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hi Matt, On 13/03/24 12: 46 pm, Matthew Knepley wrote: Thanks for finding this. This was indeed rewritten because the old algorithm was too expensive at large sizes/parallelism. The function where this breaks in DMPlexStratifyMigrationSF() in
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<p>hi Matt,<br>
</p>
<div class="moz-cite-prefix">On 13/03/24 12:46 pm, Matthew Knepley
wrote:<br>
</div>
<blockquote type="cite" cite="mid:CAMYG4GmOqNBXxdziwNbDQSMy86YUgQVCXj_a3FSNH5Gy+SG_3Q@mail.gmail.com">
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<div class="gmail_quote"><br>
<div>Thanks for finding this. This was indeed rewritten
because the old algorithm was too expensive at large
sizes/parallelism. The function where this breaks
in DMPlexStratifyMigrationSF() in plexdistribute.c. The
problem is here:</div>
<div><br>
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<div> <a href="https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/blob/main/src/dm/impls/plex/plexdistribute.c?ref_type=heads*L915__;Iw!!G_uCfscf7eWS!f3lT5aerjhKEOw0N2YLLmFuaxSTDqtBwuLRh7TwVg3NmCzfj71zSzjB-mXM7zhAxAGZnFlSTR-g_8R_1diIpZ-hCHoCWS8c$" moz-do-not-send="true">https://gitlab.com/petsc/petsc/-/blob/main/src/dm/impls/plex/plexdistribute.c?ref_type=heads#L915</a></div>
<div><br>
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<div>I treat DM_POLYTOPE_INTERIOR_GHOST as a cell no matter
what. We need to assign the interior vertices, faces, and
edges types that will give back the right dimension.
Vertices are easy, they should just be type POINT. I can
understand not wanting to use SEGMENT or QUAD for the
interior edge and face because they do not have full cones.
However, I think nothing will break (except explicit checks,
which will not work anyway) if you give them types SEGMENT
and QUAD. Is this easy to try?</div>
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</blockquote>
<p>Great, I just tried that and it does appear to work. I had
thought there was a reason I'd set those types to interior ghost,
but it seems to be ok just making them point, segment and
quadrilateral.</p>
<p>It now also works even without the modification you just made to
avoid trouble with the depth label. So that was probably a red
herring after all.</p>
<p>Thanks!</p>
<p>- Adrian<br>
</p>
<pre class="moz-signature" cols="72">--
Dr Adrian Croucher
Senior Research Fellow
Department of Engineering Science
Waipapa Taumata Rau / University of Auckland, New Zealand
email: <a class="moz-txt-link-abbreviated" href="mailto:a.croucher@auckland.ac.nz">a.croucher@auckland.ac.nz</a>
tel: +64 (0)9 923 4611</pre>
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