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<h1>Open MPI v5.0.8<a class="headerlink" href="#open-mpi-ompi-ver" title="Permalink to this heading"></a></h1>
<p><a class="reference external" href="https://www.open-mpi.org/">The Open MPI Project</a> is an open source
implementation of the <a class="reference external" href="https://www.mpi-forum.org/docs/">Message Passing Interface (MPI) specification</a> that is developed and maintained
by a consortium of academic, research, and industry partners. Open
MPI is therefore able to combine the expertise, technologies, and
resources from all across the High Performance Computing community in
order to build the best MPI library available. Open MPI offers
advantages for system and software vendors, application developers and
computer science researchers.</p>
</div>
<div class="section" id="documentation-locations">
<h1>Documentation locations<a class="headerlink" href="#documentation-locations" title="Permalink to this heading"></a></h1>
<p>Documentation for Open MPI can be found in the following locations:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 50%" />
<col style="width: 50%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Open MPI version</p></th>
<th class="head"><p>Documentation location</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>v5.0.0 and later</p></td>
<td><p>Web: <a class="reference external" href="https://docs.open-mpi.org/">https://docs.open-mpi.org/</a></p>
<p>Included in tarball: <code class="docutils literal notranslate"><span class="pre">docs/html/index.html</span></code></p>
<p>Built in source tree (if Sphinx available): <code class="docutils literal notranslate"><span class="pre">docs/_build/html/index.html</span></code></p>
<p>Installed: <code class="docutils literal notranslate"><span class="pre">$docdir/html/index.html</span></code></p>
<p>(which defaults to: <code class="docutils literal notranslate"><span class="pre">$prefix/share/doc/openmpi/html/index.html</span></code>)</p>
</td>
</tr>
<tr class="row-odd"><td><p>v4.1.x and earlier</p></td>
<td><p>See the <a class="reference external" href="https://www.open-mpi.org/faq/">legacy Open MPI FAQ</a>
and the README file in the source tarball.</p>
<p>For example:</p>
<ul class="simple">
<li><p><a class="reference external" href="https://github.com/open-mpi/ompi/blob/v4.1.x/README">v4.1.x README file</a></p></li>
<li><p><a class="reference external" href="https://github.com/open-mpi/ompi/blob/v4.0.x/README">v4.0.x README file</a></p></li>
</ul>
</td>
</tr>
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<h1>Release announcements<a class="headerlink" href="#release-announcements" title="Permalink to this heading"></a></h1>
<p>The best way to hear about new Open MPI releases is via the
<a class="reference external" href="https://lists.open-mpi.org/mailman/listinfo/announce">low-volume announcement mailing list</a>.</p>
<p>Additionally, if you are a downstream packager of Open MPI (e.g., you
package Open MPI for an operating system distribution), you may wish
to sign up for the <a class="reference external" href="https://lists.open-mpi.org/mailman/listinfo/ompi-packagers">low-volume packagers list</a>.</p>
</div>
<div class="section" id="table-of-contents">
<h1>Table of contents<a class="headerlink" href="#table-of-contents" title="Permalink to this heading"></a></h1>
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<li class="toctree-l1"><a class="reference internal" href="quickstart.html">1. Quick start</a></li>
<li class="toctree-l1"><a class="reference internal" href="getting-help.html">2. Getting help</a><ul>
<li class="toctree-l2"><a class="reference internal" href="getting-help.html#where-to-send">2.1. Where to send?</a></li>
<li class="toctree-l2"><a class="reference internal" href="getting-help.html#for-problems-building-or-installing-open-mpi">2.2. For problems building or installing Open MPI</a></li>
<li class="toctree-l2"><a class="reference internal" href="getting-help.html#for-problems-launching-mpi-or-openshmem-applications">2.3. For problems launching MPI or OpenSHMEM applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="getting-help.html#for-problems-running-mpi-or-openshmem-applications">2.4. For problems running MPI or OpenSHMEM applications</a></li>
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<li class="toctree-l1"><a class="reference internal" href="release-notes/index.html">3. Release notes</a><ul>
<li class="toctree-l2"><a class="reference internal" href="release-notes/changelog/index.html">3.1. Changelog</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/general.html">3.2. General notes</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/platform.html">3.3. Platform Notes</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/compilers.html">3.4. Compiler Notes</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/run-time.html">3.5. General Run-Time Support Notes</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/mpi.html">3.6. MPI Functionality and Features</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/openshmem.html">3.7. OpenSHMEM Functionality and Features</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/mpi-collectives.html">3.8. MPI Collectives</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/openshmem-collectives.html">3.9. OpenSHMEM Collectives</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/networks.html">3.10. Network Support</a></li>
<li class="toctree-l2"><a class="reference internal" href="release-notes/extensions.html">3.11. Open MPI Extensions</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="installing-open-mpi/index.html">4. Building and installing Open MPI</a><ul>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/quickstart.html">4.1. Quick start: Installing Open MPI</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/downloading.html">4.2. Downloading Open MPI</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/supported-systems.html">4.3. Supported Systems</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/definitions.html">4.4. Definitions</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/filesystem-requirements.html">4.5. Filesystem requirements</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/vpath-builds.html">4.6. VPATH builds</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/compilers-and-flags.html">4.7. Specifying compilers and flags</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/required-support-libraries.html">4.8. Required support libraries</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/configure-cli-options/index.html">4.9. <code class="docutils literal notranslate"><span class="pre">configure</span></code> command line options</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/configure-output-summary.html">4.10. <code class="docutils literal notranslate"><span class="pre">configure</span></code> output summary</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/make-targets.html">4.11. <code class="docutils literal notranslate"><span class="pre">make</span></code> targets</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/installation-location.html">4.12. Installation location</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/custom-components.html">4.13. Installing custom components</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/updating.html">4.14. Updating or upgrading an Open MPI installation</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/packagers.html">4.15. Advice for packagers</a></li>
<li class="toctree-l2"><a class="reference internal" href="installing-open-mpi/sysadmins.html">4.16. Advice for System Administrators</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="features/index.html">5. Open MPI-specific features</a><ul>
<li class="toctree-l2"><a class="reference internal" href="features/profiling.html">5.1. Open MPI profiling interface</a></li>
<li class="toctree-l2"><a class="reference internal" href="features/extensions.html">5.2. Open MPI extensions</a></li>
<li class="toctree-l2"><a class="reference internal" href="features/ulfm.html">5.3. User-Level Fault Mitigation (ULFM)</a></li>
<li class="toctree-l2"><a class="reference internal" href="features/java.html">5.4. Open MPI Java bindings</a></li>
</ul>
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<li class="toctree-l1"><a class="reference internal" href="validate.html">6. Validating your installation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="validate.html#checking-your-open-mpi-configuration">6.1. Checking your Open MPI configuration</a></li>
<li class="toctree-l2"><a class="reference internal" href="validate.html#testing-your-open-mpi-installation">6.2. Testing your Open MPI installation</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="version-numbering.html">7. Version numbers and compatibility</a><ul>
<li class="toctree-l2"><a class="reference internal" href="version-numbering.html#backward-compatibility">7.1. Backward Compatibility</a></li>
<li class="toctree-l2"><a class="reference internal" href="version-numbering.html#software-version-number">7.2. Software Version Number</a></li>
<li class="toctree-l2"><a class="reference internal" href="version-numbering.html#shared-library-version-number">7.3. Shared Library Version Number</a></li>
<li class="toctree-l2"><a class="reference internal" href="version-numbering.html#api-and-abi-compatibility">7.4. API and ABI Compatibility</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="mca.html">8. The Modular Component Architecture (MCA)</a><ul>
<li class="toctree-l2"><a class="reference internal" href="mca.html#terminology">8.1. Terminology</a></li>
<li class="toctree-l2"><a class="reference internal" href="mca.html#setting-mca-parameter-values">8.2. Setting MCA parameter values</a></li>
<li class="toctree-l2"><a class="reference internal" href="mca.html#displaying-mca-parameter-values">8.3. Displaying MCA parameter values</a></li>
<li class="toctree-l2"><a class="reference internal" href="mca.html#selecting-which-open-mpi-components-are-used-at-run-time">8.4. Selecting which Open MPI components are used at run time</a></li>
<li class="toctree-l2"><a class="reference internal" href="mca.html#common-mca-parameters">8.5. Common MCA parameters</a></li>
<li class="toctree-l2"><a class="reference internal" href="mca.html#mca-parameter-changes-between-open-mpi-4-x-and-5-x">8.6. MCA Parameter Changes Between Open MPI 4.x and 5.x</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="building-apps/index.html">9. Building MPI applications</a><ul>
<li class="toctree-l2"><a class="reference internal" href="building-apps/quickstart.html">9.1. Quick start: Building MPI applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="building-apps/customizing-wrappers.html">9.2. Customizing wrapper compiler behavior</a></li>
<li class="toctree-l2"><a class="reference internal" href="building-apps/extracting-wrapper-flags.html">9.3. Extracting flags from the wrapper compilers</a></li>
<li class="toctree-l2"><a class="reference internal" href="building-apps/abi-compatibility.html">9.4. ABI compatibility to previous versions of Open MPI</a></li>
<li class="toctree-l2"><a class="reference internal" href="building-apps/removed-mpi-constructs.html">9.5. Removed MPI constructs</a></li>
<li class="toctree-l2"><a class="reference internal" href="building-apps/deprecation-warnings.html">9.6. Deprecation warnings while compiling MPI applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="building-apps/building-static-apps.html">9.7. Building fully-static MPI applications</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="launching-apps/index.html">10. Launching MPI applications</a><ul>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/quickstart.html">10.1. Quick start: Launching MPI applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/prerequisites.html">10.2. Prerequisites</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/pmix-and-prrte.html">10.3. The role of PMIx and PRRTE</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/scheduling.html">10.4. Scheduling processes across hosts</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/localhost.html">10.5. Launching only on the local node</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/ssh.html">10.6. Launching with SSH</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/slurm.html">10.7. Launching with Slurm</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/lsf.html">10.8. Launching with LSF</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/tm.html">10.9. Launching with PBS / Torque</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/gridengine.html">10.10. Launching with Grid Engine</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/unusual.html">10.11. Unusual jobs</a></li>
<li class="toctree-l2"><a class="reference internal" href="launching-apps/troubleshooting.html">10.12. Troubleshooting</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="tuning-apps/index.html">11. Run-time operation and tuning MPI applications</a><ul>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/environment-var.html">11.1. Environment variables set for MPI applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/networking/index.html">11.2. Networking support</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/multithreaded.html">11.3. Running multi-threaded MPI applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/dynamic-loading.html">11.4. Dynamically loading <code class="docutils literal notranslate"><span class="pre">libmpi</span></code> at runtime</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/fork-system-popen.html">11.5. Calling fork(), system(), or popen() in MPI processes</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/fault-tolerance/index.html">11.6. Fault tolerance</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/large-clusters/index.html">11.7. Large Clusters</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/affinity.html">11.8. Processor and memory affinity</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/mpi-io/index.html">11.9. MPI-IO tuning options</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/coll-tuned.html">11.10. Tuning Collectives</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/benchmarking.html">11.11. Benchmarking Open MPI applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="tuning-apps/heterogeneity.html">11.12. Building heterogeneous MPI applications</a></li>
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<li class="toctree-l1"><a class="reference internal" href="app-debug/index.html">12. Debugging Open MPI Parallel Applications</a><ul>
<li class="toctree-l2"><a class="reference internal" href="app-debug/debug-tools.html">12.1. Parallel Debugging Tools</a></li>
<li class="toctree-l2"><a class="reference internal" href="app-debug/debug-options.html">12.2. Open MPI Runtime Debugging Options</a></li>
<li class="toctree-l2"><a class="reference internal" href="app-debug/serial-debug.html">12.3. Using Serial Debuggers to Debug Open MPI Applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="app-debug/parallel-debug.html">12.4. Using Parallel Debuggers to Debug Open MPI Applications</a></li>
<li class="toctree-l2"><a class="reference internal" href="app-debug/lost-output.html">12.5. Application Output Lost with Abnormal Termination</a></li>
<li class="toctree-l2"><a class="reference internal" href="app-debug/memchecker.html">12.6. Using Memchecker</a></li>
<li class="toctree-l2"><a class="reference internal" href="app-debug/valgrind.html">12.7. Using Valgrind to Find Open MPI Application Errors</a></li>
<li class="toctree-l2"><a class="reference internal" href="app-debug/mpir-tools.html">12.8. Using MPIR-based tools with Open MPI</a></li>
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<li class="toctree-l1"><a class="reference internal" href="developers/index.html">13. Developer’s guide</a><ul>
<li class="toctree-l2"><a class="reference internal" href="developers/prerequisites.html">13.1. Prerequisites</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/git-github.html">13.2. GitHub, Git, and related topics</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/compiler-pickyness.html">13.3. Compiler Pickyness by Default</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/autogen.html">13.4. Running <code class="docutils literal notranslate"><span class="pre">autogen.pl</span></code></a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/building-open-mpi.html">13.5. Building Open MPI</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/terminology.html">13.6. Open MPI terminology</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/source-code.html">13.7. Source code</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/frameworks.html">13.8. Internal frameworks</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/gnu-autotools.html">13.9. Manually installing the GNU Autootools</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/sphinx.html">13.10. Installing and running Sphinx (building the Open MPI docs)</a></li>
<li class="toctree-l2"><a class="reference internal" href="developers/rst-for-markdown-expats.html">13.11. ReStructured Text for those who know Markdown</a></li>
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<li class="toctree-l1"><a class="reference internal" href="contributing.html">14. Contributing to Open MPI</a><ul>
<li class="toctree-l2"><a class="reference internal" href="contributing.html#open-source-contributions">14.1. Open source contributions</a></li>
<li class="toctree-l2"><a class="reference internal" href="contributing.html#closed-source-contributions">14.2. Closed source contributions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="license/index.html">15. License</a><ul>
<li class="toctree-l2"><a class="reference internal" href="license/index.html#open-mpi-license">15.1. Open MPI license</a></li>
<li class="toctree-l2"><a class="reference internal" href="license/index.html#additional-licenses">15.2. Additional licenses</a></li>
<li class="toctree-l2"><a class="reference internal" href="license/index.html#redistributed-code">15.3. Redistributed code</a></li>
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<li class="toctree-l1"><a class="reference internal" href="history.html">16. History of Open MPI</a><ul>
<li class="toctree-l2"><a class="reference internal" href="history.html#goals-of-the-open-mpi-project">16.1. Goals of the Open MPI Project</a></li>
<li class="toctree-l2"><a class="reference internal" href="history.html#community">16.2. Community</a></li>
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<li class="toctree-l1"><a class="reference internal" href="man-openmpi/index.html">17. Open MPI manual pages</a><ul>
<li class="toctree-l2"><a class="reference internal" href="man-openmpi/man1/index.html">17.1. Commands (section 1)</a></li>
<li class="toctree-l2"><a class="reference internal" href="man-openmpi/man3/index.html">17.2. MPI API manual pages (section 3)</a></li>
<li class="toctree-l2"><a class="reference internal" href="man-openmpi/man7/index.html">17.3. General information manual pages (section 7)</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="man-openshmem/index.html">18. OpenSHMEM manual pages</a><ul>
<li class="toctree-l2"><a class="reference internal" href="man-openshmem/man1/index.html">18.1. Commands (section 1)</a></li>
<li class="toctree-l2"><a class="reference internal" href="man-openshmem/man3/index.html">18.2. OpenSHMEM API manual pages (section 3)</a></li>
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<div class="section" id="contributors">
<h1>Contributors<a class="headerlink" href="#contributors" title="Permalink to this heading"></a></h1>
<p>A gigantic “thank you!” to all of our contributors:</p>
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