On Wed, Apr 25, 2012 at 2:19 PM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:
> > Notice that there is no increase in the residual as is required. Notice > also > > that > > there is no decrease. This must mean that the preconditioner is rank > > deficient, > > and I think it probably means that it is 0 since I find it hard to > believe > > that P x > > produces no component in the b direction. > > Should this be the case, how would I get correct results for several > benchmarks without using the option? This is not what I said. Look closely at the above. I said the preconditioner you give back when using -snes_mf_operator is not right. This has nothing to do with normal operation. Matt > > Dominik > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120425/46cbfb13/attachment.htm>
