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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 | |
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> | |
34 | #include <sched.h> | |
35 | ||
36 | #include "arch.h" | |
37 | ||
55271c13 MD |
38 | /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */ |
39 | #define CACHE_LINE_SIZE 4096 | |
40 | ||
51299083 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 | |
61 | #include "urcu.h" | |
62 | ||
63 | struct test_array { | |
64 | int a; | |
65 | }; | |
66 | ||
67 | static pthread_mutex_t lock; | |
68 | ||
69 | static volatile int test_go, test_stop; | |
70 | ||
9e31d0f0 | 71 | static unsigned long wdelay; |
51299083 MD |
72 | |
73 | static volatile struct test_array test_array = { 8 }; | |
74 | ||
75 | static unsigned long duration; | |
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 | ||
51299083 MD |
94 | /* |
95 | * returns 0 if test should end. | |
96 | */ | |
97 | static int test_duration_write(void) | |
98 | { | |
99 | return !test_stop; | |
100 | } | |
101 | ||
102 | static int test_duration_read(void) | |
103 | { | |
104 | return !test_stop; | |
105 | } | |
106 | ||
107 | static unsigned long long __thread nr_writes; | |
108 | static unsigned long long __thread nr_reads; | |
109 | ||
55271c13 MD |
110 | static |
111 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_writes; | |
112 | static | |
113 | unsigned long long __attribute__((aligned(CACHE_LINE_SIZE))) *tot_nr_reads; | |
51299083 MD |
114 | |
115 | static unsigned int nr_readers; | |
116 | static unsigned int nr_writers; | |
117 | ||
118 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
119 | ||
120 | void rcu_copy_mutex_lock(void) | |
121 | { | |
122 | int ret; | |
123 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
124 | if (ret) { | |
125 | perror("Error in pthread mutex lock"); | |
126 | exit(-1); | |
127 | } | |
128 | } | |
129 | ||
130 | void rcu_copy_mutex_unlock(void) | |
131 | { | |
132 | int ret; | |
133 | ||
134 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
135 | if (ret) { | |
136 | perror("Error in pthread mutex unlock"); | |
137 | exit(-1); | |
138 | } | |
139 | } | |
140 | ||
141 | void *thr_reader(void *data) | |
142 | { | |
143 | unsigned long tidx = (unsigned long)data; | |
144 | ||
4bad7d45 | 145 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
51299083 MD |
146 | "reader", pthread_self(), (unsigned long)gettid()); |
147 | ||
148 | while (!test_go) | |
149 | { | |
150 | } | |
151 | ||
152 | for (;;) { | |
153 | pthread_mutex_lock(&lock); | |
154 | assert(test_array.a == 8); | |
8b632bab | 155 | if (unlikely(rduration)) |
daddf5b0 | 156 | loop_sleep(rduration); |
51299083 MD |
157 | pthread_mutex_unlock(&lock); |
158 | nr_reads++; | |
159 | if (unlikely(!test_duration_read())) | |
160 | break; | |
161 | } | |
162 | ||
163 | tot_nr_reads[tidx] = nr_reads; | |
cda3c71d | 164 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
51299083 MD |
165 | "reader", pthread_self(), (unsigned long)gettid()); |
166 | return ((void*)1); | |
167 | ||
168 | } | |
169 | ||
170 | void *thr_writer(void *data) | |
171 | { | |
172 | unsigned long wtidx = (unsigned long)data; | |
173 | ||
4bad7d45 | 174 | printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n", |
51299083 MD |
175 | "writer", pthread_self(), (unsigned long)gettid()); |
176 | ||
177 | while (!test_go) | |
178 | { | |
179 | } | |
180 | smp_mb(); | |
181 | ||
182 | for (;;) { | |
183 | pthread_mutex_lock(&lock); | |
184 | test_array.a = 0; | |
185 | test_array.a = 8; | |
186 | pthread_mutex_unlock(&lock); | |
187 | nr_writes++; | |
188 | if (unlikely(!test_duration_write())) | |
189 | break; | |
190 | if (unlikely(wdelay)) | |
9e31d0f0 | 191 | loop_sleep(wdelay); |
51299083 MD |
192 | } |
193 | ||
4bad7d45 | 194 | printf_verbose("thread_end %s, thread id : %lx, tid %lu\n", |
51299083 MD |
195 | "writer", pthread_self(), (unsigned long)gettid()); |
196 | tot_nr_writes[wtidx] = nr_writes; | |
197 | return ((void*)2); | |
198 | } | |
199 | ||
200 | void show_usage(int argc, char **argv) | |
201 | { | |
202 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); | |
203 | #ifdef DEBUG_YIELD | |
204 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
205 | #endif | |
206 | printf(" [-d delay] (writer period (us))"); | |
daddf5b0 | 207 | printf(" [-c duration] (reader C.S. duration (in loops))"); |
4bad7d45 | 208 | printf(" [-v] (verbose output)"); |
51299083 MD |
209 | printf(" [-a cpu#] [-a cpu#]... (affinity)"); |
210 | printf("\n"); | |
211 | } | |
212 | ||
213 | cpu_set_t affinity; | |
214 | ||
215 | int main(int argc, char **argv) | |
216 | { | |
217 | int err; | |
218 | pthread_t *tid_reader, *tid_writer; | |
219 | void *tret; | |
220 | unsigned long long *count_reader, *count_writer; | |
221 | unsigned long long tot_reads = 0, tot_writes = 0; | |
222 | int i, a; | |
223 | int use_affinity = 0; | |
224 | ||
225 | if (argc < 4) { | |
226 | show_usage(argc, argv); | |
227 | return -1; | |
228 | } | |
229 | smp_mb(); | |
230 | ||
231 | err = sscanf(argv[1], "%u", &nr_readers); | |
232 | if (err != 1) { | |
233 | show_usage(argc, argv); | |
234 | return -1; | |
235 | } | |
236 | ||
237 | err = sscanf(argv[2], "%u", &nr_writers); | |
238 | if (err != 1) { | |
239 | show_usage(argc, argv); | |
240 | return -1; | |
241 | } | |
242 | ||
243 | err = sscanf(argv[3], "%lu", &duration); | |
244 | if (err != 1) { | |
245 | show_usage(argc, argv); | |
246 | return -1; | |
247 | } | |
248 | ||
249 | CPU_ZERO(&affinity); | |
250 | ||
251 | for (i = 4; i < argc; i++) { | |
252 | if (argv[i][0] != '-') | |
253 | continue; | |
254 | switch (argv[i][1]) { | |
255 | #ifdef DEBUG_YIELD | |
256 | case 'r': | |
257 | yield_active |= YIELD_READ; | |
258 | break; | |
259 | case 'w': | |
260 | yield_active |= YIELD_WRITE; | |
261 | break; | |
262 | #endif | |
263 | case 'a': | |
264 | if (argc < i + 2) { | |
265 | show_usage(argc, argv); | |
266 | return -1; | |
267 | } | |
268 | a = atoi(argv[++i]); | |
269 | CPU_SET(a, &affinity); | |
270 | use_affinity = 1; | |
4bad7d45 | 271 | printf_verbose("Adding CPU %d affinity\n", a); |
51299083 | 272 | break; |
8b632bab MD |
273 | case 'c': |
274 | if (argc < i + 2) { | |
275 | show_usage(argc, argv); | |
276 | return -1; | |
277 | } | |
9e31d0f0 | 278 | rduration = atol(argv[++i]); |
8b632bab | 279 | break; |
51299083 MD |
280 | case 'd': |
281 | if (argc < i + 2) { | |
282 | show_usage(argc, argv); | |
283 | return -1; | |
284 | } | |
9e31d0f0 | 285 | wdelay = atol(argv[++i]); |
51299083 | 286 | break; |
4bad7d45 MD |
287 | case 'v': |
288 | verbose_mode = 1; | |
289 | break; | |
51299083 MD |
290 | } |
291 | } | |
292 | ||
4bad7d45 | 293 | printf_verbose("running test for %lu seconds, %u readers, %u writers.\n", |
51299083 | 294 | duration, nr_readers, nr_writers); |
9e31d0f0 | 295 | printf_verbose("Writer delay : %lu loops.\n", wdelay); |
4bad7d45 MD |
296 | printf_verbose("Reader duration : %lu loops.\n", rduration); |
297 | printf_verbose("thread %-6s, thread id : %lx, tid %lu\n", | |
51299083 MD |
298 | "main", pthread_self(), (unsigned long)gettid()); |
299 | ||
300 | if (use_affinity | |
301 | && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) { | |
302 | perror("sched_setaffinity"); | |
303 | exit(-1); | |
304 | } | |
305 | ||
306 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); | |
307 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); | |
308 | count_reader = malloc(sizeof(*count_reader) * nr_readers); | |
309 | count_writer = malloc(sizeof(*count_writer) * nr_writers); | |
310 | tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers); | |
311 | tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers); | |
312 | ||
313 | for (i = 0; i < nr_readers; i++) { | |
314 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
315 | (void *)(long)i); | |
316 | if (err != 0) | |
317 | exit(1); | |
318 | } | |
319 | for (i = 0; i < nr_writers; i++) { | |
320 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
321 | (void *)(long)i); | |
322 | if (err != 0) | |
323 | exit(1); | |
324 | } | |
325 | ||
326 | smp_mb(); | |
327 | ||
328 | test_go = 1; | |
329 | ||
330 | sleep(duration); | |
331 | ||
332 | test_stop = 1; | |
333 | ||
334 | for (i = 0; i < nr_readers; i++) { | |
335 | err = pthread_join(tid_reader[i], &tret); | |
336 | if (err != 0) | |
337 | exit(1); | |
338 | tot_reads += tot_nr_reads[i]; | |
339 | } | |
340 | for (i = 0; i < nr_writers; i++) { | |
341 | err = pthread_join(tid_writer[i], &tret); | |
342 | if (err != 0) | |
343 | exit(1); | |
344 | tot_writes += tot_nr_writes[i]; | |
345 | } | |
4bad7d45 MD |
346 | |
347 | printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads, | |
51299083 | 348 | tot_writes); |
6a190115 | 349 | printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu " |
cda3c71d | 350 | "nr_writers %3u " |
9e31d0f0 | 351 | "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n", |
4bad7d45 MD |
352 | argv[0], duration, nr_readers, rduration, |
353 | nr_writers, wdelay, tot_reads, tot_writes, | |
354 | tot_reads + tot_writes); | |
355 | ||
51299083 MD |
356 | free(tid_reader); |
357 | free(tid_writer); | |
358 | free(count_reader); | |
359 | free(count_writer); | |
360 | free(tot_nr_reads); | |
361 | free(tot_nr_writes); | |
362 | return 0; | |
363 | } |