9982f6d2667537068028af06853112677a544b18
[urcu.git] / tests / benchmark / test_urcu.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.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
104 CPU_ZERO(&mask);
105 CPU_SET(cpu, &mask);
106 sched_setaffinity(0, sizeof(mask), &mask);
107 #endif /* HAVE_SCHED_SETAFFINITY */
108 }
109
110 /*
111 * returns 0 if test should end.
112 */
113 static int test_duration_write(void)
114 {
115 return !test_stop;
116 }
117
118 static int test_duration_read(void)
119 {
120 return !test_stop;
121 }
122
123 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
124 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
125
126 static unsigned int nr_readers;
127 static unsigned int nr_writers;
128
129 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
130
131 void rcu_copy_mutex_lock(void)
132 {
133 int ret;
134 ret = pthread_mutex_lock(&rcu_copy_mutex);
135 if (ret) {
136 perror("Error in pthread mutex lock");
137 exit(-1);
138 }
139 }
140
141 void rcu_copy_mutex_unlock(void)
142 {
143 int ret;
144
145 ret = pthread_mutex_unlock(&rcu_copy_mutex);
146 if (ret) {
147 perror("Error in pthread mutex unlock");
148 exit(-1);
149 }
150 }
151
152 void *thr_reader(void *_count)
153 {
154 unsigned long long *count = _count;
155 int *local_ptr;
156
157 printf_verbose("thread_begin %s, tid %lu\n",
158 "reader", urcu_get_thread_id());
159
160 set_affinity();
161
162 rcu_register_thread();
163 assert(!rcu_read_ongoing());
164
165 while (!test_go)
166 {
167 }
168 cmm_smp_mb();
169
170 for (;;) {
171 rcu_read_lock();
172 assert(rcu_read_ongoing());
173 local_ptr = rcu_dereference(test_rcu_pointer);
174 rcu_debug_yield_read();
175 if (local_ptr)
176 assert(*local_ptr == 8);
177 if (caa_unlikely(rduration))
178 loop_sleep(rduration);
179 rcu_read_unlock();
180 URCU_TLS(nr_reads)++;
181 if (caa_unlikely(!test_duration_read()))
182 break;
183 }
184
185 rcu_unregister_thread();
186
187 /* test extra thread registration */
188 rcu_register_thread();
189 rcu_unregister_thread();
190
191 *count = URCU_TLS(nr_reads);
192 printf_verbose("thread_end %s, tid %lu\n",
193 "reader", urcu_get_thread_id());
194 return ((void*)1);
195
196 }
197
198 void *thr_writer(void *_count)
199 {
200 unsigned long long *count = _count;
201 int *new, *old;
202
203 printf_verbose("thread_begin %s, tid %lu\n",
204 "writer", urcu_get_thread_id());
205
206 set_affinity();
207
208 while (!test_go)
209 {
210 }
211 cmm_smp_mb();
212
213 for (;;) {
214 new = malloc(sizeof(int));
215 assert(new);
216 *new = 8;
217 old = rcu_xchg_pointer(&test_rcu_pointer, new);
218 if (caa_unlikely(wduration))
219 loop_sleep(wduration);
220 synchronize_rcu();
221 if (old)
222 *old = 0;
223 free(old);
224 URCU_TLS(nr_writes)++;
225 if (caa_unlikely(!test_duration_write()))
226 break;
227 if (caa_unlikely(wdelay))
228 loop_sleep(wdelay);
229 }
230
231 printf_verbose("thread_end %s, tid %lu\n",
232 "writer", urcu_get_thread_id());
233 *count = URCU_TLS(nr_writes);
234 return ((void*)2);
235 }
236
237 void show_usage(int argc, char **argv)
238 {
239 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
240 argv[0]);
241 printf("OPTIONS:\n");
242 printf(" [-r] [-w] (yield reader and/or writer)\n");
243 printf(" [-d delay] (writer period (us))\n");
244 printf(" [-c duration] (reader C.S. duration (in loops))\n");
245 printf(" [-e duration] (writer C.S. duration (in loops))\n");
246 printf(" [-v] (verbose output)\n");
247 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
248 printf("\n");
249 }
250
251 int main(int argc, char **argv)
252 {
253 int err;
254 pthread_t *tid_reader, *tid_writer;
255 void *tret;
256 unsigned long long *count_reader, *count_writer;
257 unsigned long long tot_reads = 0, tot_writes = 0;
258 int i, a;
259 unsigned int i_thr;
260
261 if (argc < 4) {
262 show_usage(argc, argv);
263 return -1;
264 }
265
266 err = sscanf(argv[1], "%u", &nr_readers);
267 if (err != 1) {
268 show_usage(argc, argv);
269 return -1;
270 }
271
272 err = sscanf(argv[2], "%u", &nr_writers);
273 if (err != 1) {
274 show_usage(argc, argv);
275 return -1;
276 }
277
278 err = sscanf(argv[3], "%lu", &duration);
279 if (err != 1) {
280 show_usage(argc, argv);
281 return -1;
282 }
283
284 for (i = 4; i < argc; i++) {
285 if (argv[i][0] != '-')
286 continue;
287 switch (argv[i][1]) {
288 case 'r':
289 rcu_debug_yield_enable(RCU_YIELD_READ);
290 break;
291 case 'w':
292 rcu_debug_yield_enable(RCU_YIELD_WRITE);
293 break;
294 case 'a':
295 if (argc < i + 2) {
296 show_usage(argc, argv);
297 return -1;
298 }
299 a = atoi(argv[++i]);
300 cpu_affinities[next_aff++] = a;
301 use_affinity = 1;
302 printf_verbose("Adding CPU %d affinity\n", a);
303 break;
304 case 'c':
305 if (argc < i + 2) {
306 show_usage(argc, argv);
307 return -1;
308 }
309 rduration = atol(argv[++i]);
310 break;
311 case 'd':
312 if (argc < i + 2) {
313 show_usage(argc, argv);
314 return -1;
315 }
316 wdelay = atol(argv[++i]);
317 break;
318 case 'e':
319 if (argc < i + 2) {
320 show_usage(argc, argv);
321 return -1;
322 }
323 wduration = atol(argv[++i]);
324 break;
325 case 'v':
326 verbose_mode = 1;
327 break;
328 }
329 }
330
331 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
332 duration, nr_readers, nr_writers);
333 printf_verbose("Writer delay : %lu loops.\n", wdelay);
334 printf_verbose("Reader duration : %lu loops.\n", rduration);
335 printf_verbose("thread %-6s, tid %lu\n",
336 "main", urcu_get_thread_id());
337
338 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
339 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
340 count_reader = calloc(nr_readers, sizeof(*count_reader));
341 count_writer = calloc(nr_writers, sizeof(*count_writer));
342
343 next_aff = 0;
344
345 for (i_thr = 0; i_thr < nr_readers; i_thr++) {
346 err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
347 &count_reader[i_thr]);
348 if (err != 0)
349 exit(1);
350 }
351 for (i_thr = 0; i_thr < nr_writers; i_thr++) {
352 err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
353 &count_writer[i_thr]);
354 if (err != 0)
355 exit(1);
356 }
357
358 cmm_smp_mb();
359
360 test_go = 1;
361
362 sleep(duration);
363
364 test_stop = 1;
365
366 for (i_thr = 0; i_thr < nr_readers; i_thr++) {
367 err = pthread_join(tid_reader[i_thr], &tret);
368 if (err != 0)
369 exit(1);
370 tot_reads += count_reader[i_thr];
371 }
372 for (i_thr = 0; i_thr < nr_writers; i_thr++) {
373 err = pthread_join(tid_writer[i_thr], &tret);
374 if (err != 0)
375 exit(1);
376 tot_writes += count_writer[i_thr];
377 }
378
379 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
380 tot_writes);
381 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
382 "nr_writers %3u "
383 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
384 argv[0], duration, nr_readers, rduration, wduration,
385 nr_writers, wdelay, tot_reads, tot_writes,
386 tot_reads + tot_writes);
387 free(test_rcu_pointer);
388 free(tid_reader);
389 free(tid_writer);
390 free(count_reader);
391 free(count_writer);
392 return 0;
393 }
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