SLURM

Berkeley Lab Checkpoint/Restart

hpc, SLURM
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Berkeley Lab Checkpoint/Restart has been installed on the SLURM cluster. This allows users to checkpoint a job, cancel it and then resume the job at a later date. The executable is started with the cr_run wrapper: cr_run /home/andy/ram.pl >> /home/andy/ramtest.out…
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SLURM and memory management

hpc, SLURM
SLURM allows a DefMemPerCPU and a MaxMemPerCPU to be set. If a user does not set a memory limit the default will be used. This is normally set to MaxMem/NumCores. As memory is a consumable resource (SelectTypeParameters=CR_Core_Memory) MaxMemPerCPU serves not
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GPUs and GRES

GPU, hardware, hpc, SLURM

Our current cluster, hex, runs Torque with MAUI as the scheduler. While MAUI is GPU aware it does not allow GPUs to be scheduled. In other words you can list the nodes with GPUs but you cannot submit a job …

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SLURM job preemption

hpc, SLURM

SLURM provides a preemption mechanism to deal with situations where cluster become overloaded. This can be configured in several ways:

FIFO:
This is the most simplistic method of queueing in which there is no preemption, jobs come in, queue and …

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New stuff

hardware, hpc, SLURM
SLURM
The HPC team is busy testing a prototype SLURM cluster. This will replace both the hex and hpc clusters, although it is likely that the hex infrastructure will be incorporated into the new cluster. The time frame for
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