[Dune] [#1018] RFC Patch: allow different convergence criteria in dune-istl (Attachment added)

[Dune]

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User who did this - Andreas Lauser (andlaus) 

Attached to Project - Dune
Summary - RFC Patch: allow different convergence criteria in dune-istl
Task Type - Feature Request
Category - Solver
Status - Unconfirmed
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - 2.1
Due in Version - Undecided
Due Date - Undecided
Details - Hi,

Although we at LH2 are generally really happy with the solvers of Dune-ISTL, we would like to use a different convergence criterion than the reduction of the two-norm of the residual. I've prepared a proof-of patch which makes the criterion pluggable and did some measurements with Dumux. In the end, the whole simulation was about 25 % faster (see the attached logfiles).

note, that this patch is currently more a proof of concept against dune 2.1 and I would appreciate some feedback. the patch description is the following:

    it works by adding a template argument 'ConvergenceCriterion' to the
    solver. The default criterion is to look at the reduction of the
    defect for the current iterative solution. This is the behaviour of
    the ISTL solvers before this patch, so no code needs to be changed if
    the current behaviour ought to be kept. The patch adds a second
    criterion which checks whether the weighted difference between two
    iterations is below a given threshold. This second criterion is called
    'FixPointCriterion' and shows better performance (at least for Dumux,
    where the Newton-Raphson solver uses a relative convergence criterion).
    
    So far, only the BiCGStab solver has been modified. If this patch has
    any chance of getting merged into the Dune trunk, I will also modify
    the other solvers.


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