On Sep 18, 2018, at 3:46 PM, Thananon Patinyasakdikul <tpati...@vols.utk.edu> 
> I tested on our cluster (UTK). I will give a thumb up but I have some 
> comments.
> What I understand with 4.0.
> - openib btl is disabled by default (can be turned on by mca)

It is disabled by default *for InfiniBand*.  It is still enabled by default for 
RoCE and iWARP.

> - pml ucx will be the default for infiniband hardware.
> - btl uct is for one-sided but can also be used for two sided as well (needs 
> explicit mca).
> My question is, what if the user does not have UCX installed (but they have 
> infiniband hardware). The user will not have fast transport for their 
> hardware. As of my testing, this release will fall back to btl/tcp if I dont 
> specify the mca to use uct or force openib. Will this be a problem? 

This is a question for Mellanox.

Jeff Squyres

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