tomcat优化启动参数：JAVA_OPTS="-server -Xms4g -Xmx4g -Xss512k -Xmn1g
-XX:CMSInitiatingOccupancyFraction=65 -XX:+UseFastAccessorMethods
-XX:+AggressiveOpts -XX:+UseBiasedLocking -XX:+DisableExplicitGC
-XX:MaxTenuringThreshold=10 -XX:NewSize=2048M -XX:MaxNewSize=2048M
-XX:NewRatio=2 -XX:PermSize=128m -XX:MaxPermSize=512m
-XX:CMSFullGCsBeforeCompaction=5 -XX:+ExplicitGCInvokesConcurrent
-XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSParallelRemarkEnabled
-XX:+UseCMSCompactAtFullCollection -XX:LargePageSizeInBytes=128m
-XX:+UseFastAccessorMethods"