uint64_t GetTime(void) {
    #if defined(_WIN32) || defined(_WIN64)
    static struct _timeb tv;
    _ftime(&tv);
    return(tv.time * 1000 + tv.millitm);
    #else
    static struct timeval tv;
    static struct timezone tz;
    gettimeofday (&tv, &tz);
    return(tv.tv_sec * 1000 + (tv.tv_usec / 1000));
    #endif
}