Re: [matplotlib-devel] Experiments and questions / OpenGL backend

[Michael D. <md...@st...>]

Have you tried running it in the Python profiler?  I find this script 
[1] in combination with kcachegrind to be very useful in answering these 
kinds of questions.

[1] http://codespeak.net/pypy/dist/pypy/tool/lsprofcalltree.py

Mike

On 07/28/2011 07:16 AM, Nicolas Rougier wrote:
>
>
> I've created a fork at: 
> https://github.com/rougier/matplotlib/tree/gl-backend
>
> The name of the backend is glut (it requires OpenGL) and does not 
> display anything, it only measures fps.
>
> It seems to be stuck at 100fps with the following test script:
>
> import matplotlib
> matplotlib.use('glut')
> from pylab import *
> plot([1,2,3])
> show()
>
> while the same do-nothing window directly in pyOpenGL is around 
> 2000fps on the same machine.
>
> I would like to understand why this is so slow and if it can be fixed.
>
>
>
> Nicolas
>
>
>
>
>
>
> On Jul 27, 2011, at 3:28 PM, Benjamin Root wrote:
>
>>
>>
>> On Wednesday, July 27, 2011, Nicolas Rougier 
>> <Nic...@in... <mailto:Nic...@in...>> wrote:
>> >
>> >
>> > Hi all,
>> >
>> > I've been testing various idea around the idea of a GL backend, and 
>> I would have a few questions.
>> > First, I tried to use the backend template to quickly test an empty 
>> pyglet backend and I've been quite surprised by the bad 
>> performances. Without drawing anything, I can hardly reach 100FPS and 
>> I wonder if I did something wrong ? (The backend is 
>> available backend_pyglet.py 
>> <http://www.loria.fr/~rougier/tmp/backend_pyglet.py 
>> <http://www.loria.fr/%7Erougier/tmp/backend_pyglet.py>> and the test 
>> file is at test_backend_pyglet.py 
>> <http://www.loria.fr/~rougier/tmp/test_backend_pyglet.py 
>> <http://www.loria.fr/%7Erougier/tmp/test_backend_pyglet.py>>)
>> >
>> > Second, I've been experimenting with proper anti-alias technics 
>> (using shaders) and the results are not so bad so far (IMHO) :
>> > Antialiased line with thickness varying by 0.1 pixels:
>> > http://www.loria.fr/~rougier/tmp/aa-line.png 
>> <http://www.loria.fr/%7Erougier/tmp/aa-line.png>
>> > (don't paid attention to the cap, it's not done yet)
>> >
>> > Antialiased circles (small circles position is increased by 0.1 pixels)
>> > http://www.loria.fr/~rougier/tmp/aa-circle.png 
>> <http://www.loria.fr/%7Erougier/tmp/aa-circle.png>
>> > (I can post source code if anyone is interested)
>> > I don't know yet if all matplotlib artists can be drawing using 
>> these technics.
>> >
>> > My question relates to the cairo backend that now seems to support 
>> gl and shaders. Does anyone know the status of the gl-backend and how 
>> it would improve performances of matplotlib ? (I had a hard time 
>> finding any information).
>> >
>> > Nicolas
>>
>> Nicolas,
>>
>> I want to immediately encourage you to continue on your efforts. 
>>  PLEASE make a fork on github so that we may be able to experiment 
>> better.
>>
>> Cheers!
>> Ben Root 
>
>
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-- 
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA