fe34af3971a29322f78fb3c9c43de3310e2d1b73
[urcu.git] / tests / benchmark / test_urcu_assign.c
1 /*
2 * test_urcu_assign.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 #include "../common/debug-yield.h"
39
40 /* hardcoded number of CPUs */
41 #define NR_CPUS 16384
42
43 #ifndef DYNAMIC_LINK_TEST
44 #define _LGPL_SOURCE
45 #endif
46 #include <urcu.h>
47
48 struct test_array {
49 int a;
50 };
51
52 static volatile int test_go, test_stop;
53
54 static unsigned long wdelay;
55
56 static struct test_array *test_rcu_pointer;
57
58 static unsigned long duration;
59
60 /* read-side C.S. duration, in loops */
61 static unsigned long rduration;
62
63 /* write-side C.S. duration, in loops */
64 static unsigned long wduration;
65
66 static inline void loop_sleep(unsigned long loops)
67 {
68 while (loops-- != 0)
69 caa_cpu_relax();
70 }
71
72 static int verbose_mode;
73
74 #define printf_verbose(fmt, args...) \
75 do { \
76 if (verbose_mode) \
77 printf(fmt, args); \
78 } while (0)
79
80 static unsigned int cpu_affinities[NR_CPUS];
81 static unsigned int next_aff = 0;
82 static int use_affinity = 0;
83
84 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
85
86 static void set_affinity(void)
87 {
88 #if HAVE_SCHED_SETAFFINITY
89 cpu_set_t mask;
90 int cpu, ret;
91 #endif /* HAVE_SCHED_SETAFFINITY */
92
93 if (!use_affinity)
94 return;
95
96 #if HAVE_SCHED_SETAFFINITY
97 ret = pthread_mutex_lock(&affinity_mutex);
98 if (ret) {
99 perror("Error in pthread mutex lock");
100 exit(-1);
101 }
102 cpu = cpu_affinities[next_aff++];
103 ret = pthread_mutex_unlock(&affinity_mutex);
104 if (ret) {
105 perror("Error in pthread mutex unlock");
106 exit(-1);
107 }
108
109 CPU_ZERO(&mask);
110 CPU_SET(cpu, &mask);
111 #if SCHED_SETAFFINITY_ARGS == 2
112 sched_setaffinity(0, &mask);
113 #else
114 sched_setaffinity(0, sizeof(mask), &mask);
115 #endif
116 #endif /* HAVE_SCHED_SETAFFINITY */
117 }
118
119 /*
120 * returns 0 if test should end.
121 */
122 static int test_duration_write(void)
123 {
124 return !test_stop;
125 }
126
127 static int test_duration_read(void)
128 {
129 return !test_stop;
130 }
131
132 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
133 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
134
135 static unsigned int nr_readers;
136 static unsigned int nr_writers;
137
138 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
139
140 void rcu_copy_mutex_lock(void)
141 {
142 int ret;
143 ret = pthread_mutex_lock(&rcu_copy_mutex);
144 if (ret) {
145 perror("Error in pthread mutex lock");
146 exit(-1);
147 }
148 }
149
150 void rcu_copy_mutex_unlock(void)
151 {
152 int ret;
153
154 ret = pthread_mutex_unlock(&rcu_copy_mutex);
155 if (ret) {
156 perror("Error in pthread mutex unlock");
157 exit(-1);
158 }
159 }
160
161 /*
162 * malloc/free are reusing memory areas too quickly, which does not let us
163 * test races appropriately. Use a large circular array for allocations.
164 * ARRAY_SIZE is larger than nr_writers, and we keep the mutex across
165 * both alloc and free, which insures we never run over our tail.
166 */
167 #define ARRAY_SIZE (1048576 * nr_writers)
168 #define ARRAY_POISON 0xDEADBEEF
169 static int array_index;
170 static struct test_array *test_array;
171
172 static struct test_array *test_array_alloc(void)
173 {
174 struct test_array *ret;
175 int index;
176
177 index = array_index % ARRAY_SIZE;
178 assert(test_array[index].a == ARRAY_POISON ||
179 test_array[index].a == 0);
180 ret = &test_array[index];
181 array_index++;
182 if (array_index == ARRAY_SIZE)
183 array_index = 0;
184 return ret;
185 }
186
187 static void test_array_free(struct test_array *ptr)
188 {
189 if (!ptr)
190 return;
191 ptr->a = ARRAY_POISON;
192 }
193
194 void *thr_reader(void *_count)
195 {
196 unsigned long long *count = _count;
197 struct test_array *local_ptr;
198
199 printf_verbose("thread_begin %s, tid %lu\n",
200 "reader", urcu_get_thread_id());
201
202 set_affinity();
203
204 rcu_register_thread();
205
206 while (!test_go)
207 {
208 }
209 cmm_smp_mb();
210
211 for (;;) {
212 rcu_read_lock();
213 local_ptr = rcu_dereference(test_rcu_pointer);
214 rcu_debug_yield_read();
215 if (local_ptr)
216 assert(local_ptr->a == 8);
217 if (caa_unlikely(rduration))
218 loop_sleep(rduration);
219 rcu_read_unlock();
220 URCU_TLS(nr_reads)++;
221 if (caa_unlikely(!test_duration_read()))
222 break;
223 }
224
225 rcu_unregister_thread();
226
227 *count = URCU_TLS(nr_reads);
228 printf_verbose("thread_end %s, tid %lu\n",
229 "reader", urcu_get_thread_id());
230 return ((void*)1);
231
232 }
233
234 void *thr_writer(void *_count)
235 {
236 unsigned long long *count = _count;
237 struct test_array *new, *old;
238
239 printf_verbose("thread_begin %s, tid %lu\n",
240 "writer", urcu_get_thread_id());
241
242 set_affinity();
243
244 while (!test_go)
245 {
246 }
247 cmm_smp_mb();
248
249 for (;;) {
250 rcu_copy_mutex_lock();
251 new = test_array_alloc();
252 new->a = 8;
253 old = test_rcu_pointer;
254 rcu_assign_pointer(test_rcu_pointer, new);
255 if (caa_unlikely(wduration))
256 loop_sleep(wduration);
257 synchronize_rcu();
258 if (old)
259 old->a = 0;
260 test_array_free(old);
261 rcu_copy_mutex_unlock();
262 URCU_TLS(nr_writes)++;
263 if (caa_unlikely(!test_duration_write()))
264 break;
265 if (caa_unlikely(wdelay))
266 loop_sleep(wdelay);
267 }
268
269 printf_verbose("thread_end %s, tid %lu\n",
270 "writer", urcu_get_thread_id());
271 *count = URCU_TLS(nr_writes);
272 return ((void*)2);
273 }
274
275 void show_usage(int argc, char **argv)
276 {
277 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
278 argv[0]);
279 printf("OPTIONS:\n");
280 printf(" [-r] [-w] (yield reader and/or writer)\n");
281 printf(" [-d delay] (writer period (us))\n");
282 printf(" [-c duration] (reader C.S. duration (in loops))\n");
283 printf(" [-e duration] (writer C.S. duration (in loops))\n");
284 printf(" [-v] (verbose output)\n");
285 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
286 printf("\n");
287 }
288
289 int main(int argc, char **argv)
290 {
291 int err;
292 pthread_t *tid_reader, *tid_writer;
293 void *tret;
294 unsigned long long *count_reader, *count_writer;
295 unsigned long long tot_reads = 0, tot_writes = 0;
296 int i, a;
297
298 if (argc < 4) {
299 show_usage(argc, argv);
300 return -1;
301 }
302
303 err = sscanf(argv[1], "%u", &nr_readers);
304 if (err != 1) {
305 show_usage(argc, argv);
306 return -1;
307 }
308
309 err = sscanf(argv[2], "%u", &nr_writers);
310 if (err != 1) {
311 show_usage(argc, argv);
312 return -1;
313 }
314
315 err = sscanf(argv[3], "%lu", &duration);
316 if (err != 1) {
317 show_usage(argc, argv);
318 return -1;
319 }
320
321 for (i = 4; i < argc; i++) {
322 if (argv[i][0] != '-')
323 continue;
324 switch (argv[i][1]) {
325 case 'r':
326 rcu_debug_yield_enable(RCU_YIELD_READ);
327 break;
328 case 'w':
329 rcu_debug_yield_enable(RCU_YIELD_WRITE);
330 break;
331 case 'a':
332 if (argc < i + 2) {
333 show_usage(argc, argv);
334 return -1;
335 }
336 a = atoi(argv[++i]);
337 cpu_affinities[next_aff++] = a;
338 use_affinity = 1;
339 printf_verbose("Adding CPU %d affinity\n", a);
340 break;
341 case 'c':
342 if (argc < i + 2) {
343 show_usage(argc, argv);
344 return -1;
345 }
346 rduration = atol(argv[++i]);
347 break;
348 case 'd':
349 if (argc < i + 2) {
350 show_usage(argc, argv);
351 return -1;
352 }
353 wdelay = atol(argv[++i]);
354 break;
355 case 'e':
356 if (argc < i + 2) {
357 show_usage(argc, argv);
358 return -1;
359 }
360 wduration = atol(argv[++i]);
361 break;
362 case 'v':
363 verbose_mode = 1;
364 break;
365 }
366 }
367
368 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
369 duration, nr_readers, nr_writers);
370 printf_verbose("Writer delay : %lu loops.\n", wdelay);
371 printf_verbose("Reader duration : %lu loops.\n", rduration);
372 printf_verbose("thread %-6s, tid %lu\n",
373 "main", urcu_get_thread_id());
374
375 test_array = calloc(1, sizeof(*test_array) * ARRAY_SIZE);
376 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
377 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
378 count_reader = calloc(nr_readers, sizeof(*count_reader));
379 count_writer = calloc(nr_writers, sizeof(*count_writer));
380
381 next_aff = 0;
382
383 for (i = 0; i < nr_readers; i++) {
384 err = pthread_create(&tid_reader[i], NULL, thr_reader,
385 &count_reader[i]);
386 if (err != 0)
387 exit(1);
388 }
389 for (i = 0; i < nr_writers; i++) {
390 err = pthread_create(&tid_writer[i], NULL, thr_writer,
391 &count_writer[i]);
392 if (err != 0)
393 exit(1);
394 }
395
396 cmm_smp_mb();
397
398 test_go = 1;
399
400 sleep(duration);
401
402 test_stop = 1;
403
404 for (i = 0; i < nr_readers; i++) {
405 err = pthread_join(tid_reader[i], &tret);
406 if (err != 0)
407 exit(1);
408 tot_reads += count_reader[i];
409 }
410 for (i = 0; i < nr_writers; i++) {
411 err = pthread_join(tid_writer[i], &tret);
412 if (err != 0)
413 exit(1);
414 tot_writes += count_writer[i];
415 }
416
417 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
418 tot_writes);
419 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
420 "nr_writers %3u "
421 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
422 argv[0], duration, nr_readers, rduration, wduration,
423 nr_writers, wdelay, tot_reads, tot_writes,
424 tot_reads + tot_writes);
425 test_array_free(test_rcu_pointer);
426 free(test_array);
427 free(tid_reader);
428 free(tid_writer);
429 free(count_reader);
430 free(count_writer);
431 return 0;
432 }
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