[slurm-users] Not able to allocate all 24 ntasks-per-node; slurm.conf appears correct

[Renfro, Michael]

Can a second user allocate anything on node fl01 after the first user requests their 12 tasks per node? If not, then it looks like tasks are being tied to physical cores, and not a hyperthreaded version of a core.

-- 
Mike Renfro, PhD / HPC Systems Administrator, Information Technology Services
931 372-3601     / Tennessee Tech University

> On Mar 27, 2019, at 3:00 PM, Anne M. Hammond <hammond at txcorp.com> wrote:
> 
> We are just getting started with slurm here.  We have
> 
> slurm 18.08.6-2
> 
> /etc/slurm/slurm.conf:
> 
> NodeName=fl[01-04] CPUs=24 RealMemory=40000 Sockets=2 CoresPerSocket=6 ThreadsPerCore=2 State=UNKNOWN
> 
> 
> Cannot allocate ntasks-per-node:
> 
> [hammond at hydrogen VSim-9.0]$ srun -N 1 --ntasks-per-node=24 --pty bash
> srun: error: CPU count per node can not be satisfied
> srun: error: Unable to allocate resources: Requested node configuration is not available
> srun: Force Terminated job 46
> 
> Can allocate 12 ntasks-per-node:
> [hammond at hydrogen VSim-9.0]$ srun -N 1 --ntasks-per-node=12 --pty bash
> [hammond at fl01 tmp]$
> 
> Thank you for any pointers.
> 
> Anne