[Swift-devel] Re: replication vs site score

[Ioan Raicu]

What we usually do on the BG/P when using static provisioning, is that 
Swift does not start until the resources have been allocated, and that 
is because Falkon does not start until the resources are allocated. The 
whole process is automated, in terms of Swift waiting for Falkon to 
start, and Falkon waiting to start after resources get allocated. So, at 
Swift startup, in a static provisioned case, Swift could have all the 
information it might need, such as number of processors, number of 
sites, load (i.e. idle, as the resources are dedicated to Swift), etc.

Ioan

Mihael Hategan wrote:
> On Thu, 2009-04-09 at 15:30 +0000, 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.
>>     
>
> Except when using pre-allocated resources, you are still waiting for
> them, but the waiting is not automated.
>
>   
>>> 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.
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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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