On Dec 1, 2014, at 12:47 PM, Ralph Castain <r...@open-mpi.org> wrote:

> I’m not entirely familiar with the thinking behind it, but it appears that 
> some MCA params are intended solely for reporting purposes and are therefore 
> not really “settable”. The “have_knem_support” is one such example, and it 
> sounds like you may have found some others.

Correct.  We call these "info" MCA params.  They've been around for a long, 
long time, but I think they may have gotten renamed (at least in the output) in 
the MCA revamp in the 1.7/1.8 series.

Perhaps we need less confusing output in this area.

-- 
Jeff Squyres
jsquy...@cisco.com
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