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10c48e14 MD |
1 | /* |
2 | * test_urcu.c | |
3 | * | |
4 | * Userspace RCU library - test program | |
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 | ||
9e97e478 | 23 | #define _GNU_SOURCE |
10c48e14 MD |
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> | |
9e97e478 | 34 | #include <sched.h> |
94b343fd | 35 | #include <errno.h> |
10c48e14 | 36 | |
ec4e58a3 | 37 | #include <urcu/arch.h> |
7685d963 | 38 | |
2a7ac59d MD |
39 | /* hardcoded number of CPUs */ |
40 | #define NR_CPUS 16384 | |
41 | ||
10c48e14 MD |
42 | #if defined(_syscall0) |
43 | _syscall0(pid_t, gettid) | |
44 | #elif defined(__NR_gettid) | |
45 | static inline pid_t gettid(void) | |
46 | { | |
47 | return syscall(__NR_gettid); | |
48 | } | |
49 | #else | |
50 | #warning "use pid as tid" | |
51 | static inline pid_t gettid(void) | |
52 | { | |
53 | return getpid(); | |
54 | } | |
55 | #endif | |
56 | ||
57 | #ifndef DYNAMIC_LINK_TEST | |
58 | #define _LGPL_SOURCE | |
59 | #else | |
60 | #define debug_yield_read() | |
61 | #endif | |
ec4e58a3 | 62 | #include <urcu.h> |
10c48e14 MD |
63 | |
64 | struct test_array { | |
65 | int a; | |
66 | }; | |
67 | ||
68 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
69 | ||
78efb485 | 70 | static volatile int test_go, test_stop; |
10c48e14 | 71 | |
9e31d0f0 | 72 | static unsigned long wdelay; |
10c48e14 | 73 | |
2b4e4125 | 74 | static volatile struct test_array test_array = { 8 }; |
10c48e14 MD |
75 | |
76 | static unsigned long duration; | |
10c48e14 | 77 | |
daddf5b0 | 78 | /* read-side C.S. duration, in loops */ |
8b632bab MD |
79 | static unsigned long rduration; |
80 | ||
daddf5b0 MD |
81 | static inline void loop_sleep(unsigned long l) |
82 | { | |
83 | while(l-- != 0) | |
84 | cpu_relax(); | |
85 | } | |
86 | ||
4bad7d45 MD |
87 | static int verbose_mode; |
88 | ||
89 | #define printf_verbose(fmt, args...) \ | |
90 | do { \ | |
91 | if (verbose_mode) \ | |
92 | printf(fmt, args); \ | |
93 | } while (0) | |
94 | ||
2a7ac59d MD |
95 | static unsigned int cpu_affinities[NR_CPUS]; |
96 | static unsigned int next_aff = 0; | |
97 | static int use_affinity = 0; | |
98 | ||
6af882ba MD |
99 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; |
100 | ||
2a7ac59d MD |
101 | static void set_affinity(void) |
102 | { | |
103 | cpu_set_t mask; | |
104 | int cpu; | |
6af882ba | 105 | int ret; |
2a7ac59d MD |
106 | |
107 | if (!use_affinity) | |
108 | return; | |
109 | ||
6af882ba MD |
110 | ret = pthread_mutex_lock(&affinity_mutex); |
111 | if (ret) { | |
112 | perror("Error in pthread mutex lock"); | |
113 | exit(-1); | |
114 | } | |
2a7ac59d | 115 | cpu = cpu_affinities[next_aff++]; |
6af882ba MD |
116 | ret = pthread_mutex_unlock(&affinity_mutex); |
117 | if (ret) { | |
118 | perror("Error in pthread mutex unlock"); | |
119 | exit(-1); | |
120 | } | |
2a7ac59d MD |
121 | CPU_ZERO(&mask); |
122 | CPU_SET(cpu, &mask); | |
123 | sched_setaffinity(0, sizeof(mask), &mask); | |
124 | } | |
125 | ||
10c48e14 MD |
126 | /* |
127 | * returns 0 if test should end. | |
128 | */ | |
129 | static int test_duration_write(void) | |
130 | { | |
78efb485 | 131 | return !test_stop; |
10c48e14 MD |
132 | } |
133 | ||
134 | static int test_duration_read(void) | |
135 | { | |
78efb485 | 136 | return !test_stop; |
10c48e14 MD |
137 | } |
138 | ||
139 | static unsigned long long __thread nr_writes; | |
140 | static unsigned long long __thread nr_reads; | |
141 | ||
142 | static unsigned int nr_readers; | |
143 | static unsigned int nr_writers; | |
144 | ||
145 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
146 | ||
147 | void rcu_copy_mutex_lock(void) | |
148 | { | |
149 | int ret; | |
150 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
151 | if (ret) { | |
152 | perror("Error in pthread mutex lock"); | |
153 | exit(-1); | |
154 | } | |
155 | } | |
156 | ||
157 | void rcu_copy_mutex_unlock(void) | |
158 | { | |
159 | int ret; | |
160 | ||
161 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
162 | if (ret) { | |
163 | perror("Error in pthread mutex unlock"); | |
164 | exit(-1); | |
165 | } | |
166 | } | |
167 | ||
168 | void *thr_reader(void *_count) | |
169 | { | |
170 | unsigned long long *count = _count; | |
171 | ||
4bad7d45 | 172 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
10c48e14 MD |
173 | "reader", pthread_self(), (unsigned long)gettid()); |
174 | ||
2a7ac59d MD |
175 | set_affinity(); |
176 | ||
10c48e14 MD |
177 | while (!test_go) |
178 | { | |
179 | } | |
180 | ||
181 | for (;;) { | |
182 | pthread_rwlock_rdlock(&lock); | |
183 | assert(test_array.a == 8); | |
8b632bab | 184 | if (unlikely(rduration)) |
daddf5b0 | 185 | loop_sleep(rduration); |
10c48e14 MD |
186 | pthread_rwlock_unlock(&lock); |
187 | nr_reads++; | |
59d5a406 | 188 | if (unlikely(!test_duration_read())) |
10c48e14 MD |
189 | break; |
190 | } | |
191 | ||
192 | *count = nr_reads; | |
4bad7d45 | 193 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
10c48e14 MD |
194 | "reader", pthread_self(), (unsigned long)gettid()); |
195 | return ((void*)1); | |
196 | ||
197 | } | |
198 | ||
199 | void *thr_writer(void *_count) | |
200 | { | |
201 | unsigned long long *count = _count; | |
202 | ||
4bad7d45 | 203 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
10c48e14 MD |
204 | "writer", pthread_self(), (unsigned long)gettid()); |
205 | ||
2a7ac59d MD |
206 | set_affinity(); |
207 | ||
10c48e14 MD |
208 | while (!test_go) |
209 | { | |
210 | } | |
7685d963 | 211 | smp_mb(); |
10c48e14 MD |
212 | |
213 | for (;;) { | |
214 | pthread_rwlock_wrlock(&lock); | |
2b4e4125 | 215 | test_array.a = 0; |
10c48e14 MD |
216 | test_array.a = 8; |
217 | pthread_rwlock_unlock(&lock); | |
218 | nr_writes++; | |
59d5a406 | 219 | if (unlikely(!test_duration_write())) |
10c48e14 | 220 | break; |
59d5a406 | 221 | if (unlikely(wdelay)) |
9e31d0f0 | 222 | loop_sleep(wdelay); |
10c48e14 MD |
223 | } |
224 | ||
4bad7d45 | 225 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
10c48e14 MD |
226 | "writer", pthread_self(), (unsigned long)gettid()); |
227 | *count = nr_writes; | |
228 | return ((void*)2); | |
229 | } | |
230 | ||
231 | void show_usage(int argc, char **argv) | |
232 | { | |
233 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
234 | #ifdef DEBUG_YIELD | |
235 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
236 | #endif | |
7685d963 | 237 | printf(" [-d delay] (writer period (us))"); |
daddf5b0 | 238 | printf(" [-c duration] (reader C.S. duration (in loops))"); |
4bad7d45 | 239 | printf(" [-v] (verbose output)"); |
9e97e478 | 240 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); |
10c48e14 MD |
241 | printf("\n"); |
242 | } | |
243 | ||
244 | int main(int argc, char **argv) | |
245 | { | |
246 | int err; | |
247 | pthread_t *tid_reader, *tid_writer; | |
248 | void *tret; | |
249 | unsigned long long *count_reader, *count_writer; | |
250 | unsigned long long tot_reads = 0, tot_writes = 0; | |
9e97e478 | 251 | int i, a; |
10c48e14 MD |
252 | |
253 | if (argc < 4) { | |
254 | show_usage(argc, argv); | |
255 | return -1; | |
256 | } | |
7685d963 | 257 | smp_mb(); |
10c48e14 MD |
258 | |
259 | err = sscanf(argv[1], "%u", &nr_readers); | |
260 | if (err != 1) { | |
261 | show_usage(argc, argv); | |
262 | return -1; | |
263 | } | |
264 | ||
265 | err = sscanf(argv[2], "%u", &nr_writers); | |
266 | if (err != 1) { | |
267 | show_usage(argc, argv); | |
268 | return -1; | |
269 | } | |
270 | ||
271 | err = sscanf(argv[3], "%lu", &duration); | |
272 | if (err != 1) { | |
273 | show_usage(argc, argv); | |
274 | return -1; | |
275 | } | |
276 | ||
277 | for (i = 4; i < argc; i++) { | |
278 | if (argv[i][0] != '-') | |
279 | continue; | |
280 | switch (argv[i][1]) { | |
281 | #ifdef DEBUG_YIELD | |
282 | case 'r': | |
283 | yield_active |= YIELD_READ; | |
284 | break; | |
285 | case 'w': | |
286 | yield_active |= YIELD_WRITE; | |
287 | break; | |
288 | #endif | |
9e97e478 MD |
289 | case 'a': |
290 | if (argc < i + 2) { | |
291 | show_usage(argc, argv); | |
292 | return -1; | |
293 | } | |
294 | a = atoi(argv[++i]); | |
2a7ac59d | 295 | cpu_affinities[next_aff++] = a; |
9e97e478 | 296 | use_affinity = 1; |
4bad7d45 | 297 | printf_verbose("Adding CPU %d affinity\n", a); |
9e97e478 | 298 | break; |
8b632bab MD |
299 | case 'c': |
300 | if (argc < i + 2) { | |
301 | show_usage(argc, argv); | |
302 | return -1; | |
303 | } | |
9e31d0f0 | 304 | rduration = atol(argv[++i]); |
8b632bab | 305 | break; |
10c48e14 MD |
306 | case 'd': |
307 | if (argc < i + 2) { | |
308 | show_usage(argc, argv); | |
309 | return -1; | |
310 | } | |
9e31d0f0 | 311 | wdelay = atol(argv[++i]); |
10c48e14 | 312 | break; |
4bad7d45 MD |
313 | case 'v': |
314 | verbose_mode = 1; | |
315 | break; | |
10c48e14 MD |
316 | } |
317 | } | |
318 | ||
4bad7d45 | 319 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", |
10c48e14 | 320 | duration, nr_readers, nr_writers); |
9e31d0f0 | 321 | printf_verbose("Writer delay : %lu loops.\n", wdelay); |
4bad7d45 MD |
322 | printf_verbose("Reader duration : %lu loops.\n", rduration); |
323 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
10c48e14 MD |
324 | "main", pthread_self(), (unsigned long)gettid()); |
325 | ||
326 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
327 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
328 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
329 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
330 | ||
2a7ac59d MD |
331 | next_aff = 0; |
332 | ||
10c48e14 MD |
333 | for (i = 0; i < nr_readers; i++) { |
334 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
335 | &count_reader[i]); | |
336 | if (err != 0) | |
337 | exit(1); | |
338 | } | |
339 | for (i = 0; i < nr_writers; i++) { | |
340 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
341 | &count_writer[i]); | |
342 | if (err != 0) | |
343 | exit(1); | |
344 | } | |
345 | ||
7685d963 | 346 | smp_mb(); |
10c48e14 | 347 | |
78efb485 MD |
348 | test_go = 1; |
349 | ||
350 | sleep(duration); | |
351 | ||
352 | test_stop = 1; | |
353 | ||
10c48e14 MD |
354 | for (i = 0; i < nr_readers; i++) { |
355 | err = pthread_join(tid_reader[i], &tret); | |
356 | if (err != 0) | |
357 | exit(1); | |
358 | tot_reads += count_reader[i]; | |
359 | } | |
360 | for (i = 0; i < nr_writers; i++) { | |
361 | err = pthread_join(tid_writer[i], &tret); | |
362 | if (err != 0) | |
363 | exit(1); | |
364 | tot_writes += count_writer[i]; | |
365 | } | |
4bad7d45 MD |
366 | |
367 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
10c48e14 | 368 | tot_writes); |
6a190115 | 369 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " |
cda3c71d | 370 | "nr_writers %3u " |
9e31d0f0 | 371 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", |
4bad7d45 MD |
372 | argv[0], duration, nr_readers, rduration, |
373 | nr_writers, wdelay, tot_reads, tot_writes, | |
374 | tot_reads + tot_writes); | |
375 | ||
10c48e14 MD |
376 | free(tid_reader); |
377 | free(tid_writer); | |
378 | free(count_reader); | |
379 | free(count_writer); | |
380 | return 0; | |
381 | } |