def start(self):
    self._balanced_server.start()
    self._port_registry.add(self.balanced_port, self, None)
    if self._watcher:
      self._watcher.start()
    self._change_watcher_thread.start()
    with self._instances_change_lock:
      if self._max_instances is not None:
        initial_num_instances = min(self._max_instances,
                                    self._initial_num_instances)
      else:
        initial_num_instances = self._initial_num_instances
      for _ in xrange(initial_num_instances):
        self._add_instance()
Start background management of the Server.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/tools/devappserver2/server.py/ManualScalingServer.start