On Oct 20, 2015, at 5:26 PM, Ralph Castain <r...@open-mpi.org> wrote: > > Understood - but can we narrow it down a bit? Specifically, do we need both > BTL and MTL access to the same network?
That's what I'm saying: for usnic, I don't know yet (we haven't finished our tag matching implementation yet). I suspect there will be benefits/tradeoffs for each. > This would cut the combinations by 2x right away. Then we could potentially > remove the network-specific MTLs. > > Then we just have to deal with UCX vs libfabric - so only the two decision > levels (UCX vs libfabric, network) It's not just UCX and libfabric: there's the openib BTL, for example. uGNI is similar -- it has it's own BTL, but it will also be available via libfabric. Portals has a BTL and an MTL, too. -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
