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From: Mathieu Othacehe <othacehe@gnu.org>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: 43564@debbugs.gnu.org
Subject: bug#43564: cuirass: Contention while registering new builds.
Date: Mon, 05 Oct 2020 15:09:06 +0200	[thread overview]
Message-ID: <87k0w47rbh.fsf@gnu.org> (raw)
In-Reply-To: <87v9fo27vz.fsf@gnu.org> ("Ludovic Courtès"'s message of "Mon, 05 Oct 2020 14:07:44 +0200")


Hey Ludo,

> Isn’t that the real problem, that we’re doing one transaction per
> derivation?

Is it really better in term of performance to send batch of queries
within a single transaction? I haven't tried it yet.

I think that the real bottleneck was having N fibers fighting over 4
workers to execute large number of insertions. Having all those queries
done by workers dedicated to registration in a single pass seems to
improve a lot the situation.

Maybe having those registration workers posting unique transactions
containing all the queries would be even more beneficial.

Thanks,

Mathieu




  reply	other threads:[~2020-10-05 13:10 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
2020-10-04 11:12     ` Mathieu Othacehe
2020-10-05 12:07   ` Ludovic Courtès
2020-10-05 13:09     ` Mathieu Othacehe [this message]
2020-10-09  7:59       ` Ludovic Courtès

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