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Status Future consideration
Workspace z/OS
Categories LE
Created by Guest
Created on Feb 22, 2018

RELATED IDEAS

Monitor the z/OS Language Environment Heap Usage

The usage/allocation of the LE Heap storage would affect the performance of the IBM CMOD product that is using it. In the reported case, when the LE Heap is not properly tuned, high CPU consumed by the CMOD address space is observed. Although the LE runtime RPTSTG(ON) option provides a mean to generate report for tuning recommendation, this option is not recommended to be run in long period in production. Also there is no alert message generated when the Heap storage is fragmented (e.g. multiple incremental Heap segments created) after the CMOD has been running for some time.

So an instrumentation to monitor and alert the LE Heap storage usage/allocation is needed. For instance,
- LE creates SMF records or some other means to capture the HEAP usage at a predefined time period.
- Generates alert/exception messages when the Heap usage exceeds certain threshold, or the Heap is too fragmented.
- LE provides commands to interactively checking the current Heap usage condition in an address space (e.g. CMOD in this case).
Note: The prerequisite of these enhancements is to ensure the impact to the system is at minimum.

Idea priority High

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