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<h1><span class="section-number">8.7. </span>Diagnostics<a class="headerlink" href="#diagnostics" title="Permalink to this heading"></a></h1>
<p>PRRTE provides various diagnostic reports that aid the user in
verifying and tuning the mapping/ranking/binding for a specific job.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">:REPORT</span></code> qualifier to the <code class="docutils literal notranslate"><span class="pre">--bind-to</span></code> command line option can
be used to report process bindings.</p>
<p>As an example, consider a node with:</p>
<ul class="simple">
<li><p>2 processor packages,</p></li>
<li><p>4 cores per package, and</p></li>
<li><p>8 hardware threads per core.</p></li>
</ul>
<p>In each of the examples below the binding is reported in a human readable
format.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ prun --np 4 --map-by core --bind-to core:REPORT ./a.out
[node01:103137] MCW rank 0 bound to package[0][core:0]
[node01:103137] MCW rank 1 bound to package[0][core:1]
[node01:103137] MCW rank 2 bound to package[0][core:2]
[node01:103137] MCW rank 3 bound to package[0][core:3]
</pre></div>
</div>
<p>In the example above, processes are bound to successive cores on the
first package.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ prun --np 4 --map-by package --bind-to package:REPORT ./a.out
[node01:103115] MCW rank 0 bound to package[0][core:0-9]
[node01:103115] MCW rank 1 bound to package[1][core:10-19]
[node01:103115] MCW rank 2 bound to package[0][core:0-9]
[node01:103115] MCW rank 3 bound to package[1][core:10-19]
</pre></div>
</div>
<p>In the example above, processes are bound to all cores on successive
packages in a round-robin fashion.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ prun --np 4 --map-by package:PE=2 --bind-to core:REPORT ./a.out
[node01:103328] MCW rank 0 bound to package[0][core:0-1]
[node01:103328] MCW rank 1 bound to package[1][core:10-11]
[node01:103328] MCW rank 2 bound to package[0][core:2-3]
[node01:103328] MCW rank 3 bound to package[1][core:12-13]
</pre></div>
</div>
<p>The example above shows us that 2 cores have been bound per process.
The <code class="docutils literal notranslate"><span class="pre">:PE=2</span></code> qualifier states that 2 CPUs underneath the package
(which would be cores in this case) are mapped to each process.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ prun --np 4 --map-by core:PE=2:HWTCPUS --bind-to :REPORT hostname
[node01:103506] MCW rank 0 bound to package[0][hwt:0-1]
[node01:103506] MCW rank 1 bound to package[0][hwt:8-9]
[node01:103506] MCW rank 2 bound to package[0][hwt:16-17]
[node01:103506] MCW rank 3 bound to package[0][hwt:24-25]
</pre></div>
</div>
<p>The example above shows us that 2 hardware threads have been bound per
process. In this case <code class="docutils literal notranslate"><span class="pre">prun</span></code> is directing the DVM to map by
hardware threads since we used the <code class="docutils literal notranslate"><span class="pre">:HWTCPUS</span></code> qualifier. Without
that qualifier this command would return an error since by default the
DVM will not map to resources smaller than a core. The <code class="docutils literal notranslate"><span class="pre">:PE=2</span></code>
qualifier states that 2 processing elements underneath the core (which
would be hardware threads in this case) are mapped to each process.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ prun --np 4 --bind-to none:REPORT hostname
[node01:107126] MCW rank 0 is not bound (or bound to all available processors)
[node01:107126] MCW rank 1 is not bound (or bound to all available processors)
[node01:107126] MCW rank 2 is not bound (or bound to all available processors)
[node01:107126] MCW rank 3 is not bound (or bound to all available processors)
</pre></div>
</div>
<p>Binding is turned off in the above example, as reported.</p>
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