Re: [PATCH] Change wait_time column of pg_stat_lock to double precision

From: Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>
To: Michael Paquier <michael(at)paquier(dot)xyz>
Cc: Tatsuya Kawata <kawatatatsuya0913(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: [PATCH] Change wait_time column of pg_stat_lock to double precision
Date: 2026-06-29 04:56:11
Message-ID: akH668FoacFKlLPY@bdtpg
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Hi,

On Mon, Jun 29, 2026 at 01:52:54PM +0900, Michael Paquier wrote:
> On Mon, Jun 29, 2026 at 04:27:55AM +0000, Bertrand Drouvot wrote:
> > postgres=# select read_time from pg_stat_io where read_time > 0;
> > read_time
> > ---------------------
> > 2.2640000000000002
> > 0.08700000000000001
> >
> > Maybe it should be changed to?
>
> pg_stat_io with track_io_timing enabled shows the same thing.

Yeah, I agree, my query above is querying pg_stat_io. I agree that it makes
sense to have both using pg_stat_us_to_ms(), I'm just wondering if pg_stat_us_to_ms()
should be changed as I did propose.

Regards,

--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com

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