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From: zimoun <zimon.toutoune@gmail.com>
Subject: Re: Inverted index to accelerate guix package search
Date: Thu, 16 Jan 2020 16:04:53 +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 Thu, 16 Jan 2020 at 15:46, Ludovic Court=C3=A8s <ludo@gnu.org> wrote:

> > We could build and install the index when Guix is built and installed
> > and then use it for the search.  I can=E2=80=99t think of a downside to=
 adopting
> > an index compared to what we have now.
>
> The possible downsides are (1) =E2=80=98guix pull=E2=80=99 will take an a=
dditional 8
> seconds, (2) there=E2=80=99ll be some extra complexity because the curren=
t
> implementation needs to be kept anyway for when the pre-built index is
> not authoritative=E2=80=94i.e., when =E2=80=98GUIX_PACKAGE_PATH=E2=80=99 =
is set or when =E2=80=98-L=E2=80=99 is
> used; see =E2=80=98cache-is-authoritative?=E2=80=99 in (gnu packages).

About (1), let implement something experimental and time it to compare
apples with apples. :-)
I mean I am working on it. As said elsewhere, "guix search" could be
improved in different area and the inverted index is an easy first
step, IMHO.

About (2), I have not figured out yet how "guix pull" works and all
the relative folders in ~/.cache/guix.
I will report my issues later. :-)


> I don=E2=80=99t find =E2=80=98guix search=E2=80=99 to be excessively slow=
 currently (on an SSD
> at least), but I agree that the speedup would be welcome!

One next step would to search in all the packages and/or services that
"guix time-machine" can manipulate.


Cheers,
simon