[petsc-users] Preconditioner and number of processors

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> Always use a direct solver for fidelity tests, like SuperLU or MUMPS.

Direct solvers are good when you don't care about how the solve is done.
You can use -pc_type redundant in parallel, for example.

If you are interested in the way the solver behaves, consider -pc_type jacobi.
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