David Doria wrote: > 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 >
I'm a newbie, so forgive me if I ask something stupid: why are You running ssh command before mpirun command? I'm interested in setting up a paraview server on a LAN to pos-tprocess OpenFOAM simulation data. Just a total newbish comment: doesn't the mpirun in fact call for the ssh anyway? And if pvserver is to be run on multiple machines and is programmed in Open MPI shouldn't mpirun -np procNumber -H host1,host2,host3 pvserver be enough to get it going, as well as any other parallel program? Again, please excuse my newbiness. Best regards, Tomislav
