re-do termination synchronization

Author: bknueven

mpisppy/cylinders/spoke.py

@@ -26,8 +26,8 @@ def got_kill_signal(self):
             to see if the Hub terminated
         """
         shutdown_buf = self.receive_buffers[self._make_key(Field.SHUTDOWN, 0)]
-        self.get_receive_buffer(shutdown_buf, Field.SHUTDOWN, 0)
-        return shutdown_buf[0] == 1.0
+        self.get_receive_buffer(shutdown_buf, Field.SHUTDOWN, 0, synchronize=False)
+        return self.allreduce_or(shutdown_buf[0] == 1.0)
 
     @abc.abstractmethod
     def main(self):