[petsc-users] TS and snes_grid_sequence

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> On Wed, Feb 10, 2016 at 4:19 PM, Jed Brown <jed at jedbrown.org> wrote:
>
>> Barry Smith <bsmith at mcs.anl.gov> writes:
>> >      We do not currently have library code to do grid sequence within a
>> time-step. I believe that providing this requires a great deal of
>> "replumbing" of the TS solvers to make them "grid sequence aware". This is
>> true I believe for both traditional grid sequencing and FAS (I would be
>> happy if Emil or Jed could prove me wrong).  There are seemingly multiple
>> ways to do the grid sequencing:
>>
>> I'm pretty sure you could use TS solved by FAS when Peter and I were
>> working on it.  But my test just failed and it looks like some work
>> vectors aren't being obtained correctly.  I'm afraid I can't dig into it
>> right now.
>>
>
> I use FAS with TS for the magma runs and it works.

The problem I encountered would only affect the case where you have both
an IFunction and an RHSFunction with a fully implicit method.

Thanks for the report that it works otherwise.
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