[petsc-users] Help with ML/BoomerAMG

Gaetan Kenway gaetank at gmail.com
Mon Apr 29 21:07:22 CDT 2013

That makes sense. Is there a reasonably easy way of doing that in PETSc
currently for reasonably large systems?


On Mon, Apr 29, 2013 at 4:32 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Gaetan Kenway <gaetank at gmail.com> writes:
> > I would be very interested in looking at the problematic eigenmodes as
> > well. On my end I use Tecplot for all my visualization.  What sort of
> > visualization technique are you thinking about? Is it the KSP subspace
> > vectors you want to look at?
> No, it would be an eigensolve for either outliers or eigenvalues very
> close to zero.  The cost to find the vector is like several solves, but
> it would tell us exactly what sort of functions are poorly approximated
> by the preconditioner.  Then we would think about how we can change
> algorithms to make the preconditioner correct those functions better.
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