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Subject: Re: [OMPI users] single data/ mutilple processes
From: Jim Kress (jimkress_35_at_[hidden])
Date: 2009-01-03 15:35:50


Never mind. I figured it out for myself.

Jim

On Sat, 2009-01-03 at 13:51 -0500, Jim Kress wrote:
> Hi Jody,
>
> I did not explain my problem very well.
>
> I have an application called mdrun. It was compiled and linked using
> openMPI. I want to run mdrun on 8 nodes of my cluster in parallel.
> Just me. Not multiple users. So I want to launch the openMPI version
> of mdrun so that it only uses the input files on the node from which it
> is launched (the head node) and does not look for any input files on the
> other seven nodes where it spawns the 7 other processes.
>
> With MPICH I use the procgroup capability and mdrun only looks for its
> input files on the node from which it is launched, using the same mdrun
> parameters as the ones I tried to use with openMPI
>
> So, how can I replicate the behavior of MPICH with openMPI?
>
> Thanks for your help.
>
> Jim
>
>
>
>
>
> On Sat, 2009-01-03 at 17:46 +0100, jody wrote:
> > Hi Jim
> > If all of your workers can mount a directory on your head node,
> > all can access the data there.
> >
> > Jody
> >
> >
> > On Sat, Jan 3, 2009 at 4:13 PM, Jim Kress <jimkress_35_at_[hidden]> wrote:
> > > I need to use openMPI in a mode where the input and output data reside
> > > on one node of my cluster while all the other nodes are just used for
> > > computation and send data to/from the head node.
> > >
> > > All I can find in the documentation are cases showing how to use openMPI
> > > for cases where input and output data reside on all the nodes.
> > >
> > > Will anyone please show me the command line I need to use to accomplish
> > > my single data/ multiple node calculation?
> > >
> > > Thanks.
> > >
> > > Jim
> > >
> > >
> > > _______________________________________________
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> > > users_at_[hidden]
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> > >