On Thu, Sep 23, 2010 at 17:07, Matthew Knepley <knepley at gmail.com> wrote: > It is an open secret that Krylov methods are incredibly sensitive to > orderings, especially when combined with incomplete factorization > preconditioners.
The ordering only affects the Krylov method in the form of rounding for dot products and such. But as Matt says, almost every preconditioner is significantly order-dependent. Jed
