openmpi on ubuntu

[Joris Pinkse]

Hello,

I'm completely new to mpi and trying to run an mpi version of
hello_world on a single machine with 6 cores, using

mpirun -np 4 ./mpi_hello

It neither does anything nor returns. I'm using the openmpi (1.5)
packages that come with ubuntu 12.04.

What could be causing this? Is this a firewall issue? Any idea on how
I can resolve this?

Thanks!

J.

P.S.: Using my local machine to test my code before running jobs on a
cluster.

[Georg Bisseling]

MPI is only a standardized API, but it is not a binary or a wire protocol
standard.

That means, that the
- include files and libraries used when compiling,
- dynamic libraries used when running and
- the scripts used like mpirun
all have to be taken from the VERY(*) same MPI implementation.

Failing in doing so might be the most common source of problems.

(*) In case you know exactly what to do you may skip a minor version
number ;-)

Hope this helps
Georg

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