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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 11:22:54 -0500
Message-ID: <20210722162254.GG19620@telsasoft.com> (raw)
In-Reply-To: <MN2PR15MB2560C1E738F58FD71B71255D85E49@MN2PR15MB2560.namprd15.prod.outlook.com>
References: <MN2PR15MB2560C1A890DC07F9359FB56285E39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<732758.1626911007@sss.pgh.pa.us>
	<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>

On Thu, Jul 22, 2021 at 04:16:34PM +0000, ldh@laurent-hasson.com wrote:
> Is it fair then to deduce that the total memory usage would be 2,400,305kB + 126,560kB? Is this what under the covers V11 is consuming more or less?

It might be helpful to know how much RAM v11 is using.

Could you run the query with log_executor_stats=on; client_min_messages=debug;

The interesting part is this:
!       7808 kB max resident size

-- 
Justin





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