I read that link. If Fair Share is so rational (low users get high scores, and high users get low scores), then why do ajoel's and xtsao's Fair Share scores differ this much? Their Level Fair Share scores make more sense.
> sray ajoel 1 0.050000 42449 > 0.069465 0.137396 0.363913 0.018182 > sray xtsao 1 0.050000 41734 > 0.068296 0.135083 0.370143 0.027273 Which brings me back to my OP: How is Fair Share calculated? ________________________________ From: slurm-users <slurm-users-boun...@lists.schedmd.com> on behalf of Renfro, Michael <ren...@tntech.edu> Sent: Wednesday, December 2, 2020 10:32 AM To: Slurm User Community List <slurm-users@lists.schedmd.com> Subject: Re: [slurm-users] FairShare Yesterday, I posted https://docs.rc.fas.harvard.edu/kb/fairshare/<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdocs.rc.fas.harvard.edu%2Fkb%2Ffairshare%2F&data=04%7C01%7Crenfro%40tntech.edu%7Cc23f89dcb97743ee5eda08d8960679ed%7C66fecaf83dc04d2cb8b8eff0ddea46f0%7C1%7C1%7C637424301864169250%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=%2FnB4ivZeDNrVZiaeupFnAj86oQLOhMu1%2FK6YiuBxTB8%3D&reserved=0> in response to a similar question. If you want the simplest general explanation for FairShare values, it's that they range from 0.0 to 1.0, values above 0.5 indicate that account or user has used less than their share of the resource, and values below 0.5 indicate that that account or user has used more than their share of the resource. Since all your users have the same RawShares value and are entitled to the same share of the resource, you can see that bdehaven has the most RawUsage and the lowest FairShare value, followed by ajoel and xtsao with almost identical RawUsage and FairShare, and finally ahantau with very little usage and the highest FairShare value. We use FairShare here as the dominant factor in priorities for queued jobs: if you're a light user, we bump up your priority over heavier users, and your job starts quicker than those for heavier users, assuming all other job attributes are equal. All these values are relative: in our setup, we'd bump ahantau's pending jobs ahead of the others, and put bdehaven's at the end. But if root needed to run a job outside the sray account, they'd get an enormous bump ahead since the sray account has used far more than its fair share of the resource. From: slurm-users <slurm-users-boun...@lists.schedmd.com> Date: Wednesday, December 2, 2020 at 11:23 AM To: slurm-users@lists.schedmd.com <slurm-users@lists.schedmd.com> Subject: Re: [slurm-users] FairShare External Email Warning This email originated from outside the university. Please use caution when opening attachments, clicking links, or responding to requests. ________________________________ 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-boun...@lists.schedmd.com> on behalf of Micheal Krombopulous <michealkrombopul...@outlook.com> Sent: Wednesday, December 2, 2020 9:32 AM To: slurm-users@lists.schedmd.com <slurm-users@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
