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<h1><span class="section-number">11.2.5. </span>iWARP Support<a class="headerlink" href="#iwarp-support" title="Permalink to this heading"></a></h1>
<p>Open MPI’s support for iWARP devices has changed over time.</p>
<p>In the Open MPI v5.0.x series, iWARP devices are
supported via the OFI (<code class="docutils literal notranslate"><span class="pre">ofi</span></code>) MTL via the CM (<code class="docutils literal notranslate"><span class="pre">cm</span></code>) PML.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Prior versions of Open MPI supported iWARP devies via the
<code class="docutils literal notranslate"><span class="pre">openib</span></code> BTL. Open MPI v5.0.x no longer includes
the <code class="docutils literal notranslate"><span class="pre">openib</span></code> BTL.</p>
</div>
<p>Specifically, iWARP support is provides through the <code class="docutils literal notranslate"><span class="pre">rxm</span></code> provider
of the OpenFabrics Interfaces library <code class="docutils literal notranslate"><span class="pre">libfabric</span></code>. There is
software emulation involved in the MPI support of iWARP devices (and
therefore at least some level of performance degradation), but the
current iWARP vendors have chosen not to provide a higher-performance
option.</p>
<div class="admonition important">
<p class="admonition-title">Important</p>
<p>iWARP support is not well tested or maintained in Open
MPI. The Open MPI community would love to have a
maintainer who can develop and provide support for
iWARP devices over time.</p>
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