[petsc-users] Monotonic convergence in FGMRES.

[Jed Brown]

On Tue, Dec 21, 2010 at 21:26, Vijay S. Mahadevan <vijay.m at gmail.com> wrote:

> 45 KSP preconditioned resid norm 2.511364148934e-07 true resid norm
> 1.865039278877e+02 ||Ae||/||Ax|| 2.699481989705e+02
>

The true residual is huge, this is not converging.  You probably have a
singular preconditioner.  What are you using (-ksp_view) and what system are
you solving with what discretization.
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