-server
-Xms3550m -Xmx3550m -Xmn2g
-XX:PermSize=128m
-XX:MaxPermSize=320m
-XX:SurvivorRatio=8
-verbose:gc
-Xloggc:/opt/logs/xxx/app-gc.log
-XX:+PrintGCDetails
-XX:+PrintGCDateStamps
-XX:+PrintGCTimeStamps
-XX:-OmitStackTraceInFastThrow
-XX:+PrintGCApplicationStoppedTime
-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=70
-XX:+UseCMSCompactAtFullCollection
-XX:+CMSParallelRemarkEnabled
-XX:+CMSClassUnloadingEnabled
-XX:SoftRefLRUPolicyMSPerMB=0