[slurm-users] Reset Fair-share tree account values

Paul Edmon pedmon at cfa.harvard.edu
Thu Jul 16 12:49:52 UTC 2020

Also as a side, is there an official name for the other fairshare 
system?  I guess the official documentation calls it Classic Fairshare, 
like Classic Coke :). I hate to call it old as we use it here and will 
continue to use it. We have no intention to moving to FairTree because 
we've only recently gotten our users used to the current system.  
FairTree frankly doesn't fit our model and is too complicated to explain 
for most of our users who have just figured out how the current system 
works.  So while FairTree is the default the other system is still in 
wide use and I think still very useful.

-Paul Edmon-

On 7/16/2020 8:42 AM, Paul Edmon wrote:
> A trick you can use to reset certain users (which I have used before) 
> is to simply delete them from the slurmdb and then readd them.  At 
> least under the other fairshare system, which is what our site uses, 
> that would remove their usage and they would have 0 usage when they 
> returned.  I'm assuming fairtree works the same way.
> -Paul Edmon-
> On 7/16/2020 5:49 AM, Gestió Servidors wrote:
>> Hello,
>> I will try to explain an scenario that occurs in my SLURM cluster. An 
>> important number of users (accounts) belongs to students of a certain 
>> subject. That subject is 6 month duration. When subject end, I 
>> “reset” user folders, clean all data, reset passwords and, in next 
>> academic year, I offer same users (accounts) to new students, so they 
>> have their $HOME cleans and no old data. However, in SLURM, what old 
>> users could execute modified values we can seen in “sshare -l -a”, 
>> specifically “RawUsage, NormUsage, EffectvUsage, FairShare, LevelFS”. 
>> After reading some documents, I “understand” that these values are 
>> calculated to give more or less priority to a user (account) job 
>> depending its features, cluster use, total number of CPUs, cores, 
>> etc... so, when new users take that accounts, that values should be 
>> reset as a new user in the cluster... but I think that new users are 
>> dragging from the past.
>> My slurm.conf contains these parameters:
>> PriorityType=priority/multifactor
>> PriorityDecayHalfLife=7-0
>> PriorityCalcPeriod=5
>> PriorityUsageResetPeriod=QUARTERLY
>> PriorityFavorSmall=NO
>> PriorityMaxAge=7-0
>> PriorityWeightAge=10000
>> PriorityWeightFairshare=1000000
>> PriorityWeightJobSize=1000
>> PriorityWeightPartition=1000
>> PriorityWeightQOS=0
>> As you can see, “PriorityUsageResetPeriod” is configured as 
>> QUARTERLY, so after reading some documents and examples, I “think” 
>> that fair-share tree, priorities and user assigned job priority is 
>> “reset” and turned to initial values... Am I wrong or am I in the 
>> correct way?
>> But, either way, I would like to reset that values only for some 
>> users (accounts), not for all SLURM users/accounts. Is it possible?
>> Thanks.
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