[slurm-users] Priority access for a group of users

[Henkel, Andreas]

Hi David,

I think there is another option if you don’t want to use preemption. If the max runlimit is small (several hours for example) working without preemption may be acceptable.
Assign a qos with a priority boost to the owners of the node. Then whenever they submit jobs to the partition they get to the top off the queue.
This works only if there is one dedicated partition for those nodes but accessible for all users of course.

Best,
Andreas

Am 15.02.2019 um 18:08 schrieb david baker <djbaker12 at gmail.com<mailto:djbaker12 at gmail.com>>:

Hi Paul, Marcus,

Thank you for your replies. Using partition priority all makes sense. I was thinking of doing something similar with a set of nodes purchased by another group. That is, having a private high priority partition and a lower priority "scavenger" partition for the public. In this case scavenger jobs will get killed when preempted.

In the present case , I did wonder if it would be possible to do something with just a single partition -- hence my question.Your replies have convinced me that two partitions will work -- with preemption leading to re-queued jobs.

Best regards,
David

On Fri, Feb 15, 2019 at 3:09 PM Paul Edmon <pedmon at cfa.harvard.edu<mailto:pedmon at cfa.harvard.edu>> wrote:

Yup, PriorityTier is what we use to do exactly that here.  That said unless you turn on preemption jobs may still pend if there is no space.  We run with REQUEUE on which has worked well.


-Paul Edmon-


On 2/15/19 7:19 AM, Marcus Wagner wrote:
Hi David,

as far as I know, you can use the PriorityTier (partition parameter) to achieve this. According to the manpages (if I remember right) jobs from higher priority tier partitions have precedence over jobs from lower priority tier partitions, without taking the normal fairshare priority into consideration.

Best
Marcus

On 2/15/19 10:07 AM, David Baker wrote:

Hello.


We have a small set of compute nodes owned by a group. The group has agreed that the rest of the HPC community can use these nodes providing that they (the owners) can always have priority access to the nodes. The four nodes are well provisioned (1 TByte memory each plus 2 GRID K2 graphics cards) and so there is no need to worry about preemption. In fact I'm happy for the nodes to be used as well as possible by all users. It's just that jobs from the owners must take priority if resources are scarce.


What is the best way to achieve the above in slurm? I'm planning to place the nodes in their own partition. The node owners will have priority access to the nodes in that partition, but will have no advantage when submitting jobs to the public resources. Does anyone please have any ideas how to deal with this?


Best regards,

David



--
Marcus Wagner, Dipl.-Inf.

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