[petsc-users] Reusing preconditionner values

[fabien delalondre]

Hi,

To maybe try to speed up my resolution, I would like to not compute the
values of the preconditionner at every time step, I was wondering if I could
do the following:
1) At a certain point in time, I ll use
KSPGetPC<http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/KSP/KSPGetPC.html>
to
get the preconditionner
2) I would then use
KSPSetPC<http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/KSP/KSPSetPC.html>
to
set the values of the preconditionner, assuming this will prevent the
calculation of the preconditionner values. Is it a correct assumption or
should I use a parameter to enforce not re-calculating the precontionner
values ? Note that I am using a GMRES solver with a block jacobi
preconditionner (superlu).

Thank you

Fabien

-- 
Fabien Delalondre, PhD.
Senior Research Associate, Scientific Computation Research Center (SCOREC).
Rensselaer Polytechnic Institute (RPI), Troy, NY.
Email: delalf at scorec.rpi.edu, Phone: (518)-276-8045
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