[PD] opengl performance on osX

cyrille henry ch at chnry.net
Mon May 23 13:32:38 CEST 2011

Le 23/05/2011 13:24, Nicolas Montgermont a écrit :
> Hello all,
> I didn't had time to make heavy testing.
> But I tried some things today and it seems finally I manage to go further than 50% of the GPU.
> You can see the evolution of my graph here if you want:
> http://nim.on.free.fr/data/gem_perf.png
> It is with different testing : changing resolution / frame / options
> Auto-hiding the dock doesn't seems to change a thing, and sending fullscreen before creating the window did not significantly change the GPU usage.
> I'll try to do some more professional testing with Cyrille tomorrow.
> What is the best way to test the GPU usage, drawing numerous squares?
when rendering many squares, the bottle neck is locate on the PCI bus, for the communication between cpu and gpu.
pure gpu computing can be tested with heavy shader usage.


> There is also many different parameters to monitor and i can display some others if you prefer.
> The tool i am using is a developper tool from apple : OpenGl Driver Monitor
> Nicolas
> Le 22/05/11 19:02, chris clepper a écrit :
>> Does the performance improve in fullscreen? I can see having to share time with the rest of the GUI, but in full screen there is nothing else taking time.
>> Sat, May 21, 2011 at 7:12 AM, cyrille henry <ch at chnry.net <mailto:ch at chnry.net>> wrote:
>>     hello,
>>     from my experience, Gem is 2 times faster on the same computer using ubuntu than osX.
>>     thanks to nvidia profiling tools, Nicolas pointed that gem is limited to 50% usage of the GPU.
>>     there is certainly a limitation somewhere on osX preventing application to use full performance of the hardware.
>>     so, you applications are slower, but the interface will always be smooth...
>>     Cyrille
> --
> http://nim.on.free.fr

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