Re: [HACKERS] Clock with Adaptive Replacement

From: Andres Freund <andres(at)anarazel(dot)de>
To: Andrey Borodin <x4mmm(at)yandex-team(dot)ru>
Cc: Юрий Соколов <funny(dot)falcon(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] Clock with Adaptive Replacement
Date: 2018-04-30 18:15:15
Message-ID: 20180430181515.gu7pei6sg6wbkqcq@alap3.anarazel.de
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Hi,

On 2018-04-30 15:39:08 +0500, Andrey Borodin wrote:
> I suspect that performance benefits can be not that big or even
> marginal, if we do not extend comprehensive eviction strategy with
> bgwriter fixes and O_DIRECT.

If so, then the improvements aren't real. Bgwriter doesn't matter for
read-only workloads. O_DIRECT doesn't matter much if shared_buffers are
60+% of OS memory. And even disregarding that, you can just compute
cache hit ratios to see whether things are improving.

Greetings,

Andres Freund

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