jvm 參數設置-優化

set HEAP=-Xms512m -Xmx2048m
set NEW=-XX:NewSize=128m -XX:MaxNewSize=128m
set SURVIVOR=-XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=50%
set TENURING=-XX:MaxTenuringThreshold=2

http://stackoverflow.com/questions/22455562/what-set-the-value-of-jvm-parameter-maxnewsize-ergonomics

The parameters NewSize and MaxNewSize bound the young generation size from below and above. Setting these equal to one another fixes the young generation, just as setting -Xms and -Xmx equal fixes the total heap size. This is useful for tuning the young generation at a finer granularity than the integral multiples allowed by NewRatio.