[Dune] DUNE running out of memory on 65536 cores?

[Markus Blatt]

Hi,

On Wed, Mar 21, 2012 at 09:50:04AM +0000, Eike Mueller wrote:
> I now tried it again with the latest version of the trunk (I use
> revision 1542) of dune-istl, but it still fails with the same error
> message (running out of memory) if I run the code on 65536 cores.
> 

I just took another look on my code on Blue Gene. You have to provide
 -DAMG_REPART_ON_COMM_GRAPH in the CPPFLAGS. Using this flag the graph
 that we partition is much smaller (one vertex per core).

Of course this will only help if the memory problem occurs within ANG:

Markus

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