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<title>6. Validating your installation — Open MPI 5.0.8 documentation</title>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">6. Validating your installation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#checking-your-open-mpi-configuration">6.1. Checking your Open MPI configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="#testing-your-open-mpi-installation">6.2. Testing your Open MPI installation</a></li>
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<h1><span class="section-number">6. </span>Validating your installation<a class="headerlink" href="#validating-your-installation" title="Permalink to this heading"></a></h1>
<div class="section" id="checking-your-open-mpi-configuration">
<h2><span class="section-number">6.1. </span>Checking your Open MPI configuration<a class="headerlink" href="#checking-your-open-mpi-configuration" title="Permalink to this heading"></a></h2>
<p>The <a class="reference internal" href="man-openmpi/man1/ompi_info.1.html#man1-ompi-info"><span class="std std-ref">ompi_info(1)</span></a> command can be used to check
the status of your Open MPI installation (located in
<code class="docutils literal notranslate"><span class="pre">$prefix/bin/ompi_info</span></code>). Running it with no arguments provides a
summary of information about your Open MPI installation.</p>
<p>Note that the <a class="reference internal" href="man-openmpi/man1/ompi_info.1.html#man1-ompi-info"><span class="std std-ref">ompi_info(1)</span></a> command is
extremely helpful in determining which components are installed as
well as listing all the run-time settable parameters that are
available in each component (as well as their default values).</p>
<p>The following <a class="reference internal" href="man-openmpi/man1/ompi_info.1.html#man1-ompi-info"><span class="std std-ref">ompi_info(1)</span></a> options may be
helpful:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">--all</span></code>: Show a <em>lot</em> of information about your Open MPI
installation.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--parsable</span></code>: Display all the information in a machine-parsable
format.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--param</span> <span class="pre">FRAMEWORK</span> <span class="pre">COMPONENT</span></code>:
A <code class="docutils literal notranslate"><span class="pre">FRAMEWORK</span></code> value of <code class="docutils literal notranslate"><span class="pre">all</span></code> and a <code class="docutils literal notranslate"><span class="pre">COMPONENT</span></code> value of <code class="docutils literal notranslate"><span class="pre">all</span></code> will
show all parameters to all components. Otherwise, the parameters of
all the components in a specific framework, or just the parameters
of a specific component can be displayed by using an appropriate
FRAMEWORK and/or COMPONENT name.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">--level</span> <span class="pre">LEVEL</span></code>:
By default, <code class="docutils literal notranslate"><span class="pre">ompi_info</span></code> only shows “Level 1” MCA parameters —
parameters that can affect whether MPI processes can run
successfully or not (e.g., determining which network interfaces to
use). The <code class="docutils literal notranslate"><span class="pre">--level</span></code> option will display all MCA parameters from
level 1 to <code class="docutils literal notranslate"><span class="pre">LEVEL</span></code> (the max <code class="docutils literal notranslate"><span class="pre">LEVEL</span></code> value is 9). Use <code class="docutils literal notranslate"><span class="pre">ompi_info</span>
<span class="pre">--param</span> <span class="pre">FRAMEWORK</span> <span class="pre">COMPONENT</span> <span class="pre">--level</span> <span class="pre">9</span></code> to see <em>all</em> MCA parameters
for a given component. See “The Modular Component Architecture
(MCA)” section, below, for a fuller explanation.</p></li>
</ul>
<p>Changing the values of these MCA parameters is explained in the
<a class="reference internal" href="mca.html#label-running-setting-mca-param-values"><span class="std std-ref">Tuning section</span></a>.</p>
</div>
<div class="section" id="testing-your-open-mpi-installation">
<h2><span class="section-number">6.2. </span>Testing your Open MPI installation<a class="headerlink" href="#testing-your-open-mpi-installation" title="Permalink to this heading"></a></h2>
<p>When verifying a new Open MPI installation, we recommend running the
following tests in order (the tests build upon each other):</p>
<ol class="arabic simple">
<li><p>Use <a class="reference internal" href="man-openmpi/man1/mpirun.1.html#man1-mpirun"><span class="std std-ref">mpirun(1)</span></a> to launch a non-MPI program
(e.g., <code class="docutils literal notranslate"><span class="pre">hostname</span></code> or <code class="docutils literal notranslate"><span class="pre">uptime</span></code>) across multiple nodes.</p></li>
<li><p>Use <a class="reference internal" href="man-openmpi/man1/mpirun.1.html#man1-mpirun"><span class="std std-ref">mpirun(1)</span></a> to launch a trivial MPI program
that does no MPI communication (e.g., the <code class="docutils literal notranslate"><span class="pre">hello_c</span></code> program in
the <code class="docutils literal notranslate"><span class="pre">examples/</span></code> directory in the Open MPI distribution).</p></li>
<li><p>Use <a class="reference internal" href="man-openmpi/man1/mpirun.1.html#man1-mpirun"><span class="std std-ref">mpirun(1)</span></a> to launch a trivial MPI program
that sends and receives a few MPI messages (e.g., the <code class="docutils literal notranslate"><span class="pre">ring_c</span></code>
program in the <code class="docutils literal notranslate"><span class="pre">examples/</span></code> directory in the Open MPI
distribution).</p></li>
<li><p>Use <a class="reference internal" href="man-openshmem/man1/oshrun.1.html#man1-oshrun"><span class="std std-ref">oshrun(1)</span></a> to launch a non-OpenSHMEM
program across multiple nodes.</p></li>
<li><p>Use <a class="reference internal" href="man-openshmem/man1/oshrun.1.html#man1-oshrun"><span class="std std-ref">oshrun(1)</span></a> to launch a trivial MPI program
that does no OpenSHMEM communication (e.g., <code class="docutils literal notranslate"><span class="pre">hello_shmem.c</span></code>
program in the <code class="docutils literal notranslate"><span class="pre">examples/</span></code> directory in the Open MPI
distribution.)</p></li>
<li><p>Use <a class="reference internal" href="man-openshmem/man1/oshrun.1.html#man1-oshrun"><span class="std std-ref">oshrun</span></a> to launch a trivial OpenSHMEM
program that puts and gets a few messages (e.g., the
<code class="docutils literal notranslate"><span class="pre">ring_shmem.c</span></code> in the <code class="docutils literal notranslate"><span class="pre">examples/</span></code> directory in the Open MPI
distribution.)</p></li>
</ol>
<p>If you can run all of these tests successfully, that is a good
indication that Open MPI built and installed properly.</p>
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