'Return the total transferred, and over what period.
Args:
throttle_name: The name of the throttle to total.
Returns:
A tuple of the total count and running time for the given throttle name.'

def TotalTransferred(self, throttle_name):

    total = 0
    for count in self.totals[throttle_name].values():
        total += count
    for count in self.transferred[throttle_name].values():
        total += count
    return (total, (self.get_time() - self.start_time))
