On Tue, 2007-03-06 at 01:55 -0800, Neal Norwitz wrote: > On 3/6/07, Marco Pesenti Gritti <[EMAIL PROTECTED]> wrote: > > On Mon, 2007-03-05 at 23:16 -0800, Neal Norwitz wrote: > > > > > Is any code that is known to have perf problems? I can code review > > > for problems. > > > > Well, we have performance issues almost everywhere, both in sugar and in > > the activities. AFAIK they are not python related though. The > > bottlenecks are usually the X server and cairo. > > > > The only cases I know where python might be involved are: > > > > * Activities startup. Just "import gtk" is taking a few seconds. (Though > > the maemo people which did some research and work on it was blaming it > > on the bindings itself, which requires to link a huge number of symbols > > at startup) > > One thing I noticed on my version (still Python 2.4). sys.path > (PYTHONPATH) contained some extra directories. This increases the > cost of imports if they hit the file system. This isn't usually > noticeable on local file systems, but painful on NFS. I don't know > about the XO hardware.
Right. We are uncertain how much that affects performance on the XO in real... We need to measure. > > > * Frame animation. We have between 20% and 40% percent of CPU usage in > > python. I have not tried to profile it yet but it might very well be > > cairo. > > * Activity startup animation. We are currently redrawing the whole > > activities donut there, for every animation frame. We can optimize to > > avoid that, but still it seem really too slow. We are doing a few > > math.sin/cos there, I wonder if they are at least partially to blame. > > > > Just brainstorming. We really need to have someone spend time profiling > > to find the actual bottlenecks. > > This is good to know. While I have a lot of knowledge about the > Python core, I can easily look at these other issues. Known issues > are the best place to start. Best guesses help too! > Awesome! > More questions: > * Do we have a wiki that keeps track of the biggest priorities or > things that need the most help? We don't, but it would be useful to have one. I think the biggest priority are in order: * Browser perfomance especially page scrolling (not related to python at all but...) * Activities startup time. * Frame animation performance. * Activities startup animation performance (it is run at a very very low fps right now to not create problem, but it should really be increased). > * Are there known ways to reproduce the problems? Yeah, if you want to attack any of these, I can help you out reproduce. And we should put the info on the wiki then. > * Are these slowdowns noticeable/measurable on faster machines or > only on the actual XOs? > Only on the XOs. > I have an XO laptop. However it might be a problem to build binaries > as my desktop is an amd64? I was able to do a complete build on > Ubuntu (although the wiki says it doesn't work). I had to add a > dependency on libncurses-dev and I added that note to the wiki page. > I haven't tried to run/test anything yet. We are usually using the images to do testing on the XO. We can get patches in for testing, once we have a good hope they will actually help out. Just testing random stuff out is quite painful atm though, for compiled code. I usually build on my box and then copy over the changed bin/library. I think we really need an image with development tools on it. Marco _______________________________________________ Sugar mailing list [email protected] http://mailman.laptop.org/mailman/listinfo/sugar
