V8中的垃圾收集器和并发标记 [英] Garbage Collector and concurrent marking in V8

问题描述

我在此处了解有关V8 GC的信息.由于这个新的GC使用工作线程执行并发标记，所以我想知道当cpus> 1时总体性能是否更好.GC会运行得更快吗?有没有人比较这两种情况?

I'm reading about V8 GC here. As this new GC uses workers threads to perform concurrent marking I wonder if the overall performance is better when there is > 1 cpus. Will GC run faster ? Has anyone compared both scenarios ?

我的应用未群集.

推荐答案

是的，如果您有多个CPU内核，则只能从并发操作(在V8或其他地方)中获得速度上的好处.

Yes, you will only get a speed benefit from concurrent operations (in V8 or elsewhere) if you have more than one CPU core.

实际的性能影响取决于您应用程序的具体情况，因此，如果您想要实际适用于您的案例的结果，则必须自己进行衡量.粗略估计，我希望整体吞吐量差异达到百分之几":大多数JavaScript是单线程的，并且在大多数应用中，垃圾回收约占CPU负载的2-10％.

The actual performance impact depends on the specifics of your app, so you'll have to measure it yourself if you want results that actually apply to your case. As a rough guess, I would expect "a couple percent" of overall throughput difference: most of JavaScript is single-threaded, and in most apps garbage collection accounts for about 2-10% of CPU load.

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