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From: Jeff Davis <pgsql@j-davis.com>
To: David Rowley <dgrowleyml@gmail.com>
To: Stephen Frost <sfrost@snowman.net>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: Bruce Momjian <bruce@momjian.us>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Justin Pryzby <pryzby@telsasoft.com>
Cc: Melanie Plageman <melanieplageman@gmail.com>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: pgsql-hackers@postgresql.org <pgsql-hackers@postgresql.org>
Subject: Re: Default setting for enable_hashagg_disk
Date: Mon, 13 Jul 2020 07:51:03 -0700
Message-ID: <5cf74833a830e76cc7cc7506aa77bd6ab0c94f4c.camel@j-davis.com> (raw)
In-Reply-To: <CAApHDvqfJzD3TSav0Qr6_F-stx+cKqh9B+PTRBFMa4u4SYpjwg@mail.gmail.com>
References: <20200709225840.GE12375@tamriel.snowman.net>
	<CAH2-WzmbycnZnxFTYnwkSkCPTVQbRoLiuEvo8gkZCKiQTL8GAQ@mail.gmail.com>
	<20200710000842.GF12375@tamriel.snowman.net>
	<CAH2-Wz=9f-gxPmqL9Lak0xddPmH0bgfAEioK+2BwTkuzyrtZEQ@mail.gmail.com>
	<20200710141714.GI12375@tamriel.snowman.net>
	<CAH2-Wzkd7cWK-mMPMb63JXxj2QFMan6hw+cQjdJKvdtCOpR7Ng@mail.gmail.com>
	<20200710215012.GN12375@tamriel.snowman.net>
	<2165606.1594418399@sss.pgh.pa.us>
	<20200711142213.GP12375@tamriel.snowman.net>
	<CAH2-Wz=L1ogoxCZC417SKC+JawT+O7c_hHOcsHzrYy0eLo+O+Q@mail.gmail.com>
	<20200713131342.GT12375@tamriel.snowman.net>
	<CAApHDvqfJzD3TSav0Qr6_F-stx+cKqh9B+PTRBFMa4u4SYpjwg@mail.gmail.com>

On Tue, 2020-07-14 at 02:25 +1200, David Rowley wrote:
> Updated summary:
> * For hash_mem = Tomas [7], Justin [16]
> * For hash_mem_multiplier with a default > 1.0 = DavidG [21]
> * For hash_mem_multiplier with default = 1.0 =  PeterG [15][0], Tom
> [20][24]

I am OK with these options, but I still prefer a simple escape hatch.

> * Maybe do nothing until we see how things go during beta = Bruce
> [3], Amit [10]
> * Just let users set work_mem = Stephen [21], Alvaro [4] (Alvaro
> changed his mind after Andres pointed out that changes other nodes in
> the plan too [25])

I am not on board with these options.

Regards,
	Jeff Davis







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