RE: [Xen-users] Fwd: Credit-Based CPU Scheduler

["Su, Disheng" <disheng.su@xxxxxxxxx>]

Hi Omer,
        Maybe no mathematical formula for credit scheduler... 
        There are three kinds of priorities: BOOST, UNDER, OVER. Usually, guest 
vcpu is in UNDER if its credit is not used out, or in OVER.
        In http://markmail.org/message/oiqibkmkak75zv5z, you'll find the 
details about how to calculate the credit.
        And http://www.xen.org/files/xensummit_tokyo/15_NaokiNishiguchi-en.pdf, 
gives you the insight how credit scheduler works. 
        
Omer Khalid wrote:
> Hi,
> 
> I am researching on optimization of virtual machines running
> high-performance computing applications. I looked up on Xen
> Credit-Based CPU Scheduler twiki page but could not find the
> mathematical formula for calculating the priorities:
> 
> http://wiki.xensource.com/xenwiki/CreditScheduler
> 
> I guess there would be one, probably not published on the web, so it
> would be great if some knows about it.
> Thanks,
> Omer
> 
> -------------------------------------------------------
> CERN -- European Organization for Nuclear
> Research, IT Department, CH-1211,
> Geneva 23, Switzerland
> 
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Best Regards,
Disheng, Su
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