c gettimeofday example
#include <time.h>
#include <sys/time.h>
#include <stdlib.h>
#include <stdio.h>
int main(int argc, char **argv)
{
if (argc < 2)
{
printf("USAGE: %s loop-iterations\n", argv[0]);
return 1;
}
int iterations = atoi(argv[1]);
struct timeval start, end;
gettimeofday(&start, NULL);
for (int i = 0; i < iterations; i++)
{
}
gettimeofday(&end, NULL);
printf("%ld\n", ((end.tv_sec * 1000000 + end.tv_usec)
- (start.tv_sec * 1000000 + start.tv_usec)));
return 0;
}