Re: MultiXact\SLRU buffers configuration

From: Andrey Borodin <x4mmm(at)yandex-team(dot)ru>
To: Thom Brown <thom(at)linux(dot)com>
Cc: Michael Paquier <michael(at)paquier(dot)xyz>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, vignesh C <vignesh21(at)gmail(dot)com>, Andrew Borodin <amborodin86(at)gmail(dot)com>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, Andres Freund <andres(at)anarazel(dot)de>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Gilles Darold <gilles(at)darold(dot)net>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, pgsql-hackers mailing list <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: MultiXact\SLRU buffers configuration
Date: 2025-07-28 17:23:24
Message-ID: 42B44AD2-9DA5-4500-8757-2673B3733426@yandex-team.ru
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Hi Thom!

> On 1 Nov 2024, at 00:25, Thom Brown <thom(at)linux(dot)com> wrote:
>
> Unfortunately I didn't gather much information when it was occuring, and prioritised getting rid of the process blocking replay. I just attached gdb to it, got a backtrace and then "print ProcessInterrupts()".

FWIW we diagnosed that problem in the recent thread "IPC/MultixactCreation on the Standby server" [0].
Proposed fix is non-trivial. I'm trying to asses how many reports we had about this problem. Did you ever observe this problem again?

Thanks!

Best regards, Andrey Borodin.

[0] https://www.postgresql.org/message-id/172e5723-d65f-4eec-b512-14beacb326ce@yandex.ru

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