JVM Garbage Collection attributes

Use the JVM Garbage Collection attributes to view garbage collection data for a monitored Java virtual machine (JVM) that is summarized over the last 5 minutes.

Allocation Failure Count Indicates the number of allocation failures that occurred in the interval.

ASID Indicates the hexadecimal address space ID of the job or started task that is hosting the Java virtual machine (JVM).

Avg Collection Interval Indicates the average interval in seconds between garbage collections.

Avg Global Collection Interval Indicates the average interval in seconds between global garbage collections.

Avg Global Pause Time Indicates the average global garbage collection pause time in seconds.

Avg Nursery Collection Interval Indicates the average interval in seconds between nursery garbage collections.

Avg Nursery Pause Time Indicates the average nursery garbage collection pause time in seconds.

Avg Occupancy Percent Indicates the average percentage of heap that was in use after garbage collection.

Avg Partial Collection Interval Indicates the average interval in seconds between partial garbage collections. This attribute applies to a balanced garbage collection policy.

Avg Partial Pause Time Indicates the average partial garbage collection pause time in seconds. This attribute applies to a balanced garbage collection policy.

Avg Pause Time Indicates the average garbage collection pause time for the sample period in seconds.

Collection Count Indicates the total number of garbage collections that occurred during the sample period.

Collection Mode Indicates the mode of garbage collection. Valid values include BALANCED, GENCON, OPTAVGPAUSE, OPTTHRUPUT, and UNKNOWN. The BALANCED mode is available only on 64-bit JVMs.

Collections per Minute Indicates the rate of garbage collections per minute.

Collector ID Indicates the identifier of the OMEGAMON Monitoring for JVM collector.

Concurrent Collection Count Indicates the number of concurrent garbage collections that occurred in the sample period.

Final References Cleared Count Indicates the number of final references that were cleared during the sample period.

Global Collection Count Indicates the total number of global garbage collections that occurred during the sample period.

Global Mark Phase Avg Collection Interval Indicates the average interval in seconds between global mark phase (GMP) collections. This attribute applies to a balanced garbage collection policy.

Global Mark Phase Avg Pause Time Indicates the average global mark phase collection pause time for the sample period in seconds. This attribute applies to a balanced garbage collection policy.

Global Mark Phase Avg Collections per Cycle Indicates the average number of global mark phase collections that occurred in a cycle during the sample period. This attribute applies to a balanced garbage collection policy.

Global Mark Phase Collection Count Indicates the total number of global mark phase collections that occurred during the sample period. This attribute applies to a balanced garbage collection policy.

Global Mark Phase Cycle Count Indicates the number of global mark phase cycles that occurred during the sample period. This attribute applies to a balanced garbage collection policy.

Job Name Indicates the name of the job or started task that is hosting the JVM.

Managed System Identifies the node that represents the system where the JVM data was collected. The value is a text string of up to 32 alphanumeric characters that combines the Collector ID and the SMF ID in the following format: Collector_ID:SMF_ID:JVM.

Max Heap Size Indicates the maximum heap size in bytes for the interval.

Max Pause Time Indicates the maximum pause time in the sample period in seconds.

Max Used Heap Indicates the maximum used heap size in bytes for the interval.

Mean Heap Size Indicates the average heap size in bytes over the interval.

Mean Used Heap Indicates the average used heap size in bytes over the interval.

Min Heap Size Indicates the minimum heap size in bytes for the interval.

Min Pause Time Indicates the minimum pause time in the sample period in seconds.

Min Used Heap Indicates the minimum used heap size in bytes for the interval.

Nursery Amount Flipped Indicates the amount of nursery heap in bytes that was converted to tenured heap during the sample period.

Nursery Collection Count Indicates the total number of nursery garbage collections that occurred during the sample period.

Partial Collection Count Indicates the total number of partial garbage collections that occurred during the sample period. This attribute applies to a balanced garbage collection policy.

Percent Time in Collection Pauses Indicates the percentage of time that was spent in garbage collection pauses.

Percent Time Unpaused Indicates the percentage of time that was spent unpaused.

Process ID Indicates the UNIX System Services process ID (PID) of the JVM.

Sample Period Indicates the sample period (interval) in seconds for the garbage collection summary.

SMF ID Indicates the System Management Facility (SMF) identifier of the LPAR.

Synchronous Collection Count Indicates the total number of synchronous garbage collections that occurred during the sample period. This attribute applies to a balanced garbage collection policy.

System Collection Count Indicates the total number of garbage collections that were forced by the system during the sample period.