[Dune] CurvilinearGridAPI: Implementation of EntityTags and BoundaryIterators

[Aleksejs Fomins]

Dear Markus,

Thank you for your reply.

To be honest, this is just intuition, I do not have the exact numbers.

When I am done with the grid, I will temporarily write one such iterator
and compare the performance with iterating over all elements. Then I
will post the comparison results here, so that we can decide if it is
significant.

Aleksejs

On 12/19/2014 11:10 AM, Markus Blatt wrote:
> Hi,
> 
> On Thu, Dec 18, 2014 at 12:57:10PM +0100, Aleksejs Fomins wrote:
>>
>> 2) There is a whole set of calculations that can be performed by
>> iterating over the boundary of the grid, be it domain boundary or
>> interprocessor boundary. In our electromagnetic code, to this point we
>> have used the EntityIterator->IntersectionIterator->boundary() and
>> ->neighbor(), thus looping over all elements, then over all
>> intersections of the element, and only performing certain operations if
>> the faces of the element were not the internal faces. This operation
>> could be significantly accelerated, if it was possible to directly
>> iterate over DomainBoundaries and/or ProcessBoundaries. Is there
>> currently a way to perform this operation. If not, then we would like to
>> construct such iterators in CurvilinearGrid. We suggest classes
>> DomainBoundaryIterator and ProcessBoundaryIterator. We appreciate your
>> suggestions
> 
> Normally these boundary intersections are somewhat special, but not
> that much. What I mean is you calculations on other intersections,
> too, but the once on the boundary are a bit different. In this case
> looping over all elements and intersections and adapting the
> computation does not hurt much. Is this really different in your case?
> 
> Markus
> 
> 
> 
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