[libfabric-users] pingpong example

[Rob Latham]

Jeff made this list at my request so I guess I'll break the ice.

It's been 15 years since I've thought about low-level network 
programming (thanks MPI!) so I'm probably doing something obviously dumb 
here:

I extracted the pingpong example out of the OFI SC 2015 tutorial (this 
one: http://www.slideshare.net/dgoodell/ofi-libfabric-tutorial?ref=) 
got it compiling, added error checking.  I've attached the program.

I'm just playing around on my laptop, so this is with sock.  If I give a 
different source and destination, it hangs:

-  ./pingpong -s localhost:12345 -z 1024 -i 10
-  ./pingpong -d localhost:54321 -z 1024 -i 10

but if I give it the same source and destination, it runs.

- ./pingpong -s localhost:12345 -z 1024 -i 10
- ./pingpong -d localhost:12345 -z 1024 -i 10

Why is pingpong confused when source and dest are different?  I thought 
the steps on slides 79-81 were where the client and server tell each 
other where to look ?

Thanks
==rob

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