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Consistent high CPU utilization



System administrator reported consistent high CPU Utilization.

administrator checks log one can see PEGA0028 alert is generated along with PEGA0004. Collection usage threshold exceeded for long-lived object memory pool.

Error Messages

Collection usage threshold exceeded for long-lived object memory pool (CMS Old Gen) INFO:MemoryPool=CMS Old Gen;PoolType=long-lived object;;TimeStamp=2016-10-05 02:36:03,598 GMT;Count=737;NotificationSequenceNo=737;Threshold=2899102924;Used=3015188624;Max=3221225472;Committed=3221225472;Init=3221225472;

Steps to Reproduce

Not applicable

Root Cause

Upon analyzing log, it can be seen that free memory was very low where as requestor count is very high.


Increase the heap memory size to resolve the issue. 

Published January 4, 2017 - Updated October 8, 2020

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