[petsc-users] How to change KSP tolerance during SNES steps

[Hong Zhang]

behzad :

>
> I set SNES with -snes_ksp_ew to solve the system with inexact method. I
> want to reset the SNES into exact Newton with changing the KSP rtol at
> final iterations (in full Newton phase). How can I reset the KSP tolerance
> after specific iterations of SNES?
>
You can use SNESMonitorSet() and write your own monitor function to do this:
http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/SNES/SNESMonitorSet.html


Hong
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