[petsc-dev] [petsc-users] FETI-DP

[Jed Brown]

On Wed, Apr 20, 2011 at 17:05, Thomas Witkowski <
thomas.witkowski at tu-dresden.de> wrote:

> Following the mathematical representation wouldn't make it more sense to
> store B but B^T, because the local matrices B_i^T are real local and would
> have no off-diagonal elements?
>

They really can't because sometimes the Lagrange multiplier itself will be
stored on a different process. Also, this representation has lots of empty
rows where as storing B, every row has entries (usually 2 entries).
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