[ofiwg] AF_UNIX,SOCK_DGRAM for shared memory signaling

[Hefty, Sean]

> I didn't bring it up on the call because I wanted to check on a couple of
> semantics, but I think you could just use a single
> "socket(AF_UNIX,SOCK_DGRAM,0)" socket per endpoint RX context.  This should
> scale -- it doesn't blow up as O(P^2) like RC QPs / SOCK_STREAM sockets /
> named pipes would.  You could expose that UNIX domain socket fd directly to
> the libfabric application or you could shove it into an epoll set and then
> the app would be given the epoll instance's FD.

Thanks - I was leaning toward SOCK_DGRAM as well, though I hadn't thought of AF_UNIX.

- Sean