Scyld and MPI: Is it possible to launch MPI-Program on Nodes only

Thomas R Boehme mail at thomas-boehme.de
Mon Dec 11 09:45:13 EST 2000


Hi,

Unfourtunatly, it's not that easy with beompi from the Scyld Distribution.
-nolocal doesn't work. I took a look at the source code myself and one
comment says, that the root process has to be started on the head
node. I did change the code so it actually doesn't use the head node, but
then, the jobs won't run successfully.

The problem is, that the slave nodes with the Scyld distribution don't have
a full linux install (actually, they only have some libs and the use beoproc
to start jobs on them). Therefore, one cannot use ssh or rsh either.
Using bpsh (the equivalent of rsh for the Scyld Distribution) doesn't
work either.

Any help is greatly appreciated,
Thomas Boehme


> -----Original Message-----
> From: Dave Leimbach [mailto:dleimbac at MPI-Softtech.Com]
> Sent: Monday, December 11, 2000 8:23 AM
> To: Carey F. Cox
> Cc: Thomas R Boehme; 'beowulf at beowulf.org'
> Subject: Re: Scyld and MPI: Is it possible to launch MPI-Program on
> Nodes only
> 
> 
> I don't know if they (Scyld) have this as an option in their 
> mpirun but at
> MPI-Softtech we have a machines file describing exactly what 
> machines will
> run the job.
> 
> I may take a look at the source code for Scyld mpirun later to see how
> difficult it is to add this functionality.  It would be useful to even
> split half the cluster to one job and another half to another job...
> 
> Dave
> 
> On Mon, 11 Dec 2000, Carey F. Cox wrote:
> 
> > On Sun, 10 Dec 2000, Thomas R Boehme wrote:
> > 
> > > Hi,
> > >
> > > is there any way to launch MPI-jobs with beompi without 
> running them on the
> > > head node also?
> > > We want to run multiple jobs on our cluster and don't 
> want to use the head
> > > node for more than
> > > one of the jobs (actually, we'd like not to use it at all).
> > >
> > > Thomas Boehme
> > >
> > 
> > Thomas,
> > 
> > First, I must qualify this reply; I am not familiar with Scyld's
> > implementation of mpi. Having said that, most versions of mpi that
> > I am familiar with have a -nolocal option for mpirun. This option
> > tells mpi to not run on the local node, i.e. the one you start it
> > on. An example...
> > 
> > 	# mpirun -nolocal -np 8 ./a.out
> > 
> > Hope that helps.
> > 
> > Carey
> > 
> > -- 
> >  
> ======================================================================
> > <>  Carey F. Cox, PhD          |  PHONE: (318) 257-3770     
>           <>
> > <>  Assistant Professor        |  FAX:   (318) 257-2306     
>           <>
> > <>  Dept. of Mech. Eng.        |  EMAIL: 
> cfcox at coes.latech.edu        <>
> > <>  Louisiana Tech University  |  WEB:   
> http://www.latech.edu/~cfcox <>
> >  
> ======================================================================
> > 
> > 
> > _______________________________________________
> > Beowulf mailing list
> > Beowulf at beowulf.org
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> > 
> 

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