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Re: java applications on thinclients don't work smoothly

On Wed, May 12, 2010 at 01:09:27PM +0200, Philipp Huebner wrote:

On 12.05.2010 12:57, Jonas Smedegaard wrote:
Well, if you were simply describing a situation, not asking any
questions, then no wonder my response is confusing.

the clear and exact question should have been: how can I improve the problematic (java) behaviour when using ThinClients ?


Do I then understand it correctly that you answered your own question yourself?:

On Wed, May 12, 2010 at 12:43:41PM +0200, Philipp Huebner wrote:
At least for the java part I got a working solution:

It still seems to me that the issue you are raising (solved or not) is somewhat related to MIT-SHM: As I understand your reference, Java by default uses OpenGL for rendering but some options can make it instead use XRender.

Only when X11 apps are invoked on same host as the X11 screen(s) can MIT-SHM and DRI be used to speedup graphics rendering.

DRI is required for (most) hardware-accelerated OpenGL.

In other words: the main speed-killers for remote X11 execution (e.g. "diskless clients") are

 * Use of OpenGL (since it is non-accelerated software emulation)
 * Heavy use of MIT-SHM

When I (years ago) maintained a lessdisks network in the ecovillage I lived in, I carefully removed all games and tools using OpenGL.

I might be wrong that the lack of OpenGL acceleration is only due to my machines not having graphics cards with DRI support.

Hope this info is of some use to someone, soemwhere.

 - Jonas

* Jonas Smedegaard - idealist & Internet-arkitekt
* Tlf.: +45 40843136  Website: http://dr.jones.dk/

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