Well, a couple of things come to mind - see below

On Mar 20, 2013, at 9:41 AM, Bruno Cramer <bruno.cramer@gmail.com> wrote:

1) Openmpi in PC1
I installed openmpi-1.4.3 using the OpenSuse 32b v. 12.1 repository
as well as openmpi devel
All mpi executables are present so are the libraries in lib directory.
I set the environment as ( .bashrc)

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/mpi/gcc/openmpi/lib
export PATH

You should reverse the ordering here - always put the OMPI path element first, then the existing one, to ensure that you are getting the intended version. Lot of operating systems come with an older version pre-installed in a standard location.

When I run any of the test examples (eg. mpirun hello_c.c or any program that has mpi interface included I get the message
mpirun was unable to launch the specified application as it could not find an executable:
Executable: hello_c.c
Node: linux-curie
while attempting to start process rank 0.

Look at the executable - apparently, you tried to run the ".c" source code instead of the compiled executable :-)

typing echo $LD_LIBRARY_PATH I should get something like /usr/lib/mpi/gcc/openmpi/lib. The only output I get is /usr/local/atlas3.10/lib (which is the blas/lapack library). Also Intel compilers library is not shown.

I suspect that your original LD_LIBRARY_PATH was empty, so now the path starts with a ":" and makes bash unhappy. Try reversing the order as above and it might work.

1) Openmpi installation in PC2
In OpenSuse v 12.1 64b I installed openmpi-1.4.3 downloading it from the openmpi site.
No error occured during ./configure, make, make install process.
The environment settings change a little but are very similar to those mentioned under PC1.
The same message as above is occuring.
in this case typing echo $LD_LIBRARY_PATH I get the correct output from the mpi library as /usr/local/lib64 and the executables are in /usr/local/bin.

Any help is wellcome

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