bug#51734: 29.0.50; got slow

[Ken Brown]

On 11/11/2021 1:11 PM, Ken Brown wrote:
> On 11/11/2021 9:15 AM, Eli Zaretskii wrote:
> > > From: Katsumi Yamaoka <yamaoka@jpl.org>
> > > On Thu, 11 Nov 2021 10:09:30 +0200, Eli Zaretskii wrote:
> > > > > Probably what I should do could be bisecting the recent commits.
> > > > That'd be best, if you can.  Thanks.
> > >
> > > I did it and found the revision that causes this problem on at
> > > least Cygwin-64.  That is d5bb053.
> >
> > That's strange: that changeset changed just the docs, and the only
> > changes in code are in xwidget.c (which your build shouldn't compile)
> > and in keyboard.c, where the changes just remove redundant braces, and
> > again mostly in places that are built only when xwidgets are
> > supported.
>
> I can confirm the extreme slowness on my 64-bit Cygwin system, but I don't agree 
> with the bisection.  I still see the slowness in d5bb053^.

I just did my own bisection and found the following as the first bad commit:

commit 858868e36dbb8fe30fb5ae6a59ebb2fd123e307d
Author: Lars Ingebrigtsen <larsi@gnus.org>
Date:   Sun Nov 7 04:55:02 2021 +0100

    Actually start the alarms in atimer

    * src/atimer.c (set_alarm): Actually start both timerfd and
    alarms (attempted in 4107549a).

I haven't yet tried to figure out why.

Ken