[Paraview] HW acceleration in client/server mode

[Sean Ziegeler, Contractor]

You should check to be sure that you do indeed have DISPLAY set to :0.0
on each node and that you have authority for the X-Servers.  It sounds
like your MPI configuration uses rsh to execute its processes, so to
test this for some node, do the following:
rsh somenode xlogo

If DISPLAY really is :0.0, then the xlogo should appear on the display
for that node (I'm assuming you have some way of verifying that node's
video output).  

If you get a "Can't open display: " (with no display value after the
color) error, then DISPLAY is not actually getting set.  You'll have to
be sure it is set in the appropriate .login/profile/cshrc/bashrc/etc for
your shell, or you can pass environment variables on the mpirun command
line.

If you get a "connection to :0.0 refused by server" error, then you
don't have authority for the X-Server.  The quick fix is running "xhost
+" or "xhost +localhost" from the console of each node.  Or you can use
xauth to gather the X-Authority data from each node (much more involved,
but also more secure).

-Sean

On Wed, 2006-07-05 at 07:25, Alain SENOT wrote:
> I'm using Paraview 2.4.3 in client-server mode on a little linux
> cluster with graphic cards.
> I'm using mpich 1.2.7 and compiled with the settings of the following
> variables :
> VTK_USE_MPI  on
> MPI LIBRARY  
> MPI INCLUDE PATH
> MPI EXTRA LIBRARY
> MPI EXECUTABLE mpirun
> CMAKE C COMPILER mpicc
> CMAKE CXX COMPILER mpicxx
> 
> Then I copied the files of Paraview and MPI on other nodes of the
> cluster. 
> 
> When I launch the application in client-server mode, a warning message
> appears, telling me that I won't be able to use compositing.
> "To enable compositing, compile and run the server with offscreen Mesa
> support or assign a valid display to all server nodes."
> 
> For obvious reason, I would like to choose the second solution.
> 
> How can I assign a valid display to all server nodes so that the
> server can render ?
> The DISPLAY environment value is :0.0 on all nodes for the user.
> The ~/.rhosts file lists all nodes. mode 700. The UID of the user is
> the same on all nodes.
> MPIRUN has been added to the PATH variable, MPI libs to
> LD_LIBRARY_PATH.
> The machine list file contains the machines of the server.
> 
> Thanks again for your help,
> 
> Alain Senot
> EDF
> 
> 
> >Message: 3
> >Date: Mon, 3 Jul 2006 15:53:34 -0400
> >From: "Berk Geveci" <berk.geveci at gmail.com>
> >Subject: Re: [Paraview] HW acceleration in client/server mode
> >To: "Alain SENOT" <alain.senot at edf.fr>
> >Cc: paraview at paraview.org
> >Message-ID:
> >                
> <a2ab21560607031253o23ebd97ft6c643b938ad4773c at mail.gmail.com>
> >Content-Type: text/plain; charset="iso-8859-1"
> >
> >Take a look at this post:
> >http://public.kitware.com/pipermail/paraview/2006-July/003366.html
> >
> >The users guide has a longer description of ParaView's architecture.
> >
> >
> >-Berk
> >
> >On 7/3/06, Alain SENOT <alain.senot at edf.fr> wrote:
> >>
> >>
> >> Hi everybody,
> >>
> >> I would like to know (if it is possible/how) to use the hardware
> >> acceleration on the server in client/server mode.
> >>
> >> Thanks
> >>
> >> Alain Senot
> >> EDF
> 
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