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Lumi-supercomputer · Oct 30, 2024 · 31e49a0 · 31e49a0
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diff --git a/4day-20241028/extra_3_05_Cray_MPI_on_Slingshot/index.html b/4day-20241028/extra_3_05_Cray_MPI_on_Slingshot/index.html
@@ -2926,7 +2926,14 @@ <h1 id="mpi-topics-on-the-hpe-cray-ex-supercomputer">MPI Topics on the HPE Cray
 
 <p>These materials can only be distributed to actual users of LUMI (active user account).</p>
 <h2 id="qa">Q&amp;A<a class="headerlink" href="#qa" title="Permanent link">&para;</a></h2>
-<p>/</p>
+<ol>
+<li>
+<p>For the 2D neighbour exchange example on the slides, isn't it easier to let <code>MPI_Cart_create()</code> deal with the reordering and just use whatever it returns? And then ask the MPI_Cart_shift() for neighbours?</p>
+<ul>
+<li>Cart may not create an optimal solution. It may not be aware about things like node-layout and NUMA domains.</li>
+</ul>
+</li>
+</ol>
 
 
 

diff --git a/search/search_index.json b/search/search_index.json