Re: The Emacs master is much slower than the emacs-27 branch.

[Arthur Miller]

Arthur Miller <arthur.miller@live.com> writes:

> Alan Mackenzie <acm@muc.de> writes:
>
>> Hello, Steve.
>>
>> On Thu, Dec 03, 2020 at 23:17:18 +0100, Stephen Berman wrote:
>>> On Thu, 3 Dec 2020 18:15:30 +0000 Alan Mackenzie <acm@muc.de> 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.
>>
>>> Hm, this is odd: I just ran your benchmark on src/xdisp.c (starting
>>> Emacs with -Q, both configured with CFLAGS='-Og -g3') and got vastly
>>> different timings than you did:
>>
>>> master:   21.785817861557007
>>> emacs-27: 61.3885281085968
>>
>> Maybe the emacs-27 is built without optimisation for debugging.
>>
>>> This is with:
>>
>>> GNU Emacs 28.0.50 (build 42, x86_64-pc-linux-gnu, GTK+ Version 3.24.17,
>>> cairo version 1.17.3) of 2020-11-21
>>> emacs-repository-version: "0a8cd0116204354e95fbb4ebde64c58123502aa2"
>>
>>> and
>>
>>> GNU Emacs 27.1.50 (build 18, x86_64-pc-linux-gnu, GTK+ Version 3.24.17)
>>> of 2020-11-21
>>> emacs-repository-version: "3ceee398192e312faa3ea073365c49bcce9ef61b"
>>
>>> Steve Berman
> On my computer "stock" build from master (28) and 27.1 from Arch repo are at 
> about
> same speed. I even posted on Reddit like two days ago.
>
> You can see in screenshots, image 1 and 3 are "stock" versions, 27.1 and
> 28. Image 2 is my own configured build (no gtk and some other stuff).
Sorry, I saw later mails and realized you were talking about benchmark;
thought you were talking about the startup :-).