[slurm-users] FairShare

[Erik Bryer]

I'm not talking about the Level Fair Share. That's easy to compute. I'm talking about Fair Share -- what sshare prints out on the rightmost side.
________________________________
From: slurm-users <slurm-users-bounces at lists.schedmd.com> on behalf of Ryan Cox <ryan_cox at byu.edu>
Sent: Wednesday, December 2, 2020 10:31 AM
To: Slurm User Community List <slurm-users at lists.schedmd.com>; Micheal Krombopulous <MichealKrombopulous at outlook.com>
Subject: Re: [slurm-users] FairShare

It's really similar to a binary search tree.  Within each account, it is Shares / Usage to calculate the Level FS.  See https://slurm.schedmd.com/SUG14/fair_tree.pdf has more details, starting at page 34 or so.  It even has an "animation".

Ryan

On 12/2/20 10:22 AM, Micheal Krombopulous wrote:
I've read the manual and I re-read the other link. What they boil down to is Fair Share is calculated based on a recondite "rooted plane tree", which I do not have the background in discrete math to understand.

I'm hoping someone can explain it so my little kernel can understand.
________________________________
From: slurm-users <slurm-users-bounces at lists.schedmd.com><mailto:slurm-users-bounces at lists.schedmd.com> on behalf of Micheal Krombopulous <MichealKrombopulous at outlook.com><mailto:MichealKrombopulous at outlook.com>
Sent: Wednesday, December 2, 2020 9:32 AM
To: slurm-users at lists.schedmd.com<mailto:slurm-users at lists.schedmd.com> <slurm-users at lists.schedmd.com><mailto:slurm-users at lists.schedmd.com>
Subject: [slurm-users] FairShare

Can someone tell me how to calculate fairshare (under fairtree)? I can't figure it out. I would have thought it would be the same score for all users in an account. E.g., here is one of my accounts:

Account     User  RawShares  NormShares    RawUsage   NormUsage  EffectvUsage    LevelFS  FairShare
-------------------- ---------- ---------- ----------- ----------- ----------- ------------- ---------- ----------
root                                               0.000000      611349                  1.000000
 root                      root             1    0.076923           0    0.000000      0.000000        inf   1.000000
 sray                                          1    0.076923      30921 0.505582      0.505582   0.152147
  sray                 phedge            1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                raab                  1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                benequist          1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                 bosch               1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                rjenkins             1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                  esmith            1    0.050000           0    0.000000      0.000000 1.7226e+07   0.054545
  sray                  gheinz            1    0.050000           0    0.000000      0.000000 1.9074e+14   0.072727
  sray                  jfitz                 1    0.050000           0    0.000000      0.000000 8.0640e+20   0.081818
  sray                   ajoel              1    0.050000       42449    0.069465      0.137396   0.363913   0.018182
  sray                  jmay               1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                 aferrier            1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                bdehaven         1    0.050000      225002    0.367771      0.727420   0.068736   0.009091
  sray                msmythe          1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                 gfink               1    0.050000           0    0.000000      0.000000 2.0343e+05   0.045455
  sray                ahantau           1    0.050000          31    0.000051      0.000102 491.737549   0.036364
  sray                 hmiller            1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                   ttinker          1    0.050000           0    0.000000      0.000000 1.4798e+13   0.063636
  sray                wcooper          1    0.050000           0    0.000000      0.000000        inf   0.181818
  sray                 xtsao              1    0.050000       41734    0.068296      0.135083   0.370143   0.027273
  sray                   xping            1    0.050000           0    0.000000      0.000000 1.9833e+24   0.090909



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