Re: MultiXact\SLRU buffers configuration

From: i(dot)lazarev(at)postgrespro(dot)ru
To: Andrey Borodin <x4mmm(at)yandex-team(dot)ru>
Cc: 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>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Anastasia Lubennikova <a(dot)lubennikova(at)postgrespro(dot)ru>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: MultiXact\SLRU buffers configuration
Date: 2022-08-19 15:48:41
Message-ID: 01b29498849ef738be9e786660f98639@postgrespro.ru
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Andrey Borodin wrote 2022-08-18 06:35:
>
> I like the idea of one knob instead of one per each SLRU. Maybe we
> even could deduce sane value from NBuffers? That would effectively
> lead to 0 knobs :)
>
> Your patch have a prefix "v22-0006", does it mean there are 5 previous
> steps of the patchset?
>
> Thank you!
>
>
> Best regards, Andrey Borodin.

Not sure it's possible to deduce from NBuffers only.
slru_buffers_scale_shift looks like relief valve for systems with ultra
scaled NBuffers.

Regarding v22-0006 I just tried to choose index unique for this thread
so now it's fixed to 0001 indexing.

Attachment Content-Type Size
v23-0001-bucketed-SLRUs-simplified.patch text/x-diff 18.0 KB

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