[gmx-users] cluster types supported

[Mike Grommet]

Thanks Erik,  I'm pretty much a newbie when it comes to clustering, and
gromacs for that matter..

I appreciate the explanation on the openMosix issue, that really does clear
things up on that front.

And its early, I haven't had my liquid no-doze yet this morning, I'm not
sure if your statement lends weight (or not)
to the openssi cluster question...

Just for reference:   http://www.openssi.org/

Thanks for the response...


M.


----- Original Message -----
From: "Erik Lindahl" <lindahl at stanford.edu>
To: <gmx-users at gromacs.org>
Sent: Monday, August 18, 2003 3:06 AM
Subject: Re: [gmx-users] cluster types supported


> Hi Mike,
>
> Single-cpu Gromacs runs work great on any system. As for openmosix,
> there is nothing we can do to support it - it is they who don't support
> MPI :-)
>
> However, since parallel molecular dynamics involve a lot of
> communication and is quite sensitive to load balancing you would get
> really bad performance on an openmosix-style cluster. OpenMosix relies
> on moving processes around, and that would be very bad idea when we
> need to communicate with the other processors 10-100 times per second -
> you would always have one CPU falling behind, and then everybody else
> has to wait for that one. In theory I guess it would work well on an
> unloaded cluster (less than one job per cpu), but last time I checked
> mosix didn't support sockets (used for MPI communication).
>
> Big shared memory machines are great with MPI, but quite costly, so
> most people use linux clusters (with or without fast myrinet or scali
> networking)...
>
> Cheers,
>
> Erik
>
>
>
>
>
> On Sunday, August 17, 2003, at 10:22 PM, Mike Grommet wrote:
>
> > I have learned from this group that Gromacs cannot utilize an openmosix
> > cluster...
> >
> > Can gromacs utilize an openssi cluster, a single system image cluster?
> >
> > This seems like it might be a FAQ but I had no luck finding
> > information on
> > the site, or in the mailing list...
> >
> >
> > Thanks for your help...
> >
> >
> >
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