Reading through the Resouce Management section of the docs it states (emphasis mine) that The scheduler ensures that, for each resource type, the sum of the resource requests of the scheduled containers is less than the capacity of the node So, what happens in the following scenario? I have a n…

Can a third pod be scheduled on this node? Yes, but it may not be able to get 8GB of memory until one of the other pods gives it up. What would the effect be of setting limits of 12gb per pod? As soon as they hit 12GB usage, further allocations would cause the OS to try to reclaim memory fr…

Thanks for that. Following on from Q1 then, is there a built-in way of preventing that third pod from being scheduled at that point? We have quite a varied workload which we’re looking at processing using Jobs in Kubernetes with Keda. Some of the tasks will only take 1gb memory, some may take 14. T…

is there a built-in way of preventing that third pod from being scheduled at that point? Not really. You overcommitted the machine. For CPU it would not be a problem, because CPU is a “time-based” rather than “space-based” (aka compressible / incompressible). The more deterministic pattern mig…

Interesting. I’ll keep my eye on that API. We’re a few months off being able to migrate to this I reckon so waiting for that API to GA might be our best bet. I think a very rudimentary fallback would be to have a custom pod running on the node that looks at available memory of the node and adds/rem…

Is available memory taken into consideration when scheduling pods?

General Discussions

MatthewSt May 17, 2024, 11:07pm 6

Just found this post that is asking the same question. Not sure why I missed it when searching earlier

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Is available memory taken into consideration when scheduling pods?

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