[Dune] Parallel alugrid gmsh reading

[Jake Langham]

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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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