NewRatio参数不适用于CMS垃圾收集器 [英] NewRatio parameter not working with CMS garbage collector

问题描述

我转换到CMS收集器为我的应用程序和应用程序的吞吐量减少了一半。从GC日志中，我发现小GC发生的频率很高（小于code> 10每秒）。我已经分配了一个堆大小 4G 。 JVM默认使用非常小的尺寸（小于 40MB ）。我想通过增加年轻gen的大小来尝试CMS。你能指出我对这个JVM参数吗？

• 我尝试了-XX：NewRatio，但JVM忽略了这个参数，并且年轻的gen size没有变化
  
• 我的Java版本是 java版本1.6.0_14

解决方案

您是如何设置 -XX：NewRatio 以及哪个JVM版本的？

反正。如果您还设置了 -XX：MaxNewSize = size 这是一项功能，或者您还将 -XX：+设置为UseConcMarkSweepGC 这是已知错误。

I switched to CMS collector for my application and throughput of application decreased by half. From GC logs, I see a high frequency of minor GCs happening (aroung 10 per second ). I have allocated a heap size of 4G. The JVM be default is using very small size for young gen (less than 40MB ). I want to try out CMS via increasing the size of young gen. Can you point me to right JVM parameter for this.

• I tried -XX:NewRatio but JVM ignored this parameter and there was no change in young gen sizes
• My java version is java version "1.6.0_14"

解决方案

How did you set -XX:NewRatio, and on which JVM version?

Anyway. It could be ignored if you are also setting -XX:MaxNewSize=size, which is a feature, or if you are also setting -XX:+UseConcMarkSweepGC which is a known bug.

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