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<h1><span class="section-number">11.6.1. </span>Supported fault tolerance techniques<a class="headerlink" href="#supported-fault-tolerance-techniques" title="Permalink to this heading"></a></h1>
<p>Open MPI is a vehicle for research in fault tolerance and over the years
provided support for a wide range of resilience techniques:</p>
<ul>
<li><p>Currently supported</p>
<blockquote>
<div><ul class="simple">
<li><p>User Level Fault Mitigation techniques similar to those defined
in the context of the MPI Forum (this is the closest match when
migrating from FT-MPI); <a class="reference internal" href="../../features/ulfm.html#ulfm-label"><span class="std std-ref">see its documentation section</span></a>.</p></li>
</ul>
</div></blockquote>
</li>
<li><p>Only for research / non-production usage</p>
<blockquote>
<div><ul class="simple">
<li><p>Message logging techniques. Similar to those implemented in
MPICH-V.</p></li>
</ul>
</div></blockquote>
</li>
<li><p>Deprecated / no longer available</p>
<blockquote>
<div><ul class="simple">
<li><p>Coordinated and uncoordinated process checkpoint and
restart. Similar to those implemented in LAM/MPI and MPICH-V,
respectively.</p></li>
<li><p>Data Reliability and network fault tolerance. Similar to those
implemented in LA-MPI.</p></li>
</ul>
</div></blockquote>
</li>
</ul>
<div class="section" id="current-fault-tolerance-development">
<h2><span class="section-number">11.6.1.1. </span>Current fault tolerance development<a class="headerlink" href="#current-fault-tolerance-development" title="Permalink to this heading"></a></h2>
<p>The only active work in resilience in Open MPI targets the User Level Fault
Mitigation (ULFM) approach, a technique discussed in the context of the MPI
standardization body.</p>
<p>For information on the Fault Tolerant MPI prototype in Open MPI see the
links below:</p>
<ul class="simple">
<li><p><a class="reference internal" href="../../features/ulfm.html#ulfm-label"><span class="std std-ref">Open MPI’s ULFM documentation section</span></a></p></li>
<li><p><a class="reference external" href="https://github.com/mpiwg-ft/ft-issues/wiki">MPI Forum’s Fault Tolerance Working Group</a></p></li>
<li><p><a class="reference external" href="https://fault-tolerance.org/">Information, examples, and support</a></p></li>
</ul>
<p>Support for other types of resilience (e.g., <a class="reference internal" href="data-reliability.html#ft-data-reliability-label"><span class="std std-ref">data reliability</span></a>,
<a class="reference internal" href="checkpoint-restart.html#ft-checkpoint-restart-label"><span class="std std-ref">checkpoint</span></a>) has been deprecated over the
years due to lack of adoption and lack of maintenance. If you are interested
in doing some archeological work, traces are still available on the main
repository.</p>
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