[Dune] gridfactory for rank > 0

[Oliver Sander]

Hi Andreas,
just so I understand your question correctly: you want to create the macro
grid on rank 0 only, and then distribute it.  Your question is: what happens
if I call insertVertex on other processes anyway?

> What is the expected behaviour for a GridFactory created on a process
> with rank>0?
> 1) You are not allowed to call things like insertVertex (ALU throws an
> exception)
> 2) insertVertex can be called but createGrid still returns an empty grid
>
AFAIK that was never discussed, and I'd have to look to know what UG does.
As somebody who doesn't really do parallel computing I have no opinion
on the subject.


> In the docu for UG we have
> If you're working on a parallel machine, and you want to set up a
> parallel grid, proceed as described only on the rank-0 process.
> Call <tt>loadBalance()</tt> to actually distribute the grid
> so the ALU behaviour seems the correct one?
>
Originally, the UGGrid behavior/docu basically just mimicked what UG
does/expects internally.  So we can change any of that with a democratic
vote.

best,
Oliver


> The problem is with the GmshReader which seems to ignore the rank and
> call insertVertex on all
> processors, causing ALU to throw an exception (at least it did that for
> me in the gmshtest).
>
> Best
> Andreas
>
>
>
>
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