Doing some benchmarks on a lib, found out that gettimeofday is way faster on MacOS (10.6) than Linux (3.8.0)(50ms vs 600+ms on the same machine, 64bit in both cases)

gettime.c

#include <stdio.h>
#include <time.h>
#include <sys/time.h>

#define COUNT 800000

int main() {
    long i = 0;
    long start, end;
    struct timeval tstart, tend, tt;

    gettimeofday(&tstart, NULL);
    for (; i < 800000; i++) {
        gettimeofday(&tt, NULL);
    }
    gettimeofday(&tend, NULL);

    start = (long)tstart.tv_sec * 1000 + (long)tstart.tv_usec / 1000;
    end = (long)tend.tv_sec * 1000 + (long)tend.tv_usec / 1000;

    printf("Done in %ldms (%ld op/s)\n", end - start, COUNT / (end-start) * 1000);

    return 0;
}