Bug 641025 – Incremental GC 已经在每小时版本实现

　Incremental Garbage Collection的原理是Garbage Collection能够定期释放掉程序本该释放的内存空间，这是一项非常重要的技术。但是这个过程可能会导致电脑死机。Incremental Garbage Collection能够将这个过程剪切成不同的步骤，从而减少暂停时间。据测试人员表示，“Google使用V8基准来测试JavaScript性能，并且证实了它的成功。在我们的测试中，要呈现一个完整的框架，最大的时间值从原来暂停的272毫秒降低到50毫秒。”。

　　而更为难能可贵的是，相比于一个更为庞大的JavaScript项目，要提高Google的交互性性能可谓是难上加难。因为这需要释放更大的内存空间。Chrome却力压群敌，做到了这一点。

　　另一大浏览器厂商Mozilla同样致力于Incremental Garbage Collection的工作，“这个技术很难实现，我们不知道会有多少艰难险阻，但我们会朝着目标努力。“

Garbage collection periodically frees up memory that a program claimed but didn't release, a very useful technology. But that process can hang up a computer while memory is tidied up. Incremental garbage collection breaks the process up into steps to reduce the pauses.

Google measured its success with one of its V8 benchmark tests of JavaScript performance. "In our testing the maximum time to render a frame including pause time is reduced from 272 milliseconds to 50 milliseconds," the programmers said.

Good interactive performance is harder to achieve with larger JavaScript programs, because a larger amount of memory must be swept.

Mozilla also is working on incremental garbage collection. "This stuff is hard, and we don't know how much tuning work there will be, but we're currently targeting IGC landing for Firefox 11," Mandelin said.

fang5566：这段话应该是很早说的吧，最后一段说目标是在 Firefox 11 实现，很显然 Firefox 11 是不可能实现的。回到原帖