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</o:shapelayout></xml><![endif]--></head><body lang=DE link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear slurm-users, <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I built a slurm system consisting of two nodes (Ubuntu 20.04.1, slurm 20.02.5):<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> # COMPUTE NODES<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> GresTypes=gpu<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> NodeName=lsm[216-217] Gres=gpu:tesla:1 CPUs=64 RealMemory=192073 Sockets=2 CoresPerSocket=16 ThreadsPerCore=2 State=UNKNOWN<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> PartitionName=admin Nodes=lsm[216-217] Default=YES MaxTime=INFINITE State=UP<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The slurmctl is running on a separate Ubuntu system where no slurmd is installed.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>If a user executes this script (sbatch srun2.bash)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> #!/bin/bash<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> #SBATCH -N 2 -n9<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-10 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-11 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-12 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-13 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-14 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-15 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-16 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> srun pimpleFoam -case /mnt/NFS/users/quast/channel395-17 -parallel > /dev/null &<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> wait<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>8 jobs with 9 threads are launched and distributed on two nodes.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>If more such scripts get started at the same time, all the srun commands will be executed even though no free cores are available. So the nodes are overallocated.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>How can this be prevented?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thx :)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal>Greetings <o:p></o:p></p><p class=MsoNormal>max<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>