The suggested configuration to speed up Emacs with libjansson and native elisp compilation enabled.

The suggested configuration to speed up Emacs with libjansson and native elisp compilation enabled.

[Hongyi Zhao]

I noticed the features and techniques to speed up Emacs with
libjansson and native elisp compilation, describe here [1-3]. I'm on
Ubuntu 20.04.2 LTS and compiled the latest git master Emacs with the
following steps:

$ sudo apt install libgccjit0 libgccjit-9-dev libjansson4 libjansson-dev
$ ./configure CFLAGS="-g3 -O2" --without-m17n-flt --with-native-compilation
$ make -j 44 bootstrap
$ make -j44 NATIVE_FULL_AOT=1
$ make tags
$ sudo make install

After I start Emacs with `emacs -Q', I confirmed the above features by
`C-j' the following code snippets in the scratch buffer:

(if (and (fboundp 'native-comp-available-p)
       (native-comp-available-p))
  (message "Native compilation is available")
(message "Native complation is *not* available"))
"Native compilation is available"

(if (functionp 'json-serialize)
  (message "Native JSON is available")
(message "Native JSON is *not* available"))
"Native JSON is available"

But I'm not familiar with these features till now, so I want to know
the suggested configuration for them used in initialization file. Any
hints will be greatly appreciated.

[1] https://akrl.sdf.org/gccemacs.html#orgf5ebdd1
[2] https://ddavis.io/posts/emacs-native-centos7/
[3] https://www.masteringemacs.org/article/speed-up-emacs-libjansson-native-elisp-compilation

Regards
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province

Re: The suggested configuration to speed up Emacs with libjansson and native elisp compilation enabled.

[Thibaut Verron]

On Sat, 25 Sep 2021, 06:47 Hongyi Zhao, <hongyi.zhao@gmail.com> wrote:

> But I'm not familiar with these features till now, so I want to know
> the suggested configuration for them used in initialization file. Any
> hints will be greatly appreciated.
>

They should be plug and play. When loading packages you will get a few
freezes while emacs native compiles them the first time.

The fast json parser will mostly bring improvements to lsp-powered modes,
and again in that case it should be plug and play.

Re: The suggested configuration to speed up Emacs with libjansson and native elisp compilation enabled.

[Hongyi Zhao]

Awesome, thanks!

On Sat, Sep 25, 2021 at 3:59 PM Thibaut Verron <thibaut.verron@gmail.com> wrote:
>
> On Sat, 25 Sep 2021, 06:47 Hongyi Zhao, <hongyi.zhao@gmail.com> wrote:
>>
>> But I'm not familiar with these features till now, so I want to know
>> the suggested configuration for them used in initialization file. Any
>> hints will be greatly appreciated.
>
>
> They should be plug and play. When loading packages you will get a few freezes while emacs native compiles them the first time.
>
> The fast json parser will mostly bring improvements to lsp-powered modes, and again in that case it should be plug and play.



-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province