[Dune] [#742] performace loss between 1.2.2 and 2.0 (Attachment added)

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FS#742 - performace loss between 1.2.2 and 2.0
User who did this - Christian Engwer (christi)

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I made some further tests. I still like the splitting of IntersectionIterator and Intersection, but I changed some further things. Here are my results:

no-sp:    without shared_pointer
no-mc:    without memcopy (FieldVector)
new-move: new Implemention of move Operation
inherit:  clever inheritance of IntersectionIterator from Intersection
precomp:  precompute the Intersection-local mappings
geomup:   update position only when it is really necessary

0m48.159s: dune 1.2
1m4.816s:  no-sp no-mc new-move
0m52.519s: no-sp no-mc new-move inherit
0m44.639s: no-sp no-mc new-move inherit precomp
0m35.106s: no-sp no-mc new-move inherit precomp geomup

I ran a 3D FV example without IO on a 64^3 mesh.
You can find the latest version attached.

If anybody wants to test with his code... feel free.

Otherwise I would like to submit this asap.

Christian

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