See https://gitlab.com/petsc/petsc/-/merge_requests/6436 with commit barry/2023-05-08/add-ksp-min-its
> On May 7, 2023, at 2:22 PM, Edoardo alinovi <edoardo.alin...@gmail.com> wrote: > > 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! > > Cheers
