Without including the -x DISPLAY, glut doesn't know what display to open. For instance, without the -x DISPLAY parameter glut returns an error from each process stating that it could not find display "" (empty string). This strategy is briefly described in the openmpi FAQs<http://www.open-mpi.org/faq/?category=running#mpirun-gui> for launching gui applications with openmpi.
I'm assuming that by setting the DISPLAY envar to :0.0, each process will render to their local display, which is my intention, and as I previously stated works for up to 2 processes. So I believe it to be necessary. But I'm thinking I may have to configure some kind of X11 forwarding. I'm not sure... Thanks for your reply! Any more ideas? Brad On Mon, Dec 6, 2010 at 6:31 PM, Ralph Castain <r...@open-mpi.org> wrote: > Guess I'm not entirely sure I understand how this is supposed to work. All > the -x does is tell us to pickup an envar of the given name and forward its > value to the remote apps. You can't set the envar's value on the cmd line. > So you told mpirun to pickup the value of an envar called "DISPLAY=:0.0". > > So yes - I would expect this would be behaving strangely. > > If you tell us -x DISPLAY, we'll pickup the local value of DISPLAY and > forward it. What that will cause your app to do is, I suppose, up to it. > > > On Dec 6, 2010, at 12:42 PM, brad baker wrote: > > > Hello, > > > > I'm working on an mpi application that opens a glut display on each node > of a small cluster for opengl rendering (each node has its own display). My > current implementation scales great with mpich2, but I'd like to use openmpi > infiniband, which is giving me trouble. > > > > I've had some success with the -x DISPLAY=:0.0 parameter to mpirun, which > will open the display on up to 2 of my nodes... any 2. But when I attempt > to run the application on 4 nodes, the display is non-deterministic. If any > open at all process 0 definately will, and sometimes process 3 along with > that. I haven't observed much behavior from process 1 or 2. > > > > My command: > > > > mpirun -x DISPLAY=:0.0 -np 4 -hostfile ~/openmpi.hosts ./myapp > > > > I've tried adding the -d option with no success. > > > > Does anyone have any suggestions or comments? I'll certainly provide > more information if required. > > > > Thanks, > > Brad > > _______________________________________________ > > 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 >
