[slurm-users] Reserving slots with sbatch and OpenMpi

[Ralph Castain]

I assume you are running the job via mpirun? Can you share the mpirun cmd line?


> On Mar 11, 2022, at 11:31 AM, Mccall, Kurt E. (MSFC-EV41) <kurt.e.mccall at nasa.gov> wrote:
> 
> With sbatch, what is the proper way to launch 5 tasks each on a single node, but reserve two slots on each node so that the original tasks can each create one new process using MPI_Comm_spawn?
>  
> I’ve tried various combinations of the sbatch arguments –nodes, --ntasks-per-node and –cpu-per-node, but all attempts result in this OpenMpi error message:
>  
> “All nodes which are allocated for this job are already filled.”
>  
> I expected the proper arguments to be –nodes=5  --ntasks=5   –cpus-per-task=2.
>  
> The 5 original processes are created correctly, but it seems like MPI_Comm_spawn is causing the error message when it tries to allocate a CPU.
>  
> I’m using slurm 20.11.8 and OpenMpi 4.1.2.
>  
> Thanks,
> Kurt

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