OpenMPI and MPI4py installation instructions for Ubuntu 16.04.

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The instructions are to install MPI4Py by building from source. MPI4Py requires OpenMPI or similar mpicc compiler wrapper. So let us first install OpenMPI. For that, download the installation files first. 
wget https://download.open-mpi.org/release/open-mpi/v3.1/openmpi-3.1.0.tar.gz
Extract the file and open it.
tar -zxf openmpi-3.1.0.tar.gz
cd openmpi-3.1.0/
Configure the installation files by running the following code:
./configure --prefix="/home/$USER/.openmpi"
Now, we can make and install the files.
sudo make -j4
sudo make install
If there are no errors, OpenMPI is successfully installed. To get the env paths linked correctly, include the following in the .bashrc file.
export PATH="$PATH:/home/$USER/.openmpi/bin"
export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/home/$USER/.openmpi/lib/"
Run source ~/.bashrc to make the changes available in current session.
Confirm that OpenMPI is successfully installed run:
mpiexec -V
This will print you the version of MPI installed. Good job if you got that right !

Install MPI4Py.

Requirements

sudo apt-get install libopenmpi-dev python-dev python3-dev
Download the installation files.
wget https://bitbucket.org/mpi4py/mpi4py/downloads/mpi4py-3.0.0.tar.gz
Extract the file and open it.
tar -zxf mpi4py-3.0.0.tar.gz
cd mpi4py-3.0.0/
Now we need to build and install the files. For this run these:
sudo python setup.py build
sudo python setup.py install
or use python3 if required.
sudo python3 setup.py build
sudo python3 setup.py install
If the build and install process went well, you have MPI4Py successfully installed on your system. Now let us confirm that. Run (in the mpi4py-3.0.0 folder):
mpiexec -n 5 python demo/helloworld.py
If the installation went well, you should see the Hello, World! output from 5 different nodes.

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