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From: zimoun <zimon.toutoune@gmail.com>
To: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Cc: Mathieu Othacehe <othacehe@gnu.org>, 30290@debbugs.gnu.org
Subject: bug#30290: guix-daemon slows to a crawl when a substitute server is offline
Date: Wed, 09 Jun 2021 23:34:41 +0200	[thread overview]
Message-ID: <86y2bilo26.fsf@gmail.com> (raw)
In-Reply-To: <868s6cb4ji.fsf@gmail.com> (zimoun's message of "Wed, 24 Mar 2021 22:55:13 +0100")

Hi,


On Wed, 24 Mar 2021 at 22:55, zimoun <zimon.toutoune@gmail.com> wrote:
> On Mon, 29 Jan 2018 at 22:07, Maxim Cournoyer <maxim.cournoyer@gmail.com> wrote:
>> When a substitute server used by guix-daemon is offline, the daemon will
>> keep attempting to connect to it, even when it shouldn't need any data
>> (ran 'sudo guix system reconfigure my-config.scm' multiple times in a
>> row.
>>
>> With the disconnected server (bayfront in my case), that command would
>> take close to 8 minutes, with many system calls like:
>>
>> connect(14, {sa_family=AF_INET, sin_port=htons(443),
>> sin_addr=inet_addr("141.255.128.56")}, 16) = -1 EINPROGRESS
>>
>> which wasted 5 seconds each time.
>>
>> After removing this server from my substitute servers list, the same
>> operation (system reconfigure) is 8 times faster (1 minute).
>>
>> Suggestion: the daemon should stop trying to use the offline substitute
>> server after trying for X times, and print a warning about it.

[...]

> From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
> Date: Fri, 18 Dec 2020 22:04:04 -0500 (24 weeks, 4 days, 18 hours ago)
>
> I'm not sure if the recent offloading work that Mathieu did touched that
> topic.  I'd need to test the scenario.  Perhaps a system test would be
> useful.
> ----------
>
> From: Ludovic Courtès <ludo@gnu.org>
> Date: Tue, 22 Dec 2020 16:16:08 +0100
> Date: Tue, 22 Dec 2020 16:16:08 +0100 (24 weeks, 1 day, 6 hours ago)
>
> Is it still a problem?  Commit 4f5234be0378368e6af25925db46612838d25e58
> (Nov. 2019) added a table of unreachable hosts.  That way, a ‘guix
> substitute --query’ process won’t retry connections to an unreachable
> host.
> ----------
>
> From: Efraim Flashner <efraim@flashner.co.il>
> Date: Mon, 28 Dec 2020 14:19:02 +0200
> Date: Mon, 28 Dec 2020 14:19:02 +0200 (23 weeks, 2 days, 9 hours ago)
>
> Occasionally my internet drops itself, and I find I'm left forever
> waiting for a timeout to see what sources I have cached locally.
> ----------

What is the current stats of this bug?   Is it still happening with the
recent improvements of Cuirass?

Cheers,
simon




  reply	other threads:[~2021-06-09 21:44 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-30  3:07 bug#30290: guix-daemon slows to a crawl when a substitute server is offline Maxim Cournoyer
2020-12-03  0:20 ` zimoun
2020-12-19  3:04   ` Maxim Cournoyer
2020-12-22 15:16 ` Ludovic Courtès
2020-12-28 12:19   ` Efraim Flashner
2021-03-24 21:55 ` zimoun
2021-06-09 21:34   ` zimoun [this message]
2021-07-13  8:49     ` zimoun
2021-08-18 11:19       ` zimoun
2021-08-18 13:18       ` Maxim Cournoyer
2021-08-19  1:54         ` Maxim Cournoyer
2021-08-19  2:25           ` Maxim Cournoyer
2022-03-23 10:50             ` zimoun
2022-10-08 14:57               ` zimoun
2022-10-10  3:03                 ` Maxim Cournoyer

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