I inadvertently noted that btl/uct has the highest exclusivity and consider all procs are reachable.

As a consequence :

 - btl/uct is used in altogether with btl/vader for intra-node communications

 - btl/uct is used altogether with btl/self for self communications

This behaviour is likely suboptimal and could/should be changed.

Can you please provide directions (uct vs self, and uct vs vader) ?

Once the policy is decided, the changes are trivial and I will be happy to issue a PR.



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