tests urcu bp: use lib rather than recompile source
[urcu.git] / tests / benchmark / 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
f5ab766e 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>
94b343fd 34#include <errno.h>
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35
36#include <urcu/arch.h>
bd252a04 37#include <urcu/tls-compat.h>
2953b501 38#include "cpuset.h"
94df6318 39#include "thread-id.h"
65fcc7e9 40
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41/* hardcoded number of CPUs */
42#define NR_CPUS 16384
43
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44#ifndef DYNAMIC_LINK_TEST
45#define _LGPL_SOURCE
46#else
1de4df4b 47#define rcu_debug_yield_read()
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48#endif
49#include <urcu.h>
50
51struct test_array {
52 int a;
53};
54
55static volatile int test_go, test_stop;
56
57static unsigned long wdelay;
58
59static struct test_array *test_rcu_pointer;
60
61static unsigned long duration;
62
63/* read-side C.S. duration, in loops */
64static unsigned long rduration;
65
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66/* write-side C.S. duration, in loops */
67static unsigned long wduration;
68
ab0aacbe 69static inline void loop_sleep(unsigned long loops)
074d8438 70{
ab0aacbe 71 while (loops-- != 0)
06f22bdb 72 caa_cpu_relax();
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73}
74
75static int verbose_mode;
76
77#define printf_verbose(fmt, args...) \
78 do { \
79 if (verbose_mode) \
80 printf(fmt, args); \
81 } while (0)
82
83static unsigned int cpu_affinities[NR_CPUS];
84static unsigned int next_aff = 0;
85static int use_affinity = 0;
86
87pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
88
89static void set_affinity(void)
90{
95bc7fb9 91#if HAVE_SCHED_SETAFFINITY
074d8438 92 cpu_set_t mask;
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93 int cpu, ret;
94#endif /* HAVE_SCHED_SETAFFINITY */
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95
96 if (!use_affinity)
97 return;
98
d8540fc5 99#if HAVE_SCHED_SETAFFINITY
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100 ret = pthread_mutex_lock(&affinity_mutex);
101 if (ret) {
102 perror("Error in pthread mutex lock");
103 exit(-1);
104 }
105 cpu = cpu_affinities[next_aff++];
106 ret = pthread_mutex_unlock(&affinity_mutex);
107 if (ret) {
108 perror("Error in pthread mutex unlock");
109 exit(-1);
110 }
d8540fc5 111
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112 CPU_ZERO(&mask);
113 CPU_SET(cpu, &mask);
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114#if SCHED_SETAFFINITY_ARGS == 2
115 sched_setaffinity(0, &mask);
116#else
074d8438 117 sched_setaffinity(0, sizeof(mask), &mask);
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118#endif
119#endif /* HAVE_SCHED_SETAFFINITY */
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120}
121
122/*
123 * returns 0 if test should end.
124 */
125static int test_duration_write(void)
126{
127 return !test_stop;
128}
129
130static int test_duration_read(void)
131{
132 return !test_stop;
133}
134
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135static DEFINE_URCU_TLS(unsigned long long, nr_writes);
136static DEFINE_URCU_TLS(unsigned long long, nr_reads);
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137
138static unsigned int nr_readers;
139static unsigned int nr_writers;
140
141pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
142
143void rcu_copy_mutex_lock(void)
144{
145 int ret;
146 ret = pthread_mutex_lock(&rcu_copy_mutex);
147 if (ret) {
148 perror("Error in pthread mutex lock");
149 exit(-1);
150 }
151}
152
153void rcu_copy_mutex_unlock(void)
154{
155 int ret;
156
157 ret = pthread_mutex_unlock(&rcu_copy_mutex);
158 if (ret) {
159 perror("Error in pthread mutex unlock");
160 exit(-1);
161 }
162}
163
164/*
165 * malloc/free are reusing memory areas too quickly, which does not let us
166 * test races appropriately. Use a large circular array for allocations.
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167 * ARRAY_SIZE is larger than nr_writers, and we keep the mutex across
168 * both alloc and free, which insures we never run over our tail.
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169 */
170#define ARRAY_SIZE (1048576 * nr_writers)
171#define ARRAY_POISON 0xDEADBEEF
172static int array_index;
173static struct test_array *test_array;
174
175static struct test_array *test_array_alloc(void)
176{
177 struct test_array *ret;
178 int index;
179
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180 index = array_index % ARRAY_SIZE;
181 assert(test_array[index].a == ARRAY_POISON ||
182 test_array[index].a == 0);
183 ret = &test_array[index];
184 array_index++;
185 if (array_index == ARRAY_SIZE)
186 array_index = 0;
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187 return ret;
188}
189
190static void test_array_free(struct test_array *ptr)
191{
192 if (!ptr)
193 return;
074d8438 194 ptr->a = ARRAY_POISON;
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195}
196
197void *thr_reader(void *_count)
198{
199 unsigned long long *count = _count;
200 struct test_array *local_ptr;
201
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202 printf_verbose("thread_begin %s, tid %lu\n",
203 "reader", urcu_get_thread_id());
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204
205 set_affinity();
206
207 rcu_register_thread();
208
209 while (!test_go)
210 {
211 }
5481ddb3 212 cmm_smp_mb();
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213
214 for (;;) {
215 rcu_read_lock();
216 local_ptr = rcu_dereference(test_rcu_pointer);
1de4df4b 217 rcu_debug_yield_read();
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218 if (local_ptr)
219 assert(local_ptr->a == 8);
a0b7f7ea 220 if (caa_unlikely(rduration))
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221 loop_sleep(rduration);
222 rcu_read_unlock();
bd252a04 223 URCU_TLS(nr_reads)++;
a0b7f7ea 224 if (caa_unlikely(!test_duration_read()))
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225 break;
226 }
227
228 rcu_unregister_thread();
229
bd252a04 230 *count = URCU_TLS(nr_reads);
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231 printf_verbose("thread_end %s, tid %lu\n",
232 "reader", urcu_get_thread_id());
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233 return ((void*)1);
234
235}
236
237void *thr_writer(void *_count)
238{
239 unsigned long long *count = _count;
240 struct test_array *new, *old;
241
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242 printf_verbose("thread_begin %s, tid %lu\n",
243 "writer", urcu_get_thread_id());
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244
245 set_affinity();
246
247 while (!test_go)
248 {
249 }
5481ddb3 250 cmm_smp_mb();
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251
252 for (;;) {
d4267b0b 253 rcu_copy_mutex_lock();
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254 new = test_array_alloc();
255 new->a = 8;
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256 old = test_rcu_pointer;
257 rcu_assign_pointer(test_rcu_pointer, new);
a0b7f7ea 258 if (caa_unlikely(wduration))
31b598e0 259 loop_sleep(wduration);
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260 synchronize_rcu();
261 if (old)
262 old->a = 0;
263 test_array_free(old);
d4267b0b 264 rcu_copy_mutex_unlock();
bd252a04 265 URCU_TLS(nr_writes)++;
a0b7f7ea 266 if (caa_unlikely(!test_duration_write()))
074d8438 267 break;
a0b7f7ea 268 if (caa_unlikely(wdelay))
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269 loop_sleep(wdelay);
270 }
271
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272 printf_verbose("thread_end %s, tid %lu\n",
273 "writer", urcu_get_thread_id());
bd252a04 274 *count = URCU_TLS(nr_writes);
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275 return ((void*)2);
276}
277
278void show_usage(int argc, char **argv)
279{
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280 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
281 argv[0]);
282 printf("OPTIONS:\n");
074d8438 283#ifdef DEBUG_YIELD
06637138 284 printf(" [-r] [-w] (yield reader and/or writer)\n");
074d8438 285#endif
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286 printf(" [-d delay] (writer period (us))\n");
287 printf(" [-c duration] (reader C.S. duration (in loops))\n");
288 printf(" [-e duration] (writer C.S. duration (in loops))\n");
289 printf(" [-v] (verbose output)\n");
290 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
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291 printf("\n");
292}
293
294int main(int argc, char **argv)
295{
296 int err;
297 pthread_t *tid_reader, *tid_writer;
298 void *tret;
299 unsigned long long *count_reader, *count_writer;
300 unsigned long long tot_reads = 0, tot_writes = 0;
301 int i, a;
302
303 if (argc < 4) {
304 show_usage(argc, argv);
305 return -1;
306 }
307
308 err = sscanf(argv[1], "%u", &nr_readers);
309 if (err != 1) {
310 show_usage(argc, argv);
311 return -1;
312 }
313
314 err = sscanf(argv[2], "%u", &nr_writers);
315 if (err != 1) {
316 show_usage(argc, argv);
317 return -1;
318 }
319
320 err = sscanf(argv[3], "%lu", &duration);
321 if (err != 1) {
322 show_usage(argc, argv);
323 return -1;
324 }
325
326 for (i = 4; i < argc; i++) {
327 if (argv[i][0] != '-')
328 continue;
329 switch (argv[i][1]) {
330#ifdef DEBUG_YIELD
331 case 'r':
1de4df4b 332 rcu_yield_active |= RCU_YIELD_READ;
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333 break;
334 case 'w':
1de4df4b 335 rcu_yield_active |= RCU_YIELD_WRITE;
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336 break;
337#endif
338 case 'a':
339 if (argc < i + 2) {
340 show_usage(argc, argv);
341 return -1;
342 }
343 a = atoi(argv[++i]);
344 cpu_affinities[next_aff++] = a;
345 use_affinity = 1;
346 printf_verbose("Adding CPU %d affinity\n", a);
347 break;
348 case 'c':
349 if (argc < i + 2) {
350 show_usage(argc, argv);
351 return -1;
352 }
353 rduration = atol(argv[++i]);
354 break;
355 case 'd':
356 if (argc < i + 2) {
357 show_usage(argc, argv);
358 return -1;
359 }
360 wdelay = atol(argv[++i]);
361 break;
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362 case 'e':
363 if (argc < i + 2) {
364 show_usage(argc, argv);
365 return -1;
366 }
367 wduration = atol(argv[++i]);
368 break;
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369 case 'v':
370 verbose_mode = 1;
371 break;
372 }
373 }
374
375 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
376 duration, nr_readers, nr_writers);
377 printf_verbose("Writer delay : %lu loops.\n", wdelay);
378 printf_verbose("Reader duration : %lu loops.\n", rduration);
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379 printf_verbose("thread %-6s, tid %lu\n",
380 "main", urcu_get_thread_id());
074d8438 381
92e8d9d6 382 test_array = calloc(1, sizeof(*test_array) * ARRAY_SIZE);
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383 tid_reader = calloc(nr_readers, sizeof(*tid_reader));
384 tid_writer = calloc(nr_writers, sizeof(*tid_writer));
385 count_reader = calloc(nr_readers, sizeof(*count_reader));
386 count_writer = calloc(nr_writers, sizeof(*count_writer));
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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 &count_writer[i]);
399 if (err != 0)
400 exit(1);
401 }
402
5481ddb3 403 cmm_smp_mb();
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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 += count_writer[i];
422 }
423
424 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
425 tot_writes);
a50a7b43 426 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
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427 "nr_writers %3u "
428 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
a50a7b43 429 argv[0], duration, nr_readers, rduration, wduration,
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430 nr_writers, wdelay, tot_reads, tot_writes,
431 tot_reads + tot_writes);
432 test_array_free(test_rcu_pointer);
433 free(test_array);
434 free(tid_reader);
435 free(tid_writer);
436 free(count_reader);
437 free(count_writer);
438 return 0;
439}
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