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

[Jed Brown]

On Wed, Apr 20, 2011 at 17:15, Thomas Witkowski <
thomas.witkowski at tu-dresden.de> wrote:

> 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).
>>
> Why could it happen to define a Lagrange multiplier, that "connects" to
> subdomains, i.e. two processes, on a third process?


Usually you would not choose this, but the Lagrange multiplier connects two
subdomains and is owned by only one process. The other needs some
communication to get its influence.
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