Sparse Matrix Inversion using PETSc

["Dr. Timothy Stitt" <timothy.stitt@xxxxxxxx>]

Hi all,

I am currently investigating the best way to perform the inversion of a 
large sparse matrix and came upon the idea of using PETSc as a framework 
for testing various strategies from direct to iterative methods on my 
sample matrices. In this setup for an NxN sparse matrix A I would have N 
rhs's representing the Identity matrix and then solve for X. I wanted to 
experiment with both parallel and serial strategies ranging from LU 
Decomposition using SuperLU, MUMPS etc. to iterative methods using GMRES 
etc. Am I right in thinking that all this can be done in PETSc by 
setting up a core framework and then varying the solver methods etc?

I have looked over the sample KSP Solver codes although they only seem 
to suggest single vectors for x and b. Can this be changed to accept 
multiple vectors? Can anyone suggest a sample code that maybe 
demonstrates the sort of thing I want to achieve...if it is in fact 
possible.

Thanks in advance for any assistance given,

Regards,

Tim.