Thanks for the reply Ryan, Yes, I’m using the basic fairshare. I am trying to use fairshare across a flat listing of users only, with a placeholder parent account called ‘dev’, but for now, it has no siblings. All users are under ‘dev’.
I think the way it is calculated, in my configuration, the largest fairshare I will ever see is 0.5. F = 2**(-Ue/S), where in my case S = 1000 / 16000 (1000 per user, 16 users (who each have 1000)) and I have Ue =S for a user who never submit a job yet because Ue = 0 (Uactual) + (1.0 – 0.0)*1000/16000 (1.0 is parent usage, which is always 1.0 in my case because dev is the only parent account for any user) I was expecting/hoping/wishing the values would be between 0.0 and 1.0, but I can work with 0.5 as the max value. It just means that I need to double the PriorityWeightFairshare factor in order to achieve the intended relative weighting between Fairshare, QOS, Partitions, JobSize, Age. Ed From: Ryan Cox [mailto:[email protected]] Sent: Tuesday, October 14, 2014 6:00 PM To: slurm-dev Subject: EXTERNAL: [slurm-dev] Re: question on multifactor priority plugin - fairshare basics I assume you are using the default fairshare algorithm since you didn't specify otherwise. F=2**(-U/S) where U is Effectv Usage (often displayed in documentation as UE) and S is Norm Shares. See http://slurm.schedmd.com/priority_multifactor.html under the heading "The SLURM Fair-Share Formula". Basically, Effectv Usage needs to be less than Norm Shares for Fairshare to be greater than 0.5. Ryan On 10/14/2014 04:27 PM, Blosch, Edwin L wrote: I must be misunderstanding a basic concept here. What conditions would have to exist to cause a Fairshare value greater than 0.5? [bloscel@maruhpc5 ~]$ sshare -a Account User Raw Shares Norm Shares Raw Usage Effectv Usage FairShare -------------------- ---------- ---------- ----------- ----------- ------------- ---------- root 1.000000 11376527 1.000000 0.500000 root root 0 0.000000 0 0.000000 0.000000 cfd 1 1.000000 11376527 1.000000 0.500000 cfd bendeee 1000 0.076923 0 0.076923 0.500000 cfd bloscel 1000 0.076923 712296 0.134718 0.297027 <more users under same group>
