[Dune] communication problem in ALUGrid

[Andreas Dedner]

Dear Arya.
Its quite possible that there is a bug here - I have not yet tried to
use the BackwardCommunication
approach yet and I do not know if anybody has.
./space/common/cachedcommmanager.hhI think
grid_.communicate(dataHandle,InteriorBorder_All_Interface,BackwardCommunication);
should do the right thing though - so it probably is a bug in ALU. Have
you tried it with any of the other
grid managers for comparison? And a second question: Have you tried
All_All and use entity.ghost() etc.
to figure out what to do?
A small test case showing the problem would help to find the bug.
Sorry I can not say more at the moment
Andreas

On 05/04/14 17:16, 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. 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. 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.
>
> 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?
>
> 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?
>
> I may have done a stupid mistake because I do not have a complete
> picture of these interfaces and directions. It will be very helpful if
> someone describes it for me.
>
> Thank you very much for your help,
> Best regards,
> Arya Fallahi
>
>
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