[slurm-dev] How to enforce jobs cpu count to avoid underusing nodes

[Damian Montaldo]

Hello, sorry if this answer is in the man page but we can't find the 
solution

We're working on a cluster that has 64 cores nodes.
Since nodes are not shared but running jobs in exclusive mode, we want 
to require and enforce users to ask for a minimum number of cores. We 
want to avoid underusing node's throughput.
Is there a way to do so?

Since we are running [GrpCPURunMins] based quotas, when a job locks the 
entire node but requires less than the available cores, say n cores 
(n<64), it consumes only n * running time [GrpCPURunMins], and not 64 * 
running time. So jobs keep 64-n cores idle but get "billed" only by n...

Thanks in advance,
Damián.