[slurm-users] EXTERNAL: Re: Memory per CPU

[Luecht, Jeff A]

There are three pieces of information that may provide Useful:

1 - these are VMs and not physical servers
2 - the OS is RedHat 7.8
2 - As far as I can tell, hyperthreading is not enabled, but will check for sure
3 - when we ask for 15Gb memory - we will only get 1 CPU

-----Original Message-----
From: slurm-users [mailto:slurm-users-bounces at lists.schedmd.com] On Behalf Of Michael Di Domenico
Sent: Tuesday, September 29, 2020 10:20 AM
To: Slurm User Community List <slurm-users at lists.schedmd.com>
Subject: EXTERNAL: Re: [slurm-users] Memory per CPU

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what leads you to believe that you're getting 2 CPU's instead of 1?
'scontrol show job <id>' would be a helpful first start.

On Tue, Sep 29, 2020 at 9:56 AM Luecht, Jeff A <jeff.luecht at pnc.com> wrote:
>
> I am working on my first ever SLURM cluster build for use as a resource manager in a JupyterHub Development environment.  I have configured the cluster for SelectType of ‘select/con_res’ with DefMemPerCPU and MaxMemPerCPU of 16Gb.  The idea is to essentially provide for jobs that run in a 1 CPU/16Gb chunks.  This is a starting point for us.
>
>
>
> What I am seeing is that when users submit jobs and ask for memory only  – in this case, 16Gb, SLURM actually allocates 2 CPUs, not 1 that I would expect.  Is my understanding of how this particular configuration works incorrect?
>
>
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