[Beowulf] [External] Question about fair share

Prentice Bisbal pbisbal at pppl.gov
Tue Feb 1 17:21:07 UTC 2022


While an HPC -related topic (and some that aren't HPC-related) are fair 
game in this forum, have you considered posting this question in the 
slurm-users mailing list?


While I'm sure there's significant overlap between the two mailng lists, 
might get additional feedback there.

The max time limit on my cluster is 48 hours, and the half-life is 15 days.

I personally thing your halflife should be 2-4x as long as your max. 
time limit to give the scheduler a fair chance of equalling out cluster 
access. If you have a SLA that dictates when fairshare will be evaluated 
(in a monthly report to your beancounters, for example), I think your 
half-life should be the same size or smaller. I have no rigorous 
mathematical basis for that, or any though experiments to justify it. If 
someone else has done that, or know of papers (including vendor 
whitepapers) about it, please share!


On 1/24/22 2:17 PM, Tom Harvill wrote:
> Hello,
> We use a 'fair share' feature of our scheduler (SLURM) and have our 
> decay half-life (the time needed for priority penalty to halve) set to 
> 30 days.  Our maximum job runtime is 7 days.  I'm wondering what 
> others use, please let me know if you can spare a minute.  Thank you!
> Tom
> Tom Harvill
> Holland Computing Center
> University of Nebraska
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