clock_gettime benchmark

time.c

#include <time.h>
#include <stdio.h>
#include <stdint.h>

#define MILLION 1000000
#define BILLION 1000000000

int main(void)
{
    struct timespec start, end;
    clock_gettime(CLOCK_MONOTONIC_RAW, &start);
    for (int i = 0; i < MILLION; i++)
    {
        clock_gettime(CLOCK_MONOTONIC_RAW, &end);
    }
    int64_t nanoseconds = (end.tv_sec - start.tv_sec) * BILLION;
    nanoseconds += (end.tv_nsec - start.tv_nsec);
    double seconds = (double)nanoseconds / (double)BILLION;
    printf("1 million clock_gettime calls took: %f seconds\n", seconds);
    return 0;
}