233b38498ced552ed04ba753af5974892d89ec2f
[urcu.git] / tests / test_urcu_defer.c
1 /*
2 * test_urcu_defer.c
3 *
4 * Userspace RCU library - test program (with automatic reclamation)
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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 #define _GNU_SOURCE
24 #include <stdio.h>
25 #include <pthread.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sys/types.h>
29 #include <sys/wait.h>
30 #include <unistd.h>
31 #include <stdio.h>
32 #include <assert.h>
33 #include <sys/syscall.h>
34 #include <sched.h>
35
36 #include "../arch.h"
37
38 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
39 #define CACHE_LINE_SIZE 4096
40
41 /* hardcoded number of CPUs */
42 #define NR_CPUS 16384
43
44 #if defined(_syscall0)
45 _syscall0(pid_t, gettid)
46 #elif defined(__NR_gettid)
47 static inline pid_t gettid(void)
48 {
49 return syscall(__NR_gettid);
50 }
51 #else
52 #warning "use pid as tid"
53 static inline pid_t gettid(void)
54 {
55 return getpid();
56 }
57 #endif
58
59 #ifndef DYNAMIC_LINK_TEST
60 #define _LGPL_SOURCE
61 #else
62 #define debug_yield_read()
63 #endif
64 #include "../urcu.h"
65 #include "../urcu-defer.h"
66
67 struct test_array {
68 int a;
69 };
70
71 static volatile int test_go, test_stop;
72
73 static unsigned long wdelay;
74
75 static struct test_array *test_rcu_pointer;
76
77 static unsigned long duration;
78
79 /* read-side C.S. duration, in loops */
80 static unsigned long rduration;
81
82 static inline void loop_sleep(unsigned long l)
83 {
84 while(l-- != 0)
85 cpu_relax();
86 }
87
88 static int verbose_mode;
89
90 #define printf_verbose(fmt, args...) \
91 do { \
92 if (verbose_mode) \
93 printf(fmt, args); \
94 } while (0)
95
96 static unsigned int cpu_affinities[NR_CPUS];
97 static unsigned int next_aff = 0;
98 static int use_affinity = 0;
99
100 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
101
102 static void set_affinity(void)
103 {
104 cpu_set_t mask;
105 int cpu;
106 int ret;
107
108 if (!use_affinity)
109 return;
110
111 ret = pthread_mutex_lock(&affinity_mutex);
112 if (ret) {
113 perror("Error in pthread mutex lock");
114 exit(-1);
115 }
116 cpu = cpu_affinities[next_aff++];
117 ret = pthread_mutex_unlock(&affinity_mutex);
118 if (ret) {
119 perror("Error in pthread mutex unlock");
120 exit(-1);
121 }
122 CPU_ZERO(&mask);
123 CPU_SET(cpu, &mask);
124 sched_setaffinity(0, sizeof(mask), &mask);
125 }
126
127 /*
128 * returns 0 if test should end.
129 */
130 static int test_duration_write(void)
131 {
132 return !test_stop;
133 }
134
135 static int test_duration_read(void)
136 {
137 return !test_stop;
138 }
139
140 static unsigned long long __thread nr_writes;
141 static unsigned long long __thread nr_reads;
142
143 static
144 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes;
145
146 static unsigned int nr_readers;
147 static unsigned int nr_writers;
148
149 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
150
151 void rcu_copy_mutex_lock(void)
152 {
153 int ret;
154 ret = pthread_mutex_lock(&rcu_copy_mutex);
155 if (ret) {
156 perror("Error in pthread mutex lock");
157 exit(-1);
158 }
159 }
160
161 void rcu_copy_mutex_unlock(void)
162 {
163 int ret;
164
165 ret = pthread_mutex_unlock(&rcu_copy_mutex);
166 if (ret) {
167 perror("Error in pthread mutex unlock");
168 exit(-1);
169 }
170 }
171
172 void *thr_reader(void *_count)
173 {
174 unsigned long long *count = _count;
175 struct test_array *local_ptr;
176
177 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
178 "reader", pthread_self(), (unsigned long)gettid());
179
180 set_affinity();
181
182 rcu_register_thread();
183
184 while (!test_go)
185 {
186 }
187 smp_mb();
188
189 for (;;) {
190 rcu_read_lock();
191 local_ptr = rcu_dereference(test_rcu_pointer);
192 debug_yield_read();
193 if (local_ptr)
194 assert(local_ptr->a == 8);
195 if (unlikely(rduration))
196 loop_sleep(rduration);
197 rcu_read_unlock();
198 nr_reads++;
199 if (unlikely(!test_duration_read()))
200 break;
201 }
202
203 rcu_unregister_thread();
204
205 *count = nr_reads;
206 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
207 "reader", pthread_self(), (unsigned long)gettid());
208 return ((void*)1);
209
210 }
211
212 static void test_cb2(void *data)
213 {
214 }
215
216 static void test_cb1(void *data)
217 {
218 }
219
220 void *thr_writer(void *data)
221 {
222 unsigned long wtidx = (unsigned long)data;
223 struct test_array *new, *old = NULL;
224
225 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
226 "writer", pthread_self(), (unsigned long)gettid());
227
228 set_affinity();
229
230 rcu_defer_register_thread();
231
232 while (!test_go)
233 {
234 }
235 smp_mb();
236
237 for (;;) {
238 new = malloc(sizeof(*new));
239 new->a = 8;
240 old = rcu_xchg_pointer(&test_rcu_pointer, new);
241 call_rcu(free, old);
242 #if 0
243 call_rcu(test_cb1, old);
244 call_rcu(test_cb1, (void *)-2L);
245 call_rcu(test_cb1, (void *)-2L);
246 call_rcu(test_cb1, old);
247 call_rcu(test_cb2, (void *)-2L);
248 #endif //0
249 call_rcu(test_cb2, (void *)-4L);
250 //call_rcu(test_cb2, (void *)-2L);
251 nr_writes++;
252 if (unlikely(!test_duration_write()))
253 break;
254 if (unlikely(wdelay))
255 loop_sleep(wdelay);
256 }
257
258 rcu_defer_unregister_thread();
259
260 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
261 "writer", pthread_self(), (unsigned long)gettid());
262 tot_nr_writes[wtidx] = nr_writes;
263 return ((void*)2);
264 }
265
266 void show_usage(int argc, char **argv)
267 {
268 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
269 #ifdef DEBUG_YIELD
270 printf(" [-r] [-w] (yield reader and/or writer)");
271 #endif
272 printf(" [-d delay] (writer period (us))");
273 printf(" [-c duration] (reader C.S. duration (in loops))");
274 printf(" [-v] (verbose output)");
275 printf(" [-a cpu#] [-a cpu#]... (affinity)");
276 printf("\n");
277 }
278
279 int main(int argc, char **argv)
280 {
281 int err;
282 pthread_t *tid_reader, *tid_writer;
283 void *tret;
284 unsigned long long *count_reader;
285 unsigned long long tot_reads = 0, tot_writes = 0;
286 int i, a;
287
288 if (argc < 4) {
289 show_usage(argc, argv);
290 return -1;
291 }
292
293 err = sscanf(argv[1], "%u", &nr_readers);
294 if (err != 1) {
295 show_usage(argc, argv);
296 return -1;
297 }
298
299 err = sscanf(argv[2], "%u", &nr_writers);
300 if (err != 1) {
301 show_usage(argc, argv);
302 return -1;
303 }
304
305 err = sscanf(argv[3], "%lu", &duration);
306 if (err != 1) {
307 show_usage(argc, argv);
308 return -1;
309 }
310
311 for (i = 4; i < argc; i++) {
312 if (argv[i][0] != '-')
313 continue;
314 switch (argv[i][1]) {
315 #ifdef DEBUG_YIELD
316 case 'r':
317 yield_active |= YIELD_READ;
318 break;
319 case 'w':
320 yield_active |= YIELD_WRITE;
321 break;
322 #endif
323 case 'a':
324 if (argc < i + 2) {
325 show_usage(argc, argv);
326 return -1;
327 }
328 a = atoi(argv[++i]);
329 cpu_affinities[next_aff++] = a;
330 use_affinity = 1;
331 printf_verbose("Adding CPU %d affinity\n", a);
332 break;
333 case 'c':
334 if (argc < i + 2) {
335 show_usage(argc, argv);
336 return -1;
337 }
338 rduration = atol(argv[++i]);
339 break;
340 case 'd':
341 if (argc < i + 2) {
342 show_usage(argc, argv);
343 return -1;
344 }
345 wdelay = atol(argv[++i]);
346 break;
347 case 'v':
348 verbose_mode = 1;
349 break;
350 }
351 }
352
353 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
354 duration, nr_readers, nr_writers);
355 printf_verbose("Writer delay : %lu loops.\n", wdelay);
356 printf_verbose("Reader duration : %lu loops.\n", rduration);
357 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
358 "main", pthread_self(), (unsigned long)gettid());
359
360 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
361 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
362 count_reader = malloc(sizeof(*count_reader) * nr_readers);
363 tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
364
365 next_aff = 0;
366
367 for (i = 0; i < nr_readers; i++) {
368 err = pthread_create(&tid_reader[i], NULL, thr_reader,
369 &count_reader[i]);
370 if (err != 0)
371 exit(1);
372 }
373 for (i = 0; i < nr_writers; i++) {
374 err = pthread_create(&tid_writer[i], NULL, thr_writer,
375 (void *)(long)i);
376 if (err != 0)
377 exit(1);
378 }
379
380 smp_mb();
381
382 test_go = 1;
383
384 sleep(duration);
385
386 test_stop = 1;
387
388 for (i = 0; i < nr_readers; i++) {
389 err = pthread_join(tid_reader[i], &tret);
390 if (err != 0)
391 exit(1);
392 tot_reads += count_reader[i];
393 }
394 for (i = 0; i < nr_writers; i++) {
395 err = pthread_join(tid_writer[i], &tret);
396 if (err != 0)
397 exit(1);
398 tot_writes += tot_nr_writes[i];
399 }
400
401 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
402 tot_writes);
403 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
404 "nr_writers %3u "
405 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
406 argv[0], duration, nr_readers, rduration,
407 nr_writers, wdelay, tot_reads, tot_writes,
408 tot_reads + tot_writes);
409 free(tid_reader);
410 free(tid_writer);
411 free(count_reader);
412 free(tot_nr_writes);
413
414 return 0;
415 }
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