If you want to use, for example, GMRES as the preconditioner in FGMRES then
you use -pc_type ksp -ksp_ksp_type gmres -ksp_ksp_max_it 10 -ksp_pc_type ilu
etc
The best way to find options is to run with -help
The reason for the "extra" ksp in front of the last four options is that it
is setting the options for the inner ksp
Note that this is all automatically recursive to any level of imbedded
solvers.
I will this example to the KSPFGMRES manual page.
Barry
On Sep 3, 2010, at 9:53 AM, Matthew Knepley wrote:
> On Fri, Sep 3, 2010 at 4:45 PM, Liu Lin ?? <sixthseason at gmail.com> wrote:
> HI, every one!
> How to set the parameters of FGMRES inner iterative? such as the restart
> number, the preconditioner method ?
>
> 1) There is no inner iterative method in FGMRES
>
> 2)
> http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/KSP/KSPFGMRES.html
>
> 3) -pc_type
>
> Matt
>
>
> --
> -------------------------------------------------------------------------------
> --
> What most experimenters take for granted before they begin their experiments
> is infinitely more interesting than any results to which their experiments
> lead.
> -- Norbert Wiener
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