Re: Native compilation on Windows, was Re: Bootstrap Compilation Speed

[H. Dieter Wilhelm]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: "H. Dieter Wilhelm" <dieter@duenenhof-wilhelm.de>
>> Cc: emacs-devel@gnu.org
>> Date: Tue, 25 Jan 2022 14:46:57 +0100
>> 
>> In the thread's context I meant the time it takes with an empty
>> eln-cache to compile all .eln files after loading the init file.
>
> I'm not aware of any facilities, except noting the time when the
> compilation started (i.e. when you start Emacs), and then looking at
> the time stamps of the produced *.eln files.

Thanks a lot for the hint!

  $ rm -r eln-cache/
  $ date && emacs
  $ date -r latest/eln-cache/file

That worked for me doing a quick check:

I'm curious about the hyperthreading potential on my 4 core Intel laptop
for doing compilations. And checked Emacs-28.0.91 from Corwin with (setq
native-comp-async-jobs-number 8) vs 4 jobs.  My init.el forces Emacs to
compile over 200 .eln files and it took about 5'40" with 8 logical
processors and 7'7" with 4 logical processors.

--
        Dieter