[petsc-dev] sor smoothers

[Barry Smith]

On Sep 9, 2013, at 4:32 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Barry Smith <bsmith at mcs.anl.gov> writes:
>>   I don't care if PCMGSetResidual stays around for now but I do not
>>   think we should "point to it" as a standard way for people to do
>>   things; I think we should improve how the two slots are used with
>>   PCMG, it really has never been thought about at all and whenever
>>   possible I think using the two slots appropriately is better than
>>   PCMGSetResidual and will solve most of the "use" cases.
> 
> Fine, I was just not eager to _delete_ PCMGSetResidual until we had
> established a complete replacement, and even then, it might be enough to
> leave it as "advanced" and suggest the preferred alternative in the man
> page.  It just doesn't seem expensive to support and I don't think it
> causes people to tangle themselves up in bad design.

  It doesn't have its own object which is kind of limiting.