[Dune] [#854] Improve performance of MCMGMapper

[Dune]

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The following task has a new comment added:

FS#854 - Improve performance of MCMGMapper
User who did this - Andreas Lauser (andlaus)

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As a DUNE user, I think it would be great if this gets merged. This does not involve any user-visible API changes and it sounds like a vast performance improvement for the mapper. Did you any tests for the mapper itself without iterating over the grid? I would suppose that for a 5% improvement of the FV scheme, the speedup of the mapper itself must be much larger...

Robert recently was caught saying that the overhead of using dune compared to using ALUgrid directly is between 10 to 20% for an explicit finite volume scheme:

http://lists.dune-project.org/pipermail/dune/2010-November/007754.html

If your statement is correct, this patch potentially reduces it to 5 to 15%, which is pretty good IMHO :)
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