Test for CPU_SET
[urcu.git] / tests / test_urcu_assign.c
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1/*
2 * test_urcu_assign.c
3 *
4 * Userspace RCU library - test program
5 *
6982d6d7 6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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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
d8540fc5 24#include "../config.h"
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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>
074d8438 34#include <sched.h>
94b343fd 35#include <errno.h>
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36
37#include <urcu/arch.h>
bd252a04 38#include <urcu/tls-compat.h>
074d8438 39
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40#ifdef __linux__
41#include <syscall.h>
42#endif
43
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44/* hardcoded number of CPUs */
45#define NR_CPUS 16384
46
47#if defined(_syscall0)
48_syscall0(pid_t, gettid)
49#elif defined(__NR_gettid)
50static inline pid_t gettid(void)
51{
52 return syscall(__NR_gettid);
53}
54#else
55#warning "use pid as tid"
56static inline pid_t gettid(void)
57{
58 return getpid();
59}
60#endif
61
62#ifndef DYNAMIC_LINK_TEST
63#define _LGPL_SOURCE
64#else
1de4df4b 65#define rcu_debug_yield_read()
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66#endif
67#include <urcu.h>
68
69struct test_array {
70 int a;
71};
72
73static volatile int test_go, test_stop;
74
75static unsigned long wdelay;
76
77static struct test_array *test_rcu_pointer;
78
79static unsigned long duration;
80
81/* read-side C.S. duration, in loops */
82static unsigned long rduration;
83
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84/* write-side C.S. duration, in loops */
85static unsigned long wduration;
86
ab0aacbe 87static inline void loop_sleep(unsigned long loops)
074d8438 88{
ab0aacbe 89 while (loops-- != 0)
06f22bdb 90 caa_cpu_relax();
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91}
92
93static int verbose_mode;
94
95#define printf_verbose(fmt, args...) \
96 do { \
97 if (verbose_mode) \
98 printf(fmt, args); \
99 } while (0)
100
101static unsigned int cpu_affinities[NR_CPUS];
102static unsigned int next_aff = 0;
103static int use_affinity = 0;
104
105pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
106
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107#ifndef HAVE_CPU_SET_T
108typedef unsigned long cpu_set_t;
109# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
110# define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
111#endif
112
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113static void set_affinity(void)
114{
95bc7fb9 115#if HAVE_SCHED_SETAFFINITY
074d8438 116 cpu_set_t mask;
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117 int cpu, ret;
118#endif /* HAVE_SCHED_SETAFFINITY */
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119
120 if (!use_affinity)
121 return;
122
d8540fc5 123#if HAVE_SCHED_SETAFFINITY
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124 ret = pthread_mutex_lock(&affinity_mutex);
125 if (ret) {
126 perror("Error in pthread mutex lock");
127 exit(-1);
128 }
129 cpu = cpu_affinities[next_aff++];
130 ret = pthread_mutex_unlock(&affinity_mutex);
131 if (ret) {
132 perror("Error in pthread mutex unlock");
133 exit(-1);
134 }
d8540fc5 135
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136 CPU_ZERO(&mask);
137 CPU_SET(cpu, &mask);
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138#if SCHED_SETAFFINITY_ARGS == 2
139 sched_setaffinity(0, &mask);
140#else
074d8438 141 sched_setaffinity(0, sizeof(mask), &mask);
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142#endif
143#endif /* HAVE_SCHED_SETAFFINITY */
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144}
145
146/*
147 * returns 0 if test should end.
148 */
149static int test_duration_write(void)
150{
151 return !test_stop;
152}
153
154static int test_duration_read(void)
155{
156 return !test_stop;
157}
158
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159static DEFINE_URCU_TLS(unsigned long long, nr_writes);
160static DEFINE_URCU_TLS(unsigned long long, nr_reads);
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161
162static unsigned int nr_readers;
163static unsigned int nr_writers;
164
165pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
166
167void rcu_copy_mutex_lock(void)
168{
169 int ret;
170 ret = pthread_mutex_lock(&rcu_copy_mutex);
171 if (ret) {
172 perror("Error in pthread mutex lock");
173 exit(-1);
174 }
175}
176
177void rcu_copy_mutex_unlock(void)
178{
179 int ret;
180
181 ret = pthread_mutex_unlock(&rcu_copy_mutex);
182 if (ret) {
183 perror("Error in pthread mutex unlock");
184 exit(-1);
185 }
186}
187
188/*
189 * malloc/free are reusing memory areas too quickly, which does not let us
190 * test races appropriately. Use a large circular array for allocations.
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191 * ARRAY_SIZE is larger than nr_writers, and we keep the mutex across
192 * both alloc and free, which insures we never run over our tail.
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193 */
194#define ARRAY_SIZE (1048576 * nr_writers)
195#define ARRAY_POISON 0xDEADBEEF
196static int array_index;
197static struct test_array *test_array;
198
199static struct test_array *test_array_alloc(void)
200{
201 struct test_array *ret;
202 int index;
203
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204 index = array_index % ARRAY_SIZE;
205 assert(test_array[index].a == ARRAY_POISON ||
206 test_array[index].a == 0);
207 ret = &test_array[index];
208 array_index++;
209 if (array_index == ARRAY_SIZE)
210 array_index = 0;
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211 return ret;
212}
213
214static void test_array_free(struct test_array *ptr)
215{
216 if (!ptr)
217 return;
074d8438 218 ptr->a = ARRAY_POISON;
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219}
220
221void *thr_reader(void *_count)
222{
223 unsigned long long *count = _count;
224 struct test_array *local_ptr;
225
226 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
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227 "reader", (unsigned long) pthread_self(),
228 (unsigned long) gettid());
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229
230 set_affinity();
231
232 rcu_register_thread();
233
234 while (!test_go)
235 {
236 }
5481ddb3 237 cmm_smp_mb();
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238
239 for (;;) {
240 rcu_read_lock();
241 local_ptr = rcu_dereference(test_rcu_pointer);
1de4df4b 242 rcu_debug_yield_read();
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243 if (local_ptr)
244 assert(local_ptr->a == 8);
a0b7f7ea 245 if (caa_unlikely(rduration))
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246 loop_sleep(rduration);
247 rcu_read_unlock();
bd252a04 248 URCU_TLS(nr_reads)++;
a0b7f7ea 249 if (caa_unlikely(!test_duration_read()))
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250 break;
251 }
252
253 rcu_unregister_thread();
254
bd252a04 255 *count = URCU_TLS(nr_reads);
074d8438 256 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
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257 "reader", (unsigned long) pthread_self(),
258 (unsigned long) gettid());
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259 return ((void*)1);
260
261}
262
263void *thr_writer(void *_count)
264{
265 unsigned long long *count = _count;
266 struct test_array *new, *old;
267
268 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
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269 "writer", (unsigned long) pthread_self(),
270 (unsigned long) gettid());
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271
272 set_affinity();
273
274 while (!test_go)
275 {
276 }
5481ddb3 277 cmm_smp_mb();
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278
279 for (;;) {
d4267b0b 280 rcu_copy_mutex_lock();
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281 new = test_array_alloc();
282 new->a = 8;
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283 old = test_rcu_pointer;
284 rcu_assign_pointer(test_rcu_pointer, new);
a0b7f7ea 285 if (caa_unlikely(wduration))
31b598e0 286 loop_sleep(wduration);
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287 synchronize_rcu();
288 if (old)
289 old->a = 0;
290 test_array_free(old);
d4267b0b 291 rcu_copy_mutex_unlock();
bd252a04 292 URCU_TLS(nr_writes)++;
a0b7f7ea 293 if (caa_unlikely(!test_duration_write()))
074d8438 294 break;
a0b7f7ea 295 if (caa_unlikely(wdelay))
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296 loop_sleep(wdelay);
297 }
298
299 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
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300 "writer", (unsigned long) pthread_self(),
301 (unsigned long) gettid());
bd252a04 302 *count = URCU_TLS(nr_writes);
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303 return ((void*)2);
304}
305
306void show_usage(int argc, char **argv)
307{
308 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
309#ifdef DEBUG_YIELD
310 printf(" [-r] [-w] (yield reader and/or writer)");
311#endif
312 printf(" [-d delay] (writer period (us))");
313 printf(" [-c duration] (reader C.S. duration (in loops))");
31b598e0 314 printf(" [-e duration] (writer C.S. duration (in loops))");
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315 printf(" [-v] (verbose output)");
316 printf(" [-a cpu#] [-a cpu#]... (affinity)");
317 printf("\n");
318}
319
320int main(int argc, char **argv)
321{
322 int err;
323 pthread_t *tid_reader, *tid_writer;
324 void *tret;
325 unsigned long long *count_reader, *count_writer;
326 unsigned long long tot_reads = 0, tot_writes = 0;
327 int i, a;
328
329 if (argc < 4) {
330 show_usage(argc, argv);
331 return -1;
332 }
333
334 err = sscanf(argv[1], "%u", &nr_readers);
335 if (err != 1) {
336 show_usage(argc, argv);
337 return -1;
338 }
339
340 err = sscanf(argv[2], "%u", &nr_writers);
341 if (err != 1) {
342 show_usage(argc, argv);
343 return -1;
344 }
345
346 err = sscanf(argv[3], "%lu", &duration);
347 if (err != 1) {
348 show_usage(argc, argv);
349 return -1;
350 }
351
352 for (i = 4; i < argc; i++) {
353 if (argv[i][0] != '-')
354 continue;
355 switch (argv[i][1]) {
356#ifdef DEBUG_YIELD
357 case 'r':
1de4df4b 358 rcu_yield_active |= RCU_YIELD_READ;
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359 break;
360 case 'w':
1de4df4b 361 rcu_yield_active |= RCU_YIELD_WRITE;
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362 break;
363#endif
364 case 'a':
365 if (argc < i + 2) {
366 show_usage(argc, argv);
367 return -1;
368 }
369 a = atoi(argv[++i]);
370 cpu_affinities[next_aff++] = a;
371 use_affinity = 1;
372 printf_verbose("Adding CPU %d affinity\n", a);
373 break;
374 case 'c':
375 if (argc < i + 2) {
376 show_usage(argc, argv);
377 return -1;
378 }
379 rduration = atol(argv[++i]);
380 break;
381 case 'd':
382 if (argc < i + 2) {
383 show_usage(argc, argv);
384 return -1;
385 }
386 wdelay = atol(argv[++i]);
387 break;
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388 case 'e':
389 if (argc < i + 2) {
390 show_usage(argc, argv);
391 return -1;
392 }
393 wduration = atol(argv[++i]);
394 break;
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395 case 'v':
396 verbose_mode = 1;
397 break;
398 }
399 }
400
401 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
402 duration, nr_readers, nr_writers);
403 printf_verbose("Writer delay : %lu loops.\n", wdelay);
404 printf_verbose("Reader duration : %lu loops.\n", rduration);
405 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
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406 "main", (unsigned long) pthread_self(),
407 (unsigned long) gettid());
074d8438 408
92e8d9d6 409 test_array = calloc(1, sizeof(*test_array) * ARRAY_SIZE);
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410 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
411 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
412 count_reader = malloc(sizeof(*count_reader) * nr_readers);
413 count_writer = malloc(sizeof(*count_writer) * nr_writers);
414
415 next_aff = 0;
416
417 for (i = 0; i < nr_readers; i++) {
418 err = pthread_create(&tid_reader[i], NULL, thr_reader,
419 &count_reader[i]);
420 if (err != 0)
421 exit(1);
422 }
423 for (i = 0; i < nr_writers; i++) {
424 err = pthread_create(&tid_writer[i], NULL, thr_writer,
425 &count_writer[i]);
426 if (err != 0)
427 exit(1);
428 }
429
5481ddb3 430 cmm_smp_mb();
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431
432 test_go = 1;
433
434 sleep(duration);
435
436 test_stop = 1;
437
438 for (i = 0; i < nr_readers; i++) {
439 err = pthread_join(tid_reader[i], &tret);
440 if (err != 0)
441 exit(1);
442 tot_reads += count_reader[i];
443 }
444 for (i = 0; i < nr_writers; i++) {
445 err = pthread_join(tid_writer[i], &tret);
446 if (err != 0)
447 exit(1);
448 tot_writes += count_writer[i];
449 }
450
451 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
452 tot_writes);
a50a7b43 453 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
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454 "nr_writers %3u "
455 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
a50a7b43 456 argv[0], duration, nr_readers, rduration, wduration,
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457 nr_writers, wdelay, tot_reads, tot_writes,
458 tot_reads + tot_writes);
459 test_array_free(test_rcu_pointer);
460 free(test_array);
461 free(tid_reader);
462 free(tid_writer);
463 free(count_reader);
464 free(count_writer);
465 return 0;
466}
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