Matthew Knepley <[email protected]> writes: > Something very strange is happening here. CG should converge monotonically, > but above it does not. What could be happening?
Are you use -ksp_norm_type natural? CG is not monotone in other norms. Also, if boundary conditions are enforced using a nonsymmetric formulation (for example), then you can get lack of monotonicity with CG that may not be catastrophic.
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