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Date: Tue, 12 Jun 2012 09:02:31 -0400
From: Ken Brown <kbrown AT cornell DOT edu>
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Subject: Re: Performance problems with emacs-X11 in current cygwin
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On 6/11/2012 11:10 AM, Ken Brown wrote:
> On 6/11/2012 7:39 AM, Ken Brown wrote:
>> On 6/10/2012 10:54 PM, Yaakov (Cygwin/X) wrote:
>>> On 2012-06-10 19:45, 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 AT desrt DOT 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.
>>>>
>>>> In case anyone else wants to confirm this, you can get my glib
>>>> builds by
>>>> running
>>>>
>>>> setup.exe -K http://sanibeltranquility.com/cygwin/kbrown.gpg
>>>>
>>>> and adding http://sanibeltranquility.com/cygwin to the list of mirrors.
>>>> The problematic version is
>>>>
>>>> libglib2.0_0-2.30.90_7eae4861-1
>>>>
>>>> and the preceding version (without the problem) is
>>>>
>>>> libglib2.0_0-2.30.90_87880df-1
>>>>
>>>> I've tested the latter with emacs-23, emacs-24, and gvim.
>>>
>>> Thanks for doing this. Is this still only a problem with XP? If so, it
>>> is most likely a bug in Cygwin itself.
>>
>> It's a problem with XP but not with Windows 7. No one has reported
>> testing other systems.
>>
>> Do you understand the code well enough to make a test case to help cgf
>> and Corinna debug it, assuming it's a Cygwin bug?
>
> BTW, there's no easy way to revert the problematic commit, in view of
> this commit, which came on the next day:
>
> http://git.gnome.org/browse/glib/commit/?h=glib-2-32&id=1c8c408c51c85230356cc95c06f2e1bd3f376624
>
>
> The commentary that goes with that commit gives some explanations of
> what's supposed to happen. It doesn't mean much to me, because of my
> ignorance of how glib works. But maybe it will give you an idea where to
> look.

One further data point: I tried the 2012-01-11 cygwin snapshot, and the 
problem is still there.  So if it's a Cygwin bug, it isn't one that was 
introduced in the last 5 months.

Ken


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