On Mon, Apr 23, 2012 at 20:40, tribur <burckhardt at itis.ethz.ch> wrote:
> Hi Jed, > > Thanks for the ultra fast response. > > Apart from the nonzero initial guess, is -ksp_type preonly -pc_type sor > -pc_sor_its 10 right? > Yes. You can use -ksp_initial_guess_nonzero -ksp_type richardson > > Am 24.04.2012 03:29, schrieb Jed Brown: > >> On Mon, Apr 23, 2012 at 20:27, tribur <burckhardt at itis.ethz.ch [1]> >> >> wrote: >> >> I would like to do 10 iterations of a point-by-point Gauss-Seidel >>> procedure for the purpose of testing. >>> >>> Is it correct if I type "mpiexec -n 1 ... -ksp_type preonly >>> -pc_type sor -pc_sor_its 10"? >>> >>> How can I define the initial guess nonzero? >>> >> >> With a nonzero initial guess, you are doing Richardson (not preonly). >> You can set the nonzero initial guess as usual >> (KSPSetInitialGuessNonzero()). >> >> Links: >> ------ >> [1] mailto:burckhardt at itis.ethz.ch >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120423/32380d26/attachment.htm>
