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<li class="toctree-l1 current"><a class="current reference internal" href="#">10. Launching MPI applications</a><ul>
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<span id="label-running-mpi-applications"></span><h1><span class="section-number">10. </span>Launching MPI applications<a class="headerlink" href="#launching-mpi-applications" title="Permalink to this heading"></a></h1>
<p>Open MPI can launch MPI processes in a wide variety of environments,
but they can generally be broken down into two categories:</p>
<ol class="arabic simple">
<li><p>Scheduled environments: these are systems where a resource manager
and/or scheduler are used to control access to the compute nodes.
Popular resource managers include Slurm, PBS/Pro/Torque, and LSF.</p></li>
<li><p>Non-scheduled environments: these are systems where resource
managers are not used. Launches are typically local (e.g., on a
single laptop or workstation) or via <code class="docutils literal notranslate"><span class="pre">ssh</span></code> (e.g., across a small
number of nodes).</p></li>
</ol>
<p>Similar to many MPI implementations, Open MPI provides the commands
<a class="reference internal" href="../man-openmpi/man1/mpirun.1.html#man1-mpirun"><span class="std std-ref">mpirun(1)</span></a> and <a class="reference internal" href="../man-openmpi/man1/mpirun.1.html#man1-mpiexec"><span class="std std-ref">mpiexec(1)</span></a> to
launch MPI jobs. This section deals with using these commands.</p>
<p>Note, however, that in Open MPI, <a class="reference internal" href="../man-openmpi/man1/mpirun.1.html#man1-mpirun"><span class="std std-ref">mpirun(1)</span></a> and
<a class="reference internal" href="../man-openmpi/man1/mpirun.1.html#man1-mpiexec"><span class="std std-ref">mpiexec(1)</span></a> are exactly identical. Specifically,
they are symbolic links to a common back-end launcher command.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The name of the back-end launcher command has changed over
time (it used to be <code class="docutils literal notranslate"><span class="pre">orterun</span></code>, it is now <code class="docutils literal notranslate"><span class="pre">prte</span></code>). This
back-end name is largely irrelevant to the user.</p>
</div>
<p>The rest of this section usually refers only to <a class="reference internal" href="../man-openmpi/man1/mpirun.1.html#man1-mpirun"><span class="std std-ref">mpirun(1)</span></a>, even though the same discussions also apply to
<a class="reference internal" href="../man-openmpi/man1/mpirun.1.html#man1-mpiexec"><span class="std std-ref">mpiexec(1)</span></a> (because they are both, in fact, the
same command).</p>
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<li class="toctree-l1"><a class="reference internal" href="prerequisites.html">10.2. Prerequisites</a></li>
<li class="toctree-l1"><a class="reference internal" href="pmix-and-prrte.html">10.3. The role of PMIx and PRRTE</a></li>
<li class="toctree-l1"><a class="reference internal" href="scheduling.html">10.4. Scheduling processes across hosts</a></li>
<li class="toctree-l1"><a class="reference internal" href="localhost.html">10.5. Launching only on the local node</a></li>
<li class="toctree-l1"><a class="reference internal" href="ssh.html">10.6. Launching with SSH</a></li>
<li class="toctree-l1"><a class="reference internal" href="slurm.html">10.7. Launching with Slurm</a></li>
<li class="toctree-l1"><a class="reference internal" href="lsf.html">10.8. Launching with LSF</a></li>
<li class="toctree-l1"><a class="reference internal" href="tm.html">10.9. Launching with PBS / Torque</a></li>
<li class="toctree-l1"><a class="reference internal" href="gridengine.html">10.10. Launching with Grid Engine</a></li>
<li class="toctree-l1"><a class="reference internal" href="unusual.html">10.11. Unusual jobs</a></li>
<li class="toctree-l1"><a class="reference internal" href="troubleshooting.html">10.12. Troubleshooting</a></li>
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