#1348 slow convergence monitors in istl iterative solvers

Metadata

Property	Value
Reported by	Arne Morten Kvarving (arne.morten.kvarving@sintef.no)
Reported at	Sep 5, 2013 14:05
Type	Feature Request
Version	2.2
Operating System	Unspecified / All

Description

I am in need of a mechanism to detect and handle slow convergence in the ISTL iterative solvers.

just to give an idea of how it could look; throw an exception after k iterations with ratio > alpha, for given k and alpha.

usage scenario: my users cannot be expected to have much know-how about linear solvers. i have an expensive preconditioner which should only be used when necessary (extremely anisotrophic grids). i have heuristics to try to choose one, but i don't want to make these too conservative. thus, sometimes the wrong preconditioner is selected. i need to be able to detect this, and rerun with the expensive one without user interaction.