Re: [RFC] Moving to Guile 2.2 and away from GUB

[Jean Abou Samra]

Le 25/11/2021 à 20:06, Jonas Hahnfeld a écrit :
> Am Donnerstag, dem 25.11.2021 um 19:51 +0100 schrieb Jean Abou Samra:
> > Le 24/11/2021 à 22:41, Jonas Hahnfeld via Discussions on LilyPond
> > development a écrit :
> > > This improves with compiled bytecode, as Jean replied, but this won't
> > > be included initially (I
> > > forgot to mention this). We should definitely have it for the next
> > > stable release, but I'm optimistic that this is possible.
> >
> > In my opinion, while not a requirement for switching
> > to Guile 2, it would be really nicer (and wise to implement
> > before removing Guile 1 support entirely)
> That's exactly the thing that is *not* going to happen in that order,
> at least not by me: Making the files byte-compilable will require many
> changes (making all files modules on their own, as you write, plus
> making sure that the different modules correctly depend on each other,
> plus moving all calls to functions defined in C out of the parts that
> are interpreted by the compiler, because they're not there unless we
> run the full environment)


Could you explain the last part? I don't
understand what you mean.


> which I think will require constructs that
> are simply not available in Guile 1.8.


Not sure. Only actually trying will tell though.


> [...] On top of all that, I'm not actually
> sure it's a good idea to byte-compile during development because it's
> really, really slow - I currently estimate that compiling all *.scm
> files can easily take as long as compiling all C++ files.



Well, for me, it's proving quite fast:

$ rm -rf out/share/lilypond/current/guile/ccache/
$ time out/bin/lilypond
[Zillions of warnings...]
real    0m58,060s
user    0m57,757s
sys    0m0,125s

(Compiling all C++ files without parallelism
takes about 6 minutes.)

I also have good hope with optimization levels
(only available with guild).

$ time guild-2.2 compile scm/define-grobs.scm
wrote 
`/home/jean/.cache/guile/ccache/2.2-LE-8-3.A/home/jean/repos/lilypond/scm/define-grobs.scm.go' 


real    0m3,167s
user    0m3,617s
sys    0m0,040s

$ time guild-2.2 compile -O0 scm/define-grobs.scm
wrote 
`/home/jean/.cache/guile/ccache/2.2-LE-8-3.A/home/jean/repos/lilypond/scm/define-grobs.scm.go' 


real    0m1,392s
user    0m1,678s
sys    0m0,025s


Best,
Jean