Matrix free preconditioning

Tim Kroeger tim.kroeger at
Tue Oct 14 07:26:40 CDT 2008

Dear PETSc developers,

Can you give me some advice on possible/recommended choices of 
preconditioners in the case of matrix free ksp?  I create my matrix 
using MatCreateShell().  The matrix is not symmetric.  I understand 
that the typical preconditioners like ILU or JACOBI will not work 
since they require access to the matrix entries.  Is there any good 
precoditioner that will work?

Best Regards,


Dr. Tim Kroeger                                        Phone +49-421-218-7710
tim.kroeger at, tim.kroeger at  Fax   +49-421-218-4236

MeVis Research GmbH, Universitaetsallee 29, 28359 Bremen, Germany

Amtsgericht Bremen HRB 16222
Geschaeftsfuehrer: Prof. Dr. H.-O. Peitgen

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