Follow these steps to monitor an application servers heap utilization using the Tivoli Performance Monitor in the WebSphere admin console.

1. In the WebSphere admin console, select Monitoring and Tuning > Performance Viewer > current activity.
2. Select your application server.
3. Expand Performance Modules and checkmark JVM Runtime.
4. Select View Modules.

A graph will be displayed that contains the max heap of the application server (red line) and the used heap (blue line).