From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Faster!
Date: Thu, 31 Jan 2013 23:22:52 +0100
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In-Reply-To: <87ehh2ffo1.fsf@gnu.org> ("Ludovic
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To: Andreas Enge <andreas@enge.fr>
Cc: bug-guix@gnu.org

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

> No, but it=E2=80=99s true that it=E2=80=99s surprisingly slow to start:
>
> $ time ./pre-inst-env guix-package
>
> real    0m1.084s
> user    0m0.904s
> sys     0m0.058s

This is actually the time it takes to connect to the daemon, and to
compute the derivation of Guile (which is then used to build the
profile, if a profile gets built.)

Queries (-I and -A) don=E2=80=99t need this, so I just rearranged the code
accordingly.  Both now take less than .2s on my laptop.

In the roll-back case, neither is necessary, except when rolling back to
generation 0 for the first time.  All other actions need it.  So I just
kept it for all the actions, including roll-back.

Thanks,
Ludo=E2=80=99.