[petsc-users] how to set the parameters of FGMRES inner iterative

[Barry Smith]

  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 刘林 <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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20100903/c42d5afc/attachment.htm>