[petsc-users] Assembling primal Schur matrix in FETI-DP method

[Jed Brown]

On Mon, Nov 21, 2011 at 04:00, Thomas Witkowski <
Thomas.Witkowski at tu-dresden.de> wrote:

> Some technical question on this point: How can I explicitly factorize a
> sequential matrix? Is MatLUFactor the correct function to do it?


In general, I recommend using the KSP. You can KSPSetType(ksp,KSPPREONLY),
PCSetType(pc,PCLU). Call KSPSolve() multiple times, the factorization will
be reused. Or you can use MatLUFactor() directly if you really want.


> If so, how can I provide the package (i.e. umfpack) that should be used
> for factorization?


See the MatSolverPackage argument in one of these.

http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/PC/PCFactorSetMatSolverPackage.html

http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatGetFactor.html
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