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<h1><span class="section-number">12.4. </span>Using Parallel Debuggers to Debug Open MPI Applications<a class="headerlink" href="#using-parallel-debuggers-to-debug-open-mpi-applications" title="Permalink to this heading"></a></h1>
<div class="section" id="debugging-with-totalview">
<h2><span class="section-number">12.4.1. </span>Debugging with TotalView<a class="headerlink" href="#debugging-with-totalview" title="Permalink to this heading"></a></h2>
<p>Debugging MPI applications has changed with different releases of
TotalView and Open MPI; it is best to consult TotalView’s
documentation for how you should debug Open MPI applications with
TotalView.</p>
<p>Starting with Open MPI v5.0.0, debugging with Totalview requires the
use of the MPIR shim module to attach to MPI processes. See the
<a class="reference internal" href="mpir-tools.html#using-mpir-based-tools-label"><span class="std std-ref">using MPIR-based tools with Open MPI section</span></a> for instructions on building and
installing the MPIR shim module.</p>
<p>Once TotalView is attached to Open MPI processes, it can also view
Open MPI’s message queues (for some transports), which can aid in
debugging.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The integration of Open MPI message queue support is
problematic with 64-bit versions of TotalView prior to v8.3:</p>
<ul class="simple">
<li><p>The message queues view will be truncated.</p></li>
<li><p>Both the communicators and requests lists will be incomplete.</p></li>
<li><p>Both the communicators and requests lists may be filled with wrong
values (such as an <code class="docutils literal notranslate"><span class="pre">MPI_Send</span></code> to the destination
<code class="docutils literal notranslate"><span class="pre">MPI_ANY_SOURCE</span></code>).</p></li>
</ul>
<p>There are two workarounds:</p>
<ul class="simple">
<li><p>Use a 32-bit version of TotalView</p></li>
<li><p>Upgrade to TotalView v8.3 or later</p></li>
</ul>
</div>
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<div class="section" id="debugging-with-ddt">
<h2><span class="section-number">12.4.2. </span>Debugging with DDT<a class="headerlink" href="#debugging-with-ddt" title="Permalink to this heading"></a></h2>
<p>Debugging MPI application with DDT has changed with different releases
of DDT and Open MPI; it is best to consult DDT’s documentation for how
you should debug Open MPI applications with DDT.</p>
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