[petsc-users] Use block Jacobi preconditioner with SNES

[arkhazali at cc.iut.ac.ir]

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 01:45To: 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
> 

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