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<h1><span class="section-number">10.8. </span>Launching with LSF<a class="headerlink" href="#launching-with-lsf" title="Permalink to this heading"></a></h1>
<p>Open MPI supports the LSF resource manager.</p>
<div class="section" id="verify-lsf-support">
<h2><span class="section-number">10.8.1. </span>Verify LSF support<a class="headerlink" href="#verify-lsf-support" title="Permalink to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">prte_info</span></code> command can be used to determine whether or not an
installed Open MPI includes LSF support:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>shell$ prte_info | grep lsf
</pre></div>
</div>
<p>If the Open MPI installation includes support for LSF, you
should see a line similar to that below. Note the MCA version
information varies depending on which version of Open MPI is
installed.</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>MCA ras: lsf (MCA v2.1.0, API v2.0.0, Component v3.0.0)
</pre></div>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>PRRTE is the software layer that provides run-time
environment support to Open MPI. Open MPI typically hides most
PMIx and PRRTE details from the end user, but this is one place
that Open MPI is unable to hide the fact that PRRTE provides this
functionality, not Open MPI. Hence, users need to use the
<code class="docutils literal notranslate"><span class="pre">prte_info</span></code> command to check for LSF support (not
<code class="docutils literal notranslate"><span class="pre">ompi_info</span></code>).</p>
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<div class="section" id="launching">
<h2><span class="section-number">10.8.2. </span>Launching<a class="headerlink" href="#launching" title="Permalink to this heading"></a></h2>
<p>When properly configured, Open MPI obtains both the list of hosts and
how many processes to start on each host from LSF directly. Hence, it
is unnecessary to specify the <code class="docutils literal notranslate"><span class="pre">--hostfile</span></code>, <code class="docutils literal notranslate"><span class="pre">--host</span></code>, or <code class="docutils literal notranslate"><span class="pre">-n</span></code>
options to <code class="docutils literal notranslate"><span class="pre">mpirun</span></code>. Open MPI will use LSF-native mechanisms
to launch and kill processes (<code class="docutils literal notranslate"><span class="pre">ssh</span></code> is not required).</p>
<p>For example:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="c1"># Allocate a job using 4 nodes with 2 processors per node and run the job on the nodes allocated by LSF</span>
shell$<span class="w"> </span>bsub<span class="w"> </span>-n<span class="w"> </span><span class="m">8</span><span class="w"> </span>-R<span class="w"> </span><span class="s2">"span[ptile=2]"</span><span class="w"> </span><span class="s2">"mpirun mpi-hello-world"</span>
</pre></div>
</div>
<p>This will run the MPI processes on the nodes that were allocated by
LSF. Or, if submitting a script:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>shell$<span class="w"> </span>cat<span class="w"> </span>my_script.sh
<span class="c1">#!/bin/sh</span>
mpirun<span class="w"> </span>mpi-hello-world
shell$<span class="w"> </span>bsub<span class="w"> </span>-n<span class="w"> </span><span class="m">8</span><span class="w"> </span>-R<span class="w"> </span><span class="s2">"span[ptile=2]"</span><span class="w"> </span><<span class="w"> </span>my_script.sh
</pre></div>
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