I have three machines: mine (daviddoria) and two identical remote machines (cloud3 and cloud6). I can password-less ssh between any pair. The machines are all 32bit running Fedora 11. OpenMPI was installed identically on each. The .bashrc is identical on each. /etc/hosts is identical on each.
I wrote a test "hello world" program to ensure OpenMPI is behaving correctly. The output is exactly as expected, each node seems to be alive. [doriad@daviddoria MPITest]$ mpirun -H cloud6,daviddoria,cloud3 -np 3 hello-mpi Process 1 on daviddoria out of 3 Process 2 on cloud3 out of 3 Process 0 on cloud6 out of 3 I am trying to get a parallel application called Paraview working with these three machines. Paraview is installed identically on each. As a test, I wanted to get it working with two at a time first. With cloud3, everything goes smoothly, that is, I tell Paraview to start the server with ssh cloud3 mpirun -H cloud3 pvserver and to connect to the server on cloud3, and I get the following (expected) output: Listen on port: 11111 Waiting for client... Client connected. When I try the same thing on cloud6, it again goes smoothly (I tell Paraview to start the server with ssh cloud6 mpirun -H cloud6 pvserver and connect to the server on cloud6) Now for the real test... I tell Paraview to start the server with ssh cloud6 mpirun -H cloud6,cloud3 -np 2 pvserver and connect to the server on cloud6 This again connects successfully. However, if I do the reverse: ssh cloud3 mpirun -H cloud3,cloud6 -np 2 pvserver and connect to the server on cloud3 it tries and tries for 60 seconds but it can't connect. I just see a bunch of "Failed to connect to server on cloud3" errors. Does anyone have any idea what could cause this asymmetric behavior? Thanks, David
