[GE users] Fair Share Formulas

Shannon V. Davidson svdavidson at charter.net
Fri Aug 17 18:19:22 BST 2007


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Chris,

Here it is...  I'm assuming the mailing list won't accept attachments so 
I'm sending it directly to you.

Shannon

Chris Dagdigian wrote:
>
> The FTP link seems to be down or timing out on me after several 
> attempts. Can someone shoot me a copy of the PDF?
>
> Regards,
> Chris
>
>
> On Aug 17, 2007, at 12:18 PM, Shannon V. Davidson wrote:
>
>> Here's some good background on the fair share algorithm.
>>
>> ftp://ftp.cs.usyd.edu.au/piers/share.pdf
>>
>> Shannon
>>
>>
>> Daniel Templeton wrote:
>>> Hermann,
>>>
>>> There is no formula for calculating the tickets.  It's an iterative 
>>> algorithm that is highly dependent on situation and configuration.  
>>> Unfortunately, we don't have any clear documentation of the 
>>> algorithm.  If you don't mind reading source code, it's all 
>>> contained in the gridengine/source/libs/sched/sgeee.c file.
>>>
>>> There are some specific situations when the algorithm reduces to a 
>>> formula.  For more information about those situations, check out the 
>>> policy section of the class I delivered at Georgetown:
>>>
>>> https://www.middleware.georgetown.edu/confluence/display/HPCT/Advanced+Sun+Grid+Engine+Configuration+and+Administration 
>>>
>>>
>>> A wise, old Grid Engine engineer once told me that the policy system 
>>> in Grid Engine isn't meant to be calculable on paper.  It's more of 
>>> a steering wheel than an exact setting.  You can adjust the behavior 
>>> by tweaking the values, but don't expect to be able to get 
>>> predictable numbers.
>>>
>>> Daniel
>>>
>>> Erik Soyez wrote:
>>>> This could be helpful:
>>>>
>>>> ------------------------------------------------------------------------ 
>>>>
>>>> http://www.sun.com/blueprints/1005/819-4325.pdf
>>>> http://gridengine.sunsource.net/nonav/source/browse/~checkout~/gridengine/doc/htmlman/manuals.html?content-type=text/html 
>>>>
>>>>   -> sched_conf
>>>>   -> sge_priority
>>>> ------------------------------------------------------------------------ 
>>>>
>>>>
>>>> Erik Soyez.
>>>>
>>>>
>>>> On Fri, 17 Aug 2007, Hessling wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> currently I am investigating "pure" fair share,
>>>>> i.e. the other scheduling options (functional,
>>>>> override) are switched off.
>>>>>
>>>>> I am investigating the influnce of different share
>>>>> values for the project nodes and the user (sub)nodes
>>>>> of the share tree, and the dependence on the fair share
>>>>> parameters "halftime" and "compensating factor".
>>>>>
>>>>> In the manuals I found some brief description
>>>>> but no formulas. Explicit formulas would certainly
>>>>> be of help to obtain at a better understanding
>>>>> of SGE's fair share. Are they published somewhere?
>>>>>
>>>>> Thanks for any hints,
>>>>> Hermann
>>>>>
>>>>> PS: I am running SGE 6.1.
>>>>
>>>> -- 
>>>
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>>>
>>>
>>
>> --____________________________________________
>>
>> Shannon V. Davidson <svdavidson at charter.net>
>> Senior Software Engineer               Appro
>> 636-633-0380 (office)     443-383-0331 (fax)
>> ____________________________________________
>>
>>
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>> To unsubscribe, e-mail: users-unsubscribe at gridengine.sunsource.net
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>
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>

-- 
____________________________________________

Shannon V. Davidson <svdavidson at charter.net>
Senior Software Engineer               Appro
636-633-0380 (office)     443-383-0331 (fax)
____________________________________________




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