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From: Mathieu Othacehe <othacehe@gnu.org>
To: 43552@debbugs.gnu.org
Subject: [bug#43552] [PATCH] Add watchdog support.
Date: Tue, 22 Sep 2020 10:34:03 +0200	[thread overview]
Message-ID: <87blhy1a84.fsf@gnu.org> (raw)
In-Reply-To: <20200921164908.1396570-1-othacehe@gnu.org> (Mathieu Othacehe's message of "Mon, 21 Sep 2020 18:49:08 +0200")


Hello,

> I've noticed that during several hours all Cuirass fibers seem to be
> stucked. I suspect that this is because a fiber is doing a blocking action,
> hence preventing its scheduler to run other fibers.

I think the issue is that we are communicating with guix-daemon over a
blocking socket. When Cuirass calls "build-derivations", and the "read"
over guix-daemon socket blocks, the whole Fiber scheduler is also
blocked.

As the GC is running for 6 - 7 hours a day[1], a Fiber scheduler is also
blocked for that duration. There's still some activity happening on
other schedulers, but that's still quite unfortunate. For instance,
nothing has been fetched since 4:00 this morning.

Thanks,

Mathieu

[1]: https://issues.guix.gnu.org/24937




  reply	other threads:[~2020-09-22  8:35 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-21 16:49 [bug#43552] [PATCH] Add watchdog support Mathieu Othacehe
2020-09-22  8:34 ` Mathieu Othacehe [this message]
2020-09-29 15:05 ` bug#43552: " Mathieu Othacehe

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