RE: OpenGL performance
RE: OpenGL performance
- Subject: RE: OpenGL performance
- From: "Haroon Sheikh" <email@hidden>
- Date: Sun, 12 Jan 2003 17:24:31 -0800
As you may have gathered from other posts, OpenGL on X11 for Mac OS X is
currently limited to the display frequency. We have removed this
limitation and will be part of the next release.
haroon
-----Original Message-----
From: email@hidden
[mailto:email@hidden] On Behalf Of Haroon Sheikh
Sent: Tuesday, January 07, 2003 10:44 PM
To: John Iversen
Cc: email@hidden
Subject: Re: OpenGL performance
We'll look at this internally over the next week and get back.
haroon
On Tuesday, January 7, 2003, at 07:54 PM, John Iversen wrote:
> Hi,
>
> This is exciting, smart and much appreciated! Well done, Apple.
>
> My first impressions are very positive. Installation was painless,
> startup is very fast, window manager is well integrated. However, what
> I really care about is rendering speed, and I'm not so sure that's up
> to snuff...
>
> Has anyone done any benchmarking of OpenGL performance? I haven't seen
> the blazing performance I expected, particularly given the tight
> quartz integration, and direct mode rendering mentioned on the web
> site. Granted it's early, so can we expect performance gains in later
> versions? Is there something I can do differently?
>
> My own simple attempts to get a feeling for this are explained below:
>
> I used two benchmarks, 3D rendering in Matlab and glxgears.
> I'm comparing this 0.1 release to the top-of-tree build of XFree86
> (4.2.99.3), in which XDarwin (1.2a) uses accelerated OpenGL rendering,
> as well as an earlier release of XFree86 (4.2.1.1), which used Mesa
> for software-only OpenGL rendering. twm was the window manager in the
> XDarwin cases. For kicks, I also used twm with X11 0.1 instead of the
> quartz-wm to factor out the wm, but that didn't make any difference on
> the speed.
>
> On a 1GHz Powerbook:
>
> Matlab 'bench' 3D score
> Apple X11 0.1 1.44 sec
> (Apple X11 0.1 + twm 1.41 s)
> XFree86 4.2.99.3 1.06 s
> XFree86 4.2.1.1 ~3-4 s
>
> glxgears
> Apple X11 0.1 ~60 fps
> XFree86 4.2.99.3 ~60 fps
> XFree86 4.2.1.1 ~120 fps
>
> Now, suggestions for better benchmarks are certainly appreciated, but
> this is not what I was expecting, particularly the 36% hit in Matlab.
> I don't really know how all of this compares to X11 implementation on
> other platforms, nor what to ultimately expect for this machine, but I
> suspect it leaves room for improvement. (The matlab test involves more
> than just openGL performance, so it's hard to compare, but the best
> score they have listed is around 0.5 s on a fairly stacked PC. I've
> seen glxgears results in the many hundreds to thousands of fps.)
>
> I'd be interested in any thoughts and others' experience.
>
> Thanks,
>
> John
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