[Swift-devel] Re: replication vs site score

[Mihael Hategan]

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.
>