[Dune] Iterator over Ghosts Nodes comes to the same node multiple times

[Patrick Leidenberger]

Hi all Dune-Developers,

I am a little bit confused by the behavior of

typedef typename GridType::template Codim<3>::
   template Partition<Dune::Ghost_Partition>::LeafIterator
     IteratorGhost;

iterator. It comes to the same node multiple times! This is not the 
behavior I expected.
So my question is: Is this a bug or a feature?

My system:
Current dune from SVN, last co 1h ago.
ALUgrid 1.23, with simplices in 3d
Standart Ubuntu 11.04, 10.10 with standart gcc, openmpi & co.

That you can reproduce my results, I modified the test-alugrid.cc from 
dune-grid/dune/grid/test and attached the file. Run it e.g. with
mpirun -np 3 ./test-alugrid 3dsimp
It iterates over InteriorBoarder_Partition and GhostPartition. For both 
cases it collects all coordinates of the nodes, put them in a list 
(separate ones) and sort the lists. You get e.g.
...
rank=1, Ghost,   -0.848528, -1.84853, 6.875
rank=1, Ghost,   -0.494975, -1.49497, 6.875
rank=1, Ghost,   -0.494975, -1.49497, 6.875
rank=1, Ghost,   -0.494975, -1.49497, 6.875
rank=1, Ghost,   -0.494975, -1.49497, 6.875
rank=1, Ghost,   -5.14352e-16, 0.2, 9.25
rank=1, Ghost,   -3.00038e-16, -0.3, 9.25
rank=1, Ghost,   -3.00038e-16, -0.3, 9.25
rank=1, Ghost,   -3.00038e-16, -0.3, 9.25
rank=1, Ghost,   -3.00038e-16, -0.3, 9.25
rank=1, Ghost,   -3.00038e-16, -0.3, 9.25
rank=1, Ghost,   -8.57253e-17, -0.8, 8.75
rank=1, Ghost,   -8.57253e-17, -0.8, 8.75
...

Thanks a lot for some tips, best regards

Patrick
-- 

-------------------------------------
Patrick Leidenberger
Phone: +41 44 63 20357
Email: leidenberger at ifh.ee.ethz.ch
Laboratory for Electromagnetic Fields
and Microwave Electronics
ETH Zuerich, Switzerland
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