防止OOM问题出现的几种方法，可以在很大程度上减少程序宕机现象发生的几率，尤其是在系统部署后，大量用户使用的情况下，效果会更明显。
Several methods which can avoid OOM problems can reduce the rate of procedure downtime . The effect will be more obvious when the system is deployed and lots of users operate it .
宕机现象