On 6/10/2012 8:45 PM, Ken Brown wrote: > The bisection shows that the first problematic commit is this one: >> http://git.gnome.org/browse/glib/commit/?h=glib-2-32&id=7eae486179e2799c369ed9ffcea663bf9161ce79 >>> Author: Ryan Lortie <desrt@desrt.ca> > Date: Wed Aug 31 22:07:02 2011 -0400 >> GMain: simplify logic for g_wakeup_acknowledge() >> Instead of messing around with context->poll_waiting, just look at the > GPollFD to see if the GWakeup needs to be acknowledged. I think this commit contains a typo: "events" should be "revents". (context->wake_up_rec.events is always nonzero at this point in the code, so it makes no sense to test that.) As a result, g_wakeup_acknowledge() is being called much more often than necessary. I think this could easily explain the performance problems that have been reported, but I won't have a chance to test this on my (slow) XP system for a while, and possibly not until tomorrow. Ken -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple