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Posted to user@jmeter.apache.org by kbluekens <kb...@hotmail.com> on 2009/05/12 21:57:41 UTC
Aggregrate report: calculation of Total for Average
When looking at the TOTALS in the standard Aggregrate Report, I am unable to
figure out how TOTALS for the Average column is calculated.
Counting up all average reponse times for each line item divided by the
number of line items yields a different number than the TOTALS calculated in
the response.
Why is there this discrepancy? It this Jmeter overhead time not reflected in
line items?
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Re: Aggregrate report: calculation of Total for Average
Posted by sebb <se...@gmail.com>.
On 13/05/2009, aidy lewis <ai...@googlemail.com> wrote:
> HI Sebb,
>
> 2009/5/13 sebb <se...@gmail.com>:
>
>
> >> Would it be possible to Wiki how the calculations are formed through
> >
> > Anyone can Wiki, but I think the place is in the supplied
> > documentation (BTW which has been updated for the forthcoming
> > release).
>
>
> Will this information be in the next release of the documentation?
I have added quite a bit; whether it is enough or not I don't know.
If you want to look at it, the nightly builds have the docs.
> Without stepping through the code I do not have enough information to
> provide these details on the Wiki.
>
>
> >> the Listeners and when they are exported, as this leads to a lot of
> >> confusion with Jmeter users?
> >
> > What do you mean by "when they are exported"?
>
>
> I understand that when some Listeners are saved to a table some
> rows are calculated from raw data.
The data saved by a listener is always raw data. Some listeners have a
button that allows the displayed data to be saved.
>
> >> And leads to some falsely criticising Jmeter reporting.
> >
> > That will always happen...
>
>
> Maybe so, but an easy point of reference would silence some detractors.
>
>
> Aidy
>
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Re: Aggregrate report: calculation of Total for Average
Posted by aidy lewis <ai...@googlemail.com>.
HI Sebb,
2009/5/13 sebb <se...@gmail.com>:
>> Would it be possible to Wiki how the calculations are formed through
>
> Anyone can Wiki, but I think the place is in the supplied
> documentation (BTW which has been updated for the forthcoming
> release).
Will this information be in the next release of the documentation?
Without stepping through the code I do not have enough information to
provide these details on the Wiki.
>> the Listeners and when they are exported, as this leads to a lot of
>> confusion with Jmeter users?
>
> What do you mean by "when they are exported"?
I understand that when some Listeners are saved to a table some
rows are calculated from raw data.
>> And leads to some falsely criticising Jmeter reporting.
>
> That will always happen...
Maybe so, but an easy point of reference would silence some detractors.
Aidy
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Re: Aggregrate report: calculation of Total for Average
Posted by sebb <se...@gmail.com>.
On 13/05/2009, aidy lewis <ai...@googlemail.com> wrote:
> Sebb et al
>
> 2009/5/12 sebb <se...@gmail.com>:
>
>
> >
> > Try multiplying the average in each line by the number of samples in
> > that line, then add all the values together. Then calculate the
> > average, and it will be close to the total average. The sum of all the
> > individual counts will of course be the same as the total count, but
> > the average may vary due to rounding.
> >
>
>
> Would it be possible to Wiki how the calculations are formed through
Anyone can Wiki, but I think the place is in the supplied
documentation (BTW which has been updated for the forthcoming
release).
> the Listeners and when they are exported, as this leads to a lot of
> confusion with Jmeter users?
What do you mean by "when they are exported"?
> And leads to some falsely criticising Jmeter reporting.
That will always happen...
> Aidy
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>
>
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Re: Aggregrate report: calculation of Total for Average
Posted by aidy lewis <ai...@googlemail.com>.
Sebb et al
2009/5/12 sebb <se...@gmail.com>:
>
> Try multiplying the average in each line by the number of samples in
> that line, then add all the values together. Then calculate the
> average, and it will be close to the total average. The sum of all the
> individual counts will of course be the same as the total count, but
> the average may vary due to rounding.
>
Would it be possible to Wiki how the calculations are formed through
the Listeners and when they are exported, as this leads to a lot of
confusion with Jmeter users?
And leads to some falsely criticising Jmeter reporting.
Aidy
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Re: Aggregrate report: calculation of Total for Average
Posted by sebb <se...@gmail.com>.
On 12/05/2009, kbluekens <kb...@hotmail.com> wrote:
>
> When looking at the TOTALS in the standard Aggregrate Report, I am unable to
> figure out how TOTALS for the Average column is calculated.
>
> Counting up all average reponse times for each line item divided by the
> number of line items yields a different number than the TOTALS calculated in
> the response.
>
> Why is there this discrepancy? It this Jmeter overhead time not reflected in
> line items?
The total line is calculated exactly the same as the other lines,
except that all samples are included rather than all samples with the
same label.
You can't calculate averages of averages by merely adding them.
Try multiplying the average in each line by the number of samples in
that line, then add all the values together. Then calculate the
average, and it will be close to the total average. The sum of all the
individual counts will of course be the same as the total count, but
the average may vary due to rounding.
> --
> View this message in context: http://www.nabble.com/Aggregrate-report%3A-calculation-of-Total-for-Average-tp23509266p23509266.html
> Sent from the JMeter - User mailing list archive at Nabble.com.
>
>
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>
>
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