[Swift-devel] Re: replication vs site score

[Ioan Raicu]

Mihael Hategan wrote:
>
> You're right. I was trying to say that fundamentally the problem of
> uncertainty in queue times will remain by virtue of the fact that the
> times when people submit jobs (as well as the amount of jobs) is
> unpredictable and it can affect other people's job queue times. 
>
> The predictor in the paper answers the question "if you were to submit
> your job before the state of the queue changes in any way, what would be
> the expected queue time for the job" and not "what will be the queue
> time for the job".
>
>   
Yes, its possible that between a query of prediction, and actual 
submission, the state of the queues change, and therefore the actual 
result change. But, every prediction comes with some error bounds, so 
its possible that the change in queue state, might be reflected in the 
error bars. Nevertheless, I think it might be an interesting improvement 
to the current Swift scheduler. Ben, was this on the list of Google 
summer of code projects? If not, perhaps you might want to add it.

Ioan

-- 
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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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