Horton

Re: Track IO times in pg_stat_io

Bertrand Drouvot <bertranddrouvot.pg@gmail.com>

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From: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: Melanie Plageman <melanieplageman@gmail.com>, Pg Hackers <pgsql-hackers@postgresql.org>, Maciek Sakrejda <m.sakrejda@gmail.com>, Justin Pryzby <pryzby@telsasoft.com>, smilingsamay@gmail.com, Kyotaro Horiguchi <horikyota.ntt@gmail.com>, Lukas Fittl <lukas@fittl.com>, Magnus Hagander <magnus@hagander.net>, Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2024-09-02T15:00:32Z
Lists: pgsql-hackers 
Hi,

On Fri, Aug 23, 2024 at 07:32:16AM +0000, Bertrand Drouvot wrote:
> Hi,
> 
> On Wed, Mar 08, 2023 at 04:34:38PM -0800, Andres Freund wrote:
> > On 2023-03-08 12:55:34 +0100, Drouvot, Bertrand wrote:
> > > - pg_stat_io is "global" across all sessions. So, even if one session is doing some "testing" and needs to turn track_io_timing on, then it
> > > is even not sure it's only reflecting its own testing (as other sessions may have turned it on too).
> > 
> > I think for 17 we should provide access to per-existing-connection pg_stat_io
> > stats, and also provide a database aggregated version. Neither should be
> > particularly hard.
> 
> FWIW, I think that would be great and plan to have a look at this (unless someone
> beats me to it).

FWIW, here is the patch proposal for per backend I/O statistics [1].

[1]: https://www.postgresql.org/message-id/ZtXR%2BCtkEVVE/LHF%40ip-10-97-1-34.eu-west-3.compute.internal

Regards,

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

Commits

  1. Improve IO accounting for temp relation writes