Prove that crun use less memory than runc

Test scenario

1. Kubernetes 1.18.15 cluster with:

• 1 runc master 4 cpu 4GB memory
• 1 runc worker 4 cpu 4GB memory
• 1 crun worker 4 cpu 4GB memory

2. Deploy 300 pods echoserver.

3. Load test to svc ip with simple curl while loop.

Result:

Conclusion:

Available memory from free command, runc use ~ 7% more memory than crun.

That’s all.

Update1:

increase number of pod to 520, result still the same.

Update2:

podman vs docker crun still use ~50% less memory.