From: Mathieu Othacehe <othacehe@gnu.org>
To: 43564@debbugs.gnu.org
Subject: bug#43564: cuirass: Contention while registering new builds.
Date: Tue, 29 Sep 2020 17:02:14 +0200 [thread overview]
Message-ID: <87h7rglj7t.fsf@gnu.org> (raw)
In-Reply-To: <87k0wee3ud.fsf@gnu.org> (Mathieu Othacehe's message of "Mon, 28 Sep 2020 09:51:38 +0200")
Hello,
> In the best case of one pending evaluation, the registration duration is
> reduced from 1800 seconds to 320 seconds. I think that the gain is way
> larger when there are multiple pending evaluations.
>
> Pushed a fix as 461e07e14e1c8013343c0a2cb26c0e022e10d5e4.
While this improves the situation, another evaluation contention episode
occurred this afternoon (evaluations 16920 to 16938).
Even though reading queries are cheaper, I guess that when 10 fibers try
to execute 50k read queries, there's some contention in the
communication with the 4 database workers.
I'm trying locally to spawn database workers dedicated to registration,
that execute the evaluation queries in a single batch. Let's see if it
helps.
Thanks,
Mathieu
next prev parent reply other threads:[~2020-09-29 15:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-22 16:52 bug#43564: cuirass: Contention while registering new builds Mathieu Othacehe
2020-09-28 7:51 ` Mathieu Othacehe
2020-09-28 8:17 ` Mathieu Othacehe
2020-09-29 15:02 ` Mathieu Othacehe [this message]
2020-10-04 11:12 ` Mathieu Othacehe
2020-10-05 12:07 ` Ludovic Courtès
2020-10-05 13:09 ` Mathieu Othacehe
2020-10-09 7:59 ` Ludovic Courtès
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