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macos_mpi_install.html
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<title>MPI on macOS</title>
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<div class="sect1">
<h2 id="_mpi_on_macos">MPI on macOS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Repast4Py requires that a working MPI implementation be
installed. On macOS, the MPICH MPI implementation can be installed using the <a href="https://brew.sh">Homebrew</a> package manager, or compiled from source. In either case, first
install the macOS Xcode command line tools, if necessary, by running the following in a terminal window.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span>xcode-select -install</code></pre>
</div>
</div>
<div class="paragraph">
<p>This will start a dialog for the tools installation.</p>
</div>
<div class="sect2">
<h3 id="_homebrew">Homebrew</h3>
<div class="paragraph">
<p>To install MPICH using the homebrew package manager, first install
Homebrew by going to the <a href="https://brew.sh">Homebrew</a> site, and
follow the installation instructions. Once Homebrew is installed, install MPICH
by running the following in a terminal window.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span>% /opt/homebrew/bin/brew install mpich</code></pre>
</div>
</div>
<div class="paragraph">
<p>Check if the install was successful with by running one of the MPICH MPI compiler
wrappers.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span> % /opt/homebrew/bin/mpicxx --version
Apple clang version <span class="tok-m">14</span>.0.0 <span class="tok-o">(</span>clang-1400.0.29.102<span class="tok-o">)</span>
Target: arm64-apple-darwin21.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
The version information might differ.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_compile_mpich_from_source">Compile MPICH from Source</h3>
<div class="paragraph">
<p>Once the command line tool installation is complete, download the mpich source from <a href="https://www.mpich.org/downloads">here</a>, any recent stable version will work. The source then needs to be unarchived, configured, and compiled in a terminal window.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span><span class="tok-c1"># cd to wherever the mpich tar ball was downloaded (e.g, ~/Downloads)</span>
% <span class="tok-nb">cd</span> ~/Downloads
<span class="tok-c1"># Replace mpich-4.0.3.tar.gz with the downloaded version</span>
% tar xf mpich-4.0.3.tar.gz
% <span class="tok-nb">cd</span> mpich-4.0.3
<span class="tok-c1"># Replace $HOME/sfw/mpich-4.0.3 with where you want to install mpich</span>
% ./configure --disable-fortran --prefix<span class="tok-o">=</span><span class="tok-nv">$HOME</span>/sfw/mpich-4.0.3
<span class="tok-c1"># Compile and install the source</span>
% make install</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
The compilation will take a few minutes or more, depending on your
machine.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_testing_the_mpi_installation">Testing the MPI Installation</h3>
<div class="paragraph">
<p>Once MPICH is installed, we can test the MPI installation by installing the <code>mpi4py</code> Python package
which requires a MPI installation, and is itself a Repast4Py requirement.
As part of its installation <code>mpi4py</code> needs to be able to find the MPI
compilation wrappers installed as part of MPI implementation.
To determine if the wrappers can be found, run the following in a
terminal window.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span>% mpicc --version</code></pre>
</div>
</div>
<div class="paragraph">
<p>If the wrappers are not found, you will see an error like <code>zsh: command not found: mpicc</code>, and you will need to add the wrapper location to the <code>PATH</code> environment variable. If you installed via Homebrew, this will be <code>/opt/homebrew/bin</code>. If you installed from source, this will be the install directory specified
in the <code>prefix</code> argument plus <code>/bin</code> (e.g., <code>$HOME/sfw/mpich-4.0.3/bin</code>).</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span><span class="tok-c1"># Replace X with `opt/homebrew` for Hombrew or wherever you installed mpich</span>
<span class="tok-c1"># for source</span>
% <span class="tok-nb">export</span> <span class="tok-nv">PATH</span><span class="tok-o">=</span>X/bin:<span class="tok-nv">$PATH</span>
% mpicc --version
Apple clang version <span class="tok-m">14</span>.0.0 <span class="tok-o">(</span>clang-1400.0.29.102<span class="tok-o">)</span>
Target: arm64-apple-darwin21.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin</code></pre>
</div>
</div>
<div class="paragraph">
<p>In the same terminal window, install and test <code>mpi4py</code> by importing it.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span>% pip3 install mpi4py
Collecting mpi4py
...
% python3
Python <span class="tok-m">3</span>.9.6 <span class="tok-o">(</span>default, Aug <span class="tok-m">5</span> <span class="tok-m">2022</span>, <span class="tok-m">15</span>:21:02<span class="tok-o">)</span>
<span class="tok-o">[</span>Clang <span class="tok-m">14</span>.0.0 <span class="tok-o">(</span>clang-1400.0.29.102<span class="tok-o">)]</span> on darwin
Type <span class="tok-s2">"help"</span>, <span class="tok-s2">"copyright"</span>, <span class="tok-s2">"credits"</span> or <span class="tok-s2">"license"</span> <span class="tok-k">for</span> more information.
>>> from mpi4py import MPI</code></pre>
</div>
</div>
<div class="paragraph">
<p>Assuming the <code>mpi4py</code> install is successful, install Repast4Py and
test it with an import.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="zsh"><span></span>% <span class="tok-nv">CC</span><span class="tok-o">=</span>mpicxx pip3 install repast4py
Collecting repast4py
...
% python3
Python <span class="tok-m">3</span>.9.6 <span class="tok-o">(</span>default, Aug <span class="tok-m">5</span> <span class="tok-m">2022</span>, <span class="tok-m">15</span>:21:02<span class="tok-o">)</span>
<span class="tok-o">[</span>Clang <span class="tok-m">14</span>.0.0 <span class="tok-o">(</span>clang-1400.0.29.102<span class="tok-o">)]</span> on darwin
Type <span class="tok-s2">"help"</span>, <span class="tok-s2">"copyright"</span>, <span class="tok-s2">"credits"</span> or <span class="tok-s2">"license"</span> <span class="tok-k">for</span> more information.
>>> from repast4py import space</code></pre>
</div>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
The MPI compilation wrappers also need to be on the <code>PATH</code> for
the repast4py install.
</td>
</tr>
</table>
</div>
</div>
</div>
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