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51299083 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 | ||
23 | #define _GNU_SOURCE | |
d8540fc5 | 24 | #include "../config.h" |
51299083 MD |
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 <sys/syscall.h> | |
35 | #include <sched.h> | |
94b343fd | 36 | #include <errno.h> |
51299083 | 37 | |
ec4e58a3 | 38 | #include <urcu/arch.h> |
51299083 | 39 | |
2a7ac59d MD |
40 | /* hardcoded number of CPUs */ |
41 | #define NR_CPUS 16384 | |
42 | ||
51299083 MD |
43 | #if defined(_syscall0) |
44 | _syscall0(pid_t, gettid) | |
45 | #elif defined(__NR_gettid) | |
46 | static inline pid_t gettid(void) | |
47 | { | |
48 | return syscall(__NR_gettid); | |
49 | } | |
50 | #else | |
51 | #warning "use pid as tid" | |
52 | static inline pid_t gettid(void) | |
53 | { | |
54 | return getpid(); | |
55 | } | |
56 | #endif | |
57 | ||
58 | #ifndef DYNAMIC_LINK_TEST | |
59 | #define _LGPL_SOURCE | |
60 | #else | |
61 | #define debug_yield_read() | |
62 | #endif | |
ec4e58a3 | 63 | #include <urcu.h> |
51299083 MD |
64 | |
65 | struct test_array { | |
66 | int a; | |
67 | }; | |
68 | ||
69 | static pthread_mutex_t lock; | |
70 | ||
71 | static volatile int test_go, test_stop; | |
72 | ||
9e31d0f0 | 73 | static unsigned long wdelay; |
51299083 MD |
74 | |
75 | static volatile struct test_array test_array = { 8 }; | |
76 | ||
77 | static unsigned long duration; | |
78 | ||
daddf5b0 | 79 | /* read-side C.S. duration, in loops */ |
8b632bab MD |
80 | static unsigned long rduration; |
81 | ||
31b598e0 MD |
82 | /* write-side C.S. duration, in loops */ |
83 | static unsigned long wduration; | |
84 | ||
daddf5b0 MD |
85 | static inline void loop_sleep(unsigned long l) |
86 | { | |
87 | while(l-- != 0) | |
88 | cpu_relax(); | |
89 | } | |
90 | ||
4bad7d45 MD |
91 | static int verbose_mode; |
92 | ||
93 | #define printf_verbose(fmt, args...) \ | |
94 | do { \ | |
95 | if (verbose_mode) \ | |
96 | printf(fmt, args); \ | |
97 | } while (0) | |
98 | ||
2a7ac59d MD |
99 | static unsigned int cpu_affinities[NR_CPUS]; |
100 | static unsigned int next_aff = 0; | |
101 | static int use_affinity = 0; | |
102 | ||
6af882ba MD |
103 | pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER; |
104 | ||
d8540fc5 PA |
105 | #ifndef HAVE_CPU_SET_T |
106 | typedef unsigned long cpu_set_t; | |
107 | # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0) | |
108 | # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0) | |
109 | #endif | |
110 | ||
2a7ac59d MD |
111 | static void set_affinity(void) |
112 | { | |
113 | cpu_set_t mask; | |
114 | int cpu; | |
6af882ba | 115 | int ret; |
2a7ac59d MD |
116 | |
117 | if (!use_affinity) | |
118 | return; | |
119 | ||
d8540fc5 | 120 | #if HAVE_SCHED_SETAFFINITY |
6af882ba MD |
121 | ret = pthread_mutex_lock(&affinity_mutex); |
122 | if (ret) { | |
123 | perror("Error in pthread mutex lock"); | |
124 | exit(-1); | |
125 | } | |
2a7ac59d | 126 | cpu = cpu_affinities[next_aff++]; |
6af882ba MD |
127 | ret = pthread_mutex_unlock(&affinity_mutex); |
128 | if (ret) { | |
129 | perror("Error in pthread mutex unlock"); | |
130 | exit(-1); | |
131 | } | |
2a7ac59d MD |
132 | CPU_ZERO(&mask); |
133 | CPU_SET(cpu, &mask); | |
d8540fc5 PA |
134 | #if SCHED_SETAFFINITY_ARGS == 2 |
135 | sched_setaffinity(0, &mask); | |
136 | #else | |
2a7ac59d | 137 | sched_setaffinity(0, sizeof(mask), &mask); |
d8540fc5 PA |
138 | #endif |
139 | #endif /* HAVE_SCHED_SETAFFINITY */ | |
2a7ac59d MD |
140 | } |
141 | ||
51299083 MD |
142 | /* |
143 | * returns 0 if test should end. | |
144 | */ | |
145 | static int test_duration_write(void) | |
146 | { | |
147 | return !test_stop; | |
148 | } | |
149 | ||
150 | static int test_duration_read(void) | |
151 | { | |
152 | return !test_stop; | |
153 | } | |
154 | ||
155 | static unsigned long long __thread nr_writes; | |
156 | static unsigned long long __thread nr_reads; | |
157 | ||
55271c13 MD |
158 | static |
159 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; | |
160 | static | |
161 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_reads; | |
51299083 MD |
162 | |
163 | static unsigned int nr_readers; | |
164 | static unsigned int nr_writers; | |
165 | ||
166 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
167 | ||
168 | void rcu_copy_mutex_lock(void) | |
169 | { | |
170 | int ret; | |
171 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
172 | if (ret) { | |
173 | perror("Error in pthread mutex lock"); | |
174 | exit(-1); | |
175 | } | |
176 | } | |
177 | ||
178 | void rcu_copy_mutex_unlock(void) | |
179 | { | |
180 | int ret; | |
181 | ||
182 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
183 | if (ret) { | |
184 | perror("Error in pthread mutex unlock"); | |
185 | exit(-1); | |
186 | } | |
187 | } | |
188 | ||
189 | void *thr_reader(void *data) | |
190 | { | |
191 | unsigned long tidx = (unsigned long)data; | |
192 | ||
4bad7d45 | 193 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
51299083 MD |
194 | "reader", pthread_self(), (unsigned long)gettid()); |
195 | ||
2a7ac59d MD |
196 | set_affinity(); |
197 | ||
51299083 MD |
198 | while (!test_go) |
199 | { | |
200 | } | |
201 | ||
202 | for (;;) { | |
203 | pthread_mutex_lock(&lock); | |
204 | assert(test_array.a == 8); | |
8b632bab | 205 | if (unlikely(rduration)) |
daddf5b0 | 206 | loop_sleep(rduration); |
51299083 MD |
207 | pthread_mutex_unlock(&lock); |
208 | nr_reads++; | |
209 | if (unlikely(!test_duration_read())) | |
210 | break; | |
211 | } | |
212 | ||
213 | tot_nr_reads[tidx] = nr_reads; | |
cda3c71d | 214 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
51299083 MD |
215 | "reader", pthread_self(), (unsigned long)gettid()); |
216 | return ((void*)1); | |
217 | ||
218 | } | |
219 | ||
220 | void *thr_writer(void *data) | |
221 | { | |
222 | unsigned long wtidx = (unsigned long)data; | |
223 | ||
4bad7d45 | 224 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
51299083 MD |
225 | "writer", pthread_self(), (unsigned long)gettid()); |
226 | ||
2a7ac59d MD |
227 | set_affinity(); |
228 | ||
51299083 MD |
229 | while (!test_go) |
230 | { | |
231 | } | |
232 | smp_mb(); | |
233 | ||
234 | for (;;) { | |
235 | pthread_mutex_lock(&lock); | |
236 | test_array.a = 0; | |
237 | test_array.a = 8; | |
31b598e0 MD |
238 | if (unlikely(wduration)) |
239 | loop_sleep(wduration); | |
51299083 MD |
240 | pthread_mutex_unlock(&lock); |
241 | nr_writes++; | |
242 | if (unlikely(!test_duration_write())) | |
243 | break; | |
244 | if (unlikely(wdelay)) | |
9e31d0f0 | 245 | loop_sleep(wdelay); |
51299083 MD |
246 | } |
247 | ||
4bad7d45 | 248 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
51299083 MD |
249 | "writer", pthread_self(), (unsigned long)gettid()); |
250 | tot_nr_writes[wtidx] = nr_writes; | |
251 | return ((void*)2); | |
252 | } | |
253 | ||
254 | void show_usage(int argc, char **argv) | |
255 | { | |
256 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
257 | #ifdef DEBUG_YIELD | |
258 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
259 | #endif | |
260 | printf(" [-d delay] (writer period (us))"); | |
daddf5b0 | 261 | printf(" [-c duration] (reader C.S. duration (in loops))"); |
31b598e0 | 262 | printf(" [-e duration] (writer C.S. duration (in loops))"); |
4bad7d45 | 263 | printf(" [-v] (verbose output)"); |
51299083 MD |
264 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); |
265 | printf("\n"); | |
266 | } | |
267 | ||
51299083 MD |
268 | int main(int argc, char **argv) |
269 | { | |
270 | int err; | |
271 | pthread_t *tid_reader, *tid_writer; | |
272 | void *tret; | |
273 | unsigned long long *count_reader, *count_writer; | |
274 | unsigned long long tot_reads = 0, tot_writes = 0; | |
275 | int i, a; | |
51299083 MD |
276 | |
277 | if (argc < 4) { | |
278 | show_usage(argc, argv); | |
279 | return -1; | |
280 | } | |
281 | smp_mb(); | |
282 | ||
283 | err = sscanf(argv[1], "%u", &nr_readers); | |
284 | if (err != 1) { | |
285 | show_usage(argc, argv); | |
286 | return -1; | |
287 | } | |
288 | ||
289 | err = sscanf(argv[2], "%u", &nr_writers); | |
290 | if (err != 1) { | |
291 | show_usage(argc, argv); | |
292 | return -1; | |
293 | } | |
294 | ||
295 | err = sscanf(argv[3], "%lu", &duration); | |
296 | if (err != 1) { | |
297 | show_usage(argc, argv); | |
298 | return -1; | |
299 | } | |
300 | ||
51299083 MD |
301 | for (i = 4; i < argc; i++) { |
302 | if (argv[i][0] != '-') | |
303 | continue; | |
304 | switch (argv[i][1]) { | |
305 | #ifdef DEBUG_YIELD | |
306 | case 'r': | |
307 | yield_active |= YIELD_READ; | |
308 | break; | |
309 | case 'w': | |
310 | yield_active |= YIELD_WRITE; | |
311 | break; | |
312 | #endif | |
313 | case 'a': | |
314 | if (argc < i + 2) { | |
315 | show_usage(argc, argv); | |
316 | return -1; | |
317 | } | |
318 | a = atoi(argv[++i]); | |
2a7ac59d | 319 | cpu_affinities[next_aff++] = a; |
51299083 | 320 | use_affinity = 1; |
4bad7d45 | 321 | printf_verbose("Adding CPU %d affinity\n", a); |
51299083 | 322 | break; |
8b632bab MD |
323 | case 'c': |
324 | if (argc < i + 2) { | |
325 | show_usage(argc, argv); | |
326 | return -1; | |
327 | } | |
9e31d0f0 | 328 | rduration = atol(argv[++i]); |
8b632bab | 329 | break; |
51299083 MD |
330 | case 'd': |
331 | if (argc < i + 2) { | |
332 | show_usage(argc, argv); | |
333 | return -1; | |
334 | } | |
9e31d0f0 | 335 | wdelay = atol(argv[++i]); |
51299083 | 336 | break; |
31b598e0 MD |
337 | case 'e': |
338 | if (argc < i + 2) { | |
339 | show_usage(argc, argv); | |
340 | return -1; | |
341 | } | |
342 | wduration = atol(argv[++i]); | |
343 | break; | |
4bad7d45 MD |
344 | case 'v': |
345 | verbose_mode = 1; | |
346 | break; | |
51299083 MD |
347 | } |
348 | } | |
349 | ||
4bad7d45 | 350 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", |
51299083 | 351 | duration, nr_readers, nr_writers); |
9e31d0f0 | 352 | printf_verbose("Writer delay : %lu loops.\n", wdelay); |
4bad7d45 MD |
353 | printf_verbose("Reader duration : %lu loops.\n", rduration); |
354 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
51299083 MD |
355 | "main", pthread_self(), (unsigned long)gettid()); |
356 | ||
51299083 MD |
357 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); |
358 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
359 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
360 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
361 | tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers); | |
362 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); | |
363 | ||
2a7ac59d MD |
364 | next_aff = 0; |
365 | ||
51299083 MD |
366 | for (i = 0; i < nr_readers; i++) { |
367 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
368 | (void *)(long)i); | |
369 | if (err != 0) | |
370 | exit(1); | |
371 | } | |
372 | for (i = 0; i < nr_writers; i++) { | |
373 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
374 | (void *)(long)i); | |
375 | if (err != 0) | |
376 | exit(1); | |
377 | } | |
378 | ||
379 | smp_mb(); | |
380 | ||
381 | test_go = 1; | |
382 | ||
383 | sleep(duration); | |
384 | ||
385 | test_stop = 1; | |
386 | ||
387 | for (i = 0; i < nr_readers; i++) { | |
388 | err = pthread_join(tid_reader[i], &tret); | |
389 | if (err != 0) | |
390 | exit(1); | |
391 | tot_reads += tot_nr_reads[i]; | |
392 | } | |
393 | for (i = 0; i < nr_writers; i++) { | |
394 | err = pthread_join(tid_writer[i], &tret); | |
395 | if (err != 0) | |
396 | exit(1); | |
397 | tot_writes += tot_nr_writes[i]; | |
398 | } | |
4bad7d45 MD |
399 | |
400 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
51299083 | 401 | tot_writes); |
a50a7b43 | 402 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu " |
cda3c71d | 403 | "nr_writers %3u " |
9e31d0f0 | 404 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", |
a50a7b43 | 405 | argv[0], duration, nr_readers, rduration, wduration, |
4bad7d45 MD |
406 | nr_writers, wdelay, tot_reads, tot_writes, |
407 | tot_reads + tot_writes); | |
408 | ||
51299083 MD |
409 | free(tid_reader); |
410 | free(tid_writer); | |
411 | free(count_reader); | |
412 | free(count_writer); | |
413 | free(tot_nr_reads); | |
414 | free(tot_nr_writes); | |
415 | return 0; | |
416 | } |