Garbage Collection Analysis workspace

This workspace displays data provided by the Garbage Collection Analysis attributes.

This workspace summarizes all the Java™ virtual machine (JVM) garbage-collector activity over a user-defined interval.

The JVM generates detailed garbage collection logs for an application server when started with the verbose:gc runtime parameter.

The predefined workspace contains the following items:
  • Garbage Collection Rate - History graph, which displays the rate at which the garbage-collection algorithm is being invoked
  • Heap Usage - History bar chart, which displays the high-water mark of free storage (in kilobytes) available in the heap after each garbage-collector run
  • Percentage of Time Garbage Collector Running - History graph, which displays the percentage of real time the garbage collector was running during the current interval, for each server region
  • Garbage Collection Analysis report, which displays information about the garbage-collection activities within the JVM that is hosting the application server. For example, this report displays the number of times the collector ran during the interval and the resulting number of objects that the collector freed

Accessing the Garbage Collection Analysis workspace

To access this workspace, complete the following steps:
  1. Within the Navigator, expand Windows Systems, Linux® Systems, z/OS® Systems, or UNIX Systems, as appropriate for the node you are monitoring.
  2. Within the node list, expand the entry that corresponds to the name of the node that you want to select.
  3. Within that node list of monitored applications, expand the list of WebSphere® agents.
  4. Within the list of available agents, expand the WebSphere application server of your choice.
  5. Within that server list of available WebSphere Application Server workspaces, click the Garbage Collection Analysis entry.

Accessing the managing server visualization engine from the Garbage Collection Analysis workspace

In the IBM® Cloud Pak System Software Monitoring Portal navigate to the Garbage Collection Analysis workspace. You can use the Diagnostic Server Activity Display link to access the managing server visualization engine.
  1. In the Garbage Collection Analysis window, right-click the choose link icon Choose link - link in a chain then click Diagnostic Memory Leak.
  2. If this is the first time you access the managing server visualization agent, you see a Welcome to the Application Monitor page.
  3. Depending on the user setup configuration in your environment you might have to type your managing server visualization engine User Name and Password. If you do, you must log in only once per session using your User Name and Password.
  4. Click OK to display the Memory Leak Confirmation report page in the managing server visualization engine. You can use this page to diagnose memory leak problems.
  5. In a z/OS environment, right-click the link icon on a row where the ASID column displays Summary.
    1. Click Garbage Collection Analysis Servant Regions.
    2. In the Garbage Collection Analysis - Servant Regions table, right-click the link icon on a row.
    3. Click Diagnostic Memory Leak.
  6. For information about Creating a Memory Leak Confirmation report in this page, and additional features refer to the Composite Application Manager help within the managing server visualization engine Interface.
  7. To return to the previous workspace in the IBM Cloud Pak System Software Monitoring Portal interface at any time choose from the following options:
    • From the IBM Cloud Pak System Software Monitoring Portal desktop client, including WebStart, click the back arrow on the Portal toolbar.
    • From the IBM Cloud Pak System Software Monitoring Portal browser client, click the browser back arrow.