Thanks Jed. And in the term ||Ae||/||Ax||, PETSc impilictly assume that we use zero as initial guess and here the x really means exact solution, right?
Yan On Tue, Sep 15, 2009 at 6:41 PM, Jed Brown <jed at 59a2.org> wrote: > Ryan Yan wrote: > > But can you say a little more about what happened in the first scenario, > I > > did not quite fellow you. Let's say, If I set -ksp_rtol 1e-2, what does > this > > mean in the left PC case. More specifically, which term will be > considered > > as a stop creteria for the KSP solve. > > Look at the first column (preconditioned residual norm). Notice that > this is decreasing by 1e-2 and 1e-3 respectively in your examples. > > Jed > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20090915/d0631ca9/attachment.htm>
