[Dune] Parallel grid partitioning

[Eike Mueller]

Dear all,

thank you very much for all your replies, that's already quite a few 
ideas to try out!

Eike

Jö Fahlke wrote:
> Am Thu, 13. Oct 2011, 11:17:01 +0200 schrieb Markus Blatt:
>> That is an interesting feature. Does anyone know how the prepartioned
>> grid is read in?
> 
> Each rank has it's own file.  Just give the file name as a constructor
> argument when creating the grid.
> 
>>                  Does every process read its own partition or does a
>> master process read the whole grid and distributes it according to the
>> partitioning?
> 
> Each process reads it's own, no redistribution has to be done.
> 
>> How much memory is needed per process? Just enough for its partition
>> or more?
> 
> Just enough for it's partition.
> 
> For me, this provided the only way to go onto the cluster:  The cluster nodes
> didn't have enough memory to read in and partition the full grid -- so I did
> the partitioning on a shared-memory system lots of RAM and copied the
> resulting .alu files to the cluster.
> 
> There are some utility programs in dune-grid/src:
> 
>  - gmsh-to-alu, which  reads in a gmsh  file, lets ALUGrid  distribute it, and
>    writes  out the resulting  ALUGrid files  (optionally with  physical entity
>    information attached to the codim=0 entities).
> 
>  - alu-to-vtk, which reads in a set of native ALUGrid files and produces a set
>    of VTK files from it, so you can have a look at the partitioning.
> 
> You need to configure dune-grid with --enable-extra-utils, otherwise these
> utilities are not compiled.
> 
> Bye,
> Jö.
> 
> 
> 
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