[petsc-users] large number of iteration.

Mark Adams mfadams at lbl.gov
Thu Aug 16 08:45:59 CDT 2018


>
>
> if I run the problem with -ksp_chebyshev_esteig_noisy and -pc_type gamg,
> I get the same error.
>
>
And assuming that  -ksp_chebyshev_esteig_noisy is working, this implies
that the matrix is messed up. It is not clear what level this error
happened on. If it is a coarse grid then the jacobi will work.
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