Re: [petsc-dev] getting eigen estimates from GAMG to CHEBY

[Mark Adams via petsc-dev]

>
> Okay, it seems like they should be stored in GAMG.
>

Before we stored them in the matrix. When you get to the test in Cheby you
don't have caller anymore (GAMG).


> Why would the PC type change anything?
>

Oh, the eigenvalues are the preconditioned ones, the PC (Jacobi) matters
but it is not too sensitive to normal PCs that you would use in a smoother
and it is probably not an understatement.


>
>   Thanks,
>
> Matt
> --
> 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
>
> https://www.cse.buffalo.edu/~knepley/
> 
>

Re: [petsc-dev] getting eigen estimates from GAMG to CHEBY

[Mark Adams via petsc-dev]

As I recall we attached the eigenstates to the matrix. Is that old attach
mechanism still the used/recommended? Or is there a better way to do this
now?
Thanks,
Mark

On Thu, Sep 26, 2019 at 7:45 AM Mark Adams  wrote:

>
>
>> Okay, it seems like they should be stored in GAMG.
>>
>
> Before we stored them in the matrix. When you get to the test in Cheby you
> don't have caller anymore (GAMG).
>
>
>> Why would the PC type change anything?
>>
>
> Oh, the eigenvalues are the preconditioned ones, the PC (Jacobi) matters
> but it is not too sensitive to normal PCs that you would use in a smoother
> and it is probably not an understatement.
>
>
>>
>>   Thanks,
>>
>> Matt
>> --
>> 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
>>
>> https://www.cse.buffalo.edu/~knepley/
>> 
>>
>