On Fri, Dec 23, 2011 at 07:43, Matthew Knepley <knepley at gmail.com> wrote:
> Even if you lose orthogonality, it will just stagnate since you always > have the solution > from the first few vectors. Likewise, I do not see how you can get an > diverging sequence > from restarting since you always have the last residual, you just stagnate. > The true residual can grow even though the estimate of the preconditioned residual decreases monotonically. When you restart, you re-evaluate the actual residual, which might be much larger. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111223/300c4290/attachment.htm>
