I tried your program on a single node and it worked fine. Yes, TCP message passing in Open MPI has been working well for some time. I have a few suggestions. 1. Can you run something like hostname successfully (mpirun -np 10 -hostfile yourhostfile hostname) 2. If that works, then you can also run with a debug switch to see what connections are being made by MPI.
I would suggest reading through here for some ideas and for the debug switch. http://www.open-mpi.org/faq/?category=tcp Rolf >-----Original Message----- >From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] >On Behalf Of Don Armstrong >Sent: Thursday, May 03, 2012 2:51 PM >To: us...@open-mpi.org >Subject: [OMPI users] MPI over tcp > >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 ----------------------------------------------------------------------------------- This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. -----------------------------------------------------------------------------------
