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jvmwebsphereheap-memory

Java Virtual Machine "Maximum heap size" vs. Generic JVM argument Xmx

I am in WebSphere admin console under: Application servers > as-name > Process definition > Java Virtual Machine.

There is a field "Maximum heap size".

There is a field carrying "Generic JVM arguments", where I can add the -Xmx argument to define the max heap.

what is the difference between the two options to specify the max heap?

Solution

  • There is no difference. In practice, the "Maximum heap size" field is converted to the appropriate -X argument when the server launcher builds the command to launch the Java executable. The attribute on the JVM configuration panel is simply a more user-friendly way to specify that value than having to manage your own -X arguments.