e15c4668c0c1cb200f616d7dd29f1ade71375fa5
[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 "../config.h"
25 #include <stdio.h>
26 #include <pthread.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sys/types.h>
30 #include <sys/wait.h>
31 #include <unistd.h>
32 #include <stdio.h>
33 #include <assert.h>
34 #include <sys/syscall.h>
35 #include <sched.h>
36 #include <errno.h>
37
38 #include <urcu/arch.h>
39
40 /* hardcoded number of CPUs */
41 #define NR_CPUS 16384
42
43 #if defined(_syscall0)
44 _syscall0(pid_t, gettid)
45 #elif defined(__NR_gettid)
46 static inline pid_t gettid(void)
47 {
48 return syscall(__NR_gettid);
49 }
50 #else
51 #warning "use pid as tid"
52 static inline pid_t gettid(void)
53 {
54 return getpid();
55 }
56 #endif
57
58 #ifndef DYNAMIC_LINK_TEST
59 #define _LGPL_SOURCE
60 #else
61 #define debug_yield_read()
62 #endif
63 #include <urcu.h>
64 #include <urcu-defer.h>
65
66 struct test_array {
67 int a;
68 };
69
70 static volatile int test_go, test_stop;
71
72 static unsigned long wdelay;
73
74 static struct test_array *test_rcu_pointer;
75
76 static unsigned long duration;
77
78 /* read-side C.S. duration, in loops */
79 static unsigned long rduration;
80
81 /* write-side C.S. duration, in loops */
82 static unsigned long wduration;
83
84 static inline void loop_sleep(unsigned long l)
85 {
86 while(l-- != 0)
87 cpu_relax();
88 }
89
90 static int verbose_mode;
91
92 #define printf_verbose(fmt, args...) \
93 do { \
94 if (verbose_mode) \
95 printf(fmt, args); \
96 } while (0)
97
98 static unsigned int cpu_affinities[NR_CPUS];
99 static unsigned int next_aff = 0;
100 static int use_affinity = 0;
101
102 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
103
104 #ifndef HAVE_CPU_SET_T
105 typedef unsigned long cpu_set_t;
106 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
107 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
108 #endif
109
110 static void set_affinity(void)
111 {
112 cpu_set_t mask;
113 int cpu;
114 int ret;
115
116 if (!use_affinity)
117 return;
118
119 #if HAVE_SCHED_SETAFFINITY
120 ret = pthread_mutex_lock(&affinity_mutex);
121 if (ret) {
122 perror("Error in pthread mutex lock");
123 exit(-1);
124 }
125 cpu = cpu_affinities[next_aff++];
126 ret = pthread_mutex_unlock(&affinity_mutex);
127 if (ret) {
128 perror("Error in pthread mutex unlock");
129 exit(-1);
130 }
131
132 CPU_ZERO(&mask);
133 CPU_SET(cpu, &mask);
134 #if SCHED_SETAFFINITY_ARGS == 2
135 sched_setaffinity(0, &mask);
136 #else
137 sched_setaffinity(0, sizeof(mask), &mask);
138 #endif
139 #endif /* HAVE_SCHED_SETAFFINITY */
140 }
141
142 /*
143 * returns 0 if test should end.
144 */
145 static int test_duration_write(void)
146 {
147 return !test_stop;
148 }
149
150 static int test_duration_read(void)
151 {
152 return !test_stop;
153 }
154
155 static unsigned long long __thread nr_writes;
156 static unsigned long long __thread nr_reads;
157
158 static
159 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes;
160
161 static unsigned int nr_readers;
162 static unsigned int nr_writers;
163
164 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
165
166 void rcu_copy_mutex_lock(void)
167 {
168 int ret;
169 ret = pthread_mutex_lock(&rcu_copy_mutex);
170 if (ret) {
171 perror("Error in pthread mutex lock");
172 exit(-1);
173 }
174 }
175
176 void rcu_copy_mutex_unlock(void)
177 {
178 int ret;
179
180 ret = pthread_mutex_unlock(&rcu_copy_mutex);
181 if (ret) {
182 perror("Error in pthread mutex unlock");
183 exit(-1);
184 }
185 }
186
187 void *thr_reader(void *_count)
188 {
189 unsigned long long *count = _count;
190 struct test_array *local_ptr;
191
192 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
193 "reader", pthread_self(), (unsigned long)gettid());
194
195 set_affinity();
196
197 rcu_register_thread();
198
199 while (!test_go)
200 {
201 }
202 smp_mb();
203
204 for (;;) {
205 rcu_read_lock();
206 local_ptr = rcu_dereference(test_rcu_pointer);
207 debug_yield_read();
208 if (local_ptr)
209 assert(local_ptr->a == 8);
210 if (unlikely(rduration))
211 loop_sleep(rduration);
212 rcu_read_unlock();
213 nr_reads++;
214 if (unlikely(!test_duration_read()))
215 break;
216 }
217
218 rcu_unregister_thread();
219
220 *count = nr_reads;
221 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
222 "reader", pthread_self(), (unsigned long)gettid());
223 return ((void*)1);
224
225 }
226
227 static void test_cb2(void *data)
228 {
229 }
230
231 static void test_cb1(void *data)
232 {
233 }
234
235 void *thr_writer(void *data)
236 {
237 unsigned long wtidx = (unsigned long)data;
238 struct test_array *new, *old = NULL;
239
240 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
241 "writer", pthread_self(), (unsigned long)gettid());
242
243 set_affinity();
244
245 rcu_defer_register_thread();
246
247 while (!test_go)
248 {
249 }
250 smp_mb();
251
252 for (;;) {
253 new = malloc(sizeof(*new));
254 new->a = 8;
255 old = rcu_xchg_pointer(&test_rcu_pointer, new);
256 if (unlikely(wduration))
257 loop_sleep(wduration);
258 defer_rcu(free, old);
259 defer_rcu(test_cb1, old);
260 defer_rcu(test_cb1, (void *)-2L);
261 defer_rcu(test_cb1, (void *)-2L);
262 defer_rcu(test_cb1, old);
263 defer_rcu(test_cb2, (void *)-2L);
264 defer_rcu(test_cb2, (void *)-4L);
265 defer_rcu(test_cb2, (void *)-2L);
266 nr_writes++;
267 if (unlikely(!test_duration_write()))
268 break;
269 if (unlikely(wdelay))
270 loop_sleep(wdelay);
271 }
272
273 rcu_defer_unregister_thread();
274
275 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
276 "writer", pthread_self(), (unsigned long)gettid());
277 tot_nr_writes[wtidx] = nr_writes;
278 return ((void*)2);
279 }
280
281 void show_usage(int argc, char **argv)
282 {
283 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
284 #ifdef DEBUG_YIELD
285 printf(" [-r] [-w] (yield reader and/or writer)");
286 #endif
287 printf(" [-d delay] (writer period (us))");
288 printf(" [-c duration] (reader C.S. duration (in loops))");
289 printf(" [-e duration] (writer C.S. duration (in loops))");
290 printf(" [-v] (verbose output)");
291 printf(" [-a cpu#] [-a cpu#]... (affinity)");
292 printf("\n");
293 }
294
295 int main(int argc, char **argv)
296 {
297 int err;
298 pthread_t *tid_reader, *tid_writer;
299 void *tret;
300 unsigned long long *count_reader;
301 unsigned long long tot_reads = 0, tot_writes = 0;
302 int i, a;
303
304 if (argc < 4) {
305 show_usage(argc, argv);
306 return -1;
307 }
308
309 err = sscanf(argv[1], "%u", &nr_readers);
310 if (err != 1) {
311 show_usage(argc, argv);
312 return -1;
313 }
314
315 err = sscanf(argv[2], "%u", &nr_writers);
316 if (err != 1) {
317 show_usage(argc, argv);
318 return -1;
319 }
320
321 err = sscanf(argv[3], "%lu", &duration);
322 if (err != 1) {
323 show_usage(argc, argv);
324 return -1;
325 }
326
327 for (i = 4; i < argc; i++) {
328 if (argv[i][0] != '-')
329 continue;
330 switch (argv[i][1]) {
331 #ifdef DEBUG_YIELD
332 case 'r':
333 yield_active |= YIELD_READ;
334 break;
335 case 'w':
336 yield_active |= YIELD_WRITE;
337 break;
338 #endif
339 case 'a':
340 if (argc < i + 2) {
341 show_usage(argc, argv);
342 return -1;
343 }
344 a = atoi(argv[++i]);
345 cpu_affinities[next_aff++] = a;
346 use_affinity = 1;
347 printf_verbose("Adding CPU %d affinity\n", a);
348 break;
349 case 'c':
350 if (argc < i + 2) {
351 show_usage(argc, argv);
352 return -1;
353 }
354 rduration = atol(argv[++i]);
355 break;
356 case 'd':
357 if (argc < i + 2) {
358 show_usage(argc, argv);
359 return -1;
360 }
361 wdelay = atol(argv[++i]);
362 break;
363 case 'e':
364 if (argc < i + 2) {
365 show_usage(argc, argv);
366 return -1;
367 }
368 wduration = atol(argv[++i]);
369 break;
370 case 'v':
371 verbose_mode = 1;
372 break;
373 }
374 }
375
376 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
377 duration, nr_readers, nr_writers);
378 printf_verbose("Writer delay : %lu loops.\n", wdelay);
379 printf_verbose("Reader duration : %lu loops.\n", rduration);
380 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
381 "main", pthread_self(), (unsigned long)gettid());
382
383 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
384 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
385 count_reader = malloc(sizeof(*count_reader) * nr_readers);
386 tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
387
388 next_aff = 0;
389
390 for (i = 0; i < nr_readers; i++) {
391 err = pthread_create(&tid_reader[i], NULL, thr_reader,
392 &count_reader[i]);
393 if (err != 0)
394 exit(1);
395 }
396 for (i = 0; i < nr_writers; i++) {
397 err = pthread_create(&tid_writer[i], NULL, thr_writer,
398 (void *)(long)i);
399 if (err != 0)
400 exit(1);
401 }
402
403 smp_mb();
404
405 test_go = 1;
406
407 sleep(duration);
408
409 test_stop = 1;
410
411 for (i = 0; i < nr_readers; i++) {
412 err = pthread_join(tid_reader[i], &tret);
413 if (err != 0)
414 exit(1);
415 tot_reads += count_reader[i];
416 }
417 for (i = 0; i < nr_writers; i++) {
418 err = pthread_join(tid_writer[i], &tret);
419 if (err != 0)
420 exit(1);
421 tot_writes += tot_nr_writes[i];
422 }
423
424 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
425 tot_writes);
426 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
427 "nr_writers %3u "
428 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
429 argv[0], duration, nr_readers, rduration, wduration,
430 nr_writers, wdelay, tot_reads, tot_writes,
431 tot_reads + tot_writes);
432 free(tid_reader);
433 free(tid_writer);
434 free(count_reader);
435 free(tot_nr_writes);
436
437 return 0;
438 }
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