[MOAB-dev] parallel i/o, not all vertices owned?

[Grindeanu, Iulian R.]

Sorry,
I didn't see all these messages until now.
these numbers refer only to vertices that are "shared" on  each local task

there are vertices on a task that are not shared with anybody, so they are owned by the local process

The example, again, refers only to shared entities

after ghosting, the number of shared entities grows (as ghost layers are exchanged too)

In moab, the convention is in general that the lower rank task owns the vertex if it is shared with other tasks.

So in the beginning (without  any ghosting), all shared vertices are owned by either task 0 or 1
________________________________
From: moab-dev-bounces at mcs.anl.gov [moab-dev-bounces at mcs.anl.gov] on behalf of Nico Schlömer [nico.schloemer at gmail.com]
Sent: Sunday, November 01, 2015 10:27 PM
To: Timothy Tautges
Cc: moab-dev at mcs.anl.gov
Subject: Re: [MOAB-dev] parallel i/o, not all vertices owned?

That's the thing: I only see 989+1078+679=2746 vertices out of a total 21218 owned. The rest is shared?

Also, before ghosting, I see that process 3 doesn't own anything. Is that intentional?

--Nico

On Mon, Nov 2, 2015 at 5:16 AM Timothy Tautges <timothy.tautges at cd-adapco.com<mailto:timothy.tautges at cd-adapco.com>> wrote:

Many verts are owned and not shared.

On Nov 1, 2015 10:12 PM, "Nico Schlömer" <nico.schloemer at gmail.com<mailto:nico.schloemer at gmail.com>> wrote:
When using MOAB's Parallel Hello-World example on [1], a mesh with  over 20k vertices, I'm getting
```
$ mpiexec -n 3 ./par-test
 global rank:0 color:0 rank:0 of 3 processors
 global rank:1 color:0 rank:1 of 3 processors
Reading file ./2.h5m
 with options: PARALLEL=READ_PART;PARTITION=PARALLEL_PARTITION;PARALLEL_RESOLVE_SHARED_ENTS
 on 3 processors on 1 communicator(s)
 Shared, owned entities on proc 0: 452 verts, 1162 edges, 711 faces, 0 elements
 Shared, owned entities on proc 1: 371 verts, 1037 edges, 666 faces, 0 elements
 Shared, owned entities on proc 2: 0 verts, 0 edges, 0 faces, 0 elements


 After exchanging one ghost layer:
 Shared, owned entities on proc 0: 989 verts, 1162 edges, 711 faces, 2301 elements
 Shared, owned entities on proc 1: 1078 verts, 1037 edges, 666 faces, 3349 elements
 Shared, owned entities on proc 2: 679 verts, 0 edges, 0 faces, 3182 elements
```
Only a few hundret owned vertices? That doesn't sum to to 20k. What's the issue here? Maybe I misunderstand the notion of ownage here.

Cheers,
Nico

[1] http://chunk.io/f/c3ee1eebbcbd4734a368ffb287f1f37f
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