[petsc-dev] Mark, what's the rational for keeping the Chebyshev tuning inside GAMG?
Jed Brown
jed at jedbrown.org
Sun Feb 22 09:32:31 CST 2015
Barry Smith <bsmith at mcs.anl.gov> writes:
> Huhh?
The smoothed interpolation satisfies
P_{smoothed} = (1 - w D^{-1} A) P_{tentative}
where D^{-1} is Jacobi (could be point-block Jacobi), but cannot be SOR.
GAMG is computing the estimate in order to choose w.
> But anyways, even if GAMG turns on Cheby/Jacobi as the smoother
> there is not reason the Chebyshev estimator you wrote cannot be
> used since it just uses whatever PC has been set. So your response
> seems completely orthogonal to my question. Can we merge and just
> have one Chebyshev estimator?
I think yes, after adding KSPChebyshevGetEigenvalues().
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