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Subject: [OMPI users] MPI over tcp
From: Don Armstrong (don_at_[hidden])
Date: 2012-05-03 14:51:16


I'm attempting to use MPI over tcp; the attached (rather trivial) code
gets stuck in MPI_Send. Looking at TCP dumps indicates that the TCP
connection is made successfully to the right port, but the actual data
doesn't appear to be sent.

I'm beginning to suspect that there's some basic problem with my
configuration, or an underlying bug in TCP message passing in MPI. Any
suggestions to try (or a response indicating that MPI over TCP
actually works, and that it's some problem with my setup) appreciated.

The relevant portion of the hostfile looks like this:

archimedes.int.donarmstrong.com slots=2
krel.int.donarmstrong.com slots=8

and the output of the run and tcpdump is attached.

Thanks in advance.

Don Armstrong

-- 
[T]he question of whether Machines Can Think, [...] is about as
relevant as the question of whether Submarines Can Swim.
 -- Edsger W. Dijkstra "The threats to computing science"
http://www.donarmstrong.com              http://rzlab.ucr.edu