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Re: Core Animation OpenGL Layer performance jitters
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Re: Core Animation OpenGL Layer performance jitters

On 02/11/2009, at 5:44 PM, David Duncan wrote:

I would imagine that you are using LCD panels, so refresh rate shouldn't be an issue (if you are using a CRT, try setting the refresh rate to 60Hz, although I don't expect to see much).
I am using LCD panels. I have also tried Plasma panels. The refresh rate is 60hz as that is all that is offered when connecting the displays. The displays are configured as a video wall with HDMI splitters. However I have also observed the problem when connecting one LCD panel to my MacBook Pro.

This is really sounding more and more like a fill rate or memory issue, especially since these two factors are what is most impacted by adding a second display.
I shall go forth and investigate fill rate and memory bottlenecks - though some clues here would be good! Are these things curable? ;-)

On 02/11/2009, at 7:41 AM, vade wrote:

How much vram do you have on your system, and are you running your second display on a high resolution?
I don't *think* vram is an issue. I've tried various cards and hardware with similar results. For example my MacBook Pro: NVIDIA GeForce 9400M, 256 MB.

My airport video wall consists of two virtual displays: one of 1280x720 and the other at 1920x1080.

Try it with mirroring on, and see if its still smooth,
Interesting idea. I am unable to try that right now, but the previous configuration of my displays was to two LCD panels each mirroring the display. Performance was smooth. However I was using 10.5 and I wasn't using CA - I used NSOpenGLView.

or try reducing the resolution on the second display, to see if its a fill rate, or vram 'thrashing' issue. I dont know the details of the implementation, and these are shots in the dark, but may help deduce the causes.
I appreciate the thoughts. There's that fill rate word again. :-)


Check GL monitor and look at your VRam and other datas to get some ideas of what 'delta's you are looking at between the two setups. May be enlightening.
OK. Good idea.

Kind regards,
Christopher
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