[ofa-general] Connection timeout on localhost (using libsdp)

[Chris Tilt]

Hello,

I am very hopeful of getting libsdp working with an existing application. Specifically, I am trying to port Erlang to use SDP for it's "distributed Erlang" mechanism. With LD_PRELOAD, this may be very easy. However, I am having trouble with one of it's daemon processes (a port map deamon called "epmd"). Conceptually, it's a very simple C program that runs either as a daemon or as a client that connects to the daemon to do queries. To be sure that I was getting SDP, I changed the source to use AF_INET_SDP by actually looking up that value in the include files (it was 27) and substituting that in place of AF_INET. I started the process as a daemon with debugging on and it reported as normal "listening on port...". When I tried running it as a client, it attempted to connect to the known port on "localhost" and got a "Connection timeout" as reported by perror(2).

Ideas?

Cheers, Chris

P.S. There are many users of Infiniband that would dearly love to see distributed Erlang running FAST on their systems, so this would potentially help a lot of customers! Thanks for your help.
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