Re: [OMPI users] x11 forwarding

[Dave Grote]

I'm using caos linux (developed at LBL), which has the wrapper wwmpirun around mpirun, so my command is something like wwmpirun -np 8 -- -x PYTHONPATH --mca pls_rsh_agent '"ssh -X"' /usr/local/bin/pyMPI This is essentially the same as mpirun -np 8 -x PYTHONPATH --mca pls_rsh_agent '"ssh -X"' /usr/local/bin/pyMPI but wwmpirun does the scheduling, for example looking for idle nodes and creating the host file. My system is setup with a master/login node which is running a full version of linux and slave nodes that run a reduced linux (that includes access to the X libraries). wwmmpirun always picks the slaves nodes to run on. I've also tried "ssh -Y" and it doesn't help. I've set xhost for the slave nodes in my login shell on the master and that didn't work. XForwarding is enabled on all of the nodes, so that's not the problem. I am able to get it to work by having wwmpirun do the command "ssh -X nodennnn xclock" before starting the parallel program on that same node, but this only works for the first person who logs into the master and gets DISPLAY=localhost:10. When someone else tries to run a parallel job, its seems that DISPLAY is set to localhost:10 on the slaves and tries to forward through that other persons login with the same display number and the connection is refused because of wrong authentication. This seems like very odd behavior. I'm aware that this may be an issue with the X server (xorg) or with the version of linux, so I am also seeking help from the person who maintains caos linux. If it matters, the machine uses myrinet for the interconnects.   Thanks!      Dave Galen Shipman wrote: what does your command line look like? - Galen On Nov 29, 2006, at 7:53 PM, Dave Grote wrote: I cannot get X11 forwarding to work using mpirun. I've tried all of the standard methods, such as setting pls_rsh_agent = ssh -X, using xhost, and a few other things, but nothing works in general. In the FAQ, http://www.open-mpi.org/faq/?category=running#mpirun-gui, a reference is made to other methods, but "they involve sophisticated X forwarding through mpirun", and no further explanation is given. Can someone tell me what these other methods are or point me to where I can find info on them? I've done lots of google searching and havn't found anything useful. This is a major issue since my parallel code heavily depends on having the ability to open X windows on the remote machine. Any and all help would be appreciated! Thanks! Dave _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users