[petsc-dev] petsc/petsc added -pc_use_amat option to PCSetFromOptions() (commit b9ee023)

Shri abhyshr at mcs.anl.gov
Sat Mar 23 11:40:46 CDT 2013

   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.

On Mar 23, 2013, at 11:25 AM, Jed Brown wrote:

> On Fri, Mar 22, 2013 at 10:14 AM, Mark F. Adams <mark.adams at columbia.edu> wrote:
> I thought the primary mission of options_left was to catch spelling mistakes.
>> (This is also useful if a PC logically ought to pay attention to this option, but isn't.) What about making PCSetUseAmat() use PetscTryMethod() and move the check of "-pc_use_amat" into each implementation?
> I agree with Barry that it should be high level and make it there for any PC to use if they want.
>> Do we really want to leave the confusing option in place for all the PCs that don't have inner solvers?
> It just doesn't seem that bad to me.
> Okay, okay, I'll stick with the simple thing.
> What about "-pc_reuse"? It is only referenced in src/ksp/pc/impls/factor/lu/lu.c and it doesn't have an API. Can it be removed entirely? I thought we were using SAME_PRECONDITIONER for this sort of thing.

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