pg.ddx.io  pgsql-performance@postgresql.org mailing list archive  

help / color / mirror / Atom feed
From: Justin Pryzby <pryzby@telsasoft.com>
To: ldh@laurent-hasson.com
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: David Rowley <dgrowleyml@gmail.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: pgsql-performance@postgresql.org
Subject: Re: Big performance slowdown from 11.2 to 13.3
Date: Thu, 22 Jul 2021 11:35:56 -0500
Message-ID: <20210722163556.GH19620@telsasoft.com> (raw)
In-Reply-To: <MN2PR15MB2560301C87A7F78ACBC0A05485E49@MN2PR15MB2560.namprd15.prod.outlook.com>
References: <MN2PR15MB2560778595BB7AF6E691B26785E39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<MN2PR15MB2560D429866BD65A70574A6C85E49@MN2PR15MB2560.namprd15.prod.outlook.com>
	<CAApHDvqoF7y7SQjGT=940njnAd_CUcUG6oRYChcP_+eJyuNiug@mail.gmail.com>
	<MN2PR15MB25603D3CE06C8F9C312EA58985E49@MN2PR15MB2560.namprd15.prod.outlook.com>
	<MN2PR15MB2560E4574A6E2B5AED2C03CB85E49@MN2PR15MB2560.namprd15.prod.outlook.com>
	<784576.1626968702@sss.pgh.pa.us>
	<785218.1626969409@sss.pgh.pa.us>
	<MN2PR15MB2560C1E738F58FD71B71255D85E49@MN2PR15MB2560.namprd15.prod.outlook.com>
	<20210722162254.GG19620@telsasoft.com>
	<MN2PR15MB2560301C87A7F78ACBC0A05485E49@MN2PR15MB2560.namprd15.prod.outlook.com>

On Thu, Jul 22, 2021 at 04:30:00PM +0000, ldh@laurent-hasson.com wrote:
> Hello Justin,
> 
> > log_executor_stats=on; client_min_messages=debug;
> 
> Would the results then come in EXPLAIN or would I need to pick something up from the logs?

If you're running with psql, and client_min_messages=debug, then it'll show up
as a debug message to the client:

ts=# SET log_executor_stats=on; SET client_min_messages=debug; explain analyze SELECT 1;
SET
SET
LOG:  EXECUTOR STATISTICS
DETAIL:  ! system usage stats:
!       0.000011 s user, 0.000209 s system, 0.000219 s elapsed
!       [0.040608 s user, 0.020304 s system total]
!       7808 kB max resident size
...

It can but doesn't have to use "explain" - that just avoids showing the query
output, since it's not what's interesting here.

-- 
Justin





view thread (59+ messages)  latest in thread

Message-ID: <20210722163556.GH19620@telsasoft.com>
Permalink:  ../20210722163556.GH19620@telsasoft.com/
Also on:    postgresql.org/message-id/20210722163556.GH19620@telsasoft.com

 · 

reply
Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-performance@postgresql.org
  Cc: pryzby@telsasoft.com, ldh@laurent-hasson.com, tgl@sss.pgh.pa.us, dgrowleyml@gmail.com, pg@bowt.ie
  Subject: Re: Big performance slowdown from 11.2 to 13.3
  In-Reply-To: <20210722163556.GH19620@telsasoft.com>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox