Red Hat Bugzilla – Bug 204946
yum-updatesd wakes up every 100 msec even when doing nothing
Last modified: 2014-01-21 17:55:23 EST
Description of problem:
yum-updatesd keeps waking up 10 times per second while it's idle. This is
obviously not a good idea, it eats compute and battery power for absolutely no
To check this, just do
strace -tt -p <pid of python that runs the updated>
I've not yet been able to find where this is coming from but FC6 really
shouldn't ship with this one
/* Python only invokes signal handlers from the main thread,
* so if a thread other than the main thread receives the signal
* from the kernel, PyErr_CheckSignals() from that thread will
* do nothing. So, we need to time out and check for signals
* regularily too.
* Also, on Windows g_poll() won't be interrupted by a signal
* (AFAIK), so we need the timeout there too.
*timeout = 100;
Right, it happens that when thread awareness is enabled in pygobject, the 100ms
timeout is used.
This used to be upstream bug http://bugzilla.gnome.org/show_bug.cgi?id=154779
afaik the kernel only sends signals to threads that don't have them blocked. If
python doesn't want anyone but the main thread to get signals, it should just
block signals on all but the main thread and then by nature, all signals will go
to the main thread....
Well, I guess we have to tell that to the Python developers, then... :|
pygobject 2.12.2 raises the timeout to 1000msec (1s):
which is lower frequency than many other system services (e.g. avahi-daemon) and
would probably make yum-updatesd insignificant in terms of battery/CPU use.
Seems like a good candidate for a quick post FC6 update.
Packaged up gobject-2.12.2-1.fc6.
I'll close this bug once it's available in Fedora Updates.
Package pushed to Fedora Updates. Closing this bug.