uatomic compat: complete i386 support
[urcu.git] / tests / 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@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 #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 <sys/syscall.h>
33 #include <pthread.h>
34 #include <errno.h>
35
36 #include <urcu/arch.h>
37
38 #if defined(_syscall0)
39 _syscall0(pid_t, gettid)
40 #elif defined(__NR_gettid)
41 static inline pid_t gettid(void)
42 {
43 return syscall(__NR_gettid);
44 }
45 #else
46 #warning "use pid as tid"
47 static inline pid_t gettid(void)
48 {
49 return getpid();
50 }
51 #endif
52
53 #include <urcu.h>
54
55 struct test_array {
56 int a;
57 };
58
59 pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
60
61 static struct test_array test_array = { 8 };
62
63 #define OUTER_READ_LOOP 200U
64 #define INNER_READ_LOOP 100000U
65 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
66
67 #define OUTER_WRITE_LOOP 10U
68 #define INNER_WRITE_LOOP 200U
69 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
70
71 static int num_read;
72 static int num_write;
73
74 #define NR_READ num_read
75 #define NR_WRITE num_write
76
77 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
78 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
79
80 void *thr_reader(void *arg)
81 {
82 int i, j;
83 cycles_t time1, time2;
84
85 printf("thread_begin %s, thread id : %lx, tid %lu\n",
86 "reader", pthread_self(), (unsigned long)gettid());
87 sleep(2);
88
89 time1 = get_cycles();
90 for (i = 0; i < OUTER_READ_LOOP; i++) {
91 for (j = 0; j < INNER_READ_LOOP; j++) {
92 pthread_rwlock_rdlock(&lock);
93 assert(test_array.a == 8);
94 pthread_rwlock_unlock(&lock);
95 }
96 }
97 time2 = get_cycles();
98
99 reader_time[(unsigned long)arg] = time2 - time1;
100
101 sleep(2);
102 printf("thread_end %s, thread id : %lx, tid %lu\n",
103 "reader", pthread_self(), (unsigned long)gettid());
104 return ((void*)1);
105
106 }
107
108 void *thr_writer(void *arg)
109 {
110 int i, j;
111 cycles_t time1, time2;
112
113 printf("thread_begin %s, thread id : %lx, tid %lu\n",
114 "writer", pthread_self(), (unsigned long)gettid());
115 sleep(2);
116
117 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
118 for (j = 0; j < INNER_WRITE_LOOP; j++) {
119 time1 = get_cycles();
120 pthread_rwlock_wrlock(&lock);
121 test_array.a = 8;
122 pthread_rwlock_unlock(&lock);
123 time2 = get_cycles();
124 writer_time[(unsigned long)arg] += time2 - time1;
125 usleep(1);
126 }
127 }
128
129 printf("thread_end %s, thread id : %lx, tid %lu\n",
130 "writer", pthread_self(), (unsigned long)gettid());
131 return ((void*)2);
132 }
133
134 int main(int argc, char **argv)
135 {
136 int err;
137 pthread_t *tid_reader, *tid_writer;
138 void *tret;
139 int i;
140 cycles_t tot_rtime = 0;
141 cycles_t tot_wtime = 0;
142
143 if (argc < 2) {
144 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
145 exit(-1);
146 }
147 num_read = atoi(argv[1]);
148 num_write = atoi(argv[2]);
149
150 reader_time = malloc(sizeof(*reader_time) * num_read);
151 writer_time = malloc(sizeof(*writer_time) * num_write);
152 tid_reader = malloc(sizeof(*tid_reader) * num_read);
153 tid_writer = malloc(sizeof(*tid_writer) * num_write);
154
155 printf("thread %-6s, thread id : %lx, tid %lu\n",
156 "main", pthread_self(), (unsigned long)gettid());
157
158 for (i = 0; i < NR_READ; i++) {
159 err = pthread_create(&tid_reader[i], NULL, thr_reader,
160 (void *)(long)i);
161 if (err != 0)
162 exit(1);
163 }
164 for (i = 0; i < NR_WRITE; i++) {
165 err = pthread_create(&tid_writer[i], NULL, thr_writer,
166 (void *)(long)i);
167 if (err != 0)
168 exit(1);
169 }
170
171 sleep(10);
172
173 for (i = 0; i < NR_READ; i++) {
174 err = pthread_join(tid_reader[i], &tret);
175 if (err != 0)
176 exit(1);
177 tot_rtime += reader_time[i];
178 }
179 for (i = 0; i < NR_WRITE; i++) {
180 err = pthread_join(tid_writer[i], &tret);
181 if (err != 0)
182 exit(1);
183 tot_wtime += writer_time[i];
184 }
185 printf("Time per read : %g cycles\n",
186 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
187 printf("Time per write : %g cycles\n",
188 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
189
190 free(reader_time);
191 free(writer_time);
192 free(tid_reader);
193 free(tid_writer);
194
195 return 0;
196 }
This page took 0.033739 seconds and 4 git commands to generate.