[NodeResourceTopology] Is the scheduler aware of the load at the NUMA node level ?

[annis-souames]

Hello,

First of all, thanks to the maintainers of the NRT plugin, it solves many issues and I am considering using it for mainly providing NUMA awareness to the scheduler. I was wondering if the NRT plugin, the scheduler is also aware of the load at the NUMA node level?

For example, if a worker Node A has two NUMA Nodes and one has a load of 80% CPU and 70% RAM, while the second NUMA node has less load, is it possible to make the scheduler aware of these resource loads at the NUMA node level, not at the global node level as it does by default (without NRT)?

Additionally, is it possible to use Priority classes with this plugin? If I have a pod that has to be scheduled on a given NUMA Node even if other pods have to be preempted or evicted.

I would appreciate any help regarding these two questions :)

Thank you

[ffromani]

Hi!

I was wondering if through the NRT plugin, the scheduler is also aware of the load at the NUMA node level?
For example, if a worker Node A has two NUMA Nodes and one has a load of 80% CPU and 70% RAM, while the second NUMA node has less load, is it possible to make the scheduler aware of these resource loads at the NUMA node level, not at the global node level as it does by default (without NRT)?

We do support NUMA-aware node scoring and allocation policies: https://github.com/kubernetes-sigs/scheduler-plugins/blob/master/pkg/noderesourcetopology/README.md#scoringstrategy

does this answer the question or do you need something different?

Additionally, is it possible to use Priority classes with this plugin? If I have a pod that has to be scheduled on a given NUMA Node even if other pods have to be preempted or evicted.

The plugin is designed to be additive with other plugins, in the sense that should fit in any scheduler profile.
The NUMA-aware eviction was initially planned but never implemented, and there are flows we don't test, but in general the plugin should work with any existing kubernetes core (not 3rd party!) plugin

I would appreciate any help regarding these two questions :)

Thanks! I hope I answered !