[petsc-dev] Revamping the multilevel KSP interface

[Jed Brown]

On Sat, Mar 17, 2012 at 21:34, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Is grid sequencing the only use case? What is the plan with grid
> sequencing for linear problems? Are the people who really want to do that
> capable of using SNES with KSPONLY? That would also make it easier to use a
> higher order prolongation the first time a given grid is reached, but use
> standard interpolants in subsequent cycles (as Achi does for the best work
> estimates).


And does anyone prefer this interface where they set a callback to build
the RHS instead of calling the function themselves (or constructing the RHS
any way they please)? I know it makes for a somewhat slick example, but the
user has to interact with a Vec anyway to get the solution out.

http://www.mcs.anl.gov/petsc/petsc-dev/src/ksp/ksp/examples/tutorials/ex25.c.html
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