[slurm-users] gres.conf and select/cons_res plugin

[Yair Yarom]

Hi,

I don't remember the exact details, but we started with cons_res a while
back, and at one of the upgrades we moved to cons_tres which was newer and
supported more options (I don't remember which, but I think gpus were
generally supported with cons_res). I don't think we lost any features when
we switched.

Indeed you need to look at your version's documentation, e.g. cons_tres
doesn't appear in:
https://slurm.schedmd.com/archive/slurm-17.11.0/cons_res.html
but appears in
https://slurm.schedmd.com/cons_res.html

And from the latter:
The Consumable Trackable Resources (*cons_tres*) plugin provides all the
same functionality provided by the Consumable Resources (*cons_res*)
plugin. It also includes additional functionality specifically related to
GPUs.



On Wed, 14 Sept 2022 at 11:45, Ole Holm Nielsen <Ole.H.Nielsen at fysik.dtu.dk>
wrote:

> Please note that the on-line Slurm documentation refers to version 22.05
> (the latest version)!  For your outdated version 17.x you will have to
> find the old documentation.
>
> Of course, upgrading to 22.05 is very strongly recommended!  Please note
> that you must upgrade by no more than 2 major releases at a time!!  See
> some notes in
> https://wiki.fysik.dtu.dk/niflheim/Slurm_installation#upgrading-slurm
>
> /Ole
>
> On 9/13/22 23:04, Patrick Goetz wrote:
> > I think reading the documentation is making me more confused; maybe this
> > has to do with version changes.  My current slurm cluster is using
> version
> > 17.x
> >
> > Looking at the man page for gres.conf
> > (https://slurm.schedmd.com/gres.conf.html)  I see this:
> >
> > NOTE: Slurm support for gres/[mps|shard] requires the use of the
> > select/cons_tres plugin.
> >
> > On my current (inherited) Slurm cluster we have:
> >
> >    SelectType=select/cons_res
> >
> > but users are primarily using GPU resources, so I know Gres is working.
> > Why then is select/cons_tres required?
>
>

-- 

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  \/       | Yair Yarom | System Group (DevOps)
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