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The fair-share algorithm in SLURM is described at http://slurm.schedmd.com/fair_tree.html.

SCITAS machines have a half-life of one week.

To see the share for your group you can use the "Sshare" command"


$ Sshare 
             Account       User Raw Shares Norm Shares   Raw Usage  Norm Usage Effectv Usage  FairShare   Level FS  
-------------------- ---------- ---------- ----------- ----------- ----------- ------------- ---------- ---------- 
scitas-ge                                1    0.007752        1376    0.000003      0.000005           1468.763590
 scitas-ge               aubort          1    0.043478           0    0.000000      0.000000   0.290000        inf 
 scitas-ge             clemenco          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge                cubuk          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge                culpo          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge             degiorgi          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge               eroche          1    0.043478         344    0.000001      0.250000   0.253333   0.173913
 scitas-ge              nvarini          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge                qubit          1    0.043478         351    0.000001      0.255072   0.250000   0.170455
 scitas-ge             rezzonic          1    0.043478         681    0.000001      0.494928   0.246667   0.087848
 scitas-ge              richart          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge              rmsilva          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge                  sue          1    0.043478           0    0.000000      0.000000   0.290000        inf
 scitas-ge                 topf          1    0.043478           0    0.000000      0.000000   0.290000        inf

 

The "Norm Shares" column on the first line is the proportion of the cluster which is allocated to the account and the shares are in terms of cores. Within a group all users have equal weight and so 1 share each.


The value used to decide the priority of a job is the "Level FS" and this is calculated based on the difference between the "Norm Shares" and "Effectv Usage" values. The higher the Level FS, the higher the priority.

A Level FS of less than 1 represents overconsumption. More than 1 means you are underconsuming.



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