45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/*
|
|
* Copyright (c) 2011 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* benchsyscall.c
|
|
* Benchmarks the speed of system calls.
|
|
*/
|
|
|
|
#include <err.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <time.h>
|
|
|
|
static int uptime(uintmax_t* usecs)
|
|
{
|
|
struct timespec uptime;
|
|
if ( clock_gettime(CLOCK_BOOTTIME, &uptime) < 0 )
|
|
return -1;
|
|
*usecs = uptime.tv_sec * 1000000ULL + uptime.tv_nsec / 1000ULL;
|
|
return 0;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
uintmax_t start;
|
|
if ( uptime(&start) )
|
|
err(1, "uptime");
|
|
uintmax_t end = start + 1ULL * 1000ULL * 1000ULL; // 1 second
|
|
size_t count = 0;
|
|
uintmax_t now;
|
|
while ( !uptime(&now) && now < end ) { count++; }
|
|
printf("Made %zu system calls in 1 second\n", count);
|
|
return 0;
|
|
}
|