[petsc-dev] strangness in Chebyshev estimate of eigenvalues

Mark Adams mfadams at lbl.gov
Thu Aug 27 16:38:14 CDT 2015


OK, I can put PetscRandom back into GAMG and add a check for DIVERGE_ITS in
the Cheby solve.  Is that necessary and sufficient?

Mark

On Thu, Aug 27, 2015 at 4:25 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Aug 27, 2015 at 2:17 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>>
>> > On Aug 27, 2015, at 2:15 PM, Jed Brown <jed at jedbrown.org> wrote:
>> >
>> > Barry Smith <bsmith at mcs.anl.gov> writes:
>> >>   Don't use drand48 directly; use PetscRandom. Matt promised to fix up
>> PetscRandom to use it by default and work on all systems so all you need to
>> do is use PetscRandom everywhere.
>> >
>> > Yes, that's what I meant.  But we need a deterministic seed.
>>
>>   Matt promised
>>
>
> Its in 'next',
>
>   -random_type rander48
>
>    Matt
>
> --
> 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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