What version of OpenMPI is supported?

Just Starting
1

I am trying to run the Euler vortex example, but I am stymied with the following error:

…//python3.4/site-packages/mpi4py/MPI.cpython-34m.so: undefined symbol: ompi_mpi_op_no_op

I am guessing that this has to do with OpenMPI version against which mpi4py configured itself.

I am running 1.8.3, but can change this to anything actually as long as I know which version I need. Also… I am trying to use the CUDA backend and am not attempting to run a parallel job so why is OpenMPI being invoked?

Thanks,

V.

2

Hi Victor,

I am trying to run the Euler vortex example, but I am stymied with the
following error:

..//python3.4/site-packages/mpi4py/MPI.cpython-34m.so: undefined symbol:
ompi_mpi_op_no_op

I am guessing that this has to do with OpenMPI version against which
mpi4py configured itself.

I am running 1.8.3, but can change this to anything actually as long as
I know which version I need. Also... I am trying to use the CUDA backend
and am not attempting to run a parallel job so why is OpenMPI being invoked?

PyFR should work with any recent version of MPI. However, it is crucial
that when you change your MPI library that you also recompile mpi4py.
My guess for the above is that mpi4py has been compiled against
something like OpenMPI while the current MPI is say mpich2.

When PyFR starts up it has no idea if it is running as a parallel job or
not. The only way we can find this out is by initialising MPI and
seeing how many ranks there are. Hence, it is always necessary for PyFR
to initalise MPI.

Regards, Freddie.

3

Thanks Freddie,

that was helpful. The error was in my environment settings. I do in fact only have openmpi installed, but the environment is not set up exactly right, apparently.

when I execute PyFr with

/opt/openmpi-1.8.3/bin/mpirun -np 1 pyfr run -b cuda

it runs.

I now have another question, but will open a new thread.

V.