You misunderstood my comment. I was not not trying to state that linear problems are silly, not at all. Only that I'm not interesting in adaptive mesh refinement on a purely linear problem.
Barry On Jan 7, 2010, at 3:06 PM, Jed Brown wrote: > On Thu, 7 Jan 2010 14:52:41 -0600, Barry Smith <bsmith at mcs.anl.gov> > wrote: > >> There would be no SNES in this context! One would be able to >> cleanly and simply (more so then today) put geometric multigrid >> inside >> a Schure fieldsplit preconditioner. If one can't then we screwed up >> our new design. > > I think we're agreeing. My comment was just a retort to the claim > that > linear problems are silly. They are silly if that's your end goal, > and > I believe they are still silly when using a scheme where the quality > of > your solution depends on the quality of the linear solve (as in a > semi-implicit scheme), but having a nice interface for linear MG is > important when it goes inside a preconditioner. In contrast, I think > that all special treatment of linear problems could be stripped out of > TS with no ill consequences. > > Jed