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OpenMPI with Infiniband: 

• Clone psana environment then remove mpi4py, mpich, and mpi.
• Build openmpi on drp nodes (drp-tst-dev011 was used for this test). No special flag needed just use --prefix to put the build somewhere.

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• Existing pre-built is located at ~monarin/tmp/4.0.0-rhel7.
• Build mpi4py using this openmpi (see recipe on relmanage/recipe)

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cd ~/tmp

git clone https://github.com/mpi4py/mpi4py.git

cd mpi4py

export PATH=/cds/home/m/monarin/tmp/4.0.0-rhel7/bin:$PATH

which mpicc

python setup.py install  --single-version-externally-managed --record=record.txt

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• Running it with (for example), 

~/tmp/4.0.0-rhel7/bin/mpirun --hostfile openmpi_hosts --mca btl_openib_allow_ib 1 run_slac.sh

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