JVM参数调优

-server -Xms22g -Xmx22g -Xmn12g -XX:PermSize=512m -XX:MaxPermSize=1600m
-XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=80 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=6 -XX:+DisableExplicitGC
-XX:-OmitStackTraceInFastThrow
-XX:MaxTenuringThreshold=20 -XX:ParallelGCThreads=16 
-XX:+CMSScavengeBeforeRemark
-XX:+UseCMSInitiatingOccupancyOnly
-verbose:gc -Xloggc: gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps