GNU logs - #78194, boring messages

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Subject: bug#78194: `guix pull --list-generations' is extremely slow
Resent-From: Ian Eure <ian@HIDDEN>
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I=E2=80=99ve been frustrated by this before, but decided to measure=20
things:

`guix home list-generations' takes 3.535s to list 28 items.
`guix system list-generations' takes 1.406s to list 35 items.
`guix pull --list-generations' takes 232.599s to list 41 items.

Why is `guix pull --list-generations' >100x slower than `guix=20
system list-generations'?

Thanks,

  -- Ian

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To: Ian Eure <ian@HIDDEN>
Subject: bug#78194: Acknowledgement (`guix pull --list-generations' is
 extremely slow)
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Subject: bug#78194: `guix pull --list-generations' is extremely slow
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Date: Wed, 14 May 2025 18:33:35 +0200
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Hi,

Ian Eure <ian@HIDDEN> writes:

> I=E2=80=99ve been frustrated by this before, but decided to measure thing=
s:
>
> `guix home list-generations' takes 3.535s to list 28 items.
> `guix system list-generations' takes 1.406s to list 35 items.
> `guix pull --list-generations' takes 232.599s to list 41 items.
>
> Why is `guix pull --list-generations' >100x slower than `guix system
> list-generations'?

Because for each pair of generations, it shows the corresponding news
entries (as per =E2=80=98guix pull --news=E2=80=99), and that part is quite=
 expensive
because it involves a Git log traversal.

I think we should (1) optimize the news code (that=E2=80=99s
=E2=80=98channel-news-for-commit=E2=80=99), and (2) if that=E2=80=99s not e=
nough consider
keeping it off by default in =E2=80=98guix pull --list-generations=E2=80=99.

Thoughts?

Ludo=E2=80=99.

Message sent to bug-guix@HIDDEN:

Subject: bug#78194: `guix pull --list-generations' is extremely slow
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
In-Reply-To: <87h61nywww.fsf@HIDDEN> ("Ludovic =?UTF-8?Q?Court=C3=A8s?="'s message of "Wed, 14 May 2025 18:33:35 +0200")
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Date: Wed, 14 May 2025 22:28:37 +0200
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> Because for each pair of generations, it shows the corresponding news
> entries (as per =E2=80=98guix pull --news=E2=80=99), and that part is qui=
te expensive
> because it involves a Git log traversal.
>
> I think we should (1) optimize the news code (that=E2=80=99s
> =E2=80=98channel-news-for-commit=E2=80=99), and (2) if that=E2=80=99s not=
 enough consider
> keeping it off by default in =E2=80=98guix pull --list-generations=E2=80=
=99.

That turned out to be easier than I thought, see
<https://issues.guix.gnu.org/78432>, which makes it 10=E2=80=9320x faster.

Ludo=E2=80=99.

Last modified: Wed, 14 May 2025 22:00:04 UTC

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