[slurm-users] Using "Nodes" on script - file ????

[Renfro, Michael]

Hey, Matthias. I’m having to translate a bit, so if I get a meaning wrong, please correct me.

You should be able to set the minimum and maximum number of nodes used for jobs on a per-partition basis, or to set a default for all partitions. My most commonly used partition has:

  PartitionName=batch MinNodes=1 MaxNodes=40 …

and each job runs on one node by default, without anyone having to specify a node count.

If your users are running purely OpenMP jobs, with no MPI at all, there’s no reason for them to request more than one node per job, as you probably already know, and you could potentially set MaxNodes=1 for one or more partitions. If they’re using MPI, they’ll typically need the ability to use more than one node.

You could also use maximum job times, QoS settings, or trackable resource (TRES) limits on a per-user, per-account, or per-partition basis to keep users from consuming all your resources for an extended period of time.

-- 
Mike Renfro, PhD / HPC Systems Administrator, Information Technology Services
931 372-3601     / Tennessee Tech University

> On Feb 12, 2020, at 6:27 AM, Matthias Krawutschke <krawutschke at uni-potsdam.de> wrote:
> 
> Hello together,
> I have a special question regarding the variables:
>  
> #SBATCH -nodes = 2     or SRUN -N….
>  
> Some users of the HPC set these WORTH very high and allocate the ComputeNode, although with that they do not require this at all.
>  
> My question is the following now:
> Is it really necessary that this value must be put in the script, command-line or this can be left out?
> In which case is it necessary to limit these? at OpenMPI possible?
>  
> Best regards….
>  
>  
>  
> Matthias Krawutschke, Dipl. Inf.
>  
> Universität Potsdam
> ZIM - Zentrum für Informationstechnologie und Medienmanagement
> Team High-Performance-Computing on Cluster - Environment
>  
> Campus Am Neuen Palais: Am Neuen Palais 10 | 14469 Potsdam
> Tel: +49 331 977-4444, Fax: +49 331 977-1750
>  
> Internet: https://www.uni-potsdam.de/de/zim/angebote-loesungen/hpc.html