c8b5a0256abebc7f14b546040ba2d7259eda6a4f
[urcu.git] / tests / benchmark / test_looplen.c
1 /*
2 * test_looplen.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 #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 <sched.h>
34 #include <errno.h>
35
36 #include <urcu/arch.h>
37
38 #ifndef DYNAMIC_LINK_TEST
39 #define _LGPL_SOURCE
40 #else
41 #define debug_yield_read()
42 #endif
43 #include <urcu.h>
44
45 static inline void loop_sleep(unsigned long loops)
46 {
47 while (loops-- != 0)
48 caa_cpu_relax();
49 }
50
51 #define LOOPS 1048576
52 #define TESTS 10
53
54 int main(int argc, char **argv)
55 {
56 unsigned long i;
57 caa_cycles_t time1, time2;
58 caa_cycles_t time_tot = 0;
59 double cpl;
60
61 for (i = 0; i < TESTS; i++) {
62 time1 = caa_get_cycles();
63 loop_sleep(LOOPS);
64 time2 = caa_get_cycles();
65 time_tot += time2 - time1;
66 }
67 cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;
68
69 printf("CALIBRATION : %g cycles per loop\n", cpl);
70 printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
71 time_tot, LOOPS, TESTS);
72
73 return 0;
74 }
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