Mark Adams <mfad...@lbl.gov> writes: > I am creating an Schur complement matrix explicitly (solver%schur) and > setting it with code like: > > call SNESGetKSP(solver%snes,innerksp,ierr) > call KSPGetPC(innerksp,spc,ierr) > call > PCFieldSplitSetSchurPre(spc,PC_FIELDSPLIT_SCHUR_PRE_USER,solver%schur,ierr) > > I would think that the "inner" solver would not be used but it is getting > used.
[...] > PC Object:(fsa_) 4 MPI processes > type: fieldsplit > FieldSplit with Schur preconditioner, factorization FULL > Preconditioner for the Schur complement formed from A11 I would set a breakpoint at PCFieldSplitSetSchurPre_FieldSplit and then watch -l jac->schurpre since it appears that your information is being lost somewhere.
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