RE: Preconditioner for bicg

["Keita Teranishi" <keita@xxxxxxxx>]

Hi Barry,

Could you suggest any other KSP solvers that have the same type of problems?

Thanks,
================================
 Keita Teranishi
 Math Software Group
 Cray Inc.
 keita@xxxxxxxx
================================

-----Original Message-----
From: owner-petsc-users@xxxxxxxxxxx [mailto:owner-petsc-users@xxxxxxxxxxx] On Behalf Of Barry Smith
Sent: Thursday, October 11, 2007 4:50 PM
To: petsc-users@xxxxxxxxxxx
Subject: Re: Preconditioner for bicg 


  For some preconditioners it is simply not easily possible to apply the 
transpose of the preconditioner. Even multigrid requires some work to do this.

   Barry


On Thu, 11 Oct 2007, Keita Teranishi wrote:

> Hi,
> 
>  
> 
> I'd like to make sure preconditioners supported for bicg. I found bicg only accepts preconditioners that is interfaced through PCApplyTranspose.
> 
> For this reason, I see several preconditioners fails with bicg.
> 
>  
> 
> Thanks,
> 
> ================================
>  Keita Teranishi
>  Math Software Group
>  Cray Inc.
>  keita@xxxxxxxx
> ================================ 
> 
>  
> 
>