[Swift-devel] coaster status summary

[Mihael Hategan]

Do you tweak the TCP window size or do you use the default?

On Mon, 2008-04-07 at 13:18 -0500, Ioan Raicu wrote:
> 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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> > Swift-devel at ci.uchicago.edu
> > http://mail.ci.uchicago.edu/mailman/listinfo/swift-devel
> > 
> >   
> 
> -- 
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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
> ===================================================
> Email: iraicu at cs.uchicago.edu
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