| From: | Andrey Borodin <x4mmm(at)yandex-team(dot)ru> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | 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: | 2022-02-20 07:35:06 |
| Message-ID: | 01FF6FFC-7379-43EA-B04A-673C98ABFAAF@yandex-team.ru |
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| Lists: | pgsql-hackers |
> On 20 Feb 2022, at 02:42, Andres Freund <andres(at)anarazel(dot)de> wrote:
>
> On 2022-02-20 10:38:53 +1300, Thomas Munro wrote:
>> Back to this patch: assuming we can settle on a good-enough-for-now
>> replacement algorithm, do we want to add this set of 7 GUCs? Does
>> anyone else want to weigh in on that?
>
> I'm -0.2 on it, given that we have a better path forward.
That’s a really good path forward, but it's discussed at least for 3.5 years[0]. And guaranteed not to be there until 2023. Gilles, Shawn, Dmitry expressed their opinion in lines with that the patch “is a must-have” referring to real pathological performance degradation inflicted by SLRU cache starvation. And I can remember dozen of other incidents that would not happen if the patch was applied, e.g. this post is referring to the patch as a cure [1].
Best regards, Andrey Borodin.
[0] https://www.postgresql.org/message-id/flat/20180814213500.GA74618%4060f81dc409fc.ant.amazon.com
[1] https://about.gitlab.com/blog/2021/09/29/why-we-spent-the-last-month-eliminating-postgresql-subtransactions/#what-can-we-do-about-getting-rid-of-nessie
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