[slurm-users] Creating groups of nodes with exclusive access to a resources within a partition.

Rich Cardwell richc at graphcore.ai
Tue Feb 1 10:42:22 UTC 2022


I am wondering if this possible with slurm, I have an application where I want to create groups of  nodes (group size would be between 1 and n servers) which have exclusive access to a shared resources and then on that group of nodes allow a configurable amount of jobs to run.

For example I could have:

partition: bulk, containing:

group1, max 4 jobs:
  - node1
  - node2
  - node3
  - node4

group 2, max 2 jobs:
   - node5

group 3, max 1 job:
  - node6
  - node7
  - node8
  - node9

Ideally the user could submit a job to a generic queue and I could set a configurable gres/license in the background for them and the jobs get placed in a free group or pend if it requires the exclusive resource.

I've taken a look at:

  1.  Using the job submit lua plugin to look at the groups and if a group has available resources set a gres so the job is correctly placed.
  2.  Licenses, but I can't see how to limit a license to a group of hosts without creating clusters. Can you limit licenses to specific nodes?
  3.  On the scheduler, script building the node configuration and update the node gres and issue a 'scontrol reconfigure'

Option 3 works, but isn't great.

So I would really like the be able to use a plugin to look at the current allocation and set the a gres/license/partition for the user in the background, is it possible for the job_submit lua plugin to access an external resources or the license part of the slurm? As I could use that.

Or am I missing something or doing something very wrong.

Thanks in advance for any assistance its much appreciated.

Rich Cardwell
Snr IT Engineer
richc at graphcore.ai


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