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Dear Matthew, Thank you for answer me out of office hours and for the suggestion. If I interpret it correctly, your point is using the background mesh halo to identify and create ghosts particles in the overlapping region using DMSwarmMigrate().
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Dear Matthew,
<div><br>
</div>
<div>Thank you for answer me out of office hours and for the suggestion. If I interpret it correctly, your point is using the background mesh halo to identify and create ghosts particles in the overlapping region using DMSwarmMigrate(). </div>
<div><br>
</div>
<div>Then two questions hits me: </div>
<div>
<ul class="MailOutline">
<li>If I change a variable in the “real” particle (say the position), it should be updated in the replicas on the overlapped regions, right? This sort of communicator is included in <span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">DMSwarmMigrate()?</span></li><li><font color="#000000">The function </font><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">DMSwarmCreateLocalVectorFromField() does </span><font color="#000000">not include extra space for ghost particles. Therefore, I should resize the local
size for each rank to accommodate the replicas manually. Right? </font></li></ul>
</div>
<div><br>
</div>
<div>Anyway, I think this this will take me more time I expected originally. Meanwhile, I will go ahead with my “humble” parallelization scheme which consist in using AllReduce to create a serial vectors with the variables I need to evaluate rank-wise the
residual equations of my problem (please, don’t judge me, publish or perish...)</div>
<div><br>
</div>
<div>Many thanks,</div>
<div>Miguel</div>
<div><br id="lineBreakAtBeginningOfMessage">
<div><br>
<blockquote type="cite">
<div>On Feb 24, 2024, at 4:24 PM, Matthew Knepley <knepley@gmail.com> wrote:</div>
<br class="Apple-interchange-newline">
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<div dir="ltr">On Fri, Feb 23, 2024 at 5:14 PM MIGUEL MOLINOS PEREZ <<a href="mailto:mmolinos@us.es">mmolinos@us.es</a>> wrote:<br>
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Dear all, I am struggling on how to include ghost points in DMSwarm local vectors. According to PETSc documentation it seems “straightforward” for a DMDA mesh. However, I am not so sure on how to do it for a DMSwarm. In fact, if I add the result
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<div dir="auto">Dear all,
<div><br>
</div>
<div>I am struggling on how to include ghost points in DMSwarm local vectors. According to PETSc documentation it seems “straightforward” for a DMDA mesh. However, I am not so sure on how to do it for a <span style="">DMSwarm. In fact, if I add the result of </span><span style="color:rgb(99,99,36);font-family:Menlo,Monaco,"Courier New",monospace;white-space:pre-wrap;background-color:rgb(255,255,255)">DMSwarmGetLocalSize
</span><font>for each rank, the result is the <span>exact</span> number of particles in the system. Which means that the halo is zero. </font></div>
<div><span style=""><br>
</span></div>
<div><span style="">S</span><font>ince there is a function called </font><span style="color:rgb(99,99,36);font-family:Menlo,Monaco,"Courier New",monospace;white-space:pre-wrap;background-color:rgb(255,255,255)">DMSwarmCreateLocalVectorFromField,</span><span style="">I
was wandering if there is a function already implemented in </span><font>petsc (and I’m missing it) to </font><span style="">include ghost points </span><span style="">in DMSwarm</span><span style=""> and therefore don’t have to reinvent the wheel. If so,
is there any example out there I can follow?</span></div>
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</blockquote>
<div><br>
</div>
<div>DMSwarm is currently different from the other DMs. There is no idea of identity for particles, so there is no idea of a shared particle. You can create this by adding an ID to your particle fields, but it would be a manual process. DMSwarmMigrate() can
duplicate particles if you have an overlapping mesh, which would mimic shared particles.</div>
<div><br>
</div>
<div> THanks,</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>Thanks in advance.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Miguel<br>
<br>
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