[Dune] Parallel grid partitioning

[Eike Mueller]

Hi Andreas,

ok, I'll try the default loadbalancing first, maybe that's already not  
too far away from what I want, at the moment I'm still struggling as I  
can't get METIS to work. Hopefully the partitioning will be reasonably  
close to what I want, it should at least keep vertical columns  
together and usually I have more elements going around the globe than  
in the radial/vertical direction (ratio is about 16 to 1). Does the  
order in which I insert the vertices/elements have any influence on  
the outcome of the partitioning?

Thanks,

Eike

On 12 Oct 2011, at 20:24, Andreas Dedner wrote:

> 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?
>>>
>
>
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