[petsc-dev] MetSetBlockSize issue

[Jed Brown]

On Wed, Apr 25, 2012 at 17:58, Mark F. Adams <mark.adams at columbia.edu>wrote:

> The blocks are not always dense, so by what appears to be your definition
> of block size it is not (always) a 'column block size'.   But I think that
> it is  semantically a blocked matrix and hence it has a column block size.


I think we shouldn't try to encode the near-null space being sparse. For
elasticity, we would only reduce the 18 matrix entries to 12, which is only
about break-even on storage since the dense null space can use fewer column
indices (this is ignoring the dense case also being more efficient).
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