longer ParNew collection in JDK8?

[Joy Xiong]

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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