From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#27780: guix environment to build guile from git required
	excessive CPU time
Date: Mon, 24 Jul 2017 11:02:13 +0200
Message-ID: <87pocqp5re.fsf@gnu.org>
References: <87pocucx0o.fsf@netris.org>
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In-Reply-To: <87pocucx0o.fsf@netris.org> (Mark H. Weaver's message of "Thu, 20
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To: Mark H Weaver <mhw@netris.org>
Cc: 27780@debbugs.gnu.org

Hi Mark,

Mark H Weaver <mhw@netris.org> skribis:

> I just ran the following command on my Thinkpad X200 running GuixSD:
>
>   ./pre-inst-env guix environment guile --ad-hoc autoconf automake libtoo=
l flex gettext
>
> Using the guix client from a git checkout at v0.13.0-1496-gcfd6a3b1e,
> and using guix-daemon from guix-0.13.0-3.b547349.
>
> This command took approximately 20 minutes of CPU time before
> downloading anything except possibly some NARINFOs.  During this initial
> 20 minutes of CPU-bound activity, the only output was 4 occurrences of
> the following message:
>
> substitute: updating list of substitutes from 'https://mirror.hydra.gnu.o=
rg'... 100.0%
>
> The CPU time was roughly evenly split between the following two
> processes:
>
> USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
> root      8456 57.0  0.1  37420  7788 ?        Rs   22:27  11:31  \_ /gnu=
/store/gkv8zl774h2qpa89mrf6d74fry3rsnpa-guix-0.13.0-3.b547349/bin/guix-daem=
on 8450                guixbuild --max-silent-time 0 --timeout 0 --substitu=
te-urls https://mirror.hydra.gnu.org --gc-keep-derivations=3Dyes --gc-keep-=
outputs=3Dyes
> root      8457 45.0  0.9 124040 38556 ?        Rl   22:27   9:03      \_ =
/gnu/store/z16li2znnk2pdgrg3ldm34k669pcrdcx-guile-2.2.2/bin/guile --no-auto=
-compile /gnu/store/gkv8zl774h2qpa89mrf6d74fry3rsnpa-guix-0.13.0-3.b547349/=
bin/.guix-real substitute --query

Is it reproducible?  If/when that happens again, could you =E2=80=98strace=
=E2=80=99 the
=E2=80=98guix substitute=E2=80=99 process?

Any idea whether hydra.gnu.org was loaded at the time and returning 504
(=E2=80=9CGateway Timeout=E2=80=9D)?

Thanks,
Ludo=E2=80=99.