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Date: Mon, 20 Oct 2025 07:12:18 +0200
From: "Joel Jacobson" <joel@compiler.org>
To: "Tom Lane" <tgl@sss.pgh.pa.us>
Cc: "Chao Li" <li.evan.chao@gmail.com>,
 pgsql-hackers <pgsql-hackers@postgresql.org>
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Subject: Re: Optimize LISTEN/NOTIFY
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On Mon, Oct 20, 2025, at 00:10, Joel Jacobson wrote:
> Attachments:
> * 0001-optimize_listen_notify-v20.patch
> * 0002-optimize_listen_notify-v20.patch
> * 0002-optimize_listen_notify-v20-alt1.txt
> * 0002-optimize_listen_notify-v20-alt3.txt
> * 0002-optimize_listen_notify-v20-alt2.txt

Attaching a new alt1 version, that fixes the mistake of using max(pos,
advisoryPos) for lag calculation, which is wrong, since in alt1 it's the
backend itself that updates its 'pos' when it wakes up, and it's 'pos'
that asyncQueueAdvanceTail looks at, in alt1.

/Joel
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