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