[petsc-users] Weighted Jacobi

[Matthew Knepley]

Or do you mean

  *-pc_jacobi_type rowsum*

*  Thanks,*

*    Matt*

On Tue, Dec 1, 2015 at 3:26 AM, Timothée Nicolas <timothee.nicolas at gmail.com
> wrote:

> OK, I'll look at that, thanks
>
> Timothee
>
> 2015-12-01 18:02 GMT+09:00 Dave May <dave.mayhem23 at gmail.com>:
>
>> I believe what you are looking for is defined by the following options
>>   -ksp_type richardson
>>   -ksp_richardson_scale <value>
>>   -pc_type jacobi
>>
>> Thanks,
>>   Dave
>>
>> On 1 December 2015 at 08:57, Timothée Nicolas <timothee.nicolas at gmail.com
>> > wrote:
>>
>>> Hi all,
>>>
>>> Is weighted Jacobi available as a preconditioner ? I can't find it in
>>> the list of preconditioners. If not, what is the rationale between this
>>> choice ? It is pretty straightforward to code, so if it is not available I
>>> can do it without problem I guess, but I am just wondering. In the
>>> matrix-free case where SOR is not available by default, it may be better
>>> than pure Jacobi, and much easier to parallelize than SOR.
>>>
>>> Best
>>>
>>> Timothee
>>>
>>
>>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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