[petsc-users] Use block Jacobi preconditioner with SNES

[Ali Reza Khaz'ali]

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 <arkhazali at cc.iut.ac.ir> 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