Don't put all nodes to power save mode

[Maciej Skarysz]

Hi,

I understand that slurmctld is deciding to put idle nodes to power save mode. It runs SuspendProgram. I want to always keep one node idle (not idle~), is it possible? Note that I can't use SuspendExcNodes as I don't know a priori which node will stay idle, I only know I always what to have one.

I would appreciate any suggestions.

Best,

Maciej

[Keith Binder]

If you re-deploy using the field "static_node_count" under a partition, you can specify a certain number of nodes that will stay in the "idle" state.

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[Maciej Skarysz]

Hi Keith,

Many thanks for your answer. The "static_node_count" effectively sets SuspendExcNodes in slurm.conf and this indeed keep nodes in state idle. But this option only works for non-preemptible machines, and is not exactly what I want. I want to have (n+1)th node idle where n is the number of allocated nodes. When I set static_node_count=1 and then I allocate a job to this node my number of idle nodes will be 0. I hope I didn't make it harder to understand.

Best,

Maciej

[Wyatt Gorman]

Hi Maciej,

The static nodes that are created by the YAML field are not preemptible, regardless of the configuration of the burst nodes in the rest of the partition.

Currently there is no way to arbitrarily set a given node in a job as non-preemptible. You would have to split things between a preemptible partition and a non-preemptible one.

Wyatt Gorman HPC Solutions Manager https://cloud.google.com/hpc

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