[petsc-users] Suggestion for large scale Poisson's solver

[Hom Nath Gharti]

Thanks a lot!

On Thu, May 4, 2017 at 2:00 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>> On May 4, 2017, at 12:52 PM, Hom Nath Gharti <hng.email at gmail.com> wrote:
>>
>> Thanks, Barry. Is there a way to take advantage of the fact that the
>> matrix remains same during time steps?
>
>    Yes since you are not changing the matrix it will construct the preconditioner once and just use it forever.
>
>
>>
>> On Thu, May 4, 2017 at 1:47 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>>>
>>>> On May 4, 2017, at 12:10 PM, Hom Nath Gharti <hng.email at gmail.com> wrote:
>>>>
>>>> Dear all,
>>>>
>>>> I am trying to solve a Poisson's equation on the Earth models with the
>>>> following information
>>>>
>>>> - Degrees of freedom ~300,000,000
>>>> - I use MPIAIJ matrix
>>>> - Coefficient matrix is symmetric and doesn't change with time steps
>>>> - Need to compute for a large number of time steps
>>>>
>>>> Which solver/preconditioner is the most efficient for this problem? I
>>>> would be grateful for your suggestion.
>>>
>>>   Geometric multigrid is always best if you can use it. If not I would use hypre BoomerAMG, it should have very good convergence.
>>>
>>>
>>>>
>>>> Thanks,
>>>> Hom Nath
>>>
>