[Swift-devel] coaster status summary

[Ioan Raicu]

I agree that the BG/P is the only system I can think of right now that 
won't work with the UDP scheme you currently have, assuming that you 
will run the service on a login node that has access to both compute 
nodes and external world (i.e. Swift).  The compute nodes don't support 
Java, so you'd have to have some C/Fortran code, or maybe some scripting 
language (which I don't know what kind of support there is).   If you 
use C or Fortran, MPI becomes a viable alternative.  TCP has always been 
an alternative.  Anyways, if UDP doesn't work on the BG/P, and the BG/P 
is the only scale large enough (today) that warrants a connectionless 
protocol, then I suggest you switch to TCP (which has worked for us well 
on the BG/P, and is general enough to work in most environments) or even 
MPI (but you loose the generality of TCP, but might gain performance).

Ioan

Mihael Hategan wrote:
> On Mon, 2008-04-07 at 12:49 +0000, Ben Clifford wrote:
>   
>> Wary of excessive optimisation of job completion notification speed in 
>> order to get high 'trivial/useless job' numbers, when there also seem to 
>> be problems getting shared filesystem access fast enough for non-useless 
>> jobs. Getting a ridiculously high trivial job throughput is not (in my 
>> eyes) a design goal of this coaster work.
>>     
>
> 200 j/s should be enough for anybody.
>
> Joking aside, the issue was ability to scale to large number of jobs
> rather than speed. But it looks like the issue is only an issue for
> monsters such as the BG/P.
>
>   
>
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>   

-- 
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Ioan Raicu
Ph.D. Candidate
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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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