED_SETAFFINITY
92 cpu_set_t mask;
93 int cpu, ret;
94 #endif /* HAVE_SCHED_SETAFFINITY */
95
96 if (!use_affinity)
97 return;
98
99 #if HAVE_SCHED_SETAFFINITY
100 ret = pthread_mutex_lock(&affinity_mutex);
101 if (ret) {
102 perror("Error in pthread mutex lock");
103 exit(-1);
104 }
105 cpu = cpu_affinities[next_aff++];
106 ret = pthread_mutex_unlock(&affinity_mutex);
107 if (ret) {
108 perror("Error in pthread mutex unlock");
109 exit(-1);
110 }
111
112 CPU_ZERO(&mask);
113 CPU_SET(cpu, &mask);
114 #if SCHED_SETAFFINITY_ARGS == 2
115 sched_setaffinity(0, &mask);
116 #else
117 sched_setaffinity(0, sizeof(mask), &mask);
118 #endif
119 #endif /* HAVE_SCHED_SETAFFINITY */
120 }
121
122 /*
123 * returns 0 if test should end.
124 */
125 static int test_duration_write(void)
126 {
127 return !test_stop;
128 }
129
130 static int test_duration_read(void)
131 {
132 return !test_stop;
133 }
134
135 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
136 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
137
138 static unsigned int nr_readers;
139 static unsigned int nr_writers;
140
141 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
142
143 void rcu_copy_mutex_lock(void)
144 {
145 int ret;
146 ret = pthread_mutex_lock(&rcu_copy_mutex);
147 if (ret) {
148 perror("Error in pthread mutex lock");
149 exit(-1);
150 }
151 }
152
153 void rcu_copy_mutex_unlock(void)
154 {
155 int ret;
156
157 ret = pthread_mutex_unlock(&rcu_copy_mutex);
158 if (ret) {
159 perror("Error in pthread mutex unlock");
160 exit(-1);
161 }
162 }
163
164 void *thr_reader(void *_count)
165 {
166 unsigned long long *count = _count;
167
168 printf_verbose("thread_begin %s, tid %lu\n",
169 "reader", urcu_get_thread_id());
170
171 set_affinity();
172
173 while (!test_go)
174 {
175 }
176
177 for (;;) {
178 pthread_rwlock_rdlock(&lock);
179 assert(test_array.a == 8);
180 if (caa_unlikely(rduration))
181 loop_sleep(rduration);
182 pthread_rwlock_unlock(&lock);
183 URCU_TLS(nr_reads)++;
184 if (caa_unlikely(!test_duration_read()))
185 break;
186 }
187
188 *count = URCU_TLS(nr_reads);
189 printf_verbose("thread_end %s, tid %lu\n",
190 "reader", urcu_get_thread_id());
191 return ((void*)1);
192
193 }
194
195 void *thr_writer(void *_count)
196 {
197 unsigned long long *count = _count;
198
199 printf_verbose("thread_begin %s, tid %lu\n",
200 "writer", urcu_get_thread_id());
201
202 set_affinity();
203
204 while (!test_go)
205 {
206 }
207 cmm_smp_mb();
208
209 for (;;) {
210 pthread_rwlock_wrlock(&lock);
211 test_array.a = 0;
212 test_array.a = 8;
213 if (caa_unlikely(wduration))
214 loop_sleep(wduration);
215 pthread_rwlock_unlock(&lock);
216 URCU_TLS(nr_writes)++;
217 if (caa_unlikely(!test_duration_write()))
218 break;
219 if (caa_unlikely(wdelay))
220 loop_sleep(wdelay);
221 }
222
223 printf_verbose("thread_end %s, tid %lu\n",
224 "writer", urcu_get_thread_id());
225 *count = URCU_TLS(nr_writes);
226 return ((void*)2);
227 }
228
229 void show_usage(int argc, char **argv)
230 {
231 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
232 argv[0]);
233 printf("OPTIONS:\n");
234 printf(" [-d delay] (writer period (us))\n");
235 printf(" [-c duration] (reader C.S. duration (in loops))\n");
236 printf(" [-e duration] (writer C.S. duration (in loops))\n");
237 printf(" [-v] (verbose output)\n");
238 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
239 printf("\n");
240 }
241
242 int main(int argc, char **argv)
243 {
244 int err;
245 pthread_t *tid_reader, *tid_writer;
246 void *tret;
247 unsigned long long *count_reader, *count_writer;
248 unsigned long long tot_reads = 0, tot_writes = 0;
249 int i, a;
250
251 if (argc < 4) {
252 show_usage(argc, argv);
253 return -1;
254 }
255 cmm_smp_mb();
256
257 err = sscanf(argv[1], "%u", &nr_readers);
258 if (err != 1) {
259 show_usage(argc, argv);
260 return -1;
261 }
262
263 err = sscanf(argv[2], "%u", &nr_writers);
264 if (err != 1) {
265 show_usage(argc, argv);
266 return -1;
267 }
268
269 err = sscanf(argv[3], "%lu", &duration);
270 if (err != 1) {
271 show_usage(argc, argv);
272 return -1;
273 }
274
275 for (i = 4; i < argc; i++) {
276 if (argv[i][0] != '-')
277 continue;
278 switch (argv[i][1]) {
279 case 'a':
280 if (argc < i + 2) {
281 show_usage(argc, argv);
282 return -1;
283 }
284 a = atoi(argv[++i]);
285 cpu_affinities[next_aff++] = a;
286 use_affinity = 1;
287 printf_verbose("Adding CPU %d affinity\n", a);
288 break;
289 case 'c':
290 if (argc < i + 2) {
291 show_usage(argc, argv);
292 return -1;
293 }
294 rduration = atol(argv[++i]);
295 break;
296 case 'd':
297 if (argc < i + 2) {
298 show_usage(argc, argv);
299 return -1;
300 }
301 wdelay = atol(argv[++i]);
302 break;
303 case 'e':
304 if (argc < i + 2) {
305 show_usage(argc, argv);
306 return -1;
307 }
308 wduration = atol(argv[++i]);
309 break;
310 case 'v':
311 verbose_mode = 1;
312 break;
313 }
314 }
315
316 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
317 duration, nr_readers, nr_writers);
318 printf_verbose("Writer delay : %lu loops.\n", wdelay);
319 printf_verbose("Reader duration : %lu loops.\n", rduration);
320 printf_verbose("thread %-6s, tid %lu\n",
321 "main", urcu_get_thread_id());
322
323 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
324 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
325 count_reader = calloc(nr_readers, sizeof(*count_reader));
326 count_writer = calloc(nr_writers, sizeof(*count_writer));
327
328 next_aff = 0;
329
330 for (i = 0; i < nr_readers; i++) {
331 err = pthread_create(&tid_reader[i], NULL, thr_reader,
332 &count_reader[i]);
333 if (err != 0)
334 exit(1);
335 }
336 for (i = 0; i < nr_writers; i++) {
337 err = pthread_create(&tid_writer[i], NULL, thr_writer,
338 &count_writer[i]);
339 if (err != 0)
340 exit(1);
341 }
342
343 cmm_smp_mb();
344
345 test_go = 1;
346
347 sleep(duration);
348
349 test_stop = 1;
350
351 for (i = 0; i < nr_readers; i++) {
352 err = pthread_join(tid_reader[i], &tret);
353 if (err != 0)
354 exit(1);
355 tot_reads += count_reader[i];
356 }
357 for (i = 0; i < nr_writers; i++) {
358 err = pthread_join(tid_writer[i], &tret);
359 if (err != 0)
360 exit(1);
361 tot_writes += count_writer[i];
362 }
363
364 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
365 tot_writes);
366 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
367 "nr_writers %3u "
368 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
369 argv[0], duration, nr_readers, rduration, wduration,
370 nr_writers, wdelay, tot_reads, tot_writes,
371 tot_reads + tot_writes);
372
373 free(tid_reader);
374 free(tid_writer);
375 free(count_reader);
376 free(count_writer);
377 return 0;
378 }
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