.. _tutorial_mandelbrot_osg:

Part 5: A More Complex Example: Mandelbrot (OSG VERSION)
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Description... why is this different from XSEDE?

Hands-On: Mandelbrot with Condor on OSG
=======================================

**This examples assumes that you are logged in to an OSG gateway node and that
you can submit regular Condor jobs from that node to OSG.** 

In order for this example to work, we need to install an additional Python
module, the Python Image Library (PIL). This is done via pip:

.. code-block:: bash

    pip install PIL

Next, we need to download the Mandelbrot fractal generator itself as well as the
shell wrapper scrip. It is really just a very simple python script that, if
invoked on the command line, outputs a full or part of a Mandelbrot fractal as a
PNG image. Download the scripts into your $HOME directory:

.. code-block:: bash

    curl --insecure -Os https://raw.githubusercontent.com/radical-cybertools/radical.saga/devel/examples/tutorial/mandelbrot/mandelbrot.py
    curl --insecure -Os https://raw.githubusercontent.com/radical-cybertools/radical.saga/devel/examples/tutorial/mandelbrot/mandelbrot.sh

You can give mandelbrot.py a test-drive locally by calculating a single-tiled
1024x1024 Mandelbrot fractal:

.. code-block:: bash

    python mandelbrot.py 1024 1024 0 1024 0 1024 frac.gif

In your ``$HOME`` directory, open a new file saga_mandelbrot_osg.py with your 
favorite editor and paste the following content :download:`here <../../../examples/tutorial/mandelbrot/saga_mandelbrot_osg.py>`:

.. literalinclude:: ../../../examples/tutorial/mandelbrot/saga_mandelbrot_osg.py