Re: [OpenModelThreadGroup]Spike of threads on start-up

Felix Schumacher <[email protected]> Tue, 24 Sep 2024 10:37:29 +0200
Newsgroups	gmane.comp.jakarta.jmeter.user
Message-ID	<[email protected]>
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
> [email protected]
> bankwest.com.au <http://www.bankwest.com.au/>
>
> *Bankwest acknowledges the Traditional Owners of the lands across 
> Australia as the continuing custodians of Country and Culture. We pay 
> our respect to First Nations peoples and their Elders, past and present. *
>
>
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