[Dune] communication problem in ALUGrid

[Arya Fallahi]

Thanks Markus for the explanations. It actually was never working since it
is a new code :-). I think with the new picture, I will be hopefully able
to fix the problem.

Thanks and best regards,
Arya


On Tue, Apr 8, 2014 at 9:53 AM, Markus Blatt <markus at dr-blatt.de> wrote:

> Hi Arya,
>
> On Sat, Apr 05, 2014 at 06:16:07PM +0200, Arya Fallahi wrote:
> > Dear Dune,
> >
> > I have since a couple of days a serious problem with communication in
> > ALUGrid and I could not still solve it.
>
> And it worked before? Weired!
>
> > I thought probably this email list
> > can be as always helpful for my problem. The problem seems to be easy
> but I
> > could not figure out how to solve it. It is described as follows:
> >
> > Suppose an element P is a ghost element in processor I and an
> > InteriorBorder element in processor J.
>
> Mental note: As we are talking about elements, it belongs to the interior.
>
> > In each processor there is a
> > variable K corresponding to the element. The value of of K in processor I
> > needs to be sent to processor J, added to K in processor J and saved
> > there.
> > This is what I need to do and I could not.
>
> You have to be aware that your view might be incorrect for more than 2
> processors. We do not send from one process to another one, but we
> send data attached to the same entity, but present on several
> processors in the correct partition, to all entities on all other
> processors where the entities belong to the correct partition.
>
> >
> > What I thought maybe correct to do is using the following parameters for
> > communication function:
> >
> >
> grid_.communicate(dataHandle,InteriorBorder_All_Interface,BackwardCommunication);
> >
> > This configuration should send values from all entities to buffer and
> then
> > write to InteriorBorder elements. Is it correct?
> >
>
> Yes.
> Your are sending values attached to all entities to all other
> processes where the same entities is in interior or border.
>
>
> > I think if all entities send the values to buffer then processors I and J
> > both send their K values to the buffer. Which one then is written?
> >
>
> The order in which they are written using your data handle is not
> specified. If you rely on a specific order you have to care about this
> in you data handle yourself.
>
> Markus
>
> --
> Do you need more support with DUNE or HPC in general?
>
> Dr. Markus Blatt - HPC-Simulation-Software & Services
> http://www.dr-blatt.de
> Hans-Bunte-Str. 8-10, 69123 Heidelberg, Germany
> Tel.: +49 (0) 160 97590858  Fax: +49 (0)322 1108991658
>
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