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de10a585 MD |
1 | /* |
2 | * test_urcu.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 | #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 <sched.h> | |
35 | #include <errno.h> | |
36 | ||
37 | #include <urcu/arch.h> | |
bd252a04 | 38 | #include <urcu/tls-compat.h> |
de10a585 MD |
39 | |
40 | #ifdef __linux__ | |
41 | #include <syscall.h> | |
42 | #endif | |
43 | ||
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) | |
50 | static inline pid_t gettid(void) | |
51 | { | |
52 | return syscall(__NR_gettid); | |
53 | } | |
54 | #else | |
55 | #warning "use pid as tid" | |
56 | static inline pid_t gettid(void) | |
57 | { | |
58 | return getpid(); | |
59 | } | |
60 | #endif | |
61 | ||
62 | #ifndef DYNAMIC_LINK_TEST | |
63 | #define _LGPL_SOURCE | |
64 | #else | |
65 | #define debug_yield_read() | |
66 | #endif | |
67 | #include "urcu-qsbr.h" | |
68 | ||
69 | struct test_array { | |
70 | int a; | |
71 | }; | |
72 | ||
73 | static volatile int test_go, test_stop; | |
74 | ||
75 | static unsigned long wdelay; | |
76 | ||
77 | static struct test_array *test_rcu_pointer; | |
78 | ||
79 | static unsigned long duration; | |
80 | ||
81 | /* read-side C.S. duration, in loops */ | |
82 | static unsigned long rduration; | |
83 | ||
84 | /* write-side C.S. duration, in loops */ | |
85 | static unsigned long wduration; | |
86 | ||
87 | static inline void loop_sleep(unsigned long l) | |
88 | { | |
89 | while(l-- != 0) | |
90 | caa_cpu_relax(); | |
91 | } | |
92 | ||
93 | static int verbose_mode; | |
94 | ||
95 | #define printf_verbose(fmt, args...) \ | |
96 | do { \ | |
97 | if (verbose_mode) \ | |
98 | printf(fmt, args); \ | |
99 | } while (0) | |
100 | ||
101 | static unsigned int cpu_affinities[NR_CPUS]; | |
102 | static unsigned int next_aff = 0; | |
103 | static int use_affinity = 0; | |
104 | ||
105 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; | |
106 | ||
107 | #ifndef HAVE_CPU_SET_T | |
108 | typedef 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 | ||
113 | static void set_affinity(void) | |
114 | { | |
115 | cpu_set_t mask; | |
116 | int cpu; | |
117 | int ret; | |
118 | ||
119 | if (!use_affinity) | |
120 | return; | |
121 | ||
122 | #if HAVE_SCHED_SETAFFINITY | |
123 | ret = pthread_mutex_lock(&affinity_mutex); | |
124 | if (ret) { | |
125 | perror("Error in pthread mutex lock"); | |
126 | exit(-1); | |
127 | } | |
128 | cpu = cpu_affinities[next_aff++]; | |
129 | ret = pthread_mutex_unlock(&affinity_mutex); | |
130 | if (ret) { | |
131 | perror("Error in pthread mutex unlock"); | |
132 | exit(-1); | |
133 | } | |
134 | CPU_ZERO(&mask); | |
135 | CPU_SET(cpu, &mask); | |
136 | #if SCHED_SETAFFINITY_ARGS == 2 | |
137 | sched_setaffinity(0, &mask); | |
138 | #else | |
139 | sched_setaffinity(0, sizeof(mask), &mask); | |
140 | #endif | |
141 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
142 | } | |
143 | ||
144 | /* | |
145 | * returns 0 if test should end. | |
146 | */ | |
147 | static int test_duration_write(void) | |
148 | { | |
149 | return !test_stop; | |
150 | } | |
151 | ||
152 | static int test_duration_read(void) | |
153 | { | |
154 | return !test_stop; | |
155 | } | |
156 | ||
bd252a04 MD |
157 | static DEFINE_URCU_TLS(unsigned long long, nr_writes); |
158 | static DEFINE_URCU_TLS(unsigned long long, nr_reads); | |
de10a585 MD |
159 | |
160 | static unsigned int nr_readers; | |
161 | static unsigned int nr_writers; | |
162 | ||
163 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
164 | ||
165 | void rcu_copy_mutex_lock(void) | |
166 | { | |
167 | int ret; | |
168 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
169 | if (ret) { | |
170 | perror("Error in pthread mutex lock"); | |
171 | exit(-1); | |
172 | } | |
173 | } | |
174 | ||
175 | void rcu_copy_mutex_unlock(void) | |
176 | { | |
177 | int ret; | |
178 | ||
179 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
180 | if (ret) { | |
181 | perror("Error in pthread mutex unlock"); | |
182 | exit(-1); | |
183 | } | |
184 | } | |
185 | ||
186 | /* | |
187 | * malloc/free are reusing memory areas too quickly, which does not let us | |
188 | * test races appropriately. Use a large circular array for allocations. | |
189 | * ARRAY_SIZE is larger than nr_writers, and we keep the mutex across | |
190 | * both alloc and free, which insures we never run over our tail. | |
191 | */ | |
192 | #define ARRAY_SIZE (1048576 * nr_writers) | |
193 | #define ARRAY_POISON 0xDEADBEEF | |
194 | static int array_index; | |
195 | static struct test_array *test_array; | |
196 | ||
197 | static struct test_array *test_array_alloc(void) | |
198 | { | |
199 | struct test_array *ret; | |
200 | int index; | |
201 | ||
202 | index = array_index % ARRAY_SIZE; | |
203 | assert(test_array[index].a == ARRAY_POISON || | |
204 | test_array[index].a == 0); | |
205 | ret = &test_array[index]; | |
206 | array_index++; | |
207 | if (array_index == ARRAY_SIZE) | |
208 | array_index = 0; | |
209 | return ret; | |
210 | } | |
211 | ||
212 | static void test_array_free(struct test_array *ptr) | |
213 | { | |
214 | if (!ptr) | |
215 | return; | |
216 | ptr->a = ARRAY_POISON; | |
217 | } | |
218 | ||
219 | void *thr_reader(void *_count) | |
220 | { | |
221 | unsigned long long *count = _count; | |
222 | struct test_array *local_ptr; | |
223 | ||
224 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
225 | "reader", pthread_self(), (unsigned long)gettid()); | |
226 | ||
227 | set_affinity(); | |
228 | ||
229 | rcu_register_thread(); | |
230 | ||
231 | while (!test_go) | |
232 | { | |
233 | } | |
234 | cmm_smp_mb(); | |
235 | ||
236 | for (;;) { | |
237 | rcu_read_lock(); | |
238 | local_ptr = rcu_dereference(test_rcu_pointer); | |
239 | debug_yield_read(); | |
240 | if (local_ptr) | |
241 | assert(local_ptr->a == 8); | |
a0b7f7ea | 242 | if (caa_unlikely(rduration)) |
de10a585 MD |
243 | loop_sleep(rduration); |
244 | rcu_read_unlock(); | |
bd252a04 | 245 | URCU_TLS(nr_reads)++; |
de10a585 | 246 | /* QS each 1024 reads */ |
bd252a04 | 247 | if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0)) |
de10a585 | 248 | rcu_quiescent_state(); |
a0b7f7ea | 249 | if (caa_unlikely(!test_duration_read())) |
de10a585 MD |
250 | break; |
251 | } | |
252 | ||
253 | rcu_unregister_thread(); | |
254 | ||
255 | /* test extra thread registration */ | |
256 | rcu_register_thread(); | |
257 | rcu_unregister_thread(); | |
258 | ||
bd252a04 | 259 | *count = URCU_TLS(nr_reads); |
de10a585 MD |
260 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
261 | "reader", pthread_self(), (unsigned long)gettid()); | |
262 | return ((void*)1); | |
263 | ||
264 | } | |
265 | ||
266 | void *thr_writer(void *_count) | |
267 | { | |
268 | unsigned long long *count = _count; | |
269 | struct test_array *new, *old; | |
270 | ||
271 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
272 | "writer", pthread_self(), (unsigned long)gettid()); | |
273 | ||
274 | set_affinity(); | |
275 | ||
276 | while (!test_go) | |
277 | { | |
278 | } | |
279 | cmm_smp_mb(); | |
280 | ||
281 | for (;;) { | |
282 | rcu_copy_mutex_lock(); | |
283 | new = test_array_alloc(); | |
284 | new->a = 8; | |
285 | old = rcu_xchg_pointer(&test_rcu_pointer, new); | |
a0b7f7ea | 286 | if (caa_unlikely(wduration)) |
de10a585 MD |
287 | loop_sleep(wduration); |
288 | synchronize_rcu(); | |
289 | /* can be done after unlock */ | |
290 | if (old) | |
291 | old->a = 0; | |
292 | test_array_free(old); | |
293 | rcu_copy_mutex_unlock(); | |
bd252a04 | 294 | URCU_TLS(nr_writes)++; |
a0b7f7ea | 295 | if (caa_unlikely(!test_duration_write())) |
de10a585 | 296 | break; |
a0b7f7ea | 297 | if (caa_unlikely(wdelay)) |
de10a585 MD |
298 | loop_sleep(wdelay); |
299 | } | |
300 | ||
301 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
302 | "writer", pthread_self(), (unsigned long)gettid()); | |
bd252a04 | 303 | *count = URCU_TLS(nr_writes); |
de10a585 MD |
304 | return ((void*)2); |
305 | } | |
306 | ||
307 | void show_usage(int argc, char **argv) | |
308 | { | |
309 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
310 | #ifdef DEBUG_YIELD | |
311 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
312 | #endif | |
313 | printf(" [-d delay] (writer period (us))"); | |
314 | printf(" [-c duration] (reader C.S. duration (in loops))"); | |
315 | printf(" [-e duration] (writer C.S. duration (in loops))"); | |
316 | printf(" [-v] (verbose output)"); | |
317 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); | |
318 | printf("\n"); | |
319 | } | |
320 | ||
321 | int main(int argc, char **argv) | |
322 | { | |
323 | int err; | |
324 | pthread_t *tid_reader, *tid_writer; | |
325 | void *tret; | |
326 | unsigned long long *count_reader, *count_writer; | |
327 | unsigned long long tot_reads = 0, tot_writes = 0; | |
328 | int i, a; | |
329 | ||
330 | if (argc < 4) { | |
331 | show_usage(argc, argv); | |
332 | return -1; | |
333 | } | |
334 | ||
335 | err = sscanf(argv[1], "%u", &nr_readers); | |
336 | if (err != 1) { | |
337 | show_usage(argc, argv); | |
338 | return -1; | |
339 | } | |
340 | ||
341 | err = sscanf(argv[2], "%u", &nr_writers); | |
342 | if (err != 1) { | |
343 | show_usage(argc, argv); | |
344 | return -1; | |
345 | } | |
346 | ||
347 | err = sscanf(argv[3], "%lu", &duration); | |
348 | if (err != 1) { | |
349 | show_usage(argc, argv); | |
350 | return -1; | |
351 | } | |
352 | ||
353 | for (i = 4; i < argc; i++) { | |
354 | if (argv[i][0] != '-') | |
355 | continue; | |
356 | switch (argv[i][1]) { | |
357 | #ifdef DEBUG_YIELD | |
358 | case 'r': | |
359 | yield_active |= YIELD_READ; | |
360 | break; | |
361 | case 'w': | |
362 | yield_active |= YIELD_WRITE; | |
363 | break; | |
364 | #endif | |
365 | case 'a': | |
366 | if (argc < i + 2) { | |
367 | show_usage(argc, argv); | |
368 | return -1; | |
369 | } | |
370 | a = atoi(argv[++i]); | |
371 | cpu_affinities[next_aff++] = a; | |
372 | use_affinity = 1; | |
373 | printf_verbose("Adding CPU %d affinity\n", a); | |
374 | break; | |
375 | case 'c': | |
376 | if (argc < i + 2) { | |
377 | show_usage(argc, argv); | |
378 | return -1; | |
379 | } | |
380 | rduration = atol(argv[++i]); | |
381 | break; | |
382 | case 'd': | |
383 | if (argc < i + 2) { | |
384 | show_usage(argc, argv); | |
385 | return -1; | |
386 | } | |
387 | wdelay = atol(argv[++i]); | |
388 | break; | |
389 | case 'e': | |
390 | if (argc < i + 2) { | |
391 | show_usage(argc, argv); | |
392 | return -1; | |
393 | } | |
394 | wduration = atol(argv[++i]); | |
395 | break; | |
396 | case 'v': | |
397 | verbose_mode = 1; | |
398 | break; | |
399 | } | |
400 | } | |
401 | ||
402 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", | |
403 | duration, nr_readers, nr_writers); | |
404 | printf_verbose("Writer delay : %lu loops.\n", wdelay); | |
405 | printf_verbose("Reader duration : %lu loops.\n", rduration); | |
406 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
407 | "main", pthread_self(), (unsigned long)gettid()); | |
408 | ||
409 | test_array = calloc(1, sizeof(*test_array) * ARRAY_SIZE); | |
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 | ||
430 | cmm_smp_mb(); | |
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); | |
453 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu " | |
454 | "nr_writers %3u " | |
455 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", | |
456 | argv[0], duration, nr_readers, rduration, wduration, | |
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 | } |