[petsc-users] Help with KSPSetConvergenceTest

Edoardo alinovi edoardo.alinovi at gmail.com
Sun May 7 13:22:57 CDT 2023

Hello Barry,

Mega! Thank you Berry much for providing me with a working example! I ended
up in writing this:

*        call KSPConvergedDefault(ksp, n, rnorm, flag, PETSC_NULL_FUNCTION,
ierr)        if (n<flubioSolvers%itmin) then             flag = 0
endif        ierr = 0*

and it looks working but I'll take advantage of your suggestion ;)  Is
KSPConvergedDefaultDestroy mandatory?

I know it's easy code, but maybe you might have a think to add this control
and expose it as the max number of iterations in KSP. I can tell you it is
very much used, I found myself many times in need to tell the solver to
iterate regardless of the tolerances criteria. It happens for example in
the RANS equation, especially omega. Sometimes they tend to stall and you
do want to tighten the tolerances for a bunch of iters, or you might not
know if they do while iterating!

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