The Top tab on the Monitoring panel of a selected realm node provides a view not unlike 'top' for Unix systems or the Task Manager for Windows-based systems. The Top panel gives you a high level view of realm usage, both from a connection perspective and a channel perspective.

You can view real-time graphs of realm memory usage, JVM GC stats, and CPU usage. This section also contains a summary showing the number of mounted realms, the number of resources, and the number of services.

The bottom section of the panel displays a series of tabs showing channel and connection usage throughout the realm.

The Top Channel Usage tab shows channel usage throughout the realm. Each row in the Top Channel Usage table represents a channel. Channel usage can be measured a number of ways. Each measurement corresponds to a column in the table. When you click one of the column headers, all known channels will be sorted according to their value for the selected column. For example, when you click the Connections column, the table will be sorted according to the number of consumers that each channel has. The channel with the most number of consumers will appear at the top of the table.

Channel usage measurements are described below:

The Top Connection Usage tab represents connection usage. Each row in the table represents a connection. A connection corresponds to the physical aspect of a Universal Messaging Session. Connection usage, like channel usage can be measured in a number of different ways. Each column in the table represents a type of measurement for a realm connection. Clicking on one of the column headers will cause the table of connections to be sorted according to the value of the selected column. For example, one of the columns is 'Events In', i.e. the number of events sent to the server by the connection. By clicking on the column header labeled 'Events In', the table will be sorted according to the number of events each connection has sent to the server. The connection with the most 'Events In' count will appear at the top of the table.

Connection usage measurements are described below:

The monitor panel provides a method of graphing both channel and connection usage. It uses a 3D graph package from sourceforge (http://sourceforge.net/projects/jfreechart/) to display the items in each table as columns in a 3D vertical bar chart. The bar charts can be update live as the values in the tables are updated. Once a column is selected, simply click on the button labeled 'Bar Graph' under either the channel or connections table and a graph panel will appear, as shown in the image below showing a graph of the number of events published for channels within a realm..

Right-clicking anywhere within the graph will show a pop-up menu of options. One of the options is labeled 'Start Live Update', which will ensure the graph consumes updates as and when they occur to the table. Once the live update is started, you can also stop the live update by once again right clicking on the graph and selecting 'Stop Live Update'.

You can also print the graph, and save the graph image as a '.png' file, as well as alter the properties of the graph and its axis.