Deferral test update
[urcu.git] / tests / test_urcu_defer.c
CommitLineData
90075a50 1/*
786ee85b 2 * test_urcu_defer.c
90075a50
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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)
47static inline pid_t gettid(void)
48{
49 return syscall(__NR_gettid);
50}
51#else
52#warning "use pid as tid"
53static 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"
786ee85b 65#include "../urcu-defer.h"
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66
67struct test_array {
68 int a;
69};
70
71static volatile int test_go, test_stop;
72
73static unsigned long wdelay;
74
75static struct test_array *test_rcu_pointer;
76
77static unsigned long duration;
78
79/* read-side C.S. duration, in loops */
80static unsigned long rduration;
81
82static inline void loop_sleep(unsigned long l)
83{
84 while(l-- != 0)
85 cpu_relax();
86}
87
88static int verbose_mode;
89
90#define printf_verbose(fmt, args...) \
91 do { \
92 if (verbose_mode) \
93 printf(fmt, args); \
94 } while (0)
95
96static unsigned int cpu_affinities[NR_CPUS];
97static unsigned int next_aff = 0;
98static int use_affinity = 0;
99
100pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
101
102static 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 */
130static int test_duration_write(void)
131{
132 return !test_stop;
133}
134
135static int test_duration_read(void)
136{
137 return !test_stop;
138}
139
140static unsigned long long __thread nr_writes;
141static unsigned long long __thread nr_reads;
142
143static
144unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes;
145
146static unsigned int nr_readers;
147static unsigned int nr_writers;
148
149pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
150
151void 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
161void 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
172void *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
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212static void test_cb2(void *data)
213{
214}
215
216static void test_cb1(void *data)
217{
218}
219
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220void *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
786ee85b 230 rcu_defer_register_thread();
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MD
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);
804b4375 241 call_rcu(free, old);
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242 call_rcu(test_cb1, old);
243 call_rcu(test_cb1, (void *)-2L);
244 call_rcu(test_cb1, (void *)-2L);
245 call_rcu(test_cb1, old);
246 call_rcu(test_cb2, (void *)-2L);
804b4375 247 call_rcu(test_cb2, (void *)-4L);
48f9433c 248 call_rcu(test_cb2, (void *)-2L);
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MD
249 nr_writes++;
250 if (unlikely(!test_duration_write()))
251 break;
252 if (unlikely(wdelay))
253 loop_sleep(wdelay);
254 }
255
786ee85b 256 rcu_defer_unregister_thread();
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257
258 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
259 "writer", pthread_self(), (unsigned long)gettid());
260 tot_nr_writes[wtidx] = nr_writes;
261 return ((void*)2);
262}
263
264void show_usage(int argc, char **argv)
265{
266 printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
267#ifdef DEBUG_YIELD
268 printf(" [-r] [-w] (yield reader and/or writer)");
269#endif
270 printf(" [-d delay] (writer period (us))");
271 printf(" [-c duration] (reader C.S. duration (in loops))");
272 printf(" [-v] (verbose output)");
273 printf(" [-a cpu#] [-a cpu#]... (affinity)");
274 printf("\n");
275}
276
277int main(int argc, char **argv)
278{
279 int err;
280 pthread_t *tid_reader, *tid_writer;
281 void *tret;
282 unsigned long long *count_reader;
283 unsigned long long tot_reads = 0, tot_writes = 0;
284 int i, a;
285
286 if (argc < 4) {
287 show_usage(argc, argv);
288 return -1;
289 }
290
291 err = sscanf(argv[1], "%u", &nr_readers);
292 if (err != 1) {
293 show_usage(argc, argv);
294 return -1;
295 }
296
297 err = sscanf(argv[2], "%u", &nr_writers);
298 if (err != 1) {
299 show_usage(argc, argv);
300 return -1;
301 }
302
303 err = sscanf(argv[3], "%lu", &duration);
304 if (err != 1) {
305 show_usage(argc, argv);
306 return -1;
307 }
308
309 for (i = 4; i < argc; i++) {
310 if (argv[i][0] != '-')
311 continue;
312 switch (argv[i][1]) {
313#ifdef DEBUG_YIELD
314 case 'r':
315 yield_active |= YIELD_READ;
316 break;
317 case 'w':
318 yield_active |= YIELD_WRITE;
319 break;
320#endif
321 case 'a':
322 if (argc < i + 2) {
323 show_usage(argc, argv);
324 return -1;
325 }
326 a = atoi(argv[++i]);
327 cpu_affinities[next_aff++] = a;
328 use_affinity = 1;
329 printf_verbose("Adding CPU %d affinity\n", a);
330 break;
331 case 'c':
332 if (argc < i + 2) {
333 show_usage(argc, argv);
334 return -1;
335 }
336 rduration = atol(argv[++i]);
337 break;
338 case 'd':
339 if (argc < i + 2) {
340 show_usage(argc, argv);
341 return -1;
342 }
343 wdelay = atol(argv[++i]);
344 break;
345 case 'v':
346 verbose_mode = 1;
347 break;
348 }
349 }
350
351 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
352 duration, nr_readers, nr_writers);
353 printf_verbose("Writer delay : %lu loops.\n", wdelay);
354 printf_verbose("Reader duration : %lu loops.\n", rduration);
355 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
356 "main", pthread_self(), (unsigned long)gettid());
357
358 tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
359 tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
360 count_reader = malloc(sizeof(*count_reader) * nr_readers);
361 tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
362
363 next_aff = 0;
364
365 for (i = 0; i < nr_readers; i++) {
366 err = pthread_create(&tid_reader[i], NULL, thr_reader,
367 &count_reader[i]);
368 if (err != 0)
369 exit(1);
370 }
371 for (i = 0; i < nr_writers; i++) {
372 err = pthread_create(&tid_writer[i], NULL, thr_writer,
373 (void *)(long)i);
374 if (err != 0)
375 exit(1);
376 }
377
378 smp_mb();
379
380 test_go = 1;
381
382 sleep(duration);
383
384 test_stop = 1;
385
386 for (i = 0; i < nr_readers; i++) {
387 err = pthread_join(tid_reader[i], &tret);
388 if (err != 0)
389 exit(1);
390 tot_reads += count_reader[i];
391 }
392 for (i = 0; i < nr_writers; i++) {
393 err = pthread_join(tid_writer[i], &tret);
394 if (err != 0)
395 exit(1);
396 tot_writes += tot_nr_writes[i];
397 }
398
399 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
400 tot_writes);
401 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
402 "nr_writers %3u "
403 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
404 argv[0], duration, nr_readers, rduration,
405 nr_writers, wdelay, tot_reads, tot_writes,
406 tot_reads + tot_writes);
407 free(tid_reader);
408 free(tid_writer);
409 free(count_reader);
410 free(tot_nr_writes);
411
412 return 0;
413}
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