Open MPI requires that there be no TCP firewall between hosts that are
used in a single parallel job -- it uses random TCP ports between peers.
On Feb 5, 2009, at 2:39 AM, Robertson Burgess wrote:
I have checked with IT. It is TCP. I have been told that there's a
firewall on the nodes. Should I open some ports on the firewall, and
if so, which ones?
Robertson
Robertson Burgess 5/02/2009 5:09 pm >>>
Thankyou for your help.
I tried the command
mpirun -np 4 -host node1,node2 -mca btl tcp,self random
but still got the same result.
I'm pretty sure that the communication between the nodes is TCP but
I'm not sure, I've emailedIT support to ask them, but am yet to hear
back from them.
Other than that I'm running the latest release of OMPI (1.3) and I
installed it on both nodes. And yes they are in the same absolute
paths.
My configuration was very standard:
shell$ gunzip -c openmpi-1.3.tar.gz | tar xf -
shell$ cd openmpi-1.3
shell$ ./configure CC=icc CXX=icpc F77=ifort FC=ifort --prefix=/
home/bburgess/bin/bin
shell$ make all install
Again thankyou for your help, I'll have to investigate whether my
assumption about my connections being TCP are correct. When I was
setting it up at first, and before I'd configured the nodes to log
into each other without a password, I did get the message
user@ node.newcastle.edu.au's password:
In my log files, so it did at least seem to be reaching the other
node. Does that mean that my connections are working, or could it be
more to it than that?
Robertson Burgess
Message: 2
Date: Wed, 4 Feb 2009 15:37:44 +0200
From: Lenny Verkhovsky <lenny.verkhov...@gmail.com>
Subject: Re: [OMPI users] OpenMPI hangs across multiple nodes.
To: Open MPI Users <us...@open-mpi.org>
Message-ID:
<453d39990902040537o45137abbh2f12db423d971...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
what kind of communication between nodes do you have - tcp, openib (
IB/IWARP ) ?
you can try
mpirun -np 4 -host node1,node2 -mca btl tcp,self random
On Wed, Feb 4, 2009 at 1:21 AM, Ralph Castain <r...@lanl.gov> wrote:
Could you tell us which version of OpenMPI you are using, and how
it was
configured?
Did you install the OMPI libraries and binaries on both nodes? Are
they in
the same absolute path locations?
Thanks
Ralph
On Feb 3, 2009, at 3:46 PM, Robertson Burgess wrote:
Dear users,
I am quite new to OpenMPI, I have compiled it on two nodes, each
node with
8 CPU cores. The two nodes are identical. The code I am using
works in
parallel across the 8 cores on a single node. However, whenever I
try to run
across both nodes, OpenMPI simply hangs. There is no output
whatsoever, when
I run it in background, outputting to a log file, the log file is
always
empty. The cores do not appear to be doing anything at all, either
on the
host node or on the remote node. This happens whether I am running
my code,
or even if I when I tell it to run a process that doesn't even
exist, for
instance
mpirun -np 4 -host node1,node2 random
Simply results in the terminal hanging, so all I can do is close the
terminal and open up a new one.
mpirun -np 4 -host node1,node2 random >& log.log &
simply produces and empty log.log file
I am running Redhat Linux on the systems, and compiled OpenMPI
with the
Intel Compilers 10.1. As I've said, it works fine on one node. I
have set up
both nodes such that they can log into each other via ssh without
the need
for a password, and I have altered my .bashrc file so the PATH and
LD_LIBRARY_PATH include the appropriate folders.
I have looked through the FAQ and mailing lists, but I was unable
to find
anything that really matched my problem. Any help would be greatly
appreciated.
Sincerely,
Robertson Burgess
University of Newcastle
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