diff options
Diffstat (limited to 'open_issues/performance/io_system/test-mach.c')
| -rw-r--r-- | open_issues/performance/io_system/test-mach.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/open_issues/performance/io_system/test-mach.c b/open_issues/performance/io_system/test-mach.c index 44f62a4e..90337346 100644 --- a/open_issues/performance/io_system/test-mach.c +++ b/open_issues/performance/io_system/test-mach.c @@ -2,6 +2,7 @@ #include <stdio.h> #include <fcntl.h> #include <mach/mach.h> +#define N 1000000 int main(void) { struct timeval tv1, tv2; int i; @@ -9,10 +10,10 @@ int main(void) { task = mach_task_self(); mach_port_urefs_t refs; gettimeofday(&tv1, NULL); - for (i = 0; i < 1000000; i++) { + for (i = 0; i < N; i++) { mach_port_get_refs(task, task, MACH_PORT_RIGHT_RECEIVE, &refs); } gettimeofday(&tv2, NULL); - printf("%07lu\n", (tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec); + printf("%fµs\n", (float)((tv2.tv_sec-tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec)/N); return 0; } |