[Swift-devel] Re: replication vs site score

[Ian Foster]

I didn't appreciate that about Coaster. It should (IMHO) support  
static allocation, as a special case. People will clearly want that.


On Apr 9, 2009, at 11:49 AM, Ioan Raicu wrote:

> 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.
>>
>>
>
> -- 
> ===================================================
> Ioan Raicu, Ph.D.
> ===================================================
> Distributed Systems Laboratory
> Computer Science Department
> University of Chicago
> 1100 E. 58th Street, Ryerson Hall
> Chicago, IL 60637
> ===================================================
> 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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