[petsc-users] GMRES pc right fails while pc left succeeds

[Jed Brown]

On Mon, Jun 4, 2012 at 8:45 AM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:

> Both approximations are in the preconditioner.


I'm afraid I don't have an explanation based on the information you have
sent. If you can set up a test case that shows the issue, I'll investigate
further.

I would think about null space issues. For example, if the Schur complement
has constants in its null space, but the right hand side is not consistent
and/or the KSP was not informed of the null space.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120604/321dd6f8/attachment.html>