# Installation

This section describes the necessary steps for installing PyPDEVS.

## Dependencies

The following dependencies are mandatory:

- Python 2.7 or Python 3.6+

For parallel and distributed simulation, the following additional dependencies are required:

- MPICH3 with socket device

- mpi4py

Installation instructions are given for these two dependencies further in this section.

Realtime simulation using the Tk backend, obviously requires Tk.

## Download

The most up-to-date version of PyPDEVS can be obtained from the git repository:

    git clone https://msdl.uantwerpen.be/git/yentl/PythonPDEVS.git

Alternatively, the latest release can be downloaded via:

  https://msdl.uantwerpen.be/git/yentl/PythonPDEVS/archive/master.zip

## PyPDEVS Installation

Execute the following command in the ‘src’ folder:

    python setup.py install --user

Afterwards, PyPDEVS should be installed. This can easily be checked with the command:

    python -c "import pypdevs"

If this returns without errors, PyPDEVS is sucessfully installed.

## Parallel and distributed simulation with mpi4py

Note

An installation script for mpi4py and MPICH3 is provided in `install_mpi4py.sh`. At the end, you will still need to add mpi to your PATH though, as explained by the script.

First of all, an MPI middleware has to be installed, for which I recommend MPICH3. Due to some non-standard configuration options, it is required to install MPICH manually instead of using the one from the repositories.

You can use either the official installation guide, or follow the steps below. Just make sure that the correct configuration options are used.

The following commands should work on most systems, just replace the ‘/home/you’ part with a location of your choosing:

    mkdir mpich-build
    mkdir mpich
    base=`pwd`
    cd mpich-build
    wget http://www.mpich.org/static/downloads/3.1.2/mpich-3.1.2.tar.gz
    tar -xvzf mpich-3.1.2.tar.gz
    cd mpich-3.1.2
    ./configure --prefix=$base/mpich --with-device=ch3:sock --disable-fortran
    make
    make install
    export PATH=$base/mpich/bin:$PATH
    cd ../..

You will probably want to put this final export of PATH to your .bashrc file, to make sure that mpi is found in new terminals too. After that, make sure that the following command does not cause any errors and simply prints your hostname 4 times:

    mpirun -np 4 hostname

Now you just need to install mpi4py, which is easy if you have MPICH installed correctly:

    mkdir mpi4py
    cd mpi4py
    wget https://pypi.python.org/packages/source/m/mpi4py/mpi4py-1.3.1.tar.gz
    tar -xvzf mpi4py-1.3.1.tar.gz
    cd mpi4py-1.3.1
    python setup.py build --mpicc=../../mpich/bin/mpicc
    python setup.py install --user
    cd ../..

Testing whether or not everything works can be done by making sure that the following command prints ‘4’ four times:

    mpirun -np 4 python -c "from mpi4py import MPI; print(MPI.COMM_WORLD.Get_size())"