netstat -lan|grep 11211 查看memcached 是否启动
sudo killall memcached 杀掉所有memcached
sudo service oagent stop oagent关闭
sudo service oagent start
ps -ef |grep memcached
查看memcache的命中率
1.telnet localhost 11211
2.stats
命中率=get_hits / cmd_gets
剔出率：evictions是否为0
