From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#37822: guile-fibers build failure
Date: Tue, 22 Oct 2019 14:39:44 +0200
Message-ID: <87v9sh2bu7.fsf@gnu.org>
References: <87o8ydqfte.fsf@cbaines.net> <87k18zr37i.fsf@cbaines.net>
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In-Reply-To: <87k18zr37i.fsf@cbaines.net> (Christopher Baines's message of
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Hi Chris,

Christopher Baines <mail@cbaines.net> skribis:

> I've now tried running the tests using Guix immediately prior to the
> recent core-updates merge (d57660c54907cc6fba8b0adf6295fd2311ada6cf),
> and immediately after the merge
> (cf3d1763ede1a329c2bc932c84591ab594bb6c96) and the tests passed before,
> and failed afterwards.
>
> I've also tried running the tests manually, I did see a couple of times
> a failure that mentioned about "Too many open files" [1].
>
> I then attempted to raise the limit for open files, I think using
> prlimit like `prlimit --nofile=3D8096:8096 --pid GUIX_DAEMON_PID` did the
> trick, and that meant that I built the package sucessfully.
>
> I'm thinking now that there's a relationship between the number of cores
> the tests are run with, and the required file descriptors. Also, I'm
> pretty sure this behaviour changed when core-updates was merged.

Indeed, Fibers uses =E2=80=98epoll=E2=80=99 and for that it consumes file d=
escriptors
proportionally to the number of threads, IIRC.  You=E2=80=99d still have to=
 have
a large number of threads to hit the default rlimit, but that=E2=80=99s not
impossible.

> I'll close this bug for now, as I've found a way to build the package.

To avoid =E2=80=9Crandom=E2=80=9D build failures, perhaps we should include=
 a hack in
the =E2=80=98check=E2=80=99 phase, like calling =E2=80=98setrlimit=E2=80=99=
 right from there, WDYT?

Thanks,
Ludo=E2=80=99.