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

[Murray Trainer]

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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