I ended up passing the assemble_own_interior_faces_both flag to mesh-worker
mesh loop.
I will probably have to use these Consensus algorithms sooner or later
anyway.
Thank you.
Abbas
On Thursday, July 13, 2023 at 3:17:59 AM UTC+2 Wolfgang Bangerth wrote:
> On 7/11/23 08:23, Abbas Ballout wrote:
> > I don't want to just set a refinement flag for my cell but I also want
> to set
> > the refinement
> > flag for the neighbouring cell too and that is what
> ncellset_refine_flag();
> > doesThis doesn't work if the neighbouring cell is owned by another core
>
> Correct. That's because you can't set information on cells you don't own,
> in
> particular because it isn't clear what should happen if different
> non-owning
> processes (for which this cell is a ghost cell) disagree in their
> decisions on
> what they want to set.
>
> If you want to do this kind of thing, you probably want to collect a list
> of
> (cell_id, value) that you want to send to each of the neighboring
> processes,
> then send it via Utilities::MPI::isend(). Then you'd receive this kind of
> list
> on each process via Utilities::MPI::irecv(), unpack it, and then set the
> value
> on each of the cells in question.
>
> If you want a higher-level interface, you can use the functions in
> Utilities::MPI::ConsensusAlgorithms.
>
> Best
> Wolfgang
>
> --
>
> Wolfgang Bangerth email: bang...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
>
>
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