Ticket 1992

Dear Slurm devs,

I'd like to submit a request for enhancement, to have multiple fair-share trees in the same cluster. Ideally, we'd like to have one fair-share tree per partition.
I think the idea has already been evoked by Tim Wickberg at SLUG'15. 

The rationale for this is as follows: in our condo model setup, we have multiple partitions:
- a globally-accessible partition ("normal") that any user can submit to,
- multiple private partitions ("pA", "pB"...) where only the group who bought the machines can run (groupA in pA, groupB in pB...),
- an umbrella partition ("owners") that contains all the nodes from the pX partitions, where all the owner groups can submit (but potentially be preempted if the rightful owner submit jobs on his nodes). Regular users can't use it.

For the pX partitions though, we have cases where multiple groups get together to buy nodes, which result in a single partition with multiple tenants. And of course, they each contribute a different amount, and would like to get a share of the partition that reflects those contributions, but only for that partition: their fair-share setting shouldn't affect their submissions to the "normal" partition.

That's why we think it would make sense to have per-partition fair-share trees. So if that's an idea that you think is worth considering, that'd be great!

Thanks,
-- 
Kilian