Re: [VirtualGL-Users] Single application runs very slow with VirtualGL/TurboVNC while others run fine

[Dan P. <ph...@cs...>]

On Apr 24, 2008, at 4:51 AM, Reiner Rottmann wrote:
> Hello,
>
> currently we are evaluating latest versions of VirtualGL together with
> TurboVNC on RHEL 4U6 in order to allow engineers to access certain CAD
> software on a remote server.
>
> As a testmachine we use a dedicated server with Intel quadcore CPU,  
> 2GB RAM
> and a decent Nvidia grafics card.
>
> Our first tests were with regular LAN speed 100 Mbit/s, later we  
> used a slower
> broadband connection to a subsidiary.
>
> Most applications did run quite well. For example Ansys Workbench  
> [1] or Ansys
> CFX [2].
>
> However one application that also uses OpenGL for 3D accelleration,  
> Ansys ICEM
> CFD [3], was very slow and there was a huge lag even in the local area
> network, while other applications that use 3D accelleration at  
> least in the
> same magnitude worked fine. Also tests on the real X-Window desktop  
> showed
> that the server has no problems with either application to run  
> fluently.
>
> No we want to dive deeper into this issue to isolate the root cause as
> VirtualGL otherwise seems to do a perfect job.
>
> My Questions are:
>

i can only answer a couple of these...

> - Is there a way to further debug a VirtualGL session?

try these:
vglrun -h
   +/-tr     : Enable/disable function call tracing (generates a lot  
of output)
   +/-v      : Enable/disable verbose VirtualGL messages

> - What are the most prominent sources of error why this one  
> application is
> still slow?

do you know if network or cpu was the bottleneck?

> - Are there any general tipps to further increase overall performance?
> - Is there any practical experience how many users may use VirtualGL
> simultanously?

this is a good source of info:
http://www.virtualgl.org/pmwiki/uploads/About/vglperf21.pdf

> - Is there a way to utilize multiple cpu cores, as rotating an  
> object seems to
> produce 100% cpu usage on one core for a short period of time (ssh  
> process)?
> - Is there also a commercial support for VirtualGL/TurboVNC available?
>
> Best regards,
> Reiner Rottmann
>
> [1] http://www.ansys.com/products/workbench.asp
> [2] http://www.ansys.com/products/cfx.asp
> [3] http://www.ansys.com/products/icemcfd.asp
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