Cleanup: enable signed/unsigned compare compiler warning
[urcu.git] / tests / benchmark / test_rwlock_timing.c
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 #include <stdio.h>
24 #include <pthread.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/types.h>
28 #include <sys/wait.h>
29 #include <unistd.h>
30 #include <stdio.h>
31 #include <assert.h>
32 #include <pthread.h>
33 #include <errno.h>
34
35 #include <urcu/arch.h>
36
37 #include "thread-id.h"
38
39 #include <urcu.h>
40
41 struct test_array {
42 int a;
43 };
44
45 /*
46 * static rwlock initializer is broken on Cygwin. Use runtime
47 * initialization.
48 */
49 pthread_rwlock_t lock;
50
51 static struct test_array test_array = { 8 };
52
53 #define OUTER_READ_LOOP 200U
54 #define INNER_READ_LOOP 100000U
55 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
56
57 #define OUTER_WRITE_LOOP 10U
58 #define INNER_WRITE_LOOP 200U
59 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
60
61 static int num_read;
62 static int num_write;
63
64 #define NR_READ num_read
65 #define NR_WRITE num_write
66
67 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
68 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
69
70 void *thr_reader(void *arg)
71 {
72 unsigned int i, j;
73 int ret;
74 caa_cycles_t time1, time2;
75
76 printf("thread_begin %s, tid %lu\n",
77 "reader", urcu_get_thread_id());
78 sleep(2);
79
80 time1 = caa_get_cycles();
81 for (i = 0; i < OUTER_READ_LOOP; i++) {
82 for (j = 0; j < INNER_READ_LOOP; j++) {
83 ret = pthread_rwlock_rdlock(&lock);
84 if (ret) {
85 fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
86 abort();
87 }
88
89 assert(test_array.a == 8);
90
91 ret = pthread_rwlock_unlock(&lock);
92 if (ret) {
93 fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
94 abort();
95 }
96 }
97 }
98 time2 = caa_get_cycles();
99
100 reader_time[(unsigned long)arg] = time2 - time1;
101
102 sleep(2);
103 printf("thread_end %s, tid %lu\n",
104 "reader", urcu_get_thread_id());
105 return ((void*)1);
106
107 }
108
109 void *thr_writer(void *arg)
110 {
111 unsigned int i, j;
112 int ret;
113 caa_cycles_t time1, time2;
114
115 printf("thread_begin %s, tid %lu\n",
116 "writer", urcu_get_thread_id());
117 sleep(2);
118
119 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
120 for (j = 0; j < INNER_WRITE_LOOP; j++) {
121 time1 = caa_get_cycles();
122 ret = pthread_rwlock_wrlock(&lock);
123 if (ret) {
124 fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
125 abort();
126 }
127
128 test_array.a = 8;
129
130 ret = pthread_rwlock_unlock(&lock);
131 if (ret) {
132 fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
133 abort();
134 }
135
136 time2 = caa_get_cycles();
137 writer_time[(unsigned long)arg] += time2 - time1;
138 usleep(1);
139 }
140 }
141
142 printf("thread_end %s, tid %lu\n",
143 "writer", urcu_get_thread_id());
144 return ((void*)2);
145 }
146
147 int main(int argc, char **argv)
148 {
149 int err;
150 pthread_t *tid_reader, *tid_writer;
151 void *tret;
152 int i;
153 caa_cycles_t tot_rtime = 0;
154 caa_cycles_t tot_wtime = 0;
155
156 if (argc < 2) {
157 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
158 exit(-1);
159 }
160 num_read = atoi(argv[1]);
161 num_write = atoi(argv[2]);
162
163 err = pthread_rwlock_init(&lock, NULL);
164 if (err != 0) {
165 fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
166 exit(1);
167 }
168
169 reader_time = calloc(num_read, sizeof(*reader_time));
170 writer_time = calloc(num_write, sizeof(*writer_time));
171 tid_reader = calloc(num_read, sizeof(*tid_reader));
172 tid_writer = calloc(num_write, sizeof(*tid_writer));
173
174 printf("thread %-6s, tid %lu\n",
175 "main", urcu_get_thread_id());
176
177 for (i = 0; i < NR_READ; i++) {
178 err = pthread_create(&tid_reader[i], NULL, thr_reader,
179 (void *)(long)i);
180 if (err != 0)
181 exit(1);
182 }
183 for (i = 0; i < NR_WRITE; i++) {
184 err = pthread_create(&tid_writer[i], NULL, thr_writer,
185 (void *)(long)i);
186 if (err != 0)
187 exit(1);
188 }
189
190 sleep(10);
191
192 for (i = 0; i < NR_READ; i++) {
193 err = pthread_join(tid_reader[i], &tret);
194 if (err != 0)
195 exit(1);
196 tot_rtime += reader_time[i];
197 }
198 for (i = 0; i < NR_WRITE; i++) {
199 err = pthread_join(tid_writer[i], &tret);
200 if (err != 0)
201 exit(1);
202 tot_wtime += writer_time[i];
203 }
204 printf("Time per read : %g cycles\n",
205 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
206 printf("Time per write : %g cycles\n",
207 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
208
209 err = pthread_rwlock_destroy(&lock);
210 if (err != 0) {
211 fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
212 exit(1);
213 }
214 free(reader_time);
215 free(writer_time);
216 free(tid_reader);
217 free(tid_writer);
218
219 return 0;
220 }
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