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

[Ryan Novosielski]

Primary one I’m aware of is that resource use is better reported (or at all in some cases) via srun, and srun can take care of MPI for an MPI job.  I’m sure there are others as well (I guess avoiding another place where you have to describe the resources to be used and making sure they match, in the case of mpirun, etc.).

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On Sep 30, 2020, at 09:38, Luecht, Jeff A <jeff.luecht at pnc.com> wrote:

First off, I want to thank everyone for their input and suggestions.  They were very helpful an ultimately pointed me in the right direction.  I spent several hours playing around with various settings.

Some additional background. When the srun command is used to execute this job,  we do not see this issue.  We only see it in SBATCH.

What I ultimate did was the following:

1 - Change the NodeName to add the specific parameters Sockets, Cores and Threads.
2 - Changed the DefMemPerCPU/MaxMemCPU to 16144/12228 instead of 6000/12000 respectively

I tested jobs after the above changes and used 'scontrol --defaults job <ID>' command.  The CPU allocation now works as expected.

I do have one question though - what is the benefit/recommendation of using srun to execute a process within SBATCH.  We are running primarily python jobs, but need to also support R jobs.

-----Original Message-----
From: slurm-users [mailto:slurm-users-bounces at lists.schedmd.com] On Behalf Of Diego Zuccato
Sent: Wednesday, September 30, 2020 2:18 AM
To: Slurm User Community List <slurm-users at lists.schedmd.com>; Michael Di Domenico <mdidomenico4 at gmail.com>
Subject: EXTERNAL: Re: [slurm-users] Memory per CPU

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Il 29/09/20 16:19, Michael Di Domenico ha scritto:

what leads you to believe that you're getting 2 CPU's instead of 1?
I think I saw that too, once, but thought it was related to hyperthreading.

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Diego Zuccato
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