longer ParNew collection in JDK8?

[Jon Masamitsu]

Joy,

Is your application such that most everything dies in the
young generation and very little is promoted?  If yes,
do you know if there is a difference in how much is
promoted between the two releases?

Jon

On 01/29/2015 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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