[slurm-users] Sharing a GPU

[Kamil Wilczek]

Hello!

I am an administrator of a GPU cluster (Slurm version 19.05.5).

Could someone help me a little bit and explain if a single
GPU can be shared between multiple users? My experience and
documentation tells me that it is not possible. But even after
some time Slurm is still a beast to me and I find myself
struggling :)

* I setup the cluster to assign GPUs on multi-GPU servers
   to different users using GRES. This works fine and several
   users can work on a multi-GPU machine (--gres=gpu:N/--gpu:N).

* But sometimes I have requests to allow a group of students
   to work simultaneously, interactively on a small partition,
   where there is more users than GPUs. So I thought that maybe
   an MPS is a solutions, but the docs says that MPS is a way
   to run multiple jobs of *the same* user on a single GPU.
   When another user is requesting a GPU by MPS, the job is enqueued
   and waiting for the first users' MPS server to finish.
   So, this is not a solution for a multi-user, simultaneous/parallel
   environment, right?

Is there a way to share a GPU between multiple users?
The requirement is, say:

* 16 users working interactively, simultaneously
* 4 GPUs partition

Kind Regards
-- 
Kamil Wilczek  [https://keys.openpgp.org/]
[D415917E84B8DA5A60E853B6E676ED061316B69B]
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