<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><font class="Apple-style-span" face="Times">I didn't appreciate that about Coaster. It should (IMHO) support static allocation, as a special case. People will clearly want that.</font></div><div><br></div><br><div><div>On Apr 9, 2009, at 11:49 AM, Ioan Raicu wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <div bgcolor="#ffffff" text="#000000"> 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.<br> <br> Ioan<br> <br> Ben Clifford wrote: <blockquote cite="mid:Pine.LNX.4.64.0904091528130.25355@dildano.hawaga.org.uk" type="cite"> <pre wrap="">On Thu, 9 Apr 2009, Ian Foster wrote:
</pre> <blockquote type="cite"> <pre wrap="">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.
</pre> </blockquote> <pre wrap=""><!---->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.
</pre> <blockquote type="cite"> <pre wrap="">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.
</pre> </blockquote> <pre wrap=""><!---->yes.
</pre> </blockquote> <br> <pre class="moz-signature" cols="72">--
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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: <a class="moz-txt-link-abbreviated" href="mailto:iraicu@cs.uchicago.edu">iraicu@cs.uchicago.edu</a>
Web: <a class="moz-txt-link-freetext" href="http://www.cs.uchicago.edu/~iraicu">http://www.cs.uchicago.edu/~iraicu</a>
<a class="moz-txt-link-freetext" href="http://dev.globus.org/wiki/Incubator/Falkon">http://dev.globus.org/wiki/Incubator/Falkon</a>
<a class="moz-txt-link-freetext" href="http://dsl-wiki.cs.uchicago.edu/index.php/Main_Page">http://dsl-wiki.cs.uchicago.edu/index.php/Main_Page</a>
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