[Dune] [#854] Improve performance of MCMGMapper (Attachment added)

[Dune]

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User who did this - Martin Nolte (nolte) 

Attached to Project - Dune
Summary - Improve performance of MCMGMapper
Task Type - Feature Request
Category - Dune Core Modules
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.1)
Due in Version - Undecided
Due Date - Undecided
Details - The finite volume example from the dune-grid-howto can be sped up by more than 5% using the attached version of the MCMGMapper. This implementation uses arrays to store the offsets based on the topololgyId (with a special treatment for none).

The question is whether we want to merge this into the trunk, since the implementation is not well tested, yet. Additionally, up to 5% performance in an explicit finite volume scheme might not be enough reason for some people. Opinions?

One or more files have been attached.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=854

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