[petsc-users] GMRES pc right fails while pc left succeeds

[Jed Brown]

On Mon, Jun 4, 2012 at 2:36 AM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:

> Yes, the diagonal of the velocity block is used to form the Schur
> complement approximation explicitly. I'm solving the velocity
> subsystem and the Schur complement subsystem to a relative tolerance
> of 0.01. Decreasing this tolerance does not change the behaviour of
> GMRES with right preconditioning.
>

Just to be sure, are both of these approximations in the preconditioner or
have you absorbed part into the "operator"?
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