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From: Tom Lane <[email protected]>
To: Joel Jacobson <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: Optimize LISTEN/NOTIFY
Date: Sat, 12 Jul 2025 19:18:40 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

"Joel Jacobson" <[email protected]> writes:
> The attached proof-of-concept patch proposes a straightforward
> optimization for the single-listener case. It introduces a shared-memory
> hash table mapping (dboid, channelname) to the ProcNumber of a single
> listener.

What does that do to the cost and parallelizability of LISTEN/UNLISTEN?

> The patch also includes a "wake only tail" optimization (contributed by
> Marko Tikkaja) to help prevent backends from falling too far behind.

Coulda sworn we dealt with that case some years ago.  In any case,
if it's independent of the other idea it should probably get its
own thread.

			regards, tom lane

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