[Dune] METIS load balancing with ALUGrid 1.50

[Eike Mueller]

Dear dune-list,

when I talked to the Dune developers in Heidelberg last December, it  
was mentioned that for the new ALUGrid version (1.50) METIS load  
balancing can be controlled by assigning weights to the links in the  
adjacency graph. Does anyone know more about this and can point me to  
more details? I want to ensure that in my case parallel partitioning  
only happens in the horizontal direction (I already know how to do  
this in YaspGrid).
When I use the default settings (with an older ALUGrid version) and  
let METIS do the partitioning, it usually almost gets it right (see  
bottom figure here: http://people.bath.ac.uk/em459/Dune/dune.html),  
but it sometimes generates 'steps', i.e. vertical columns are not  
always kept on the same node. I need to avoid this and make sure that  
each vertical column is exclusively owned by one process to use the  
vertical line smoother.

Thank you very much,

Eike

Dr Eike Mueller
Department of Mathematical Sciences
University of Bath
e.mueller at bath.ac.uk

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