On Wed, Oct 13, 2010 at 12:43:31PM -0000, Naty Bidart wrote: > HI Steve, thanks for your answer.
> Can you please detail how can I measure/see this polling you're > referring to? The service will not shutdown by itself, but is not doing > any explicit polling either. If you run 'sudo powertop' in a terminal, this will show the top causes of system wakeups. On a system that has ubuntu-sso-login running, it shows up for me with a steady 10.0 wakeups per second. You may want to make your terminal taller if you have a busy system with lots of other causes of wakeups; but you'll probably notice that all of the higher causes for wakeups are either the kernel / hardware, or applications that you're actively using, not background services that should be idle. The most likely causes for wakeups (at the C/syscall level) would be some sort of sleep/usleep call, or a select() with an unreasonably short timeout. Mapping this to python code is somewhat trickier; as a general rule, it's important for any application to consolidate as many of its timers as possible into a single timer, so that it can, say, wake up once a second, do its work, and put the CPU back to sleep. I was looking for a good reference to power-efficient desktop programming since I know such things have been written, especially for GNOME; but I'm coming up empty at the moment. However, I did find <https://bugzilla.redhat.com/show_bug.cgi?id=239893>, which describes a similar "10/sec" wakeup problem with another PyGTK app, so maybe that will provide some clues here? BTW, what's the reason for the service not shutting itself down after an idle timeout? I thought this was fairly standard practice for dbus services. Thanks, -- Steve Langasek Give me a lever long enough and a Free OS Debian Developer to set it on, and I can move the world. Ubuntu Developer http://www.debian.org/ slanga...@ubuntu.com vor...@debian.org ** Bug watch added: Red Hat Bugzilla #239893 https://bugzilla.redhat.com/show_bug.cgi?id=239893 -- ubuntu-sso-login responsible for an unreasonable number of CPU wakeups, despite having nothing to do https://bugs.launchpad.net/bugs/658957 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
