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Re: The Emacs master is much slower than the emacs-27 branch.
From: |
Alan Mackenzie |
Subject: |
Re: The Emacs master is much slower than the emacs-27 branch. |
Date: |
Fri, 4 Dec 2020 09:19:40 +0000 |
Hello, Ergus.
On Thu, Dec 03, 2020 at 22:09:19 +0100, Ergus wrote:
> On Thu, Dec 03, 2020 at 06:15:30PM +0000, Alan Mackenzie wrote:
> >Hello, Emacs.
> >I've got pretty much up to date copies of both the master and the
> >emacs-27 branches.
> >When I run my customary benchmark (see below) on master's src/xdisp.c in
> >master, it's taking around 34s. On emacs-27, it's taking 22s.
> >That's a massive slowdown. Does anybody know why this is happening?
> >Should I raise a bug report?
> >The benchmark I run is this:
> >(defmacro time-it (&rest forms)
> > "Time the running of a sequence of forms using `float-time'.
> >Call like this: \"M-: (time-it (foo ...) (bar ...) ...)\"."
> > `(let ((start (float-time)))
> > ,@forms
> > (- (float-time) start)))
> >(defun time-scroll (&optional arg)
> > (interactive "P")
> > (message "%s"
> > (time-it
> > (condition-case nil
> > (while t
> > (if arg (scroll-down) (scroll-up))
> > (sit-for 0))
> > (error nil)))))
> >On a freshly loaded buffer, do M-: (time-scroll).
> >--
> >Alan Mackenzie (Nuremberg, Germany).
> Hi Alan:
> I have observed the slowdown, but haven't have time to profile it
> properly. Maybe adding to your time-scroll function (profile-start 'cpu)
> just before and (profiler-stop) at the end to see the profile-report
> could provide useful information.
Now that I've reported the problem, I don't see it any more. I just see
the 22s timing all the time. Otherwise I would raise the bug report.
> The other thing I would check may be to compare the values of gcs-done
> in both cases.
Thanks! I didn't know about that variable.
> Best,
> Ergus
--
Alan Mackenzie (Nuremberg, Germany).
- The Emacs master is much slower than the emacs-27 branch., Alan Mackenzie, 2020/12/03
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/03
- Re: The Emacs master is much slower than the emacs-27 branch., Mattias EngdegÄrd, 2020/12/03
- Re: The Emacs master is much slower than the emacs-27 branch., Ergus, 2020/12/03
- Re: The Emacs master is much slower than the emacs-27 branch.,
Alan Mackenzie <=
- Re: The Emacs master is much slower than the emacs-27 branch., Stephen Berman, 2020/12/03
- Re: The Emacs master is much slower than the emacs-27 branch., Alan Mackenzie, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Stephen Berman, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Alan Mackenzie, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Stephen Berman, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Stephen Berman, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Eli Zaretskii, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Stephen Berman, 2020/12/04
- Re: The Emacs master is much slower than the emacs-27 branch., Stephen Berman, 2020/12/04