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

[Matthew Knepley]

On Wed, Sep 25, 2019 at 1:52 PM Mark Adams via petsc-dev <
petsc-dev at mcs.anl.gov> wrote:

> It's been a few years since we lost the ability to cache the eigen
> estimates, that smoothed aggregation computes, to chebyshev smoothers. I'd
> like to see if we bring this back.
>
> This is slightly (IMO) complicated by the fact that the smoother PC may
> not be Jacobi, but I think it is close enough (and an
> overestimate probably). Maybe provide a chevy option to
> chebyshev_recompute_eig_est.
>
> What do people think?
>

Okay, it seems like they should be stored in GAMG. Why would the PC type
change anything?

  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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