I think it is a great way to handle GPU permissions, and I sent your method of 
managing GPU permissions to a GPU & clustering discussion list.

However, I assumed that you were using multiple queue instances per node, and 
each queue logically owns the GPU. Was my assumption correct?

 -Ron




----- Original Message -----
From: William Hay <[email protected]>
To: Rayson Ho <[email protected]>
Cc: "[email protected]" <[email protected]>
Sent: Tuesday, May 22, 2012 2:02 PM
Subject: Re: [gridengine users] cgroups Integration in OGS/GE 2011.11 update 1

On 22 May 2012 18:21, Rayson Ho <[email protected]> wrote:
> Hi William,
>
> Can you give me an example of this use case??

Well currently we have our prolog chgrp the appropriate number of
/dev/nvidia? files to the group associated with the job thereby
controlling  access to GPUs.
I'm currently setting up $TMPDIR as a separate tmpfs file system for
each job and am chgrping that to the job's associated group
in the process.

In general access control for anything  that looks like a file and
under unix it is alleged "everything is a file".


William
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