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hasMessages API call in recalculateAndSave increases CPU usage

SA-12468

Summary



The recursive nature of hasMessages API negatively impacts CPU usage, response time and scalability in the application. HFix-22496 is installed which adds logic to bypass some expensive processing into utility function hasMessages. The out-of-the-box final Activity, Work-RecalculateAndSave, step 5, triggers hasmessage processing directly through API.
In unit tests, it is observed that .75 CPU seconds is spent in this single Activity step.

After a private checkout and applying the logic from HFix-22496 into this Activity, time and CPU cost was
reduced by 66% (to .25 seconds).

Error Messages



Not Applicable

Steps to Reproduce



Traces taken during Wrap-Up display high CPU cost.

Root Cause



The root cause of this issue was the explicit call to hasMessages() API taking more time because of auto-populate chaining.

Resolution



This issue is resolved by HFix-22869 which has changes in Work-RecalculateAndSave Activity disabling auto-populate while calling hasMessages() and restoring the previous value again.

Published July 29, 2015 - Updated October 8, 2020

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