[Dune] Parallelization of dune-multidomaingrid

[Oliver Sander]

Hi Paul,

it's great to hear people are still using dune-multidomaingrid.
As you may have noticed it does not get the attention it deserves these days...

Can I ask you to extend the `testparallel.cc` test file such that
it triggers the bug? (Or create a new .cc file if you think
that's more appropriate) Then please post the changes as a merge request at

   https://gitlab.dune-project.org/extensions/dune-multidomaingrid

That way it is much easier to understand, discuss, and fix the bug.

Thank you,
Oliver


On 12.10.23 12:28, Paul Maidl wrote:
> Dear Dune Developers,
> 
> we are working with Dune on a multidomain simulation tool for our research.
> 
> To do so we want to use dune-multidomaingrid together with the dune core library, which is working successfully in sequential application. During our work for the parallelization we encountered the problem, that the loadBalance() function for the multidomaingrid does not compile. Attached you find a minimal example. Since the error seems to come from some kind of data handle we also tried the overload function loadBalance(DataHandle& dataHandle) for the multidomaingrid, which is also not working. This seems to be related to one of the GitLab issues (https://gitlab.dune-project.org/extensions/dune-multidomaingrid/-/issues/2). Unfortunately the issue is still open.
> 
> The questions we have are:
> 
> Is there some bug-fix already known and might be available in near future?
> 
> Do we use the functionality of the load balancing in the intended way?
> 
> And in case we have not made some mistake and there is no bug fix, what way of implementing a parallel solver for multidomain applications can you recommend for using Dune?
> 
> Best regards and thanks in advance
> 
> Simon Hein and Paul Maidl
> 
> 
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