回复： about combining the GMRES and smooth methods

[jiaxun hou]

But I already had another preconditioner. I want to study the behave of  the smooth method in the GMRES with my preconditioner. How can I do?
 Thanks!
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----- 原始邮件 ----
发件人： Barry Smith <bsmith at mcs.anl.gov>
收件人： petsc-users at mcs.anl.gov
已发送： 2007/1/28(周日), 上午11:28:35
主题： Re: about combining the GMRES and smooth methods


It seems extremely likely that you do not want to do this.

  If you want to use SOR or SSOR as a preconditioner for GMRES simply
use -pc_type sor; see the manual page for PCSOR for other options.

   Barry


On Sun, 28 Jan 2007, jiaxun hou wrote:

> Hi, 
I want to add a smooth method in the GMRES routine.  I do it in the function KSPSolve_GMRES of  /src/ksp/ksp/impls/gmres/gmres.c. The code likes that:

PetscErrorCode KSPSolve_GMRES(KSP ksp) {
.....
     ierr = GMREScycle(&its,ksp);CHKERRQ(ierr);
     
     ierr = MatRelax(ksp->pc->mat, ksp->vec_rhs,1,SOR_FORWARD_SWEEP,0,1,1,ksp->vec_sol);CHKERRQ(ierr);
.....
}

But  compile fail. Is it the right way? 
Thanks.


        
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