[slurm-users] GrpTRESMins and GrpTRESRaw usage

gerard.gil at cines.fr gerard.gil at cines.fr
Wed Jun 29 17:13:56 UTC 2022 

Hi Miguel, 

>If I understood you correctly your goal was to limit the number of minutes each project can run. By associating each project to a slurm account with a nodecay QoS then you will have achieved your goal. 

Here is what I what to do : 

"All jobs submitted to an account regardless the QOS they use have to be constrained to a number of minutes set by the limit associated with that account (and not to QOS)." 

>Try a project with a very small limit and you will see that it won’t run 

I already tested GrpTRESmins limit and confirms it works as expected. 
Then I saw the decay effect on GrpTRESRaw (what I thought first as the right metric to look at) and try to find out a way to fix it. 

It's really very import for me to trust it, so I need a deterministic test to prove it. 

I'm testing this GrpTRESMins limit with NoDecay set on QOS resetting all RawUsage (Account and QOS) to be sure it works as I expect. 
I print the account GrpTRESRaw (in mn) at the end of my tests job to set a new limits with GrpTRESMins and see how it behaves. 

I'll get inform on the results. I hope it works. 

> You don’t have to add anything. 
>Each QoS will accumulate its respective usage, i.e, the usage of all users on that account. Users can even be on different accounts (projects) and charge the respective project with the parameter --account on sbatch. 

If SLURM does it for to manage limit I would also like to obtain the current RawUsage for an account. 
Do you know how to get it ? 

>The GrpTRESMins is always changed on the QoS with a command like: 
> 
>sacctmgr update qos where qos=... set GrpTRESMin=cpu=…. 

That's right if you want to set a limit to a QOS. 
But I dont know/think the same limit value will also apply to all other QOS, and if I apply the same limit to all QOS. 
Is my account limit the sum of all the QOS limit ? 

Actualy I'm setting the limit to the Account using command: 

sacctmgr modify account myaccount set grptresmins=cpu=60000 qos=... 

With this setting I saw the limit is set to the account and not to the QOS. 
sacctmgr show QOS command shows an empty field for GrpTRESMins on all QOS 

Thanks again form your help. 
I hope I'm close to get the answer to my issue. 

Best, 
Gérard 
[ http://www.cines.fr/ ] 

> De: "Miguel Oliveira" <miguel.oliveira at uc.pt>
> À: "Slurm-users" <slurm-users at lists.schedmd.com>
> Envoyé: Mercredi 29 Juin 2022 01:28:58
> Objet: Re: [slurm-users] GrpTRESMins and GrpTRESRaw usage

> Hi Gérard,

> If I understood you correctly your goal was to limit the number of minutes each
> project can run. By associating each project to a slurm account with a nodecay
> QoS then you will have achieved your goal.
> Try a project with a very small limit and you will see that it won’t run.

> You don’t have to add anything. Each QoS will accumulate its respective usage,
> i.e, the usage of all users on that account. Users can even be on different
> accounts (projects) and charge the respective project with the parameter
> --account on sbatch.
> The GrpTRESMins is always changed on the QoS with a command like:

> sacctmgr update qos where qos=... set GrpTRESMin=cpu=….

> Hope that makes sense!

> Best,

> MAO

>> On 28 Jun 2022, at 18:30, [ mailto:gerard.gil at cines.fr | gerard.gil at cines.fr ]
>> wrote:

>> Hi Miguel,

>> OK, I did'nt know this command.

>> I'm not sure to understand how it works regarding to my goal.
>> I use the following command inspired by the command you gave me and I obtain a
>> UsageRaw for each QOS.

>> scontrol -o show assoc_mgr -accounts=myaccount Users=" "

>> Do I have to sumup all QOS RawUsage to obtain the RawUsage of myaccount with
>> NoDecay ?
>> If I set GrpTRESMins for an Account and not for a QOS, does SLURM handle to
>> sumpup these QOS RawUsage to control if the GrpTRESMins account limit is reach
>> ?

>> Thanks again for your precious help.

>> Gérard
>> [ http://www.cines.fr/ ]

>>> De: "Miguel Oliveira" < [ mailto:miguel.oliveira at uc.pt | miguel.oliveira at uc.pt ]
>>> >
>>> À: "Slurm-users" < [ mailto:slurm-users at lists.schedmd.com |
>>> slurm-users at lists.schedmd.com ] >
>>> Envoyé: Mardi 28 Juin 2022 17:23:18
>>> Objet: Re: [slurm-users] GrpTRESMins and GrpTRESRaw usage

>>> Hi Gérard,

>>> The way you are checking is against the association and as such it ought to be
>>> decreasing in order to be used by fair share appropriately.
>>> The counter used that does not decrease is on the QoS, not the association. You
>>> can check that with:

>>> scontrol -o show assoc_mgr | grep "^QOS='+account+’ ”

>>> That ought to give you two numbers. The first is the limit, or N for not limit,
>>> and the second in parenthesis the usage.

>>> Hope that helps.

>>> Best,

>>> Miguel Afonso Oliveira

>>>> On 28 Jun 2022, at 08:58, [ mailto:gerard.gil at cines.fr | gerard.gil at cines.fr ]
>>>> wrote:

>>>> Hi Miguel,

>>>> I modified my test configuration to evaluate the effect of NoDecay.

>>>> I modified all QOS adding NoDecay Flag.

>>>> toto at login1:~/TEST$ sacctmgr show QOS
>>>> Name Priority GraceTime Preempt PreemptExemptTime PreemptMode Flags UsageThres
>>>> UsageFactor GrpTRES GrpTRESMins GrpTRESRunMin GrpJobs GrpSubmit GrpWall MaxTRES
>>>> MaxTRESPerNode MaxTRESMins MaxWall MaxTRESPU MaxJobsPU MaxSubmitPU MaxTRESPA
>>>> MaxJobsPA MaxSubmitPA MinTRES
>>>> ---------- ---------- ---------- ---------- ------------------- -----------
>>>> ---------------------------------------- ---------- ----------- -------------
>>>> ------------- ------------- ------- --------- ----------- -------------
>>>> -------------- ------------- ----------- ------------- --------- -----------
>>>> ------------- --------- ----------- -------------
>>>> normal 0 00:00:00 cluster NoDecay 1.000000
>>>> interactif 10 00:00:00 cluster NoDecay 1.000000 node=50 node=22 1-00:00:00
>>>> node=50
>>>> petit 4 00:00:00 cluster NoDecay 1.000000 node=1500 node=22 1-00:00:00 node=300
>>>> gros 6 00:00:00 cluster NoDecay 1.000000 node=2106 node=700 1-00:00:00 node=700
>>>> court 8 00:00:00 cluster NoDecay 1.000000 node=1100 node=100 02:00:00 node=300
>>>> long 4 00:00:00 cluster NoDecay 1.000000 node=500 node=200 5-00:00:00 node=200
>>>> special 10 00:00:00 cluster NoDecay 1.000000 node=2106 node=2106 5-00:00:00
>>>> node=2106
>>>> support 10 00:00:00 cluster NoDecay 1.000000 node=2106 node=700 1-00:00:00
>>>> node=2106
>>>> visu 10 00:00:00 cluster NoDecay 1.000000 node=4 node=700 06:00:00 node=4

>>>> I submitted a bunch of jobs to control the NoDecay efficiency and I noticed
>>>> RawUsage as well as GrpTRESRaw cpu is still decreasing.

>>>> toto at login1:~/TEST$ sshare -A dci -u " " -o account,user,GrpTRESRaw%80,
>>>> GrpTRESMins ,RawUsage
>>>> Account User GrpTRESRaw GrpTRESMins RawUsage
>>>> -------------------- ----------
>>>> -----------------------------------------------------
>>>> ------------------------------ -----------
>>>> dci cpu=6932
>>>> ,mem=12998963,energy=0,node=216,billing=6932,fs/disk=0,vmem=0,pages=0 cpu=17150
>>>> 415966
>>>> toto at login1:~/TEST$ sshare -A dci -u " " -o account,user,GrpTRESRaw%80,
>>>> GrpTRESMins , RawUsage
>>>> Account User GrpTRESRaw GrpTRESMins RawUsage
>>>> -------------------- ----------
>>>> -----------------------------------------------------
>>>> ------------------------------ -----------
>>>> dci cpu=6931
>>>> ,mem=12995835,energy=0,node=216,billing=6931,fs/disk=0,vmem=0,pages=0 cpu=17150
>>>> 415866
>>>> toto at login1:~/TEST$ sshare -A dci -u " " -o
>>>> account,user,GrpTRESRaw%80,GrpTRESMins,RawUsage
>>>> Account User GrpTRESRaw GrpTRESMins RawUsage
>>>> -------------------- ----------
>>>> -----------------------------------------------------
>>>> ------------------------------ -----------
>>>> dci cpu=6929
>>>> ,mem=12992708,energy=0,node=216,billing=6929,fs/disk=0,vmem=0,pages=0 cpu=17150
>>>> 415766

>>>> Something I forgot to do ?

>>>> Best,
>>>> Gérard

>>>> Cordialement,
>>>> Gérard Gil

>>>> Département Calcul Intensif
>>>> Centre Informatique National de l'Enseignement Superieur
>>>> 950, rue de Saint Priest
>>>> 34097 Montpellier CEDEX 5
>>>> FRANCE

>>>> tel : (334) 67 14 14 14
>>>> fax : (334) 67 52 37 63
>>>> web : [ http://www.cines.fr/ | http://www.cines.fr ]

>>>>> De: "Gérard Gil" < [ mailto:gerard.gil at cines.fr | gerard.gil at cines.fr ] >
>>>>> À: "Slurm-users" < [ mailto:slurm-users at lists.schedmd.com |
>>>>> slurm-users at lists.schedmd.com ] >
>>>>> Cc: "slurm-users" < [ mailto:slurm-users at schedmd.com | slurm-users at schedmd.com ]
>>>>> >
>>>>> Envoyé: Vendredi 24 Juin 2022 14:52:12
>>>>> Objet: Re: [slurm-users] GrpTRESMins and GrpTRESRaw usage

>>>>> Hi Miguel,

>>>>> Good !!

>>>>> I'll try this options on all existing QOS and see if everything works as
>>>>> expected.
>>>>> I'll inform you on the results.

>>>>> Thanks a lot

>>>>> Best,
>>>>> Gérard

>>>>> ----- Mail original -----

>>>>>> De: "Miguel Oliveira" < [ mailto:miguel.oliveira at uc.pt | miguel.oliveira at uc.pt ]
>>>>>> >
>>>>>> À: "Slurm-users" < [ mailto:slurm-users at lists.schedmd.com |
>>>>>> slurm-users at lists.schedmd.com ] >
>>>>>> Cc: "slurm-users" < [ mailto:slurm-users at schedmd.com | slurm-users at schedmd.com ]
>>>>>> >
>>>>>> Envoyé: Vendredi 24 Juin 2022 14:07:16
>>>>>> Objet: Re: [slurm-users] GrpTRESMins and GrpTRESRaw usage
>>>>>> Hi Gérard,

>>>>>> I believe so. All our accounts correspond to one project and all have an
>>>>>> associated QoS with NoDecay and DenyOnLimit. This is enough to restrict usage
>>>>>> on each individual project.
>>>>>> You only need these flags on the QoS. The association will carry on as usual and
>>>>>> fairshare will not be impacted.

>>>>>> Hope that helps,

>>>>>> Miguel Oliveira

>>>>>>> On 24 Jun 2022, at 12:56, [ mailto:gerard.gil at cines.fr | gerard.gil at cines.fr ]
>>>>>>> wrote:

>>>>>>> Hi Miguel,

>>>>>>>> Why not? You can have multiple QoSs and you have other techniques to change
>>>>>>>> priorities according to your policies.
>>>>>>> Is this answer my question ?

>>>>>>> "If all configured QOS use NoDecay, we can take advantage of the FairShare
>>>>>>> priority with Decay and all jobs GrpTRESRaw with NoDecay ?"

>>>>>>> Thanks

>>>>>>> Best,
>>>>> > > Gérard
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