Spark application takes same time for execution having different different cores used each time

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I am trying to run a spark application on spark standalone cluster having total 3 nodes.

there are 3 workers on the cluster and having ram in one node there is 4 GB and rest having 8 GB Ram.

i am executing the same application having different cores like 2,3,4,5 but still the execution time is same to execute the application

i am passing the application to the cluster using sparkclr-submit

can anyone tell me why this can be happening?

here is the image of sparkUI

Thanks.

enter image description here

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