[petsc-users] More about SNESSetLagPreconditioner

[Jed Brown]

I've been meaning to implement this for a while. You can put custom SNES
control into a pre-stage or pre-step hook, but this particular case should,
in my opinion, be provided as a TS option.

On Wed, Oct 3, 2012 at 11:00 AM, Gong Ding <gdiso at ustc.edu> wrote:

> Hi,
> I am doing a nonlinear transient simulation. For each time step, a
> SNESSolve is called.
> I want to do a LU factorization at the first Newton iteration of EACH time
> step, and for the following Newton steps (in the same time step), no
> factorization any more. For the next time step, the LU factorization should
> be done again.
>
>
> SNESSetLagPreconditioner(-1) seems just skips all the following
> factorization, even in the different time step.
> How can I do?
>
>
> Gong Ding
>
>
>
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