[Dune] Parallel grid partitioning

[Andreas Dedner]

Hi Eike,

at the moment you do not have that amount of control on ALUGrids 
loadbalancing
strategy. So you can use the grid factory to setup the grid (on one 
processor) and then
call loadBalance but that will not lead to the partitioning you want. 
Unfortunately the
GridFactories concept does not really provide an interface for parallel 
grid setup so
repartitioning your grid and using the factory is not really supported. 
We have it on th
agenda to extend the grid factory for parallel grid construction but it 
we have not yet
fixed the interface accordingly.

I am sorry I can not give you a more positive answer
(but it is always a good first step to get something done if somebody 
actually needs it...)

Best
Andreas

>>> Second, I'm setting up a spherical shell with ALUGrid (see [1]). 
>>> Again I want to keep vertical columns together and not split into 
>>> the radial direction, so the sphere should be covered with eight 
>>> patches of equal size.
>>> So far I only managed to get the serial ALUGridFactory to work, if I 
>>> run in parallel, do I have to do the decomposition myself and call 
>>> inserVertex() and insertElement() on the appropriate processor or 
>>> can I do the balancing afterwards? Or do I have to insert all 
>>> vertices/elements on the master node?
>>