[petsc-dev] TS is creating SNES ALWAYS even when not needed

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

> For example TSSetFromOptions() creates SNES, TSSetRHSFunction()
> creates SNES, TSSetProblemType() creates SNES!
>
> This is pitifully bad design, TS should only be creating SNES when
> SNES is needed! Unfortunately TS is now so badly contaminated with
> SNES it is not trivial to remove it.

It was an attempt to reduce the number of references and prevent the
opportunity for a user to, for example, TSGetSNES and then change the
SNES Jacobian.  But I'll need to overhaul this with IRKs anyway, for
which the SNES sees a larger system than what the user is providing.
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