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<div class="section" id="appendix">
<h1>Appendix<a class="headerlink" href="#appendix" title="Permalink to this headline">¶</a></h1>
<div class="section" id="mpi-enabled-python-interpreter">
<span id="python-mpi"></span><h2>MPI-enabled Python interpreter<a class="headerlink" href="#mpi-enabled-python-interpreter" title="Permalink to this headline">¶</a></h2>
<blockquote>
<div><div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">These days it is no longer required to use the MPI-enabled Python
interpreter in most cases, and, therefore, is not built by
default anymore because it is too difficult to reliably build a
Python interpreter across different distributions. If you know
that you still <strong>really</strong> need it, see below on how to use the
<cite>build_exe</cite> and <cite>install_exe</cite> commands.</p>
</div>
</div></blockquote>
<p>Some MPI-1 implementations (notably, MPICH 1) <strong>do require</strong> the
actual command line arguments to be passed at the time
<code class="xref c c-func docutils literal notranslate"><span class="pre">MPI_Init()</span></code> is called. In this case, you will need to use a
re-built, MPI-enabled, Python interpreter binary executable. A basic
implementation (targeting Python 2.X) of what is required is shown
below:</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span> <span class="cpf"><Python.h></span><span class="cp"></span>
<span class="cp">#include</span> <span class="cpf"><mpi.h></span><span class="cp"></span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span>
<span class="p">{</span>
<span class="kt">int</span> <span class="n">status</span><span class="p">,</span> <span class="n">flag</span><span class="p">;</span>
<span class="n">MPI_Init</span><span class="p">(</span><span class="o">&</span><span class="n">argc</span><span class="p">,</span> <span class="o">&</span><span class="n">argv</span><span class="p">);</span>
<span class="n">status</span> <span class="o">=</span> <span class="n">Py_Main</span><span class="p">(</span><span class="n">argc</span><span class="p">,</span> <span class="n">argv</span><span class="p">);</span>
<span class="n">MPI_Finalized</span><span class="p">(</span><span class="o">&</span><span class="n">flag</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">flag</span><span class="p">)</span> <span class="n">MPI_Finalize</span><span class="p">();</span>
<span class="k">return</span> <span class="n">status</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The source code above is straightforward; compiling it should also
be. However, the linking step is more tricky: special flags have to be
passed to the linker depending on your platform. In order to alleviate
you for such low-level details, <em>MPI for Python</em> provides some
pure-distutils based support to build and install an MPI-enabled
Python interpreter executable:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ cd mpi4py-X.X.X
$ python setup.py build_exe [--mpi=<name>|--mpicc=/path/to/mpicc]
$ [sudo] python setup.py install_exe [--install-dir=$HOME/bin]
</pre></div>
</div>
<p>After the above steps you should have the MPI-enabled interpreter
installed as <code class="file docutils literal notranslate"><em><span class="pre">prefix</span></em><span class="pre">/bin/python</span><em><span class="pre">X</span></em><span class="pre">.</span><em><span class="pre">X</span></em><span class="pre">-mpi</span></code> (or
<code class="file docutils literal notranslate"><span class="pre">$HOME/bin/python</span><em><span class="pre">X</span></em><span class="pre">.</span><em><span class="pre">X</span></em><span class="pre">-mpi</span></code>). Assuming that
<code class="file docutils literal notranslate"><em><span class="pre">prefix</span></em><span class="pre">/bin</span></code> (or <code class="file docutils literal notranslate"><span class="pre">$HOME/bin</span></code>) is listed on your
<span class="target" id="index-0"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PATH</span></code>, you should be able to enter your MPI-enabled Python
interactively, for example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ python2.7-mpi
Python 2.7.8 (default, Nov 10 2014, 08:19:18)
[GCC 4.9.2 20141101 (Red Hat 4.9.2-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.executable
'/usr/bin/python2.7-mpi'
>>>
</pre></div>
</div>
</div>
<div class="section" id="building-mpi-from-sources">
<span id="building-mpi"></span><h2>Building MPI from sources<a class="headerlink" href="#building-mpi-from-sources" title="Permalink to this headline">¶</a></h2>
<p>In the list below you have some executive instructions for building
some of the open-source MPI implementations out there with support for
shared/dynamic libraries on POSIX environments.</p>
<ul>
<li><p class="first"><em>MPICH</em></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ tar -zxf mpich-X.X.X.tar.gz
$ cd mpich-X.X.X
$ ./configure --enable-shared --prefix=/usr/local/mpich
$ make
$ make install
</pre></div>
</div>
</li>
<li><p class="first"><em>Open MPI</em></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ tar -zxf openmpi-X.X.X tar.gz
$ cd openmpi-X.X.X
$ ./configure --prefix=/usr/local/openmpi
$ make all
$ make install
</pre></div>
</div>
</li>
<li><p class="first"><em>MPICH 1</em></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ tar -zxf mpich-X.X.X.tar.gz
$ cd mpich-X.X.X
$ ./configure --enable-sharedlib --prefix=/usr/local/mpich1
$ make
$ make install
</pre></div>
</div>
</li>
</ul>
<p>Perhaps you will need to set the <span class="target" id="index-1"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">LD_LIBRARY_PATH</span></code>
environment variable (using <strong class="command">export</strong>, <strong class="command">setenv</strong> or
what applies to your system) pointing to the directory containing the
MPI libraries . In case of getting runtime linking errors when running
MPI programs, the following lines can be added to the user login shell
script (<code class="file docutils literal notranslate"><span class="pre">.profile</span></code>, <code class="file docutils literal notranslate"><span class="pre">.bashrc</span></code>, etc.).</p>
<ul>
<li><p class="first"><em>MPICH</em></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>MPI_DIR=/usr/local/mpich
export LD_LIBRARY_PATH=$MPI_DIR/lib:$LD_LIBRARY_PATH
</pre></div>
</div>
</li>
<li><p class="first"><em>Open MPI</em></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>MPI_DIR=/usr/local/openmpi
export LD_LIBRARY_PATH=$MPI_DIR/lib:$LD_LIBRARY_PATH
</pre></div>
</div>
</li>
<li><p class="first"><em>MPICH 1</em></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>MPI_DIR=/usr/local/mpich1
export LD_LIBRARY_PATH=$MPI_DIR/lib/shared:$LD_LIBRARY_PATH:
export MPICH_USE_SHLIB=yes
</pre></div>
</div>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">MPICH 1 support for dynamic libraries is not completely
transparent. Users should set the environment variable
<span class="target" id="index-2"></span><code class="xref std std-envvar docutils literal notranslate"><span class="pre">MPICH_USE_SHLIB</span></code> to <code class="docutils literal notranslate"><span class="pre">yes</span></code> in order to avoid link
problems when using the <strong class="program">mpicc</strong> compiler wrapper.</p>
</div>
</li>
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<li><a class="reference internal" href="#mpi-enabled-python-interpreter">MPI-enabled Python interpreter</a></li>
<li><a class="reference internal" href="#building-mpi-from-sources">Building MPI from sources</a></li>
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