def METHOD_NAME(self):
    self.crawler.stats.set_value("memusage/startup", self.get_virtual_size())
    self.tasks = []
    tsk = task.LoopingCall(self.update)
    self.tasks.append(tsk)
    tsk.start(self.check_interval, now=True)
    if self.limit:
        tsk = task.LoopingCall(self._check_limit)
        self.tasks.append(tsk)
        tsk.start(self.check_interval, now=True)
    if self.warning:
        tsk = task.LoopingCall(self._check_warning)
        self.tasks.append(tsk)
        tsk.start(self.check_interval, now=True)