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That is not for Fair Tree, which is what Micheal asked about.<br>
<br>
Ryan<br>
<br>
<div class="moz-cite-prefix">On 12/2/20 10:32 AM, Renfro, Michael
wrote:<br>
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<p class="MsoNormal">Yesterday, I posted <a
href="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"
title="Original URL:
https://docs.rc.fas.harvard.edu/kb/fairshare/
Click to follow link." moz-do-not-send="true">
<span style="color:#0563C1">https://docs.rc.fas.harvard.edu/kb/fairshare/</span></a><span
class="apple-converted-space"><span style="color:black"> </span></span>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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span
style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">slurm-users
<a class="moz-txt-link-rfc2396E" href="mailto:slurm-users-bounces@lists.schedmd.com"><slurm-users-bounces@lists.schedmd.com></a><br>
<b>Date: </b>Wednesday, December 2, 2020 at 11:23 AM<br>
<b>To: </b><a class="moz-txt-link-abbreviated" href="mailto:slurm-users@lists.schedmd.com">slurm-users@lists.schedmd.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:slurm-users@lists.schedmd.com"><slurm-users@lists.schedmd.com></a><br>
<b>Subject: </b>Re: [slurm-users] FairShare<o:p></o:p></span></p>
</div>
<p style="text-align:center;background:white" align="center"><b><span
style="font-size:12.0pt;color:red;background:white">External
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<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">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.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;color:black">I'm hoping someone
can explain it so my little kernel can understand.<o:p></o:p></span></p>
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align="center">
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span
style="color:black"> slurm-users
<a class="moz-txt-link-rfc2396E" href="mailto:slurm-users-bounces@lists.schedmd.com"><slurm-users-bounces@lists.schedmd.com></a> on behalf
of Micheal Krombopulous
<a class="moz-txt-link-rfc2396E" href="mailto:MichealKrombopulous@outlook.com"><MichealKrombopulous@outlook.com></a><br>
<b>Sent:</b> Wednesday, December 2, 2020 9:32 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:slurm-users@lists.schedmd.com">slurm-users@lists.schedmd.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:slurm-users@lists.schedmd.com"><slurm-users@lists.schedmd.com></a><br>
<b>Subject:</b> [slurm-users] FairShare</span> <o:p></o:p></p>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
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<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">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:<br>
<br>
Account User RawShares NormShares RawUsage
NormUsage EffectvUsage LevelFS FairShare<br>
-------------------- ---------- ---------- -----------
----------- ----------- ------------- ----------
----------<br>
root
0.000000 611349 1.000000<br>
root root 1
0.076923 0 0.000000 0.000000
inf 1.000000<br>
sray 1
0.076923 30921 0.505582 0.505582 0.152147<br>
sray phedge 1 0.050000
0 0.000000 0.000000 inf
0.181818<br>
sray raab 1
0.050000 0 0.000000 0.000000
inf 0.181818<br>
sray benequist 1 0.050000
0 0.000000 0.000000 inf
0.181818<br>
sray bosch 1 0.050000
0 0.000000 0.000000 inf
0.181818<br>
sray rjenkins 1 0.050000
0 0.000000 0.000000 inf
0.181818<br>
sray esmith 1 0.050000
0 0.000000 0.000000 1.7226e+07
0.054545<br>
sray gheinz 1 0.050000
0 0.000000 0.000000 1.9074e+14
0.072727<br>
sray jfitz 1
0.050000 0 0.000000 0.000000
8.0640e+20 0.081818<br>
sray ajoel 1
0.050000 42449 0.069465 0.137396
0.363913 0.018182<br>
sray jmay 1 0.050000
0 0.000000 0.000000 inf
0.181818<br>
sray aferrier 1 0.050000
0 0.000000 0.000000 inf
0.181818<br>
sray bdehaven 1 0.050000
225002 0.367771 0.727420 0.068736 0.009091<br>
sray msmythe 1 0.050000
0 0.000000 0.000000 inf 0.181818<br>
sray gfink 1 0.050000
0 0.000000 0.000000 2.0343e+05
0.045455<br>
sray ahantau 1 0.050000
31 0.000051 0.000102 491.737549
0.036364<br>
sray hmiller 1 0.050000
0 0.000000 0.000000 inf
0.181818<br>
sray ttinker 1 0.050000
0 0.000000 0.000000 1.4798e+13
0.063636<br>
sray wcooper 1 0.050000
0 0.000000 0.000000 inf 0.181818<br>
sray xtsao 1 0.050000
41734 0.068296 0.135083 0.370143
0.027273<br>
sray xping 1 0.050000
0 0.000000 0.000000 1.9833e+24
0.090909<br>
<br>
<o:p></o:p></p>
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<br>
<pre class="moz-signature" cols="72">--
Ryan Cox
Director
Office of Research Computing
Brigham Young University
</pre>
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