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

[Uwe Sauter]

You probably shouldn't use "CPUs=24" and "Sockets=2 CoresPerSocket=6 ThreadsPerCore=2" at the same time.
CPUs=24 (or more exactly Tasks=24, though this setting does not exist) follows directly from the other settings.


 From slurm.conf man page:

CPUs
     Number of logical processors on the node (e.g. "2"). CPUs and Boards are mutually exclusive. It can be set to the 
total number of sockets, cores or threads. This can be useful when you want to schedule only the cores on a 
hyper-threaded node. If CPUs is omitted, it will be set equal to the product of Sockets, CoresPerSocket, and 
ThreadsPerCore. The default value is 1.


Am 27.03.19 um 21:00 schrieb Anne M. Hammond:
> 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
> 
> 
> 
> 
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