[slurm-users] need to use unused cores | wherein all compute nodes are ALLOC

[Peter Kjellström]

On Mon, 27 Apr 2020 14:51:01 +0530
Sudeep Narayan Banerjee <snbanerjee at iitgn.ac.in> wrote:

> Dear All,
> 
> I have 360 cpu cores in my cluster; 9 compute nodes with 20core x 2 
> sockets each.
> 
> I have slurm.18.08.7 version and have multifactor (fair share) and 
> backfill enabled.
> 
> I am running jobs with less ntasks_per_node in the script and at some 
> point all my compute nodes are ALLOC (with overall 300 cores). but
> since I have not used all the cores, around around 60 ntasks are
> still unused (distributed all over the 9 nodes).
> 
> Question: how can I still submit another job that gets those unused 
> cores to run? I know the status of all such nodes will be changed in 
> MIX. so, what options has to be tweaked in slurm.conf file.
> 
> Currently the status shows (Resources) as Reason for not getting in
> the scheduler.

Start by looking at the difference between --exclusive and not (shared).

/Peter K