Re: Regarding performance issues with the Emacs 25.1 Windows-build

[Fabrice Popineau <fabrice.popineau@centralesupelec.fr>]

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Probably not very important, but since I had a look at it, I post it.

The original poster recipe was about running Emacs with helm and its
default configuration, nothing else.
Here are some figures using emacs 25.1 :

emacs/w64, Windows 10, running from msys2 bash:
$ time emacs -Q -l /tmp/helm-cfg.el -f kill-emacs

real    0m1.258s
user    0m0.000s
sys     0m0.000s

emacs/ubuntu, running from WSL:

$time ../../build-emacs-ubuntu/src/emacs -display :0 -Q -l
/mnt/c/MSys64/tmp/helm-cfg.el -f kill-emacs

real    0m1.441s
user    0m0.625s
sys     0m0.734s

One can object that the Ubuntu provided by WSL is not the Real Thing (TM),
but that should be close enough.
So I don't see a real difference here.

Regards,

Fabrice


2016-11-30 15:48 GMT+01:00 Eli Zaretskii <eliz@gnu.org>:

> > From: Fabrice Popineau <fabrice.popineau@centralesupelec.fr>
> > Date: Wed, 30 Nov 2016 08:56:09 +0100
> > Cc: jostein@kjonigsen.net, Eli Zaretskii <eliz@gnu.org>,
> >       Noam Postavsky <npostavs@users.sourceforge.net>,
> >       Jostein Kjønigsen <jostein@secure.kjonigsen.net>,
> >       Emacs developers <emacs-devel@gnu.org>
> >
> > There is a user on Reddit who pretends that theses latest binaries of
> Emacs run slower on Windows than on
> > Linux.
> > I didn't get a chance yet to give it a try.
> > The test is as follows :
> >
> > - Install Helm from MELPA.
> > - Add this config to the init file, as suggested by Helm page
> >
> > https://www.reddit.com/r/emacs/comments/5e3xpu/emojis_
> in_emacs_intentionally_disabled_for_osx/dabya5i/
> >
> >
> > If anybody has a chance to do the testing. I'm not sure about what helm
> config he is
> > talking about (the full one or the default one).
>
> Helm fires up a lot of subprocesses, and subprocess handling in Emacs
> on MS-Windows is complicated and involves synchronization between
> threads.  Maybe that is at least one reason for slower startup.
>
> Another reason could be intensive file I/O, which is more efficient on
> GNU/Linux (not related to Emacs).
>
> > My guess is that something else than emacs is disturbing his load time
> (antivirus ?).
>
> Yes, antivirus could be yet another reason.
>
> But I agree that without a reproducible recipe, this discussion is a
> bit academic.
>
>

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