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Question

 Jean-Didier Boeri (Jean-DidierB0057)
Air France

Air France
FR
Jean-DidierB0057 Member since 2018 1 post
Air France
Posted: Apr 17, 2018
Last activity: Apr 27, 2018
Posted: 17 Apr 2018 4:54 EDT
Last activity: 27 Apr 2018 2:22 EDT
Closed
Solved

Negative values in PAL reading

Hello,

While doing some performance analysis with PAL, I'm getting some negative values in PAL readings (see capture).

You can please help me to understand if this is the expected behaviour or if there is something wrong in my measures.

Thanks for your help

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System Administration

  • Arunkumar Velmurugan Rajasekhar Pentakota

Accepted Solution

Posted: 6 years ago
Posted: 18 Apr 2018 16:41 EDT
Chandrasekhar Gollamudi VN (chandrasekhar_g)
PEGA
Senior Manager, Technical Support - Runtime Engine and Search
Pegasystems Inc.
IN

Hi, 

It is 100% the cause of the issue. The performance gadget keeps a copy of the last set of PAL stats in memory on the client machine in IE. When we passivate a requestor we persist PAL to perf-stats, serialize/passivate the requestor and remove the requestor from the server completely. When the requestor is activated it starts with new PAL. When the performance gadget requests the PAL it tries to delta the old copy vs. the new and you get negative numbers. The best any bug fix could do here is give you all 0's after passivation, but even that would be a low priority change because this use pattern should never happen. 

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Posted: 6 years ago
Posted: 25 Apr 2018 8:23 EDT
Jean-Didier Boeri (Jean-DidierB0057)
Air France

Air France
FR
Hello Chandra, Thanks for your reply. You meant that a passivation occurs between my PAL readings ? After each passivation, the readings are reset according to you. My test duration is about 1 minute length. I'm unlucky if a passivation has occured. I'll continue my investigation. Thanks for your answer.
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