JVM size on websphere

[Vaibhav Goel]

Hello there,

I am using IBM websphere version 5.1.2. I am currently working on a project in which Websphere is used. I created a module in which data is very large; about 1-2 lakhs records are there. So there was a memory dump problem.
How can I increase the size of JVM in Websphere or if somebody has better suggestion, then please tell me.

Regards,
Vaibhav Goel

[Steve Bidondo]

The easiest way to increase the JVM size of the app server in 5.1 is via the admin console.

Expand the Servers tree and click on Application Servers. In the app servers list, click on your app server name. Under additional properties, click on Process Definition. On the next screen, click on Java Virtual Machine. On the next screen, you can change the initial heap size and maximum heap size. Make sure to press Save.

Fyi, this is for WAS 6.1, but provides some useful memory analysis discussion: http://www.ibm.com/developerworks/websphere/library/techarticles/0706_sun/0706_sun.html

[Cameron Wallace McKenzie]

Indeed, configuring the Java Heap Size for WebSphere via the admin console is the best way to go. Bump that memory size up good, but not excessively.

Memory dumps can be very misleading in WebSphere and the Portal. It's not always a lack of memory, or memory suffocation. There are many seemingly innocuous problems that will trigger a Java Heap Dump.

Good luck!

-Cameron McKenzie