[Swift-devel] Re: replication vs site score

[Mihael Hategan]

On Wed, 2009-04-08 at 13:58 -0700, Ioan Raicu wrote:
> 
> 
> 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.

I don't know... The system predicted that a 2 minute job on Abe would
sit 11.2 hours in the queue and 2.4 hours on QueenBee, but I've ran 20
such jobs on both in the past 15 minutes.