aceb52747e90ab116999b7ec90a1a24c89c72a68
[urcu.git] / tests / benchmark / 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 #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 "thread-id.h"
37 #include "../common/debug-yield.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-qsbr.h"
46
47 static volatile int test_go, test_stop;
48
49 static unsigned long wdelay;
50
51 static int *test_rcu_pointer;
52
53 static unsigned long duration;
54
55 /* read-side C.S. duration, in loops */
56 static unsigned long rduration;
57
58 /* write-side C.S. duration, in loops */
59 static unsigned long wduration;
60
61 static inline void loop_sleep(unsigned long loops)
62 {
63 while (loops-- != 0)
64 caa_cpu_relax();
65 }
66
67 static int verbose_mode;
68
69 #define printf_verbose(fmt, args...) \
70 do { \
71 if (verbose_mode) \
72 printf(fmt, args); \
73 } while (0)
74
75 static unsigned int cpu_affinities[NR_CPUS];
76 static unsigned int next_aff = 0;
77 static int use_affinity = 0;
78
79 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
80
81 static void set_affinity(void)
82 {
83 #if HAVE_SCHED_SETAFFINITY
84 cpu_set_t mask;
85 int cpu, ret;
86 #endif /* HAVE_SCHED_SETAFFINITY */
87
88 if (!use_affinity)
89 return;
90
91 #if HAVE_SCHED_SETAFFINITY
92 ret = pthread_mutex_lock(&affinity_mutex);
93 if (ret) {
94 perror("Error in pthread mutex lock");
95 exit(-1);
96 }
97 cpu = cpu_affinities[next_aff++];
98 ret = pthread_mutex_unlock(&affinity_mutex);
99 if (ret) {
100 perror("Error in pthread mutex unlock");
101 exit(-1);
102 }
103 CPU_ZERO(&mask);
104 CPU_SET(cpu, &mask);
105 sched_setaffinity(0, sizeof(mask), &mask);
106 #endif /* HAVE_SCHED_SETAFFINITY */
107 }
108
109 /*
110 * returns 0 if test should end.
111 */
112 static int test_duration_write(void)
113 {
114 return !test_stop;
115 }
116
117 static int test_duration_read(void)
118 {
119 return !test_stop;
120 }
121
122 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
123 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
124
125 static unsigned int nr_readers;
126 static unsigned int nr_writers;
127
128 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
129
130 void rcu_copy_mutex_lock(void)
131 {
132 int ret;
133 ret = pthread_mutex_lock(&rcu_copy_mutex);
134 if (ret) {
135 perror("Error in pthread mutex lock");
136 exit(-1);
137 }
138 }
139
140 void rcu_copy_mutex_unlock(void)
141 {
142 int ret;
143
144 ret = pthread_mutex_unlock(&rcu_copy_mutex);
145 if (ret) {
146 perror("Error in pthread mutex unlock");
147 exit(-1);
148 }
149 }
150
151 void *thr_reader(void *_count)
152 {
153 unsigned long long *count = _count;
154 int *local_ptr;
155
156 printf_verbose("thread_begin %s, tid %lu\n",
157 "reader", urcu_get_thread_id());
158
159 set_affinity();
160
161 rcu_register_thread();
162
163 assert(rcu_read_ongoing());
164 rcu_thread_offline();
165 assert(!rcu_read_ongoing());
166 rcu_thread_online();
167
168 while (!test_go)
169 {
170 }
171 cmm_smp_mb();
172
173 for (;;) {
174 rcu_read_lock();
175 assert(rcu_read_ongoing());
176 local_ptr = rcu_dereference(test_rcu_pointer);
177 rcu_debug_yield_read();
178 if (local_ptr)
179 assert(*local_ptr == 8);
180 if (caa_unlikely(rduration))
181 loop_sleep(rduration);
182 rcu_read_unlock();
183 URCU_TLS(nr_reads)++;
184 /* QS each 1024 reads */
185 if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0))
186 rcu_quiescent_state();
187 if (caa_unlikely(!test_duration_read()))
188 break;
189 }
190
191 rcu_unregister_thread();
192
193 /* test extra thread registration */
194 rcu_register_thread();
195 rcu_unregister_thread();
196
197 *count = URCU_TLS(nr_reads);
198 printf_verbose("thread_end %s, tid %lu\n",
199 "reader", urcu_get_thread_id());
200 return ((void*)1);
201
202 }
203
204 void *thr_writer(void *_count)
205 {
206 unsigned long long *count = _count;
207 int *new, *old;
208
209 printf_verbose("thread_begin %s, tid %lu\n",
210 "writer", urcu_get_thread_id());
211
212 set_affinity();
213
214 while (!test_go)
215 {
216 }
217 cmm_smp_mb();
218
219 for (;;) {
220 new = malloc(sizeof(int));
221 assert(new);
222 *new = 8;
223 old = rcu_xchg_pointer(&test_rcu_pointer, new);
224 if (caa_unlikely(wduration))
225 loop_sleep(wduration);
226 synchronize_rcu();
227 if (old)
228 *old = 0;
229 free(old);
230 URCU_TLS(nr_writes)++;
231 if (caa_unlikely(!test_duration_write()))
232 break;
233 if (caa_unlikely(wdelay))
234 loop_sleep(wdelay);
235 }
236
237 printf_verbose("thread_end %s, tid %lu\n",
238 "writer", urcu_get_thread_id());
239 *count = URCU_TLS(nr_writes);
240 return ((void*)2);
241 }
242
243 void show_usage(int argc, char **argv)
244 {
245 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
246 argv[0]);
247 printf("OPTIONS:\n");
248 printf(" [-r] [-w] (yield reader and/or writer)\n");
249 printf(" [-d delay] (writer period (us))\n");
250 printf(" [-c duration] (reader C.S. duration (in loops))\n");
251 printf(" [-e duration] (writer C.S. duration (in loops))\n");
252 printf(" [-v] (verbose output)\n");
253 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
254 printf("\n");
255 }
256
257 int main(int argc, char **argv)
258 {
259 int err;
260 pthread_t *tid_reader, *tid_writer;
261 void *tret;
262 unsigned long long *count_reader, *count_writer;
263 unsigned long long tot_reads = 0, tot_writes = 0;
264 int i, a;
265 unsigned int i_thr;
266
267 if (argc < 4) {
268 show_usage(argc, argv);
269 return -1;
270 }
271
272 err = sscanf(argv[1], "%u", &nr_readers);
273 if (err != 1) {
274 show_usage(argc, argv);
275 return -1;
276 }
277
278 err = sscanf(argv[2], "%u", &nr_writers);
279 if (err != 1) {
280 show_usage(argc, argv);
281 return -1;
282 }
283
284 err = sscanf(argv[3], "%lu", &duration);
285 if (err != 1) {
286 show_usage(argc, argv);
287 return -1;
288 }
289
290 for (i = 4; i < argc; i++) {
291 if (argv[i][0] != '-')
292 continue;
293 switch (argv[i][1]) {
294 case 'r':
295 rcu_debug_yield_enable(RCU_YIELD_READ);
296 break;
297 case 'w':
298 rcu_debug_yield_enable(RCU_YIELD_WRITE);
299 break;
300 case 'a':
301 if (argc < i + 2) {
302 show_usage(argc, argv);
303 return -1;
304 }
305 a = atoi(argv[++i]);
306 cpu_affinities[next_aff++] = a;
307 use_affinity = 1;
308 printf_verbose("Adding CPU %d affinity\n", a);
309 break;
310 case 'c':
311 if (argc < i + 2) {
312 show_usage(argc, argv);
313 return -1;
314 }
315 rduration = atol(argv[++i]);
316 break;
317 case 'd':
318 if (argc < i + 2) {
319 show_usage(argc, argv);
320 return -1;
321 }
322 wdelay = atol(argv[++i]);
323 break;
324 case 'e':
325 if (argc < i + 2) {
326 show_usage(argc, argv);
327 return -1;
328 }
329 wduration = atol(argv[++i]);
330 break;
331 case 'v':
332 verbose_mode = 1;
333 break;
334 }
335 }
336
337 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
338 duration, nr_readers, nr_writers);
339 printf_verbose("Writer delay : %lu loops.\n", wdelay);
340 printf_verbose("Reader duration : %lu loops.\n", rduration);
341 printf_verbose("thread %-6s, tid %lu\n",
342 "main", urcu_get_thread_id());
343
344 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
345 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
346 count_reader = calloc(nr_readers, sizeof(*count_reader));
347 count_writer = calloc(nr_writers, sizeof(*count_writer));
348
349 next_aff = 0;
350
351 for (i_thr = 0; i_thr < nr_readers; i_thr++) {
352 err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
353 &count_reader[i_thr]);
354 if (err != 0)
355 exit(1);
356 }
357 for (i_thr = 0; i_thr < nr_writers; i_thr++) {
358 err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
359 &count_writer[i_thr]);
360 if (err != 0)
361 exit(1);
362 }
363
364 cmm_smp_mb();
365
366 test_go = 1;
367
368 sleep(duration);
369
370 test_stop = 1;
371
372 for (i_thr = 0; i_thr < nr_readers; i_thr++) {
373 err = pthread_join(tid_reader[i_thr], &tret);
374 if (err != 0)
375 exit(1);
376 tot_reads += count_reader[i_thr];
377 }
378 for (i_thr = 0; i_thr < nr_writers; i_thr++) {
379 err = pthread_join(tid_writer[i_thr], &tret);
380 if (err != 0)
381 exit(1);
382 tot_writes += count_writer[i_thr];
383 }
384
385 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
386 tot_writes);
387 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
388 "nr_writers %3u "
389 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
390 argv[0], duration, nr_readers, rduration, wduration,
391 nr_writers, wdelay, tot_reads, tot_writes,
392 tot_reads + tot_writes);
393 free(test_rcu_pointer);
394 free(tid_reader);
395 free(tid_writer);
396 free(count_reader);
397 free(count_writer);
398 return 0;
399 }
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