| 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 | #ifdef __linux__ |
| 39 | #include <syscall.h> |
| 40 | #endif |
| 41 | |
| 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 |
| 62 | #include <urcu.h> |
| 63 | |
| 64 | static inline void loop_sleep(unsigned long l) |
| 65 | { |
| 66 | while(l-- != 0) |
| 67 | caa_cpu_relax(); |
| 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; |
| 78 | double cpl; |
| 79 | |
| 80 | for (i = 0; i < TESTS; i++) { |
| 81 | time1 = caa_get_cycles(); |
| 82 | loop_sleep(LOOPS); |
| 83 | time2 = caa_get_cycles(); |
| 84 | time_tot += time2 - time1; |
| 85 | } |
| 86 | cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS; |
| 87 | |
| 88 | printf("CALIBRATION : %g cycles per loop\n", cpl); |
| 89 | printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n", |
| 90 | time_tot, LOOPS, TESTS); |
| 91 | |
| 92 | return 0; |
| 93 | } |