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Subject: Re: [OMPI users] Problem with X forwarding
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-06-04 14:36:00


In general, Open MPI doesn't have anything to do with X forwarding.
However, if you're using ssh to startup your processes, ssh may
configure X forwarding for you (depending on your local system
setup). But OMPI closes down ssh channels once applications have
launched (there's no need to keep them open), so any X forwarding that
may have been setup will be closed down.

The *easiest* way to setup X forwarding is simply to allow X
connections to your local host from the node(s) that will be running
your application. E.g., use the "xhost" command to add the target
nodes into the access list. And then have mpirun export a suitable
DISPLAY variable, such as:

export DISPLAY=my_hostname:0
mpirun -x DISPLAY ...

The "-x DISPLAY" clause tells Open MPI to export the value of the
DISPLAY variable to all nodes when running your application.

Hope this helps.

On May 30, 2008, at 1:24 PM, Cally K wrote:

> hi, I have some problem running DistributedData.cxx ( it is a VTK
> file ) , I need to be able to see the rendering from my computer
>
> I, however have problem running the executable, I loaded both the
> executabe into 2 machines
>
> and I am accesing it from my computer( DHCP enabled )
>
> after running the following command - I use OpenMPI
>
> mpirun -hostfile myhostfile -np 2 -bynode ./DistributedData
>
> and I keep getting these errors
>
> ERROR: In /home/kalpanak/Installation_Files/VTKProject/VTK/Rendering/
> vtkXOpenGLRenderWindow.cxx, line 326
> vtkXOpenGLRenderWindow (0x8664438): bad X server connection.
>
>
> ERROR: In /home/kalpanak/Installation_Files/VTKProject/VTK/Rendering/
> vtkXOpenGLRenderWindow.cxx, line 169
> vtkXOpenGLRenderWindow (0x8664438): bad X server connection.
>
>
> [vrc1:27394] *** Process received signal ***
> [vrc1:27394] Signal: Segmentation fault (11)
> [vrc1:27394] Signal code: Address not mapped (1)
> [vrc1:27394] Failing at address: 0x84
> [vrc1:27394] [ 0] [0xffffe440]
> [vrc1:27394] [ 1] ./
> DistributedData(_ZN22vtkXOpenGLRenderWindow20GetDesiredVisualInfoEv
> +0x229) [0x8227e7d]
> [vrc1:27394] [ 2] ./
> DistributedData(_ZN22vtkXOpenGLRenderWindow16WindowInitializeEv
> +0x340) [0x8226812]
> [vrc1:27394] [ 3] ./
> DistributedData(_ZN22vtkXOpenGLRenderWindow10InitializeEv+0x29)
> [0x82234f9]
> [vrc1:27394] [ 4] ./
> DistributedData(_ZN22vtkXOpenGLRenderWindow5StartEv+0x29) [0x82235eb]
> [vrc1:27394] [ 5] ./
> DistributedData(_ZN15vtkRenderWindow14DoStereoRenderEv+0x1a)
> [0x82342ac]
> [vrc1:27394] [ 6] ./
> DistributedData(_ZN15vtkRenderWindow10DoFDRenderEv+0x427) [0x8234757]
> [vrc1:27394] [ 7] ./
> DistributedData(_ZN15vtkRenderWindow10DoAARenderEv+0x5b7) [0x8234d19]
> [vrc1:27394] [ 8] ./DistributedData(_ZN15vtkRenderWindow6RenderEv
> +0x690) [0x82353b4]
> [vrc1:27394] [ 9] ./
> DistributedData(_ZN22vtkXOpenGLRenderWindow6RenderEv+0x52) [0x82245e2]
> [vrc1:27394] [10] ./DistributedData [0x819e355]
> [vrc1:27394] [11] ./
> DistributedData(_ZN16vtkMPIController19SingleMethodExecuteEv+0x1ab)
> [0x837a447]
> [vrc1:27394] [12] ./DistributedData(main+0x180) [0x819de78]
> [vrc1:27394] [13] /lib/libc.so.6(__libc_start_main+0xe0) [0xb79c0fe0]
> [vrc1:27394] [14] ./DistributedData [0x819dc21]
> [vrc1:27394] *** End of error message ***
> mpirun noticed that job rank 0 with PID 27394 on node .... exited on
> signal 11 (Segmentation fault).
>
>
> Maybe I am not doing the xforwading properly, but has anyone ever
> encountered the same problem, it works fine on one pc, and I read
> the mailing list but I just don't know if my prob is similiar to
> their, I even tried changing the DISPLAY env
>
>
> This is what I want to do
>
> my mpirun should run on 2 machines ( A and B ) and I should be able
> to view the output ( on my PC ),
> are there any specfic commands to use.
>
>
>
>
>
>
>
>
>
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users

-- 
Jeff Squyres
Cisco Systems