Java engine Memory Management
Do not set exceptionally high max heap value for Java server process !
The reason why big heaps (4g for example) are not recommended is that the bigger the heap the longer it takes for the garbage collector to run through it. So there is a trade off between less gc-s in the beginning when the JVM is started and much longer ones, when the heap is for example half full. Therefore, larger max heap doesnt related to better performance. If you have huge resource, you add more server nodes you can scale more easily and serve a larger number of users.
a. 723909 – Java VM settings for J2EE 6.40/7.0
b. 876722 – Java heap size doesn’t update or appears twice in cofig tool
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