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<div style="direction: ltr;" id="divRpF398966"><font face="Tahoma" color="#000000" size="2"><b>From:</b> moab-dev-bounces@mcs.anl.gov [moab-dev-bounces@mcs.anl.gov] on behalf of Nico Schlömer [nico.schloemer@gmail.com]<br>
<b>Sent:</b> Monday, November 02, 2015 4:30 AM<br>
<b>To:</b> moab-dev@mcs.anl.gov<br>
<b>Subject:</b> [MOAB-dev] moab, tpetra::map<br>
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<div dir="ltr">I would liket to create a Tpetra::Map [1] from a MOAB parallel partition. To this end, I need to following:
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<div> * The notion of global ID of a node. I trust EntityHandle is what I'm looking for? EntityID appears to be the index a lot of times, aka, a local ID.<br>
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No, the EntityHandle refers only to a local partition<br>
In general, we keep a Global ID of a node in a tag called exactly like that <br>
"GLOBAL_ID"<br>
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When you just load a file, in different partitions, EntityHandle for vertices starts at 1 on each partition<br>
So they "overlap", it can't be used as global id;<br>
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to get the global id, you need to do something like this, on each partition<br>
Range verts;<br>
rval = mb->get_entities_by_dimensions(0,0, verts);<br>
std::vector<int> globalids;<br>
globalids.resize(verts.size());<br>
Tag gid;<br>
rval = mb->tag_get_handle("GLOBAL_ID", gid);<br>
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rval = mb->tag_get_data(gid, verts, &gid[0]);<br>
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<div> * Translate a Range into a std::vector. Seems easy given Range's operator[].</div>
<div> * Get owned nodes. Get owned plus shared nodes.</div>
<div> I'm still not quite familiar on how to best pick out entity sets from a pcomm. I see there's `get_pstatus_entities()`, but I don't see a PSTATUS_OWNED.</div>
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<div>Cheers,</div>
<div>Nico</div>
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<div>[1] <a href="https://trilinos.org/docs/dev/packages/tpetra/doc/html/classTpetra_1_1Map.html" target="_blank">https://trilinos.org/docs/dev/packages/tpetra/doc/html/classTpetra_1_1Map.html</a></div>
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