压测跑完后agent不退出

[efuton]

ngrinder已经跑完，出测试结果，agent退出不成功，log如下
2015-01-22 18:12:09,680 INFO  agent daemon: communication shut down
2015-01-22 18:12:10,316 ERROR agent daemon: Error while pumping up the AgentProcessReportMessage
2015-01-22 18:12:14,681 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:19,783 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:24,883 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:29,984 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:35,085 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:40,186 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:45,287 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:50,388 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:12:55,489 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:13:00,590 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:13:05,691 INFO  agent daemon: Terminating unresponsive processes by force
2015-01-22 18:13:10,792 INFO  agent daemon: Terminating unresponsive processes by force