[petsc-users] How to implement multigrid preconditioning without DMMG

[Barry Smith]

   Look at the examples, for nonlinear problems look at src/snes/examples/tutorials/ex19.c for linear problems look at src/ksp/ksp/examples/tutorials/ ex45.c they are both translations of what use to be DMMG examples so should show you exactly what needs to be done.

   Barry

On Jun 17, 2012, at 5:27 AM, fdkong wrote:

> Hi everyone,
> 
> I has been developing some solvers with multigrid preconditioning built on the top of Object DMMG. Now, I update Petsc from 3.2 to 3.3, and find that there is no DMMG. I try to modify my code so that it can run on new Petsc. But I don't know how to transfer my code. If directly modify code,  it will take me a lot of time. Even further, I cann't find any example on how to use "PCMG". 
> 
> Regards,
> ------------------
> Fande Kong
> ShenZhen Institutes of Advanced Technology
> Chinese Academy of Sciences
>