longer ParNew collection in JDK8?

[Yu Zhang]

Joy,

I saw this blog post, it might be helpful to you.
https://blogs.oracle.com/poonam/entry/longer_young_collections_with_jdk7

Thanks,
Jenny

On 1/29/2015 10:27 AM, Joy Xiong wrote:
>
> Hi,
>
> We recently move our services from JDK6 to JDK8, but observe longer 
> ParNew GC pause in JDK8. For example, the pause time increase from 
> 27ms to 43ms in one service. The service has the JVM parameters as below:
> -Xms32684m -Xmx32684m -XX:NewSize=2048m -XX:MaxNewSize=2048m 
> -XX:+UseConcMarkSweepGC -XX:+UseParNewGC 
> -XX:CMSInitiatingOccupancyFraction=70 -XX:SurvivorRatio=2 
> -XX:+AlwaysPreTouch -XX:+UseCompressedOops 
> -XX:+PrintTenuringDistribution -XX:+PrintGCDetails 
> -XX:+PrintGCDateStamps -Xloggc:logs/gc.log 
> -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCApplicationConcurrentTime
>
> Is this longer ParNew pause expected? Any suggestions to mitigate the 
> longer pause?
>
> thanks,
> -Joy
>
>
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