[petsc-users] How to use PETSc preconditioners in SLEPc?

[Heikki Virtanen]

Hi,

Ok. Thanks for all of you! I decided to stay in command line
options. I just had to change a couple of things in my code.
and now everything works. 

-Heikki

> > Thanks! If there is a way to avoid command line options,
> > it would be excellent. Sorry, that I didn't remember to 
> > mention this one. Your example has command line options
> > "st_ksp_type","st_pc_type","st_pc_hypre_type"
> 
> Note that you can use the PETSC_OPTIONS environment variable, a petscrc
> file, or any other file.  See the user's manual and this page for
> details.
> 
> http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Sys/PetscOptionsInsertFile.html
> 
> > Do they have an equivalent function calls?
> >
> > -Heikki
> >
> >> > Hi, I try to solve eigenvalue problem using EPS object 
> >> > and Krylov-Schur solver. Everything goes well and I 
> >> > can solve the problems that I want. 
> >> > 
> >> > Anyway, I want to use other preconditioners than the 
> >> > default preconditioner. It is a little bit unclear for
> >> > me how to do this. For example, I have installed
> >> > PETSc with Hypre. How can use BoomerAMG preconditioner
> >> > instead of ILU? ( SLEPc chooses this by default ) 
> >> > 
> >> > -Heikki
> >> 
> >> Have a look at section 3.4.1 of SLEPc's users guide. For instance, you can try something like this:
> >> 
> >> $ ./program -st_ksp_type bcgs -st_pc_type hypre -st_pc_hypre_type boomeramg
> >> 
> >> Jose
> >> 
> >  		 	   		  
 		 	   		  
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