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Air France
Posted: April 17, 2018
Last activity: April 27, 2018
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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
Posted: 2 years ago
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.
Posted: 2 years ago
Hi Jean-Didier,
After your investigation ,please let me know if you have any further queries.
Thanks.
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.