Increase Heap Memory in Websphere(97/285 technotes fpr 2015)

Method 1: Using the administrative console

Open the administrative console.

Navigate to Servers > Server Types > WebSphere application servers > <servername>

Navigate to Server Infrastructure > Java and Process Management > Process Definition

Navigate to Additional Properties > Java Virtual Machine > General Properties

Define the values (in MB) for ‘Maximum heap size’ and/or ‘Initial heap size’.

Restart the server.

Note: If the heap size is already low, the administrative console might not open. In such cases, use some other method to configure the heap size.

Method 2: By editing the configuration files

This method should be used with caution.

Search for a file named server.xml in your WebSphere installation.

Generally, the location of this file is as follows:

<profilehome>/config/cells/<cellname>/nodes/<nodename>/servers/<servername>/server.xml

Select the server.xml specific to your server and edit it to add/modify/delete the attributes @initialHeapSize and @maximumHeapSize of the element <jvmEntries> The value of these attributes is the heap size in MB.

For example:

<jvmEntries ... initialHeapSize="2048" maximumHeapSize="3072" ...>
 ...
 </jvmEntries>

Restart the server after saving the changes to server.xml.

References:

https://blakboard.wordpress.com/2013/05/15/how-to-configure-heap-size-for-websphere-application-server/