Regarding 'Total' row of 90% Line column in Aggregate Report

[Manoj Kapuganti]

Hello Everyone,

Could you please let me know how 'Total' row of '90% Line' column is calculated in Aggregate report

Below is from http://jmeter.apache.org/usermanual/component_reference.html#Aggregate_Report

If you observe below image, 'Total' row of '90% Line' column, its 421

But 90% line of 328 and 437 is 426.1

Thank you,

Manoj Kapuganti

[Manoj Kapuganti]

Nobody knows this???

[Vincent Daburon]

Hi,

What is the 90th-percentile ?
http://softwaretesttips.com/2011/04/11/what-is-the-90th-percentile-and-how-is-it-calculated/

Regards.
Vincent D.

[Manoj Kapuganti]

Hey my question is not about 90% line

I am showing up a bug in Aggregate report

Thank you,

Manoj

[Vladimir Sitnikov]

Manoj,

>But 90% line of 328 and 437 is 426.1

It does not work that way.

1) "Total row of 90% column" is 365, not 421 as you state. Please
double check the screenshot.
2) It is computed exactly as Vincent described, however it uses _all
554 individual samples_, not just two "134 and 382" (the ones for 90%
of Home Page and 90% of Changes).

Vladimir

[Manoj Kapuganti]

While creating initial post I have image url as reference while attaching that screenshot in post. It got changed on JMeter site and hence its changed here too

Let me rephrase my question again with the current screenshot on http://jmeter.apache.org/images/screenshots/aggregate_report.png

From above image 90% line of 'Home Page' is 134 and 'Changes' is 375

If you compute 90% for 134 and 375 it will be 350.9

If you check above image it shows 365 against TOTAL of 90% line

So could you please let me know why it's 365 instead of 350.9

I kindly request you to please explain me how you calculated to get 365

Similarly if average of 131 and 339 is 235 which is correct. Min of 119 and 231 is 119. Max of 631 and 423 is 631. All are self explanatory except 90%, 95% and 99%

Below is the formula I used to compute 90% line =PERCENTILE(array,k)

Thank you,

Manoj Kapuganti

[Vladimir Sitnikov]

Manoj,

Try to reproduce 134.

When you manage to do that, you'll see there is no bug in JMeter.

​

Vladimir

[Manoj Kapuganti]

Sorry Vladimir,

I really didn't understand what you said

Please spend couple of minutes to make me understand 'TOTAL' of 90%Line how you computed from above aggregate report took from JMeter site

[Vladimir Sitnikov]

Manoj,

I'm sorry I have no idea how to explain more.
Here's the java code:
https://github.com/apache/jmeter/blob/d81bcc77ba8db075fcd2a173a487424ade518f1b/src/components/org/apache/jmeter/visualizers/StatVisualizer.java#L139

PS. If you claim a bug, you need to supply an "expected output" and justify it.

Vladimir

[cha...@labs.epiuse.com]

Hi,

Did you manage to find the way the total was calculated?

Regards,

Channel

[veerend...@gmail.com]

Hello Manoj,

Let me know, How to compute 90% line?

Any formula... ?

[tome...@gmail.com]

Hi Manoy

according to http://jmeter.apache.org/usermanual/component_reference.html#Aggregate_Report :

90% Line - 90% of the samples took no more than this time.
The remaining samples took at least as long as this. (90^th percentile)

It's mean Aggregate Report compute 90 percentil for each "sampler name" however TOTAL row contains 90 percentil computing for all request.

For example:

Load Times of:

HTTP_Request_1 (1,2,3,4,5,6,7,8,9,10) ms

HTTP_Request_2 (10,20,30,40,50,60,70,80,90,100) ms

90 percentil of HTTP_Request_1 = 9ms

90 percentil of HTTP_Request_2 = 90ms

90 percentil of TOTAL = 80ms

Best Regrads

Tomek