On Oct 20, 2015, at 4:49 PM, Ralph Castain <r...@open-mpi.org> wrote:
> 
> Your last point about the qualifiers is kinda what I was hinting at in my 
> note. If you have usnic support via the OFi MTL, why do you also need it as a 
> BTL? The BTL needs libfabric anyway, yes? So is there some value in having 
> both methods?

Maybe, maybe not.  I don't know yet.

Likely, there will be benefits/tradeoffs to each path.

> Same question for PSM and PSM2, and probably others I imagine. Do we really 
> need all these multiple ways?

MXM is the same category.

UCX will add additional combinations to get the same underlying network, too.

So if both libfabric and UCX get market penetration, we'll *have* to address 
the issue of having multiple API paths to get to the same underlying network.

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