def __init__(self, rate, print_delay_threshold=0.): """Rate in Hz for ratekeeping. print_delay_threshold must be nonnegative.""" self._interval = 1. / rate self._next_frame_time = sec_since_boot() + self._interval self._print_delay_threshold = print_delay_threshold self._frame = 0 self._remaining = 0 self._process_name = multiprocessing.current_process().name
def monitor_time(self): lagged = False remaining = self._next_frame_time - sec_since_boot() self._next_frame_time += self._interval if self._print_delay_threshold is not None and remaining < -self._print_delay_threshold: print("%s lagging by %.2f ms" % (self._process_name, -remaining * 1000)) lagged = True self._frame += 1 self._remaining = remaining return lagged