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From: Tom Lane <tgl@sss.pgh.pa.us>
To: ldh@laurent-hasson.com <ldh@laurent-hasson.com>
Cc: David Rowley <dgrowleyml@gmail.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Big performance slowdown from 11.2 to 13.3
Date: Thu, 22 Jul 2021 11:45:02 -0400
Message-ID: <784576.1626968702@sss.pgh.pa.us> (raw)
In-Reply-To: <MN2PR15MB2560E4574A6E2B5AED2C03CB85E49@MN2PR15MB2560.namprd15.prod.outlook.com>
References: <MN2PR15MB25601E80A9B6D1BA6F592B1985E39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<20210721191528.GC19620@telsasoft.com>
	<MN2PR15MB256016E33F00DE60B96F02D385E39@MN2PR15MB2560.namprd15.prod.outlook.com>
	<CAH2-Wzm3rSAWHyENb3T0X8M_qdYjF1t7rntkMJ2kDiuhVOHx3g@mail.gmail.com>
	<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>

"ldh@laurent-hasson.com" <ldh@laurent-hasson.com> writes:
> So, I went possibly nuclear, and still no cigar. Something's not right.
> - hash_mem_multiplier = '10'
> - work_mem = '1GB'

> The results are
> 	Batches: 5  Memory Usage: 2,449,457kB  Disk Usage: 105,936kB
> 	Execution Time: 1,837,126.766 ms

> It's still spilling to disk and seems to cap at 2.5GB of memory usage in spite of configuration.

That is ... weird.  Maybe you have found a bug in the spill-to-disk logic;
it's quite new after all.  Can you extract a self-contained test case that
behaves this way?

			regards, tom lane





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