[lustre-devel] [PATCH v3 07/26] staging: lustre: libcfs: NUMA support

[NeilBrown]

On Mon, Jun 25 2018, Doug Oucharek wrote:

> Some background on this NUMA change:
>
> First off, this is just a first step to a bigger set of changes which include changes to the Lustre utilities.  This was done as part of the Multi-Rail feature.  One of the systems that feature is meant to support is the SGI UV system (now HPE) which has a massive number of NUMA nodes connected by a NUMA Link.  There are multiple fabric cards spread throughout the system and Multi-Rail needs to know which fabric cards are nearest to the NUMA node we are running on.  To do that, the “distance” between NUMA nodes needs to be configured.
>
> This patch is preparing the infrastructure for the Multi-Rail feature to support configuring NUMA node distances.  Technically, this patch should be landing with the Multi-Rail feature (still to be pushed) for it to make proper sense.
>

Thanks a lot for the background.

If these NUMA nodes have a 'distance' between them, and if lustre can
benefit from knowing the distance, then is seems likely that other code
might also benefit.  In that case it would be best if the distance were
encoded in some global state information so that lustre and any other
subsystem can extract it.

Do you know if there is any work underway by anyone to make this
information generally available?  If there is, we should make sure that
lustre works in a compatible way so that once that work lands, lustre
can use it directly and not need extra configuration.
If no such work is underway, then it would be really good if something
were done in that direction.  If no-one here is able to work on this, I
can ask around in SUSE and see if anyone here knows anything relevant.

Thanks,
NeilBrown
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