feature request: socket topology

[vsoch]

hiya! I'm looking to get a mapping of which cores belong to which socket, akin to what hwloc does: https://www.open-mpi.org/projects/hwloc/doc/v0.9.3/

Right now it looks like nfd exposes a cpu -> topology.socket_count which is great, but doesn't tell us about the topology. Would this be possible? Thanks!

[vsoch]

I'm also not seeing basics about number of physical vs logical cores - that seems obvious like it should be here?

[marquiz]

The node labels are not suitable for describing detailed hardware topology. I also think that the NodeFeature CRD isn't a very good at that. There's a separate nfd-topology-updater daemon that would be a better target for this feature – it exposes the topology via a separate CRD called NodeResourceTopology. The topology-updater currently exposes NUMA nodes only, not other aspects of the HW topology.

What is your use case for this request? How are you planning to consume the information?

[vsoch]

I’m working on the compatibility specification for OCI and building extractor plugins and tools, for Kubernetes but also HPC. For a lot of HPC applications we want to know the detailed topology to best schedule work. https://www-hpc.cea.fr/tgcc-public/en/html/toc/fulldoc/Process_distribution_affinity_binding.html

[vsoch]

It could be that hwloc is a better fit for this - I found a library in go but it has a bug so I opened an issue.

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