Thank you so much Felix!

Le mar. 24 sept. 2024 à 23:18, Felix Schumacher <
felix.schumac...@internetallee.de> a écrit :

> I think you found a bug and I opened
> https://github.com/apache/jmeter/issues/6352
>
> The workaround of adding "pause(6 min)" to your setup should help you out
> till we fixed the bug.
>
> So, change "rate(0) random_arrivals..." to "pause(6 min) rate(0)
> random_arrivals..." and you can spend six minutes in your setup thread
> group without getting a sample storm at the start of OMTG after setup has
> finished.
>
> Felix
> Am 24.09.24 um 12:26 schrieb Felix Schumacher:
>
> Could you try to compensate for the thread setup group by adding a pause(6
> min) (or even seven minutes) at the start of your OMTG? I suspect, that the
> start times for the threads are calculated from the beginning of the test
> instead of after the setup groups.
>
> Felix
> Am 24.09.24 um 12:01 schrieb Liliane et Robert Bourgault du Coudray:
>
> Ah, this is because I have a "Setup Thread Group" using the standard
> Thread Group and running for 5 to 6 minutes to do some initial data setup
> on the system.
> And then the OMTG will kick in.
> I have not shown the threads of this Setup Thread Group in the graph, only
> the OMTG sequence.
>
> Le mar. 24 sept. 2024 à 16:37, Felix Schumacher <
> felix.schumac...@internetallee.de> a écrit :
>
>> Why is the spike at 06:23 (seconds? minutes?). Could it be, that
>> something is holding back your threads and releases them all at one?
>>
>> If there is a lot of time at the beginning of the test, where seemingly
>> nothing happens, I would take a few thread dumps on the JMeter side and
>> look at those.
>>
>> Felix
>> Am 19.09.24 um 03:36 schrieb Robert Bourgault du Coudray:
>>
>> Hi,
>> I am seeing a spike of threads on start-up, which I think is abnormal.
>>
>> For instance, I have set an Open Model Thread Group with following
>> parameters:
>>
>>
>>
>> / * Rampup-up time over 1 min */
>>
>> rate(0) random_arrivals(1 min) rate(30/min)
>>
>> /* Test  for 30 mins */
>>
>> random_arrivals(30 min) rate(30/min)
>>
>>
>>
>> With these settings, we are seeing a spike of threads up to 160 on
>> start-up before the system stabilises to a more reasonable rate afterwards
>> (see attachment).
>>
>> This is causing false positives on our SUT.
>>
>>
>>
>> Can you please suggest any workarounds or fixes?
>>
>>
>>
>> Thank you
>>
>>
>>
>> *Robert Bourgault du Coudray*
>> Senior Quality Engineer | Bankwest Technology
>> Level 14C Bankwest Place 300 Murray Street Perth WA 6000
>> (08) 9369 9487   |   0468 770 721
>> robert.bourgaultducoud...@bankwest.com.au
>> bankwest.com.au <http://www.bankwest.com.au/>
>>
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>>
>>
>>
>>
>>
>>
>>
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