[Beowulf] Re: scyld and jaguar

Michael Will mwill at penguincomputing.com
Mon Mar 22 18:01:00 EST 2004

I agree that rather than compiling your own MPICH you should try to make it 
work with the existing one. However 
1) there is no source
2) the binary is statically linked.
3) Scyld does have an mpirun which should set the enviromentvariables right. 

The right attempt is to make it use bpsh instead of rsh or ssh. I saw that 
some of the calls are done with shell scripts, which might be a way to fix it 
as well if the enviroment variables don't help.

On Monday 22 March 2004 02:56 pm, Sean Dilda wrote:
> On Mon, 2004-03-22 at 15:15, desi star wrote:
> > Hi Mike,
> >
> > Thanks much for responding. Jaguar is indeed staticaly
> > linked to the MPICH libraries as per manuals. When I
> > ran the ldd commands as you suggested:
> >
> > --
> > $ ldd Jaguar
> >   not a dynamic executable
> > $
> > --
> >
> > Thats why the very first step sugested in the Jaguar
> > installation is to build and configure MPICH from the
> > start. Where do I go from here?
> I'm not familiar with Jaguar, but I am somewhat familiar with Scyld.  I
> believe you are taking the wrong approach with this.
> Even though Jaguar says you should start with building mpich, I don't
> think that's what you want to do.  You almost certainly want to stick
> with the MPICH binaries that were provided by Scyld.  First make sure
> there is no confusion and remove the copy of mpich that you built.  Next
> make sure the mpich and mpich-devel packages are installed on your
> system.  'rpm -q mpich ; rpm -q mpich-devel' should tell you this.  If
> they're not, 'rpm -i mpich-XXXXX.rpm' should install the package.  You
> can find the packages on your Scyld cd(s).
> Once you have those packages installed, then attempt to compile jaguar.
> It should link against Scyld's copy of mpich and just work.  I suggest
> following Scyld's instructions for running mpich jobs, not Jaguars.
> Scyld has made adjustments to their copy of MPICH that make it work
> right on their system.  In the process they also change the way jobs are
> launched.  So Scyld may not have 'mpirun', but has a better way to start
> the job.
> As Michael pointed out, Scyld's version of MPICH doesn't require rsh,
> ssh, or anything like it.  So your questions along those lines are
> somewhat moot.
> Sean

Michael Will, Linux Sales Engineer
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