Re: AIO v2.5

From: Tomas Vondra <tomas(at)vondra(dot)me>
To: Andres Freund <andres(at)anarazel(dot)de>, Antonin Houska <ah(at)cybertec(dot)at>
Cc: Noah Misch <noah(at)leadboat(dot)com>, pgsql-hackers(at)postgresql(dot)org, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Robert Haas <robertmhaas(at)gmail(dot)com>, Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>
Subject: Re: AIO v2.5
Date: 2025-04-22 22:38:01
Message-ID: 2dea8882-537e-46a7-a321-ed69f3041226@vondra.me
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On 3/18/25 21:12, Andres Freund wrote:
> Hi,
>
> Attached is v2.10, with the following changes:
>
> ...
>
> - committed io_method=worker
>

There's an open item related to this commit (247ce06b883d), based on:

For now the default io_method is changed to "worker". We should re-
evaluate that around beta1, we might want to be careful and set the
default to "sync" for 18.

FWIW the open item is in the "recheck mid-beta" section, but the commit
message says "around beta1" which is not that far away (especially if we
choose to do beta1 on May 8, with the minor releases).

What information we need to gather to make the decision and who's
expected to do it? I assume someone needs to do run some benchmarks, but
is anyone working on it already? What benchmarks, what platforms?

FWIW I'm asking because of the RMT, but I'm also willing to do some of
the tests, if needed - but it'd be good to get some guidance.

regards

--
Tomas Vondra

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