<div dir="ltr">
<span></span>
<p style="line-height:100%;margin-bottom:0in;background:transparent">
Present: Roland, Swapnil, Allen, Lucas, Liwei, Jay, Steve</p>
<p style="line-height:100%;margin-bottom:0in;background:transparent"><br>
</p>
<p style="line-height:100%;margin-bottom:0in;background:transparent">Performance Issues:
</p>
<ul><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Liwei + Jay
observed CarpetX being slower than Carpet in certain simulations
when using CPUs (hydro + spacetime + 14 AMR levels).
</p></li><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Swapnil
observed similar speeds between Carpet(X) with CarpetX using much
fewer nodes.
</p></li><li><p style="line-height:100%;margin-bottom:0in;background:transparent">For GPUs, Swapnil
recommends: less boxes (equal to # of GPUs, perhaps less) controlled
via max_grid_size for each level, set AMReX “refine_grid_layout” to “no”.</p></li><li><p style="line-height:100%;margin-bottom:0in;background:transparent">For CPUs, Roland
recommends: port CarpetX Z4c to Carpet, or run without spacetime, or
run wavetoy to isolate effects of science code vs infrastructure; try changing tiling parameters.<br></p></li><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Compare w/
AthenaK: they advertise 98% efficient weak scaling. Due to
infrastructure, # ghost zones, etc.? Potential apples to apples GPU
code comparison in the future.</p></li></ul>
<p style="line-height:100%;margin-bottom:0in;background:transparent"><br>
</p>
<p style="line-height:100%;margin-bottom:0in;background:transparent">Updates:</p>
<p style="line-height:100%;margin-bottom:0in;background:transparent"><br>
</p>
<ul><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Steve</p></li></ul>
<ul><ul><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Wrote
introduction to subcycling paper.</p></li></ul><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Lucas</p></li></ul>
<ul><ul><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Multipatch
tests working, looking towards evolving black holes.</p></li></ul><li><p style="line-height:100%;margin-bottom:0in;background:transparent">Allen</p></li></ul>
<ul><ul><li><p style="line-height:100%;margin-bottom:0in;background:transparent">MeudonBNSX
working without OMP, check if array index is accurate, or put
problematic code inside omp critical.</p></li></ul></ul>
</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, Jan 9, 2025 at 1:00 PM <<a href="mailto:carpetx-developers-request@einsteintoolkit.org">carpetx-developers-request@einsteintoolkit.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send Carpetx-developers mailing list submissions to<br>
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Message: 1<br>
Date: Wed, 08 Jan 2025 16:08:01 -0600<br>
From: <a href="mailto:rhaas@illinois.edu" target="_blank">rhaas@illinois.edu</a><br>
To: <a href="mailto:carpetx-developers@lists.einsteintoolkit.org" target="_blank">carpetx-developers@lists.einsteintoolkit.org</a>, <a href="mailto:rhaas80@gmail.com" target="_blank">rhaas80@gmail.com</a><br>
Subject: [Carpetx-developers] Weekly call at 4pm Thursday Eastern time<br>
Message-ID: <<a href="mailto:E1tVeDZ-00000005alV-2RS5@ekohaes8.ncsa.illinois.edu" target="_blank">E1tVeDZ-00000005alV-2RS5@ekohaes8.ncsa.illinois.edu</a>><br>
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End of Carpetx-developers Digest, Vol 37, Issue 2<br>
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</blockquote></div>