1. Running the trunk of CASA with MPI

• If your desktop does not have the MPI libraries installed (NRAO computers should have them), do the following:

yum install casa01-openmpi.x86_64 casa01-mpi4py.x86_64

• Build CASA normally. Verify that mpicasa, which is a thin wrapper for mpirun/mpiexec, is installed in the correct place:

which mpicasa
/usr/lib64/casa/01/bin/mpicasa

• Run a CASA session with the MPI executable. Run the mpi4casa functional tests for example:

mpicasa -n 4 casapy -c <install-path>/runUnitTest.py test_mpi4casa

• Where 4 is the number of cores to run CASA in parallel.

2. Running MPI with the CASA binaries

• Use the latest casa-stable or casa-test packages, which contain the MPI libraries. The latest today are:

https://svn.cv.nrao.edu/casa/linux_distro/stable/el6/casa-stable-4.4.94.tar.gz
https://svn.cv.nrao.edu/casa/linux_distro/test/el6/casa-test-4.4.107.tar.gz

• Run as follows:

<path-to-casa-binaries>/mpicasa -n num_cores <path-to-casa-binaries>/casapy

• As of today, there is still an issue with these libraries when running mpicasa in a cluster.