def METHOD_NAME():
    """Drops local filesystem caches."""
    if os_name == 'linux':
        subprocess.call(
            ['sudo', 'sh', '-c', 'echo 3 >/proc/sys/vm/drop_caches'])
    elif os_name == 'mac':
        subprocess.call(['sudo', 'purge'])
    else:
        print('WARNING: FS cache drop unimplemented')