[Swift-devel] Re: replication vs site score

[Mihael Hategan]

On Thu, 2009-04-09 at 11:51 -0500, Ian Foster wrote:
> I didn't appreciate that about Coaster. It should (IMHO) support
> static allocation, as a special case. People will clearly want that.

Yes. People clearly make irrational choices.

> 
> 
> 
> 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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