cleanup: all functions have declarations (-Wmissing-prototypes)
[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 "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 struct test_array {
48 int a;
49 };
50
51 static volatile int test_go, test_stop;
52
53 static unsigned long wdelay;
54
55 static struct test_array *test_rcu_pointer;
56
57 static unsigned long duration;
58
59 /* read-side C.S. duration, in loops */
60 static unsigned long rduration;
61
62 /* write-side C.S. duration, in loops */
63 static unsigned long wduration;
64
65 static inline void loop_sleep(unsigned long loops)
66 {
67 while (loops-- != 0)
68 caa_cpu_relax();
69 }
70
71 static int verbose_mode;
72
73 #define printf_verbose(fmt, args...) \
74 do { \
75 if (verbose_mode) \
76 printf(fmt, args); \
77 } while (0)
78
79 static unsigned int cpu_affinities[NR_CPUS];
80 static unsigned int next_aff = 0;
81 static int use_affinity = 0;
82
83 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
84
85 static void set_affinity(void)
86 {
87 #if HAVE_SCHED_SETAFFINITY
88 cpu_set_t mask;
89 int cpu, ret;
90 #endif /* HAVE_SCHED_SETAFFINITY */
91
92 if (!use_affinity)
93 return;
94
95 #if HAVE_SCHED_SETAFFINITY
96 ret = pthread_mutex_lock(&affinity_mutex);
97 if (ret) {
98 perror("Error in pthread mutex lock");
99 exit(-1);
100 }
101 cpu = cpu_affinities[next_aff++];
102 ret = pthread_mutex_unlock(&affinity_mutex);
103 if (ret) {
104 perror("Error in pthread mutex unlock");
105 exit(-1);
106 }
107
108 CPU_ZERO(&mask);
109 CPU_SET(cpu, &mask);
110 sched_setaffinity(0, sizeof(mask), &mask);
111 #endif /* HAVE_SCHED_SETAFFINITY */
112 }
113
114 /*
115 * returns 0 if test should end.
116 */
117 static int test_duration_write(void)
118 {
119 return !test_stop;
120 }
121
122 static int test_duration_read(void)
123 {
124 return !test_stop;
125 }
126
127 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
128 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
129
130 static unsigned int nr_readers;
131 static unsigned int nr_writers;
132
133 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
134
135 static
136 void rcu_copy_mutex_lock(void)
137 {
138 int ret;
139 ret = pthread_mutex_lock(&rcu_copy_mutex);
140 if (ret) {
141 perror("Error in pthread mutex lock");
142 exit(-1);
143 }
144 }
145
146 static
147 void rcu_copy_mutex_unlock(void)
148 {
149 int ret;
150
151 ret = pthread_mutex_unlock(&rcu_copy_mutex);
152 if (ret) {
153 perror("Error in pthread mutex unlock");
154 exit(-1);
155 }
156 }
157
158 /*
159 * malloc/free are reusing memory areas too quickly, which does not let us
160 * test races appropriately. Use a large circular array for allocations.
161 * ARRAY_SIZE is larger than nr_writers, and we keep the mutex across
162 * both alloc and free, which insures we never run over our tail.
163 */
164 #define ARRAY_SIZE (1048576 * nr_writers)
165 #define ARRAY_POISON (int) 0xDEADBEEF
166 static unsigned int array_index;
167 static struct test_array *test_array;
168
169 static struct test_array *test_array_alloc(void)
170 {
171 struct test_array *ret;
172 int index;
173
174 index = array_index % ARRAY_SIZE;
175 assert(test_array[index].a == ARRAY_POISON ||
176 test_array[index].a == 0);
177 ret = &test_array[index];
178 array_index++;
179 if (array_index == ARRAY_SIZE)
180 array_index = 0;
181 return ret;
182 }
183
184 static void test_array_free(struct test_array *ptr)
185 {
186 if (!ptr)
187 return;
188 ptr->a = ARRAY_POISON;
189 }
190
191 static
192 void *thr_reader(void *_count)
193 {
194 unsigned long long *count = _count;
195 struct test_array *local_ptr;
196
197 printf_verbose("thread_begin %s, tid %lu\n",
198 "reader", urcu_get_thread_id());
199
200 set_affinity();
201
202 rcu_register_thread();
203
204 while (!test_go)
205 {
206 }
207 cmm_smp_mb();
208
209 for (;;) {
210 rcu_read_lock();
211 local_ptr = rcu_dereference(test_rcu_pointer);
212 rcu_debug_yield_read();
213 if (local_ptr)
214 assert(local_ptr->a == 8);
215 if (caa_unlikely(rduration))
216 loop_sleep(rduration);
217 rcu_read_unlock();
218 URCU_TLS(nr_reads)++;
219 if (caa_unlikely(!test_duration_read()))
220 break;
221 }
222
223 rcu_unregister_thread();
224
225 *count = URCU_TLS(nr_reads);
226 printf_verbose("thread_end %s, tid %lu\n",
227 "reader", urcu_get_thread_id());
228 return ((void*)1);
229
230 }
231
232 static
233 void *thr_writer(void *_count)
234 {
235 unsigned long long *count = _count;
236 struct test_array *new, *old;
237
238 printf_verbose("thread_begin %s, tid %lu\n",
239 "writer", urcu_get_thread_id());
240
241 set_affinity();
242
243 while (!test_go)
244 {
245 }
246 cmm_smp_mb();
247
248 for (;;) {
249 rcu_copy_mutex_lock();
250 new = test_array_alloc();
251 new->a = 8;
252 old = test_rcu_pointer;
253 rcu_assign_pointer(test_rcu_pointer, new);
254 if (caa_unlikely(wduration))
255 loop_sleep(wduration);
256 synchronize_rcu();
257 if (old)
258 old->a = 0;
259 test_array_free(old);
260 rcu_copy_mutex_unlock();
261 URCU_TLS(nr_writes)++;
262 if (caa_unlikely(!test_duration_write()))
263 break;
264 if (caa_unlikely(wdelay))
265 loop_sleep(wdelay);
266 }
267
268 printf_verbose("thread_end %s, tid %lu\n",
269 "writer", urcu_get_thread_id());
270 *count = URCU_TLS(nr_writes);
271 return ((void*)2);
272 }
273
274 static
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 unsigned int i_thr;
298
299 if (argc < 4) {
300 show_usage(argc, argv);
301 return -1;
302 }
303
304 err = sscanf(argv[1], "%u", &nr_readers);
305 if (err != 1) {
306 show_usage(argc, argv);
307 return -1;
308 }
309
310 err = sscanf(argv[2], "%u", &nr_writers);
311 if (err != 1) {
312 show_usage(argc, argv);
313 return -1;
314 }
315
316 err = sscanf(argv[3], "%lu", &duration);
317 if (err != 1) {
318 show_usage(argc, argv);
319 return -1;
320 }
321
322 for (i = 4; i < argc; i++) {
323 if (argv[i][0] != '-')
324 continue;
325 switch (argv[i][1]) {
326 case 'r':
327 rcu_debug_yield_enable(RCU_YIELD_READ);
328 break;
329 case 'w':
330 rcu_debug_yield_enable(RCU_YIELD_WRITE);
331 break;
332 case 'a':
333 if (argc < i + 2) {
334 show_usage(argc, argv);
335 return -1;
336 }
337 a = atoi(argv[++i]);
338 cpu_affinities[next_aff++] = a;
339 use_affinity = 1;
340 printf_verbose("Adding CPU %d affinity\n", a);
341 break;
342 case 'c':
343 if (argc < i + 2) {
344 show_usage(argc, argv);
345 return -1;
346 }
347 rduration = atol(argv[++i]);
348 break;
349 case 'd':
350 if (argc < i + 2) {
351 show_usage(argc, argv);
352 return -1;
353 }
354 wdelay = atol(argv[++i]);
355 break;
356 case 'e':
357 if (argc < i + 2) {
358 show_usage(argc, argv);
359 return -1;
360 }
361 wduration = atol(argv[++i]);
362 break;
363 case 'v':
364 verbose_mode = 1;
365 break;
366 }
367 }
368
369 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
370 duration, nr_readers, nr_writers);
371 printf_verbose("Writer delay : %lu loops.\n", wdelay);
372 printf_verbose("Reader duration : %lu loops.\n", rduration);
373 printf_verbose("thread %-6s, tid %lu\n",
374 "main", urcu_get_thread_id());
375
376 test_array = calloc(1, sizeof(*test_array) * ARRAY_SIZE);
377 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
378 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
379 count_reader = calloc(nr_readers, sizeof(*count_reader));
380 count_writer = calloc(nr_writers, sizeof(*count_writer));
381
382 next_aff = 0;
383
384 for (i_thr = 0; i_thr < nr_readers; i_thr++) {
385 err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
386 &count_reader[i_thr]);
387 if (err != 0)
388 exit(1);
389 }
390 for (i_thr = 0; i_thr < nr_writers; i_thr++) {
391 err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
392 &count_writer[i_thr]);
393 if (err != 0)
394 exit(1);
395 }
396
397 cmm_smp_mb();
398
399 test_go = 1;
400
401 sleep(duration);
402
403 test_stop = 1;
404
405 for (i_thr = 0; i_thr < nr_readers; i_thr++) {
406 err = pthread_join(tid_reader[i_thr], &tret);
407 if (err != 0)
408 exit(1);
409 tot_reads += count_reader[i_thr];
410 }
411 for (i_thr = 0; i_thr < nr_writers; i_thr++) {
412 err = pthread_join(tid_writer[i_thr], &tret);
413 if (err != 0)
414 exit(1);
415 tot_writes += count_writer[i_thr];
416 }
417
418 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
419 tot_writes);
420 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
421 "nr_writers %3u "
422 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
423 argv[0], duration, nr_readers, rduration, wduration,
424 nr_writers, wdelay, tot_reads, tot_writes,
425 tot_reads + tot_writes);
426
427 test_array_free(test_rcu_pointer);
428 free(test_array);
429 free(tid_reader);
430 free(tid_writer);
431 free(count_reader);
432 free(count_writer);
433
434 return 0;
435 }
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