Lesson 210 - GOMAXPROCS and K8s CFS scheduler

[agravelot]

If your k8s node has more cpus than your deployment limit, the golang scheduler will not be aware of the kubernetes CFS scheduler, leading to many/all coroutines in a sleep state, false result.
Setting GOMAXPROCS=2 as in k8s deployment can lead to better performance.

https://github.com/uber-go/automaxprocs is specially designed for this purpose.

Related discussion: #288

[agravelot]

I hadn't noticed this PR with better explaination: #278
May still be relevant to the current branch.

[antonputra]

Thank you, @agravelot! I did some more research and even ran tests. You're right—GOMAXPROCS makes a significant difference! I'll be using it in all my future benchmarks.

env:
- name: GOMAXPROCS
  valueFrom:
    resourceFieldRef:
      resource: limits.cpu
resources:
  requests:
    memory: 128Mi
    cpu: 500m
  limits:
    memory: 256Mi
    cpu: 1000m

https://www.youtube.com/watch?v=h2pCxj_Fkdc&t=984s