Re: Bootstrap Compilation Speed

[phillip . lord]

On 2022-01-14 13:21, Eli Zaretskii wrote:
> > Date: Fri, 14 Jan 2022 11:36:26 +0000
> > From: phillip.lord@russet.org.uk
> >
> > Has anyone else seen a regression in bootstrap compilation speed?
> >
> > I am currently building Emacs-28 trunk. I am still on the
> > bootstrap-emacs phase after half an hour or so and am getting no more
> > than 2 or 3 ELC+ELN steps complete per minute, with a parallel build.
>
> How many parallel jobs did you allow Make to have?  And on what OS is
> this?
>
> Also, do you see this slow compilation only for the first few files,
> before comp.el is natively-compiled, or even after that?


Ubuntu 20.04. I tried both single threaded (so I could see how long 
individual files take) and my normal build (-j 20). Again, based on my 
ad hoc experience rather than any careful measurement, it was for all 
the elc+eln using bootstrap-emacs. Once emacs proper was generated, 
things went rather more quickly and upto my expectations.

It's probably something local to me. I thought to mention it here 
because I think we still do not have good metrics set up for bootstrap 
build speed performance.

Phil