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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 | ||
fd6a23f2 MD |
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> | |
fd6a23f2 | 31 | #include <sched.h> |
94b343fd | 32 | #include <errno.h> |
fd6a23f2 | 33 | |
ec4e58a3 | 34 | #include <urcu/arch.h> |
01477510 | 35 | #include <urcu/assert.h> |
fd6a23f2 | 36 | |
fd6a23f2 MD |
37 | #ifndef DYNAMIC_LINK_TEST |
38 | #define _LGPL_SOURCE | |
39 | #else | |
40 | #define debug_yield_read() | |
41 | #endif | |
ec4e58a3 | 42 | #include <urcu.h> |
fd6a23f2 | 43 | |
ab0aacbe | 44 | static inline void loop_sleep(unsigned long loops) |
fd6a23f2 | 45 | { |
ab0aacbe | 46 | while (loops-- != 0) |
06f22bdb | 47 | caa_cpu_relax(); |
fd6a23f2 MD |
48 | } |
49 | ||
50 | #define LOOPS 1048576 | |
51 | #define TESTS 10 | |
52 | ||
70469b43 | 53 | int main(void) |
fd6a23f2 MD |
54 | { |
55 | unsigned long i; | |
3fa18286 MD |
56 | caa_cycles_t time1, time2; |
57 | caa_cycles_t time_tot = 0; | |
85d2a666 | 58 | double cpl; |
fd6a23f2 MD |
59 | |
60 | for (i = 0; i < TESTS; i++) { | |
06f22bdb | 61 | time1 = caa_get_cycles(); |
fd6a23f2 | 62 | loop_sleep(LOOPS); |
06f22bdb | 63 | time2 = caa_get_cycles(); |
fd6a23f2 MD |
64 | time_tot += time2 - time1; |
65 | } | |
85d2a666 | 66 | cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS; |
fd6a23f2 | 67 | |
85d2a666 PM |
68 | printf("CALIBRATION : %g cycles per loop\n", cpl); |
69 | printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n", | |
9ee07024 | 70 | (unsigned long long) time_tot, LOOPS, TESTS); |
fd6a23f2 MD |
71 | |
72 | return 0; | |
73 | } |