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

Tue, 24 Sep 2024 03:27:03 -0700

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/>

    *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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