[GE users] Fair Share Formulas

Chris Dagdigian dag at sonsorol.org
Fri Aug 17 18:07:45 BST 2007


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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