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Posted to user@jmeter.apache.org by "Kuronen, Keijo" <ke...@sap.com> on 2014/08/08 06:43:27 UTC
Summary report showing negative Min value
Hi,
I am using JMeter 2.11 with Windows.
When started a non-GUI test I was surprised that summary report showed negative value for Min.
My test script is quite simple.
-start 100 threads with some initialization tasks
-synchronizing timer
-threads perform looping some "typical" http actions: GET, POST, DELETE
2014/08/08 06:53:00 INFO - jmeter.reporters.Summariser: summary + 2329 in 7s = 343,1/s Avg: 21 Min: -207 Max: 1363 Err: 0 (0,00%) Active: 100 Started: 101 Finished: 1
2
Is this a known issue?
Regards,
Keijo
Re: Summary report showing negative Min value
Posted by Philippe Mouawad <ph...@gmail.com>.
Thanks Kirk for this very interesting answer.
@Keijo, it has already been reported but we closed it as reporter didn't
provide enough details nor answer our questions.
If you are able to validate Kirk theory it would be nice to comment here:
- https://issues.apache.org/bugzilla/show_bug.cgi?id=39860
Regards
Philippe
@philmdot
On Friday, August 8, 2014, Kirk Pepperdine <ki...@gmail.com>
wrote:
> Hi,
>
> This is most likely due to the timers your kernel is configured to use or
> NTP if you have that configured. The behavior of timers in Java cannot be
> specified in the JLS as the behavior is both hardware/OS dependent/NTP.
> Further more, certain configurations cause the call to go off CPU. On CPU
> support requires threads to return to the same core (depending upon which
> clock you're configured to use and which model/rev of CPU you are using).
> So, there are all kinds of subtleties than mean more often than not the
> values reported will be wrong... hopefully not significantly wrong but... And
> unfortunately there isn't much you can do about it but try to know which
> clock your kernel is configured to use and if NTP is running.
>
> Regards,
> Kirk
>
> On Aug 8, 2014, at 6:43 AM, Kuronen, Keijo <keijo.kuronen@sap.com
> <javascript:;>> wrote:
>
> > Hi,
> >
> > I am using JMeter 2.11 with Windows.
> >
> > When started a non-GUI test I was surprised that summary report showed
> negative value for Min.
> >
> > My test script is quite simple.
> > -start 100 threads with some initialization tasks
> > -synchronizing timer
> > -threads perform looping some "typical" http actions: GET, POST, DELETE
> >
> > 2014/08/08 06:53:00 INFO - jmeter.reporters.Summariser: summary +
> 2329 in 7s = 343,1/s Avg: 21 Min: -207 Max: 1363 Err: 0
> (0,00%) Active: 100 Started: 101 Finished: 1
> > 2
> >
> > Is this a known issue?
> >
> > Regards,
> > Keijo
> >
>
>
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> <javascript:;>
>
>
--
Cordialement.
Philippe Mouawad.
Re: Summary report showing negative Min value
Posted by Kirk Pepperdine <ki...@gmail.com>.
Hi,
This is most likely due to the timers your kernel is configured to use or NTP if you have that configured. The behavior of timers in Java cannot be specified in the JLS as the behavior is both hardware/OS dependent/NTP. Further more, certain configurations cause the call to go off CPU. On CPU support requires threads to return to the same core (depending upon which clock you’re configured to use and which model/rev of CPU you are using). So, there are all kinds of subtleties than mean more often than not the values reported will be wrong… hopefully not significantly wrong but… And unfortunately there isn’t much you can do about it but try to know which clock your kernel is configured to use and if NTP is running.
Regards,
Kirk
On Aug 8, 2014, at 6:43 AM, Kuronen, Keijo <ke...@sap.com> wrote:
> Hi,
>
> I am using JMeter 2.11 with Windows.
>
> When started a non-GUI test I was surprised that summary report showed negative value for Min.
>
> My test script is quite simple.
> -start 100 threads with some initialization tasks
> -synchronizing timer
> -threads perform looping some "typical" http actions: GET, POST, DELETE
>
> 2014/08/08 06:53:00 INFO - jmeter.reporters.Summariser: summary + 2329 in 7s = 343,1/s Avg: 21 Min: -207 Max: 1363 Err: 0 (0,00%) Active: 100 Started: 101 Finished: 1
> 2
>
> Is this a known issue?
>
> Regards,
> Keijo
>
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