[slurm-users] Disabling SWAP space will it effect SLURM working

[Hans van Schoot]

Hi Joseph,

This might depend on the rest of your configuration, but in general swap 
should not be needed for anything on Linux.
BUT: you might get OOM killer messages in your system logs, and SLURM 
might fall victim to the OOM killer (OOM = Out Of Memory) if you run 
applications on the compute node that eat up all your RAM.
Swap does not prevent against this, but makes it less likely to happen. 
I've seen OOM kill slurm daemon processes on compute nodes with swap, 
usually slurm recovers just fine after the application that ate up all 
the RAM ends up getting killed by the OOM killer. My compute nodes are 
not configured to monitor memory usage of jobs. If you have memory 
configured as a managed resource in your SLURM setup, and you leave a 
bit of headroom for the OS itself (e.g. only hand our a maximum of 250GB 
RAM to jobs on your 256GB RAM nodes), you should be fine.

cheers,
Hans


ps. I'm just a happy slurm user/admin, not an expert, so I might be 
wrong about everything :-)



On 06-12-2023 05:57, John Joseph wrote:
> Dear All,
> Good morning
> We have 4 node   [256 GB Ram in each node]  SLURM instance  with which 
> we installed and it is working fine.
> We have 2 GB of SWAP space on each node,  for some purpose  to make 
> the system in full use want to disable the SWAP memory,
>
> Like to know if I am disabling the SWAP  partition will it efffect 
> SLURM  functionality .
>
> Advice requested
> Thanks
> Joseph John
>
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