Performance problems with emacs-X11 in current cygwin

[Ken Brown]

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.

Ken


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