[petsc-users] multigrid_repartitioning

[Jed Brown]

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? Or at
least squish out empty ranks so that the coarser levels tend to be nearby
on the network? Would it make more sense to do this or to work on a "real"
partitioner.
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