[petsc-users] about pclu

[Jed Brown]

On Wed, Apr 6, 2011 at 05:27, Matthew Knepley <knepley at gmail.com> wrote:

> There should be no difference since direct solves take so long.


That is, solves are very fast compared to factorization.

If you just want to check the residual, Richardson is cheaper than GMRES
because it will require one fewer preconditioner/matrix applications.
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