[Dune] [#623] Make memory layout of class Matrix contiguous

[Dune]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Oliver Sander (sander) 

Attached to Project - Dune
Summary - Make memory layout of class Matrix contiguous
Task Type - Feature Request
Category - ISTL
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - The class Matrix (a dense dynamic istl matrix) is currently implemented as a BlockVector of BlockVectors.  Hence some memory is wasted and the rows may not be adjacent in memory. Since Matrix is frequently used for local element matrices, which are performance critical, this may have a noticeable impact.  A better implementation would use a contiguous chunk of memory.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=623

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