Java垃圾收集器

Question

这个问题已经有答案了:

已关闭 12 年前。

Possible Duplicate:
Java garbage collector - When does it collect?

当人们说 Java 中的垃圾收集器降低了整个应用程序的速度时，他们真正的意思是什么？垃圾收集器不是只有在对象被释放时才会触发吗？请帮助我理解。谢谢!

Answer 1

看看http://developers.sun.com/mobility/midp/articles/garbage/

As Java technology becomes more and more pervasive in the telecommunications (telco) industry, understanding the behavior of the garbage collector becomes more important. Typically, telco applications are near-real-time applications. Delays measured in milliseconds are not usually a problem, but delays of hundreds of milliseconds, let alone seconds, can spell trouble for applications of this kind. Quite simply, sub-optimal performance translates directly into loss of revenue.

基本上，如果垃圾收集器压缩一个小堆，那么延迟很短，但如果您生成了大量垃圾，并且有一个很大的可到达对象图，您就会看到很大的延迟。新的垃圾收集算法(分代/增量 GC)在一定程度上缓解了这一问题，但调整 GC 仍然有些玄学。