Commit | Line | Data |
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fd6a23f2 MD |
1 | /* |
2 | * test_looplen.c | |
3 | * | |
4 | * Userspace RCU library - test program | |
5 | * | |
6982d6d7 | 6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fd6a23f2 MD |
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> | |
fd6a23f2 | 33 | #include <sched.h> |
94b343fd | 34 | #include <errno.h> |
fd6a23f2 | 35 | |
ec4e58a3 | 36 | #include <urcu/arch.h> |
fd6a23f2 | 37 | |
65fcc7e9 MD |
38 | #ifdef __linux__ |
39 | #include <syscall.h> | |
40 | #endif | |
41 | ||
fd6a23f2 MD |
42 | #if defined(_syscall0) |
43 | _syscall0(pid_t, gettid) | |
44 | #elif defined(__NR_gettid) | |
45 | static inline pid_t gettid(void) | |
46 | { | |
47 | return syscall(__NR_gettid); | |
48 | } | |
49 | #else | |
50 | #warning "use pid as tid" | |
51 | static inline pid_t gettid(void) | |
52 | { | |
53 | return getpid(); | |
54 | } | |
55 | #endif | |
56 | ||
57 | #ifndef DYNAMIC_LINK_TEST | |
58 | #define _LGPL_SOURCE | |
59 | #else | |
60 | #define debug_yield_read() | |
61 | #endif | |
ec4e58a3 | 62 | #include <urcu.h> |
fd6a23f2 | 63 | |
ab0aacbe | 64 | static inline void loop_sleep(unsigned long loops) |
fd6a23f2 | 65 | { |
ab0aacbe | 66 | while (loops-- != 0) |
06f22bdb | 67 | caa_cpu_relax(); |
fd6a23f2 MD |
68 | } |
69 | ||
70 | #define LOOPS 1048576 | |
71 | #define TESTS 10 | |
72 | ||
73 | int main(int argc, char **argv) | |
74 | { | |
75 | unsigned long i; | |
76 | cycles_t time1, time2; | |
77 | cycles_t time_tot = 0; | |
85d2a666 | 78 | double cpl; |
fd6a23f2 MD |
79 | |
80 | for (i = 0; i < TESTS; i++) { | |
06f22bdb | 81 | time1 = caa_get_cycles(); |
fd6a23f2 | 82 | loop_sleep(LOOPS); |
06f22bdb | 83 | time2 = caa_get_cycles(); |
fd6a23f2 MD |
84 | time_tot += time2 - time1; |
85 | } | |
85d2a666 | 86 | cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS; |
fd6a23f2 | 87 | |
85d2a666 PM |
88 | printf("CALIBRATION : %g cycles per loop\n", cpl); |
89 | printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n", | |
90 | time_tot, LOOPS, TESTS); | |
fd6a23f2 MD |
91 | |
92 | return 0; | |
93 | } |