Does number of running pods in namespace cause performance issue?

Question

We are facing issue in AKS cluster with java spring boot component.

If we run that pod in one namespace where only 2 pods are running it is competing process data in 30 seconds. If we run same pod in other namespace where 18 pods are running, it takes 55+ seconds to is completing data processing.

This pod is scheduled to be run in separate node where no other pods are running.

Question: Does number of running pods in namespace cause performance issue?

We tried scheduling pod in standalone node where no other applications are running.

Answer 1

when there are multiple components running in single name space and enableServiceLinks is true the code is taking time to process data. once we changed enableServiceLinks to false code is taking similar time as it was taking in namespace with only 2 components.

Answer 2

you're correct in expecting Namespaces to have no effect on container performance. Namespaces are just logical groupings. You're also correct in expecting Node placement to impact performance. What I would do to analyze the behavior you're describing is compare the resource consumption during the 2 executions. In general - CPU throttling on the node can cause slowness. Also disk performance - if the data processing involves disk reads or writes.
Also would check if the 55 seconds include the container initialization time. If running on a totally new node - image pulling can slow down the total execution time. What do you use to analyze container resource consumption and performance issues?