Horton

Re: postmaster uses more CPU in 18 beta1 with io_method=io_uring

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: MARK CALLAGHAN <mdcallag@gmail.com>, pgsql-hackers@lists.postgresql.org, Heikki Linnakangas <hlinnaka@iki.fi>, Tomas Vondra <tomas@vondra.me>, Nathan Bossart <nathandbossart@gmail.com>
Date: 2025-06-05T18:32:10Z
Lists: pgsql-hackers

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Hi,

On 2025-06-05 12:47:52 -0400, Tom Lane wrote:
> Andres Freund <andres@anarazel.de> writes:
> > I think this is a big enough pitfall that it's, obviously assuming the patch
> > has a sensible complexity, worth fixing this in 18. RMT, anyone, what do you
> > think?
> 
> Let's see the patch ... but yeah, I'd rather not ship 18 like this.

I've attached a first draft.

I can't make heads or tails of the ordering in configure.ac, so the function
test is probably in the wrong place.

Greetings,

Andres

Commits

  1. aio: Combine io_uring memory mappings, if supported