Just an update on this
I tested the recommendation below and got 12fps with glxgears. For reference 
on the actual display on machine b I get over 29000fps.

I wrote a script that fools vglrun into thinking it is talking to X on ":0" 
but is actually talking to socket on machine b over tcp. that got 80fps.

I am working with a programmer friend. He is looking at making a modified 
version of vglrun that speaks native IB calls in doing it's communication from 
machine c to machine b. I will keep you posted.


On Friday Friday 18 June 2010 3:10 pm DRC wrote:
> You could possibly run the application and VirtualGL on Machine C and
> display the output to Machine A via the VGL Transport or TurboVNC but
> then set VGL_DISPLAY on Machine C to the X display of Machine B, e.g.:
> 
> machine_a>  vglconnect machine_c
> machine_c>  export VGL_DISPLAY=machine_b:0.0
> machine_c>  vglrun my_application
> 
> or
> 
> machine_a> ssh machine_c
> machine_c> /opt/TurboVNC/bin/vncserver
> machine_a> /opt/TurboVNC/bin/vncviewer machine_c:1
> machine_c (in VNC session)> export VGL_DISPLAY=machine_b:0.0
> machine_c (in VNC session)> vglrun my_application
> 
> The security issues with this are numerous.  You would have to enable
> X11 TCP connections on machine_b and then open up machine_b's X server
> to machine_c using xhost or create an xauth key that can shared to all
> users of machine_c.
> 
> Also, this method will use an indirect OpenGL connection between
> machine_c and machine_b to do the rendering, which isn't really what
> VirtualGL was designed to do (it will complain about this.)  The only
> reason why it might work OK is that the two machines are connected with IB.
> 
> You may also run into issues of mismatched OpenGL client and server
> libraries.  machine_c presumably has Mesa installed, whereas machine_b
> is using NVIDIA's OpenGL implementation.  I don't know whether VirtualGL
> will like having to pull OpenGL functions from Mesa (this hasn't been
> tested), and I don't know whether Mesa will be able to communicate
> properly over the network to the NVIDIA libraries to do things like
> creating Pbuffers.
> 
> Let me know if it works.
> 
> On 6/18/10 12:27 PM, Nate Fuhriman wrote:
> > I have a the following weird situation. Can you let me know if it is
> > possible to setup virtualgl this way and if it is some basic
> > instructions on how to do it.
> > 
> > I have Machine A, B, C
> > 
> > Machine A is the machine with the actual monitor connected that I want to
> > see output on.
> > 
> > Machine B is machine with a nvidia graphics card but not much memory and
> > comparatively slow cpus.
> > 
> > Machine C has fast processors with lots of memory but no way to install
> > graphics card (Blade)
> > 
> > Machine B and Machine C have QDR Infiniband connection to each other.
> > 
> > Machine A has Gigabit connection over lan to machine B and C
> > 
> > Is there a way to Display on machine A. have GL rendered on machine B and
> > have the application run on machine C where it has the room to do it's
> > calculations.
> > 
> > Thanks in advance.
> > Nate
> > 
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