[petsc-users] Help with ML/BoomerAMG

[Matthew Knepley]

On Mon, Apr 29, 2013 at 9:07 PM, Gaetan Kenway <gaetank at gmail.com> wrote:

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


Jed is working on it :)

   Matt


> Gaetan
>
> 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.
>>
>
>


-- 
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
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