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From: Sang Chul Choi (goshng_at_[hidden])
Date: 2006-04-16 14:14:58

Thank you, Brian:

It worked.

Thank you, again.

On 4/16/06, Brian Barrett <brbarret_at_[hidden]> wrote:
> On Apr 16, 2006, at 8:18 AM, Sang Chul Choi wrote:
> > 1. I could not find any document except FAQ and mailing list
> > for Open MPI. Is there any user manual or something like that?
> > Or, the LAM MPI's manual can be used instead?
> Unfortunately, at this time, the only documentation available for
> Open MPI is the FAQ and the mailing list. There are some fairly
> significant differences between Open MPI and LAM/MPI, so while the
> LAM/MPI manuals could be a start, there are some fairly significant
> differences.
> > 2. Another question is about installation.
> > If I want to use rsh/ssh for Open MPI, do I have to install
> > Open MPI on all master and slave nodes? Or, should I use
> > something like NSF file system so that even though I installed
> > Open MPI on only master node, all the other salve nodes could
> > see Open MPI installation in the master node?
> Like LAM/MPI, Open MPI doesn't really care on this point. This is
> also somewhat of a religious point -- people seem to have strong
> opinions either way. The advantage of the NFS approach is that it
> makes it trivial to keep the software installs in sync on all the
> nodes. The advantage of the installation on local disk approach is
> that there is significantly less strain on the NFS server during
> process startup. For development, I tend to go with the NFS
> approach, since I'm constantly updating my installation. For large
> cluster production installs, I prefer the installation on each node
> approach. But unless your cluster is really large (or your NFS
> server is really slow) either approach should work.
> > The error I have is from I wanted to run a program on two slave
> > nodes but shell complained that there is no orted. It is true
> > that there is no installation of Open MPI on each slave node.
> Yes, that is the expected error if you try to run on a node without
> an Open MPI installation. If you ensure that a copy of Open MPI is
> installed (and in your path) on each node, your problem should go away.
> Hope this helps,
> Brian
> --
> Brian Barrett
> Open MPI developer
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> users_at_[hidden]

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