[slurm-users] Reserving slots with sbatch and OpenMpi
rhc at pmix.org
Fri Mar 11 21:48:08 UTC 2022
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.
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