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From: zimoun <zimon.toutoune@gmail.com>
Subject: =?UTF-8?Q?Re=3A_Speeding_up_=E2=80=9Cguix_pull=E2=80=9D=3A_splitting_modules?=
Date: Mon, 20 Jan 2020 18:44:54 +0100
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To: =?UTF-8?Q?Ludovic_Court=C3=A8s?= <ludo@gnu.org>
Cc: Guix Devel <guix-devel@gnu.org>

Hi Ludo,

On Sun, 12 Jan 2020 at 00:29, Ludovic Court=C3=A8s <ludo@gnu.org> wrote:

> zimoun <zimon.toutoune@gmail.com> skribis:
>
> > So knowing where the cycles are could help to transform the DaG (not
> > fully acyclic yet) to a DAG. :-)
>
> Unfortunately, the module graph necessarily contains cycles.  The only
> way to avoid them would be to have exactly one module per package, given
> that the package graph is acyclic.

My mind is not clear and I miss a point.

I understand that module graph contains cycles. I am not convinced it
is *necessary* and I am not convinced neither that the only solution
is "one module per package".

Today, the structure of modules is per language and/or topic.
The union of all the package graphs which is big DAG can be
arbitrarily splited into sub-DAGs and these sub-DAGs becomes modules.
And I am not convinced that the size of these sub-DAG is only one
package.


Well, that's another story. :-)
And it will not help for speeding up.

However, working on the graph could help to identify the "hot"
packages and/or modules, IMHO.


Cheers,
simon