[petsc-users] Question about a parallel implementation of PCFIELDSPLIT

[Pantelis Moschopoulos]

Dear all,

When I am using PCFIELDSPLIT and pc type "schur" in serial mode everything works fine. When I turn now to parallel, I observe that the number of ranks that I can use must divide the number of N without any remainder, where N is the number of unknowns. Otherwise, an error of the following form emerges: "Local columns of A10 3473 do not equal local rows of A00 3471".

Can I do something to overcome this?

Thanks,
Pantelis

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