WebSphere Application Server & Liberty

WebSphere Application Server & Liberty

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  • 1.  JVM Heap size Allocation

    Posted Tue September 17, 2013 12:19 PM
    Hi  All

        I have 2 JVM on 1 Box How can i allocate Heap size for the 2 JVM in 32 bit and 64 bit Operating system.   Tell me the minimum and mximum I can allocate.


    Thanks



  • 2.  JVM Heap size Allocation

    Posted Tue September 17, 2013 03:01 PM
    The maximum heap on a 32bit is 2GB and there is no cap  for max on the 64 GB JVM.

    The standard is to utilize only half of the heap of what your physical server has?

    you need to use  GC and memory visualizer  tools to determine the appropriate minimal and maximum heap for your application.

    Try this / or smilar

    www.ibm.com/developerworks/java/jdk/tool...


  • 3.  JVM Heap size Allocation

    Posted Tue September 17, 2013 04:14 PM
    Also you can make this a guideline:

    Size your Java heap so that your application runs with a minimum heap usage of 40%, and a maximum heap usage of 70%.

    And

    total_RAM / 2 / number_of_servers = maximum_heap_size
     


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