Cleanup: enable signed/unsigned compare compiler warning
[urcu.git] / tests / benchmark / test_urcu_assign.c
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CommitLineData
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
48struct test_array {
49 int a;
50};
51
52static volatile int test_go, test_stop;
53
54static unsigned long wdelay;
55
56static struct test_array *test_rcu_pointer;
57
58static unsigned long duration;
59
60/* read-side C.S. duration, in loops */
61static unsigned long rduration;
62
63/* write-side C.S. duration, in loops */
64static unsigned long wduration;
65
66static inline void loop_sleep(unsigned long loops)
67{
68 while (loops-- != 0)
69 caa_cpu_relax();
70}
71
72static int verbose_mode;
73
74#define printf_verbose(fmt, args...) \
75 do { \
76 if (verbose_mode) \
77 printf(fmt, args); \
78 } while (0)
79
80static unsigned int cpu_affinities[NR_CPUS];
81static unsigned int next_aff = 0;
82static int use_affinity = 0;
83
84pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
85
86static 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 */
122static int test_duration_write(void)
123{
124 return !test_stop;
125}
126
127static int test_duration_read(void)
128{
129 return !test_stop;
130}
131
132static DEFINE_URCU_TLS(unsigned long long, nr_writes);
133static DEFINE_URCU_TLS(unsigned long long, nr_reads);
134
135static unsigned int nr_readers;
136static unsigned int nr_writers;
137
138pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
139
140void 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
150void 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 (int) 0xDEADBEEF
169static unsigned int array_index;
170static struct test_array *test_array;
171
172static 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
187static void test_array_free(struct test_array *ptr)
188{
189 if (!ptr)
190 return;
191 ptr->a = ARRAY_POISON;
192}
193
194void *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
234void *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
275void 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
289int 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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