[slurm-users] exclusive or not exclusive, that is the question

Marcus Wagner wagner at itc.rwth-aachen.de
Tue Aug 20 07:47:17 UTC 2019

Hi Folks,

I think, I've stumbled over a BUG in Slurm regarding the exclusiveness. 
Might also, I've misinterpreted something. I would be happy, if someone 
could explain that to me in the latter case.

To the background. I have set PriorityFlags=MAX_TRES
The TRESBillingWeights are "CPU=1.0,Mem=0.1875G" for a partition with 48 
core nodes and RealMemory 187200.


I have two jobs:

job 1:
#SBATCH --exclusive
#SBATCH --ntasks=2
#SBATCH --nodes=1

scontrol show <jobid> =>
    NumNodes=1 NumCPUs=48 NumTasks=2 CPUs/Task=1 ReqB:S:C:T=0:0:*:*

exactly, what I expected, I got 48 CPUs and therefore the billing is 48.


job 2 (just added mem-per-cpu):
#SBATCH --exclusive
#SBATCH --ntasks=2
#SBATCH --nodes=1
#SBATCH --mem-per-cpu=5000

scontrol show <jobid> =>
    NumNodes=1-1 NumCPUs=2 NumTasks=2 CPUs/Task=1 ReqB:S:C:T=0:0:*:*

Why "destroys" '--mem-per-cpu' exclusivity?


Marcus Wagner, Dipl.-Inf.

IT Center
Abteilung: Systeme und Betrieb
RWTH Aachen University
Seffenter Weg 23
52074 Aachen
Tel: +49 241 80-24383
Fax: +49 241 80-624383
wagner at itc.rwth-aachen.de

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