From: "Gábor Boskovits" <gboskovits@gmail.com>
To: Maxime Devos <maximedevos@telenet.be>
Cc: "Ludovic Courtès" <ludo@gnu.org>,
"Ricardo Wurmus" <rekado@elephly.net>,
"Guix Devel" <guix-devel@gnu.org>
Subject: Re: Faster "guix pull" by incremental compilation and non-circular modules?
Date: Tue, 31 May 2022 06:54:05 +0200 [thread overview]
Message-ID: <CAAqdTgNdvjhT-G0TATOikFS66kqRXT9Ge-7kiG9PeBC9g6f8Wg@mail.gmail.com> (raw)
In-Reply-To: <752f9901f6c3c813b5553534aefc2e4e8f5aad63.camel@telenet.be>
[-- Attachment #1: Type: text/plain, Size: 3405 bytes --]
Hello Maxime,
Maxime Devos <maximedevos@telenet.be> ezt írta (időpont: 2022. febr. 28.,
H, 19:51):
> Ludovic Courtès schreef op ma 28-02-2022 om 14:17 [+0100]:
> > Hi,
> >
> > Maxime Devos <maximedevos@telenet.be> skribis:
> >
> > > 2. Instead of building all of Guix as a single derivation,
> > > create a DAG of derivations. More concretely:
> > >
> > > First read the *.scm files to determine which module imports
> > > which modules. Then to compile, say, (gnu packages acl),
> > > a derivation taking gnu/packages/acl.scm and its dependencies
> > > gnu/packages/attr.go, gnu/packages/base.go, ... is made
> > > compiling gnu/packages/acl.scm to a gnu/packages/acl.go.
> > >
> > > Then to build all of Guix, 'union-build' or 'file-union' is used.
> >
> > This is what (guix self), used by ‘guix pull’, is already doing.
> >
> > However, currently, package modules are split in just two groups: the
> > “base” group is the closure of (guix packages base), and the second
> > group has all the rest:
> >
> > [...]
>
> Looking at (guix self), it also has a few groups for non-package
> modules (system tests, scripts, ...).
>
> > At its core though, the situation pretty much reflects the free software
> > situation: there are low-level packages (glibc, GCC, GTK, etc.) that
> > might depend on high-level packages (Python, Pandoc, Rust, etc.).
> >
> > It’s not easy to split this spaghetti ball in smaller groups.
>
> It's not easy to manually split the spaghetti, but we don't have
> to, we could let the computer split the spaghetti for us (at least
> partially, because of the circular imports), by computing the graph of
> strongly-connected components and considering each SCC to be a ‘group’,
> some of which depend on other groups, forming a DAG.
>
I was thinking about a bit of a different structure that can also be
automated. My original idea was to use the already existing tree structure
of the derivations, and split it based on depth. I think that gives a bit
more structure, but might require splitting things that now are together
(for example iirc sometimes we are defining bootstrap packages inheriting
from the fully fledged ones, which introduces a syntactic dependency on
something that is higher up the tree). Wdyt?
Regards,
g_bor
> I believe Ricardo Wurmus has some script for computing the SCC?
>
> Splitting large SCC in smaller parts can be left as an exercise
> for later, it's a somewhat orthogonal concern.
>
> > Thoughts?
>
> I think it would be nice to let (guix self) automatically determine the
> DAG of groups. It would reduce the ad-hocness of the *...-modules*
> variables (some care required for patches, guix/man-db.scm, .js ...).
>
> It would also make the node tree wide, which could reduce memory usage
> (which might help with the ‘guix pull segfaults on i686-linux’
> reports). In case of a crash (*), "guix pull" does not have to start
> over from scratch, which would also help with those reports.
>
> (*) This does not help with "failed to compute the derivation of Guix".
>
> Some work would be required, but I think it will be worth it, and it
> only has to be done once.
>
> TBC, this was just an idea I wanted to share, I won't be working on it
> in the forseeable future.
>
> Greetings,
> Maxime.
>
[-- Attachment #2: Type: text/html, Size: 4320 bytes --]
next prev parent reply other threads:[~2022-05-31 4:54 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-20 10:05 Excessively energy-consuming software considered malware? Maxime Devos
2022-02-20 10:48 ` Tobias Platen
2022-02-20 11:13 ` Martin Becze
2022-02-20 16:52 ` Maxime Devos
2022-02-20 20:39 ` Martin Becze
2022-02-24 9:23 ` Hartmut Goebel
2022-02-24 11:18 ` Martin Becze
2022-02-25 0:27 ` Christine Lemmer-Webber
2022-02-25 12:41 ` Bengt Richter
2022-02-25 13:04 ` Tobias Geerinckx-Rice
2022-02-25 16:14 ` Bengt Richter
2022-02-25 16:32 ` Ricardo Wurmus
2022-02-25 16:49 ` Paul Jewell
2022-02-25 17:05 ` Maxime Devos
2022-02-25 17:35 ` Taylan Kammer
2022-02-25 19:00 ` Leo Famulari
2022-04-04 8:00 ` Attila Lendvai
2022-04-04 9:43 ` Maxime Devos
2022-04-04 10:15 ` Maxime Devos
2022-04-04 12:49 ` Attila Lendvai
2022-04-04 10:16 ` Maxime Devos
2022-04-04 10:37 ` Maxime Devos
2022-04-04 11:22 ` indieterminacy
2022-04-04 18:39 ` Liliana Marie Prikler
2022-02-24 9:13 ` Hartmut Goebel
2022-02-24 9:36 ` Attila Lendvai
2022-02-20 11:08 ` Ekaitz Zarraga
2022-02-20 11:27 ` Compiling blender Ricardo Wurmus
2022-02-20 11:34 ` Ekaitz Zarraga
2022-02-20 12:19 ` Faster "guix pull" by incremental compilation and non-circular modules? Maxime Devos
2022-02-20 16:47 ` Philip McGrath
2022-02-20 17:47 ` Semantics of circular imports Maxime Devos
2022-03-27 14:12 ` Philip McGrath
2022-03-27 14:19 ` Maxime Devos
2022-03-27 14:24 ` Maxime Devos
2022-03-27 14:33 ` Maxime Devos
2022-03-27 14:55 ` Maxime Devos
2022-03-28 4:24 ` Zhu Zihao
2022-03-30 4:50 ` Maxim Cournoyer
2022-02-28 13:17 ` Faster "guix pull" by incremental compilation and non-circular modules? Ludovic Courtès
2022-02-28 18:50 ` Maxime Devos
2022-05-31 4:54 ` Gábor Boskovits [this message]
2022-05-31 8:49 ` Maxime Devos
2022-05-31 10:23 ` Ricardo Wurmus
2022-02-20 15:54 ` Compiling blender Ricardo Wurmus
2022-02-20 16:14 ` Ekaitz Zarraga
2022-02-20 12:20 ` Excessively energy-consuming software considered malware? Taylan Kammer
2022-02-20 12:37 ` Maxime Devos
2022-02-20 12:44 ` Taylan Kammer
2022-02-20 14:59 ` Philip McGrath
2022-02-20 18:53 ` Christine Lemmer-Webber
2022-02-20 20:34 ` Jonathan McHugh
2022-02-20 12:32 ` Paul Jewell
2022-02-20 18:26 ` Liliana Marie Prikler
2022-02-20 19:36 ` Ryan Sundberg
2022-02-21 9:29 ` Attila Lendvai
2022-02-21 13:06 ` Maxime Devos
2022-02-21 18:56 ` raingloom
2022-02-21 23:02 ` Attila Lendvai
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://guix.gnu.org/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAAqdTgNdvjhT-G0TATOikFS66kqRXT9Ge-7kiG9PeBC9g6f8Wg@mail.gmail.com \
--to=gboskovits@gmail.com \
--cc=guix-devel@gnu.org \
--cc=ludo@gnu.org \
--cc=maximedevos@telenet.be \
--cc=rekado@elephly.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/guix.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).