vjstar添加主动GC功能| Proactive GC task added to vjstar

[lixuanbin]

很多时候，JVM自动回收腊鸡是件美好的事情，但是在业务高峰的时候偏偏发现老年代已经接近触发CMS阀值，就有点让人焦躁了吧？我们为什么不在流量低谷的时候主动清扫下内存里面无用的老家伙们呢？ | Garbage collection is a good thing, JVM will do most of the dirty stuff for us. But when our system is at its peak moment and is making millions of dollars every second, we might get frustrated to see the garbage collector is yelling to "stop-the-world". Why don't we do it more proactively, for example, try to trigger a GC when our system is snoring?