[petsc-users] multigrid_repartitioning

[Mark F. Adams]

On Jan 28, 2012, at 4:25 PM, Jed Brown wrote:

> On Fri, Jan 27, 2012 at 11:29, Mark F. Adams <mark.adams at columbia.edu> wrote:
> GAMG does not repartition by default anymore -- it is very expensive.  GAMG does now do simple process aggregation on coarser grids if repartitioning is not specified.
> 
> Couldn't we at least do some cheap (e.g. greedy) repartitioning?

Yes

> Or at least squish out empty ranks so that the coarser levels tend to be nearby on the network?

We do that now.

> Would it make more sense to do this or to work on a "real" partitioner.


I prefer to fold this into the new aggregation stuff. 
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