Health Summary workspace

The Health Summary workspace displays key performance metrics for each monitored Java™ virtual machine (JVM).

For each monitored JVM, garbage collection (GC) rates and other key performance metrics are displayed. The metrics are calculated over the last 5 minutes.

The Health Summary workspace uses the JVM Health Summary attribute group to populate the following views:
  • Garbage Collection Rates

    This bar chart shows the rate of garbage collections per minute for each JVM.

  • Proportion of Time in GC Pauses

    This bar chart shows the percentage of time that each JVM spent in garbage collection pauses.

  • Heap Occupancy After Global GC

    Shows the average percentage of heap that remains occupied after global garbage collections, during the last five minutes.

  • System Garbage Collections

    This bar chart shows the number of garbage collections for each JVM that were forced by the system.

  • General CPU Usage

    This bar chart shows the percentage of the processing time for each JVM that occurred on general-purpose processors.

  • zIIP on CP Usage

    This bar chart shows the percentage of the processing time for each JVM that occurred on general-purpose processors, but was eligible to run on specialized zIIP processors.

  • Thread Counts

    This bar chart shows the number of active threads that are in each JVM.

  • Threads Blocked

    This bar chart shows the number of threads that are blocked in each JVM.

  • Lock Utilization

    This bar chart shows the highest lock usage value for each JVM. The lock usage value is the percentage of time that a lock was held.

  • Lock Missed

    This bar chart shows the highest lock missed percentage for each JVM. The lock missed percentage reflects the number of waits for a lock.

  • Average Lock Hold Times

    This bar chart shows the highest average lock hold time for each JVM. The average lock hold time is the average amount of time that a lock was held.

  • Health Summary

    This table view shows key performance metrics for each monitored JVM. From this view, you can navigate to the Environment Data, Lock Statistics, Thread Statistics, and Historical Health Summary workspaces. Depending on JVM, you can also navigate to the WebSphere Liberty Profile and z/OS Connect workspaces.