<html>#2436: simfactory's and ibruns default binds multiple threads to the same core on Comet
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<tr><td style='text-align:right'> Reporter:</td><td>Roland Haas</td></tr>
<tr><td style='text-align:right'> Status:</td><td>new</td></tr>
<tr><td style='text-align:right'>Milestone:</td><td></td></tr>
<tr><td style='text-align:right'> Version:</td><td></td></tr>
<tr><td style='text-align:right'> Type:</td><td>bug</td></tr>
<tr><td style='text-align:right'> Priority:</td><td>major</td></tr>
<tr><td style='text-align:right'>Component:</td><td>SimFactory</td></tr>
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<p>Running with Simfactory’s default of 6 threads per rank and without SystemTopology gives bad core binding.</p>
<p>Ibrun (before SystemTopology) outputs</p>
<div class="codehilite"><pre><span></span><span class="n">IBRUN</span><span class="o">:</span> <span class="n">Even</span> <span class="n">number</span> <span class="n">of</span> <span class="n">ranks</span> <span class="n">per</span> <span class="n">node</span> <span class="o">(</span><span class="mi">4</span><span class="o">)--</span><span class="n">hacking</span> <span class="n">nodefile</span><span class="o">...</span>
<span class="n">IBRUN</span><span class="o">:</span> <span class="n">Running</span> <span class="n">on</span> <span class="mi">3</span> <span class="n">unique</span> <span class="n">nodes</span>
<span class="n">IBRUN</span><span class="o">:</span> <span class="n">Will</span> <span class="n">place</span> <span class="mi">4</span> <span class="n">ranks</span> <span class="n">on</span> <span class="n">comet</span><span class="o">-</span><span class="mi">19</span><span class="o">-</span><span class="mi">36</span> <span class="k">with</span> <span class="mi">6</span> <span class="n">threads</span> <span class="k">each</span>
<span class="n">IBRUN</span><span class="o">:</span> <span class="n">Will</span> <span class="n">place</span> <span class="mi">4</span> <span class="n">ranks</span> <span class="n">on</span> <span class="n">comet</span><span class="o">-</span><span class="mi">19</span><span class="o">-</span><span class="mi">40</span> <span class="k">with</span> <span class="mi">6</span> <span class="n">threads</span> <span class="k">each</span>
<span class="n">IBRUN</span><span class="o">:</span> <span class="n">Will</span> <span class="n">place</span> <span class="mi">4</span> <span class="n">ranks</span> <span class="n">on</span> <span class="n">comet</span><span class="o">-</span><span class="mi">25</span><span class="o">-</span><span class="mi">64</span> <span class="k">with</span> <span class="mi">6</span> <span class="n">threads</sp
<p>--<br/>
Ticket URL: <a href='https://bitbucket.org/einsteintoolkit/tickets/issues/2436/simfactorys-and-ibruns-default-binds'>https://bitbucket.org/einsteintoolkit/tickets/issues/2436/simfactorys-and-ibruns-default-binds</a></p>
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