[FreeNX-kNX] Forcing the graphical applications to use the server-side graphics abilities

[Prakash Velayutham]

Hi,

Cool. I was actually looking at VirtualGL just yesterday. That thread  
was useful, but there was no closure, so I hope to hear back from  
either Darrell or Fabian.

Thanks,
Prakash

On Mar 19, 2009, at 9:16 PM, Murray Trainer wrote:

> Hi Prakash,
>
> There was a thread on this list titled "[FreeNX-kNX] NX performance  
> issue" starting 3/10/07.  I am not sure if there were any results?   
> Perhaps a developer can update us all on the status of this.
>
> Thanks
>
> Murray
>
>
>> Hi there.  I develop an open source application (http://www.virtualgl.org 
>> )
>> which adds hardware-accelerated 3D capabilities to X proxies such  
>> as NX,
>> VNC, etc.  It works by rerouting the 3D rendering into a Pbuffer on  
>> the
>> server's graphics card, reading it back, and drawing it into the X  
>> proxy
>> using XShmPutImage() or using X pixmap drawing (if XShm isn't  
>> available.)
>
>> The essential workload that VirtualGL produces is a stream of full- 
>> screen
>> (usually 1280x1024), back-to-back calls to XShmPutImage() or  
>> XCopyArea(),
>> depending on whether the MIT-SHM extension is available.
>
>> And now, the issue -- in either case, what I observe with NX is  
>> that this
>> workload will perform great for about 3-5 seconds, then it will  
>> slow to a
>> crawl and remain slow.  I've tried various quality settings,
>> enabling/disabling the bitmap caches, etc., and nothing seems to  
>> improve the
>> situation.  Is there something else I could try?  Or is there  
>> perhaps a way
>> to profile that system and determine what's causing it to slow  
>> down?  I
>> don't observe this slow-down with other X servers (TurboVNC,  
>> specifically,
>> or even just sending the pixels via. remote X on a gigabit  
>> connection.)
>
>> Darrell Commander
>
> ----- Original Message -----
> From: "Prakash Velayutham" <prakash.velayutham at cchmc.org>
> To: "User Support for FreeNX Server and kNX Client" <freenx-knx at kde.org 
> >
> Sent: Wednesday, March 18, 2009 12:15:01 PM GMT +08:00 Beijing /  
> Chongqing / Hong Kong / Urumqi
> Subject: [FreeNX-kNX] Forcing the graphical applications to use the  
> server-side graphics abilities
>
> Hello,
>
> If this question does not belong in this list, I would appreciate if
> you could direct me to the right list.
>
> I use FreeNX and NoMachine NX Client to connect to my cluster head
> node. Everything works fine, except that I want to make the following
> work:
>
> How can I make the graphical applications utilize the graphics
> processor on the server instead of on my NX client (which, in X terms
> is the X-server)?
>
> Thanks,
> Prakash
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