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From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Ready for Guile 2.2!
Date: Thu, 20 Apr 2017 14:35:42 +0200
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In-Reply-To: <87lgs65l3c.fsf@gnu.org> ("Ludovic
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	\=\?utf-8\?Q\?s\?\= message of "Wed, 15 Mar 2017 21:41:27 +0100")
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To: guix-devel <guix-devel@gnu.org>

Hello Guix!

ludo@gnu.org (Ludovic Court=C3=A8s) skribis:

> An unscientific illustration of this point:
>
> scheme@(guile-user)> ,use(guix scripts build)
> scheme@(guile-user)> ,time (guix-build "libreoffice" "certbot" "xmonad" "=
-n" "--no-substitutes" "--no-build-hook")
> The following derivations would be built:
>
> [...]
>
> ;; 2.724686s real time, 3.117062s run time.  0.880827s spent in GC.
> scheme@(guile-user)> (version)
> $1 =3D "2.0.13"
>
>
> Compared to:
>
> scheme@(guile-user)> ,time (guix-build "libreoffice" "certbot" "xmonad" "=
-n" "--no-substitutes" "--no-build-hook")
>
> [...]
>
> ;; 2.224821s real time, 2.347463s run time.  0.374545s spent in GC.
>
> Roughly an 18% speedup here.

In Guile 2.2.1 Andy fixed an optimization of =E2=80=98thunk?=E2=80=99, whic=
h is called a
lot when we load packages (via =E2=80=98make-promise=E2=80=99, for record f=
ields marked
as =E2=80=98delayed=E2=80=99).  Now we get=E2=80=A6 drum roll=E2=80=A6

--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> ,use(guix scripts build)
scheme@(guile-user)> ,time (guix-build "libreoffice" "certbot" "xmonad" "-n=
" "--no-substitutes" "--no-build-hook")

[...]

;; 1.826528s real time, 1.994426s run time.  0.382750s spent in GC.
scheme@(guile-user)> (version)
$1 =3D "2.2.1"
--8<---------------cut here---------------end--------------->8---

That=E2=80=99s a 33% speedup compared to 2.0.

Andy super-hero!

Ludo=E2=80=99.