[Dune] Parallel alugrid gmsh reading

[Aleksejs Fomins]

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Dear Jake,

As far as I am aware, the new alugrid module dune-alugrid allows parallel grid construction from the GMSH Reader, I have tested this functionality and it worked for me. Running a job in parallel (mpi), inserting vertices, elements, and maybe boundary segments, then simply calling factory.createGrid() should create a parallel alugrid, not a bunch of separated grid parts.

Also, I have recently written a new GMSH reader which can read curvilinear meshes, and reads the whole mesh in parallel, without the need of reading everything on rank 0. It is mostly operational and should see light very soon, the latest in mid September.

Greetings,
Aleksejs Fomins



On 07/07/15 14:19, Jake Langham wrote:
> Dear all,
> 
> I am trying to read gmsh files in for a parallel ALUGrid code.
> Browsing through the archives of this list, it seems this is an issue
> that has come up a couple of times in the past - however I couldn't
> find a definitive answer.
> 
> My understanding is that the way to go about this is to read
> everything in on rank 0, then call load balancing (for which, I use
> zoltan).
> 
> As has been pointed out on this list before
> (http://lists.dune-project.org/pipermail/dune/2014-July/012921.html),
> just calling the GmshReader on rank 0 doesn't work, since (possibly)
> one just gets a bunch of grids that can't talk to each other.
> 
> I have tried a bunch of different things in my code, mostly inspired
> by the previous thread about this, but probably just don't understand
> how Dune handles MPI well enough.
> 
> Since this seems a common problem, perhaps someone has this working
> now or at least has some more insight since the last time it was asked?
> 
> (N.b. A while back I also tried dune-grid's gmsh-to-alu converter. It
> did not seem to like my mesh files - but at that point I did not have
> time to figure out what was wrong there. I'll take another look at
> that soon.)
> 
> Thanks,
> 
> -Jake Langham
> 
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> 
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