How to install OpenMPI, mpi4py, and petsc4py for use with OpenMDAO on OS X with Anaconda

mpi_and_petsc_for_openmdao_osx_anaconda.md

1. Install OpenMPI

1.a Download OpenMPI: https://www.open-mpi.org/software/ompi/v1.10/

1.b Extract and configure

  cd ~/Downloads/openmpi-1.10.0
  mkdir build
  cd build
  # I prefer to keep /usr/local clean, so I put it in /opt/openmpi
  ../configure --prefix=/opt/openmpi --with-devel-headers --enable-binaries
  make
  sudo make install

1.c Add the following to your bash profile

  export DYLD_LIBRARY_PATH=${DYLD_LIBRARY_PATH}:/opt/openmpi/lib
  export PATH=${PATH}:/opt/openmpi/bin      

2. Install mpi4py

git clone https://github.com/mpi4py/mpi4py.git ./mpi4py.git
cd mpi4py.git
python setup.py build --mpicc=/opt/openmpi/bin/mpicc  
python setup.py install

3. Petsc and petsc4py

git clone https://bitbucket.org/petsc/petsc.git ./petsc.git
cd petsc.git
python setup.py build
python setup.py install
cd ..
git clone https://bitbucket.org/petsc/petsc4py.git ./petsc4py.git
cd petsc4py.git
python setup.py build
python setup.py install

The 'Install mpi4py' step is likely missing an install step:
python setup.py install
or:
python setup.py install --user

Thanks for catching that, updated.

Can we make a note in this to not get the latest petsc ? OpenMDAO doesn't work with the latest. 3.9 works but 3.10 does not. SO need to do git checkout v3.9.4