[petsc-dev] [petsc-users] gamg failure with petsc-dev

Mark Adams mfadams at lbl.gov
Fri Aug 22 15:27:52 CDT 2014

On Thu, Jul 31, 2014 at 10:44 AM, Stephan Kramer <s.kramer at imperial.ac.uk>

> An update on this. We have been using mark/gamg-zerod branch and it fixes
> for us the issue with zero diagonals in the coarsened operators (making the
> sor smoother, but bizarrely not the jacobi smoother fail). We in fact have
> some cases where cheby+jacobi does not converge (indefinite pc), but
> cheby+sor (with the mark/gamg-zerod branch) works well, so we'd be very
> much interested in getting this (or something similar) merged in master.

Jed: this has been a pull request for 4+ months (#162).
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