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

Mark Adams mfadams at lbl.gov
Thu Sep 26 06:45:29 CDT 2019


>
> 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/
> <http://www.cse.buffalo.edu/~knepley/>
>
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