On Mar 23, 2013, at 12:55 PM, Jed Brown wrote:

On Sat, Mar 23, 2013 at 11:40 AM, Shri <[email protected]> wrote: I had added -pc_reuse specifically for use with fieldsplit since I wanted only a part of the preconditioner to be built only once, for e.g. -fieldsplit_0_pc_reuse. This would build the preconditioner for fieldsplit 0 only once. I had not added any API for it since it was meant to be experimental feature. If this feature is useful then I can add an API for it otherwise I can take it out.

If you want to give PCFieldSplit a "reuse" policy, then put the option in fieldsplit.c and have it pass SAME_PRECONDITIONER to the inner KSPSetFromOptions. I would also rather call this "lagging" (for consistency with SNES) instead of "reuse".

Since "-pc_reuse" is only recognized by PCLU and is implemented in the wrong place for generic use, I would like to delete it. (It's just a couple lines.) Is that okay with you?

I am not using it anymore so you can delete it.