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Dear PETSc team: (Hoping to get a hold of Jed and/or Matt for this one) (Also, sorry for the mouthful below) I'm developing routines that will read/write CGNS files to DMPlex and vice versa. One of the recurring challenges is the bookkeeping
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Dear PETSc team:<br>
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(Hoping to get a hold of Jed and/or Matt for this one)</div>
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(Also, sorry for the mouthful below)</div>
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<br>
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I'm developing routines that will read/write CGNS files to DMPlex and vice versa.</div>
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One of the recurring challenges is the bookkeeping of global numbering for vertices and cells.</div>
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Currently, I am restricting my support to single Zone CGNS files, in which the file provides global numbers for vertices and cells.</div>
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I used PetscHSetI as exemplified in DMPlexBuildFromCellListParallel() to obtain local DAG numbers from the global numbers provided by the file.</div>
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I also used PetscSFCreateByMatchingIndices() to establish a basic DAG point distribution over the MPI processes.</div>
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I use this PointSF to manually assemble a global PetscSection.</div>
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For owned DAG points (per the PointSF) , I call PetscSectionSetOffset(section, point, file_offset);</div>
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For ghost DAG points (per the PointSF) I call PetscSectionSetOffset(section, point, -(file_offset + 1));</div>
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All of what I have just described happens in my CGNS version of DMPlexTopologyLoad().</div>
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My intention is to retain those numbers into the DMPlex, and reuse them in my CGNS analogues of DMPlexCoordinatesLoad(), DMPlexLabelsLoad(), and DMPlexGlobalVectorLoad().</div>
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Anyhow, is this a good wait to track global numbers?<br>
Also, I need (for other applications) to eventually call DMPlexInterpolate() and DMPlexDistribute(), will the global PetscSection offsets be preserved after calling those two?</div>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;">Sincerely:</span></p>
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<span style="font-family: "Courier New", monospace; font-size: 14pt; color: red;"><b><u>J.A. Ferrand</u></b></span></p>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;">Embry-Riddle Aeronautical University - Daytona Beach - FL<br>
Ph.D. Candidate, Aerospace Engineering</span></p>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;">M.Sc. Aerospace Engineering</span></p>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;">B.Sc. Aerospace Engineering</span></p>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;">B.Sc. Computational Mathematics</span></p>
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</span></p>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;"><u>Phone:</u> (386)-843-1829</span></p>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;"><u>Email(s):</u> ferranj2@my.erau.edu</span></p>
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<span style="font-family: "Times New Roman", Times, serif; font-size: 12pt; color: black;"> jesus.ferrand@gmail.com</span></p>
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