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