[petsc-users] Parallelize the Schur complement

[Sun, Hui]

I have a KSP with Mat [A00, A01; A10, A11], and I want to do Schur complement for the Mat
S=A11-A10*A00^(-1)*A01

How do I parallelize it? I mean, I use DMCreateMatrix to create A00, and I can parallelize the rows of A01 and A10^t by the same DM object. But I don't know how to parallelize the columns of A01 and A10^t. So right now, I can form a sequential S, and solve for the KSP that is corresponding to S sequentially. How can I create a parallelized S?

Thank you!

Best,
Hui
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