performance work

[Greg Smith]

Hi Jordan,

Looks like we made a little more progress on graphics benchmarking. See 
Neil's results below.

I updated the feature page with the test results so far:
http://wiki.laptop.org/go/Feature_roadmap/General_UI_sluggishness

What's next?

Do we know enough now to target a particular section of the code for 
optimization?

Thanks,

Greg S

*******************

Subject: Re: performance work
To: Wade Brainerd <wadetb at gmail.com>
Cc: OLPC Development <devel at lists.laptop.org>, greg at laptop.org
Message-ID: <494E16AA.3070503 at skierpage.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Wade Brainerd wrote:
On Tue, Dec 16, 2008 at 7:08 PM, Neil Graham <Lerc at screamingduck.com

 > >     Is there a build of cairo that can produce a log of what calls 
are used
 > >     in typical XO use?

http://www.cairographics.org/FAQ/#performance_concerns says
"Cairo provides a cairo-trace utility (currently only available from the
git development tree, but is planned for inclusion with Cairo 1.10)"
(I think Joyride builds include Cairo 1.8.0, latest released Cairo is 1.8.6)

 > > Some good ways to find out are located here:
 > >
 > > http://wiki.laptop.org/go/Performance_tuning

I mentioned this.

--
=S

**********
Neil said:
 > I recommend running the Cairo benchmarks on the XO again with
 > acceleration turned off in the X driver. This will give you a good
 > indication of which operations are being accelerated and which are not.

Done.

http://screamingduck.com/Cruft/cairo_benchmark_XO_NoAccel.txt


At a cursory glance it looks like an overall improvement without
acceleration except for lines-xlib, add-xlib and over-xlib