On Fri, Mar 9, 2012 at 11:05, Barry Smith <bsmith at mcs.anl.gov> wrote:
> Here is the problem. We cannot use LSC with user provided L (and Lp) > and PCFIELDSPLIT now AT ALL!! That sucks, maybe we shouldn't be looking > for a perfect solution but for now just one that works somewhat! > Yup, this is why I still have hacks that implement MatGetSubMatrix() to pass this stuff around. I'll follow your suggestion here. How urgent is this? > > > I will suggest the following approach. Attach various L to the original > Jacobian with a different name for each. In your case L_displacement and > L_pressure, have PCFIELDSPLIT propagate them to the Schur matrix. Then > have -prefixfromfieldsplit_pc_type lsc -prefixfromfieldplit_lsc_name > L_displacement to tell LSC which one to use. > > Barry > > Not perfect since the user could name the wrong lsc for the Schur index > sets used but it is better than nothing. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20120309/045e2f01/attachment.html>
