Jmeter Threads not executing independently

Question

I am using jmeter 4.0 to simulate android app. the app generate data upload to server.

jmeter script is like.

Thread Group -> 13500 threads rampup : 20min
|->once only controller
|->Simple controller
  |->HTTP Request(get number of uploads)
  |->JSR223 Sampler (parse response,set up loop var)
  |->Loop Controller
       |->JSR223 Sampler (generate data)
       |->HTTP Request (send data)
       |->Take Action Sampler
          |->Constant Timer

When script is executed. At first it execute all the once only controller of all the threads then HTTP request for all the threads. So on.
Jmeter is executing each sampler for all the threads then procedding to the sampler.Threads execution is not independent.
I am printing the logs to the console from JSR223 Sampler.

Any feedback on answer ? If ok it should be accepted and upvoted so that it's helpful to community. Thanks — UBIK LOAD PACK
It looks like not able to process so many threads concurrently. Even though cpu usage is not 100%. works fine with reduced thread count — Hexgear
I am running 6000 threads. I figured that threads are slow at JSR223 Sampler (this is where I am generating .zip file to be uploaded to the server) — Hexgear
Thanks for feedback. So I guess you can accept my answer right ? — UBIK LOAD PACK

UBIK LOAD PACK UBIK LOAD PACK · Accepted Answer · 2018-09-26T13:06:21

No that’s not what is happening. You think it is most probably because you start all threads at same time.

In Jmeter all threads run independently.

Add a slight delay using rampup field so that threads gradually start and you’ll see.

Jmeter Threads not executing independently

1 Answers