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Date: Mon, 11 Jun 2012 09:55:54 -0400
Message-ID: <CAMK_jUUEdws1YMomkjQ8bHcrm7xYwC_qBB3KAH29DNO-mk+EiA@mail.gmail.com>
Subject: Re: Performance problems with emacs-X11 in current cygwin
From: K Stahl <kdstahl AT gmail DOT com>
To: cygwin AT cygwin DOT com
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I've tried to revert the version of GLib 2.0 using the instructions
provided, but when I attempt to start GVim nothing happens.  The
process appears to fail without an explanation.  System WinXP and all
Cygwin libs updated to the latest.

On Sun, Jun 10, 2012 at 8:45 PM, Ken Brown <kbrown AT cornell DOT edu> wrote:
> On 6/8/2012 12:45 PM, Ken Brown wrote:
>>
>> On 6/8/2012 11:33 AM, Achim Gratz wrote:
>>>
>>> Ken Brown writes:
>>>>
>>>> As I said earlier, I don't understand very well how git branches work,
>>>> but I *think* this means we have to look in the 2-32 branch, prior to
>>>> the 2.31.0 tag, to find the problematic commit. I've checked out the
>>>> 2-32 branch, and I guess the next step is to find a problem-free
>>>> revision of that branch, and then bisect between it and the 2.31.0
>>>> tag. I'm in the process of reading the git documentation to figure out
>>>> how to do that, but I wouldn't object if someone would save me some
>>>> time by giving me the appropriate git commands.
>>>
>>>
>>> I've had a quick look at how the GNOME folks use their release branches:
>>> they are tagged in master and then only some version bumping and a few
>>> quickfixes. There are no odd numbered releases, so I assume they start
>>> the disruptive changes right after a release, tag the unstable version
>>> in master with an odd number and then work out the kinks until the new
>>> release is done.
>>>
>>> So, you can indeed start on the 2.32 branch and then bisect down to the
>>> 2.30 tag. Don't bother with the run-up between 2.31 and 2.32, just
>>> bisect it whole, the bisect sequence will be just one build longer if at
>>> all.
>>>
>>> git checkout glib-2-32
>>> git bisect start bad
>>> git bisect good 2.30.3
>>>
>>> If any of the intermediate versions doesn't build, say
>>>
>>> git bisect skip
>>>
>>> with the offending commit still checked out.
>>
>>
>> Thanks, Achim. That helps a lot. The only thing I might have to change
>> is the starting point for the bisection, since the tag 2.30.3 represents
>> a fairly recent commit. But I think starting with 2.30.1 should work.
>> I'll give it a try.
>
>
> 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.
>
>
> Ken
>
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