https://bz.apache.org/bugzilla/show_bug.cgi?id=66051
Bug ID: 66051
Summary: JMeter Produces Negative Results
Product: JMeter
Version: 5.3
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: HTTP
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: JMETER_5.5
I came across this issue in JMeter where it would provide negative results when
calling the getTime() method in SampleResult.java. I suspect this may be an
issue with how elapsedTime is calculated in setEndTime() with the calculated
parameters that are fed into this method from addSubResult(), as this method
does some calculations with nanoTimeOffsets, which my JMeter configuration is
currently set to utilize.
https://github.com/apache/jmeter/blob/aaead67610cd61d486d6ae54dab7b05338bcf40a/src/core/src/main/java/org/apache/jmeter/samplers/SampleResult.java#L655
I thought another thing that may be related to the issue is truncation in the
long data-type divison in sampleNsClockInMs(), but it seems this would only
cause a small offset from the actual result but I have had Jmeter produce
results up to -229 ms.
When the results come back negative, the values are also identical across
AverageResponseTime, MinResponseTime, MaxResponseTime, Percentile50,
Percentile90, and Percentile95.
As far as the configuration for the settings that affect the SampleResults, the
only one I have configured is: sampleresult.timestamp.start=true
The defaults are being used for the rest of the sampleresult settings.
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