[Dune] GridFactory and parallel grids (and boundary adaptation)

[Aleksejs Fomins]

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Dear Jo,

CurvilinearGMSHReader is currently capable of reading meshes in
parallel. That is, each process reads only the part of the mesh which
it needs. Adapting this reader to non-curvilinear grids should be
almost as straightforward as only reading linear gmsh files. It uses a
slightly extended version of a GridFactory which allows to insert
additional information into the Grid, however, adapting this to use
standard Dune GridFactory and disregard curvilinear information should
not be too much work. Please be a little patient, we will definitely
make this tool public before summer.

Best,
Aleksejs

On 11/02/15 12:52, Jö Fahlke wrote:
> Am Tue, 10. Feb 2015, 19:02:12 +0100 schrieb Jö Fahlke:
>> With regard to loading a parallel grid with the GridFactory, the
>> current informal standard seems to be inserting on rank 0 only,
>> inserting nothing on the other ranks, and following that by a
>> loadBalance().  I know that worked with the old ALUGrid, and
>> apparently UG supports that too[1].  Is that still the way to go
>> with dune-alugrid or are there better ways (so long as you want 
>> to keep using the GridFactory?).
> 
> As Robert pointed out to me, there is indeed a better way in
> ALUGrid, see[1]: insert each vertex on each rank it is needed with
> a globally unique identifier, and optionally identify process and
> domain boundaries.
> 
> [1] http://arxiv.org/abs/1407.6954, page 11-12
> 
> There is no mention about GmshReader however.  I am pretty certain
> that there is no specialization of the GmshReader that takes
> advantage of the parallel GridFactory, though it should be pretty
> straight-forward to add one (GSoC anyone?).  Still the method
> mentioned above should work as long as the grid data fits into rank
> 0's memory.  Please correct me if I'm wrong.
> 
> There is also no mention about parallel boundary adaptation, so I'd
> still be interested if there is some ALUGrid-specific way to do
> that.
> 
> Regards, Jö.
> 
> 
> 
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