[petsc-dev] Copy *SNES-struct deeply

[Jed Brown]

On Mon, Mar 4, 2013 at 10:36 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:

> So you save the solution at some time step. Then later in another part of
> the calculation, you time integrate the solution for a few time steps (from
> the saved time-step) to "fill in" the solution values you did not save,
> then you use the solutions for those several time steps, then you discard
> them.
>
>    So the question has nothing to do with SNES. It has to do with a "deep
> copy" of TS? Or being able to "restart" TS at a saved time step?
> Capabilities we want to build towards, but thinking in terms of a deep copy
> of SNES is a red herring.
>

Indeed, but presumably Johannes is working with an application that uses
SNES.


>
>    So, assuming one is using a single time integrator (not changing the
> integration method for different times), shouldn't this already pretty much
> work?
>

Yes, that's why I asked what sort of changes he was trying to guard
against. Saving an entire copy of the SNES for each problem is wasteful
when by far the most common case is to reuse configuration in each solve.
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