[petsc-users] KSP convergence problem

[Jed Brown]

On Wed, Mar 20, 2013 at 5:04 PM, John Mousel <john.mousel at gmail.com> wrote:

> I've wanted to scrap this approach for a long time, but moving away from
> these GFM-type treatments is not a choice that I've been allowed to follow
> through on for various reasons which are out of my control.


Unless there are some clever tricks to characterize the null space or to
keep preconditioners compatible with the null space, the folks making the
decisions might have to reconsider. It doesn't matter how sexy a method
looks if it requires a solve and that solve cannot be done efficiently.
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