[petsc-users] Use block Jacobi preconditioner with SNES

[Smith, Barry F.]

It is ready in the branch barry/add-mpivpbjacobi; please let me know if you have any difficulties

   Barry


> On Sep 6, 2018, at 4:48 PM, arkhazali at cc.iut.ac.ir wrote:
> 
> Yes, I'd be grateful if MPI support could be added, please.
> 
> Many thanks,
> Ali
> 
> ------ Original message------
> From: Smith, Barry F.
> Date: Fri, Sep 7, 2018 01:45
> To: Ali Reza Khaz'ali;
> Cc: PETSc;
> Subject:Re: [petsc-users] Use block Jacobi preconditioner with SNES
> 
>   I have not yet added this support, do you need it now?
> 
>    Barry
> 
> 
> > On Sep 6, 2018, at 4:12 PM, Ali Reza Khaz'ali 
>  wrote:
> > 
> > I have to apologize for making this topic so lengthy. Is vpbjacobi supposed to work in parallel mode (with MPI)?
> > 
> > 
> > On 8/30/2018 1:32 AM, Smith, Barry F. wrote:
> >> 
> >>> On Aug 29, 2018, at 3:48 PM, Ali Reza Khaz'ali 
>  wrote:
> >>> 
> >>> 
> >>>>    Can you confirm if your code ran successfully with vpbjacobi and if the convergence history was very similar to that achieved using
> >>>> bjacobi ?
> >>> They have a very very very small difference (which is probably due to round-off errors), they generally behave the same. My code run successfully with both of them with the same convergence history. However, vpbjacobi  seems a little faster.
> >>    Great, this is exactly what to expect. I will put the branch into next for testing and then it will be in the master branch and in the next release.
> >> 
> >>    Barry
> >> 
> >>> Many thanks,
> >>> Ali
> > 
> > -- 
> > Ali Reza Khaz’ali
> > Assistant Professor of Petroleum Engineering,
> > Department of Chemical Engineering
> > Isfahan University of Technology
> > Isfahan, Iran
> > 
> 
>