[Dune] [#875] Loss of 5% performance in GeometryGrid

[Dune]

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User who did this - Martin Nolte (nolte) 

Attached to Project - Dune
Summary - Loss of 5% performance in GeometryGrid
Task Type - Bug Report
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 allocator changes in the GenericGeometry require copying the entire geometry instead of just a pointer. This leads to a performance decrease of up to 5% in an explicit Finite Volume scheme on GeometryGrid. The reason is that the GeometryGrid intersection internally stores a copy of the element geometry.

Hopefully, this performance loss can be regained after changing returned geometries to objects. I seriously doubt this, though.

There is another way to circumvent this copy: Only store a poiner to the entity (not an EntityPointer!). I don't know whether this conforms to the interface, though, since the intersection iterator becomes invalid once the Entity instance on which ibegin / iend was called goes out of scope.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=875

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