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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 | |
1de4df4b | 65 | #define rcu_debug_yield_read() |
de10a585 MD |
66 | #endif |
67 | #include "urcu-qsbr.h" | |
68 | ||
de10a585 MD |
69 | static volatile int test_go, test_stop; |
70 | ||
71 | static unsigned long wdelay; | |
72 | ||
bcc74df3 | 73 | static int *test_rcu_pointer; |
de10a585 MD |
74 | |
75 | static unsigned long duration; | |
76 | ||
77 | /* read-side C.S. duration, in loops */ | |
78 | static unsigned long rduration; | |
79 | ||
80 | /* write-side C.S. duration, in loops */ | |
81 | static unsigned long wduration; | |
82 | ||
ab0aacbe | 83 | static inline void loop_sleep(unsigned long loops) |
de10a585 | 84 | { |
ab0aacbe | 85 | while (loops-- != 0) |
de10a585 MD |
86 | caa_cpu_relax(); |
87 | } | |
88 | ||
89 | static int verbose_mode; | |
90 | ||
91 | #define printf_verbose(fmt, args...) \ | |
92 | do { \ | |
93 | if (verbose_mode) \ | |
94 | printf(fmt, args); \ | |
95 | } while (0) | |
96 | ||
97 | static unsigned int cpu_affinities[NR_CPUS]; | |
98 | static unsigned int next_aff = 0; | |
99 | static int use_affinity = 0; | |
100 | ||
101 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; | |
102 | ||
103 | #ifndef HAVE_CPU_SET_T | |
104 | typedef unsigned long cpu_set_t; | |
105 | # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0) | |
106 | # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0) | |
107 | #endif | |
108 | ||
109 | static void set_affinity(void) | |
110 | { | |
95bc7fb9 | 111 | #if HAVE_SCHED_SETAFFINITY |
de10a585 | 112 | cpu_set_t mask; |
95bc7fb9 MD |
113 | int cpu, ret; |
114 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
de10a585 MD |
115 | |
116 | if (!use_affinity) | |
117 | return; | |
118 | ||
119 | #if HAVE_SCHED_SETAFFINITY | |
120 | ret = pthread_mutex_lock(&affinity_mutex); | |
121 | if (ret) { | |
122 | perror("Error in pthread mutex lock"); | |
123 | exit(-1); | |
124 | } | |
125 | cpu = cpu_affinities[next_aff++]; | |
126 | ret = pthread_mutex_unlock(&affinity_mutex); | |
127 | if (ret) { | |
128 | perror("Error in pthread mutex unlock"); | |
129 | exit(-1); | |
130 | } | |
131 | CPU_ZERO(&mask); | |
132 | CPU_SET(cpu, &mask); | |
133 | #if SCHED_SETAFFINITY_ARGS == 2 | |
134 | sched_setaffinity(0, &mask); | |
135 | #else | |
136 | sched_setaffinity(0, sizeof(mask), &mask); | |
137 | #endif | |
138 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
139 | } | |
140 | ||
141 | /* | |
142 | * returns 0 if test should end. | |
143 | */ | |
144 | static int test_duration_write(void) | |
145 | { | |
146 | return !test_stop; | |
147 | } | |
148 | ||
149 | static int test_duration_read(void) | |
150 | { | |
151 | return !test_stop; | |
152 | } | |
153 | ||
bd252a04 MD |
154 | static DEFINE_URCU_TLS(unsigned long long, nr_writes); |
155 | static DEFINE_URCU_TLS(unsigned long long, nr_reads); | |
de10a585 MD |
156 | |
157 | static unsigned int nr_readers; | |
158 | static unsigned int nr_writers; | |
159 | ||
160 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
161 | ||
162 | void rcu_copy_mutex_lock(void) | |
163 | { | |
164 | int ret; | |
165 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
166 | if (ret) { | |
167 | perror("Error in pthread mutex lock"); | |
168 | exit(-1); | |
169 | } | |
170 | } | |
171 | ||
172 | void rcu_copy_mutex_unlock(void) | |
173 | { | |
174 | int ret; | |
175 | ||
176 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
177 | if (ret) { | |
178 | perror("Error in pthread mutex unlock"); | |
179 | exit(-1); | |
180 | } | |
181 | } | |
182 | ||
de10a585 MD |
183 | void *thr_reader(void *_count) |
184 | { | |
185 | unsigned long long *count = _count; | |
bcc74df3 | 186 | int *local_ptr; |
de10a585 MD |
187 | |
188 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
6ff854ac MD |
189 | "reader", (unsigned long) pthread_self(), |
190 | (unsigned long) gettid()); | |
de10a585 MD |
191 | |
192 | set_affinity(); | |
193 | ||
194 | rcu_register_thread(); | |
195 | ||
196 | while (!test_go) | |
197 | { | |
198 | } | |
199 | cmm_smp_mb(); | |
200 | ||
201 | for (;;) { | |
202 | rcu_read_lock(); | |
203 | local_ptr = rcu_dereference(test_rcu_pointer); | |
1de4df4b | 204 | rcu_debug_yield_read(); |
de10a585 | 205 | if (local_ptr) |
bcc74df3 | 206 | assert(*local_ptr == 8); |
a0b7f7ea | 207 | if (caa_unlikely(rduration)) |
de10a585 MD |
208 | loop_sleep(rduration); |
209 | rcu_read_unlock(); | |
bd252a04 | 210 | URCU_TLS(nr_reads)++; |
de10a585 | 211 | /* QS each 1024 reads */ |
bd252a04 | 212 | if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0)) |
de10a585 | 213 | rcu_quiescent_state(); |
a0b7f7ea | 214 | if (caa_unlikely(!test_duration_read())) |
de10a585 MD |
215 | break; |
216 | } | |
217 | ||
218 | rcu_unregister_thread(); | |
219 | ||
220 | /* test extra thread registration */ | |
221 | rcu_register_thread(); | |
222 | rcu_unregister_thread(); | |
223 | ||
bd252a04 | 224 | *count = URCU_TLS(nr_reads); |
de10a585 | 225 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
6ff854ac MD |
226 | "reader", (unsigned long) pthread_self(), |
227 | (unsigned long) gettid()); | |
de10a585 MD |
228 | return ((void*)1); |
229 | ||
230 | } | |
231 | ||
232 | void *thr_writer(void *_count) | |
233 | { | |
234 | unsigned long long *count = _count; | |
bcc74df3 | 235 | int *new, *old; |
de10a585 MD |
236 | |
237 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", | |
6ff854ac MD |
238 | "writer", (unsigned long) pthread_self(), |
239 | (unsigned long) gettid()); | |
de10a585 MD |
240 | |
241 | set_affinity(); | |
242 | ||
243 | while (!test_go) | |
244 | { | |
245 | } | |
246 | cmm_smp_mb(); | |
247 | ||
248 | for (;;) { | |
bcc74df3 MD |
249 | new = malloc(sizeof(int)); |
250 | assert(new); | |
251 | *new = 8; | |
de10a585 | 252 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
a0b7f7ea | 253 | if (caa_unlikely(wduration)) |
de10a585 MD |
254 | loop_sleep(wduration); |
255 | synchronize_rcu(); | |
de10a585 | 256 | if (old) |
bcc74df3 MD |
257 | *old = 0; |
258 | free(old); | |
bd252a04 | 259 | URCU_TLS(nr_writes)++; |
a0b7f7ea | 260 | if (caa_unlikely(!test_duration_write())) |
de10a585 | 261 | break; |
a0b7f7ea | 262 | if (caa_unlikely(wdelay)) |
de10a585 MD |
263 | loop_sleep(wdelay); |
264 | } | |
265 | ||
266 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", | |
6ff854ac MD |
267 | "writer", (unsigned long) pthread_self(), |
268 | (unsigned long) gettid()); | |
bd252a04 | 269 | *count = URCU_TLS(nr_writes); |
de10a585 MD |
270 | return ((void*)2); |
271 | } | |
272 | ||
273 | void show_usage(int argc, char **argv) | |
274 | { | |
275 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
276 | #ifdef DEBUG_YIELD | |
277 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
278 | #endif | |
279 | printf(" [-d delay] (writer period (us))"); | |
280 | printf(" [-c duration] (reader C.S. duration (in loops))"); | |
281 | printf(" [-e duration] (writer C.S. duration (in loops))"); | |
282 | printf(" [-v] (verbose output)"); | |
283 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); | |
284 | printf("\n"); | |
285 | } | |
286 | ||
287 | int main(int argc, char **argv) | |
288 | { | |
289 | int err; | |
290 | pthread_t *tid_reader, *tid_writer; | |
291 | void *tret; | |
292 | unsigned long long *count_reader, *count_writer; | |
293 | unsigned long long tot_reads = 0, tot_writes = 0; | |
294 | int i, a; | |
295 | ||
296 | if (argc < 4) { | |
297 | show_usage(argc, argv); | |
298 | return -1; | |
299 | } | |
300 | ||
301 | err = sscanf(argv[1], "%u", &nr_readers); | |
302 | if (err != 1) { | |
303 | show_usage(argc, argv); | |
304 | return -1; | |
305 | } | |
306 | ||
307 | err = sscanf(argv[2], "%u", &nr_writers); | |
308 | if (err != 1) { | |
309 | show_usage(argc, argv); | |
310 | return -1; | |
311 | } | |
312 | ||
313 | err = sscanf(argv[3], "%lu", &duration); | |
314 | if (err != 1) { | |
315 | show_usage(argc, argv); | |
316 | return -1; | |
317 | } | |
318 | ||
319 | for (i = 4; i < argc; i++) { | |
320 | if (argv[i][0] != '-') | |
321 | continue; | |
322 | switch (argv[i][1]) { | |
323 | #ifdef DEBUG_YIELD | |
324 | case 'r': | |
1de4df4b | 325 | rcu_yield_active |= RCU_RCU_YIELD_READ; |
de10a585 MD |
326 | break; |
327 | case 'w': | |
1de4df4b | 328 | rcu_yield_active |= RCU_RCU_YIELD_WRITE; |
de10a585 MD |
329 | break; |
330 | #endif | |
331 | case 'a': | |
332 | if (argc < i + 2) { | |
333 | show_usage(argc, argv); | |
334 | return -1; | |
335 | } | |
336 | a = atoi(argv[++i]); | |
337 | cpu_affinities[next_aff++] = a; | |
338 | use_affinity = 1; | |
339 | printf_verbose("Adding CPU %d affinity\n", a); | |
340 | break; | |
341 | case 'c': | |
342 | if (argc < i + 2) { | |
343 | show_usage(argc, argv); | |
344 | return -1; | |
345 | } | |
346 | rduration = atol(argv[++i]); | |
347 | break; | |
348 | case 'd': | |
349 | if (argc < i + 2) { | |
350 | show_usage(argc, argv); | |
351 | return -1; | |
352 | } | |
353 | wdelay = atol(argv[++i]); | |
354 | break; | |
355 | case 'e': | |
356 | if (argc < i + 2) { | |
357 | show_usage(argc, argv); | |
358 | return -1; | |
359 | } | |
360 | wduration = atol(argv[++i]); | |
361 | break; | |
362 | case 'v': | |
363 | verbose_mode = 1; | |
364 | break; | |
365 | } | |
366 | } | |
367 | ||
368 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", | |
369 | duration, nr_readers, nr_writers); | |
370 | printf_verbose("Writer delay : %lu loops.\n", wdelay); | |
371 | printf_verbose("Reader duration : %lu loops.\n", rduration); | |
372 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
6ff854ac MD |
373 | "main", (unsigned long) pthread_self(), |
374 | (unsigned long) gettid()); | |
de10a585 | 375 | |
de10a585 MD |
376 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); |
377 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
378 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
379 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
380 | ||
381 | next_aff = 0; | |
382 | ||
383 | for (i = 0; i < nr_readers; i++) { | |
384 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
385 | &count_reader[i]); | |
386 | if (err != 0) | |
387 | exit(1); | |
388 | } | |
389 | for (i = 0; i < nr_writers; i++) { | |
390 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
391 | &count_writer[i]); | |
392 | if (err != 0) | |
393 | exit(1); | |
394 | } | |
395 | ||
396 | cmm_smp_mb(); | |
397 | ||
398 | test_go = 1; | |
399 | ||
400 | sleep(duration); | |
401 | ||
402 | test_stop = 1; | |
403 | ||
404 | for (i = 0; i < nr_readers; i++) { | |
405 | err = pthread_join(tid_reader[i], &tret); | |
406 | if (err != 0) | |
407 | exit(1); | |
408 | tot_reads += count_reader[i]; | |
409 | } | |
410 | for (i = 0; i < nr_writers; i++) { | |
411 | err = pthread_join(tid_writer[i], &tret); | |
412 | if (err != 0) | |
413 | exit(1); | |
414 | tot_writes += count_writer[i]; | |
415 | } | |
416 | ||
417 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
418 | tot_writes); | |
419 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu " | |
420 | "nr_writers %3u " | |
421 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", | |
422 | argv[0], duration, nr_readers, rduration, wduration, | |
423 | nr_writers, wdelay, tot_reads, tot_writes, | |
424 | tot_reads + tot_writes); | |
bcc74df3 | 425 | free(test_rcu_pointer); |
de10a585 MD |
426 | free(tid_reader); |
427 | free(tid_writer); | |
428 | free(count_reader); | |
429 | free(count_writer); | |
430 | return 0; | |
431 | } |