[Swift-devel] Re: replication vs site score

[Ioan Raicu]

Right, Falkon supports both static and dynamic allocation of resources. 
I believe coaster only supports dynamic allocation of resources. We have 
lots of information under static allocation, that could help scheduling, 
but under dynamic allocation, there is a mixture of known information 
(the already allocated resources) and the unknown (the jobs in the wait 
queue). In a sense, a smarter scheduler could make use of at least known 
information, although this information might frequently change, and the 
scheduler would have to adapt frequently.

Ioan

Ben Clifford wrote:
> On Thu, 9 Apr 2009, Ian Foster wrote:
>
>   
>> I wanted to point out that when we use Falkon/coasters, we have full control
>> over scheduling, so in that case we could in principle pre-compute schedules.
>>     
>
> Coasters as they are now are still allocated on an opportunistic basis, so 
> once we have a coaster stuff could be scheduled to it, but when coaster 
> workers actually exist is as unknown as when jobs will run in the 
> non-coaster case, I think.
>
> Where Falkon has been used for pre-allocated resources on machines, with 
> no dynamic allocation/unallocation, though, the available resources 
> probably are known well enough for this.
>
>   
>> However, in practice we still don't tend to have enough information about
>> execution times for this to be that useful. At least that's my belief.
>>     
>
> yes.
>
>   

-- 
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Ioan Raicu, Ph.D.
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Distributed Systems Laboratory
Computer Science Department
University of Chicago
1100 E. 58th Street, Ryerson Hall
Chicago, IL 60637
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Email: iraicu at cs.uchicago.edu
Web:   http://www.cs.uchicago.edu/~iraicu
http://dev.globus.org/wiki/Incubator/Falkon
http://dsl-wiki.cs.uchicago.edu/index.php/Main_Page
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