Re: PG15 beta1 sort performance regression due to Generation context change

From: David Rowley <dgrowleyml(at)gmail(dot)com>
To: Peter Geoghegan <pg(at)bowt(dot)ie>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, Andres Freund <andres(at)anarazel(dot)de>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: PG15 beta1 sort performance regression due to Generation context change
Date: 2022-05-30 22:04:36
Message-ID: CAApHDvrygSupkywcFkTUKEvcpv6OJPYYMbxynd7JKCxFG-9fmw@mail.gmail.com
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On Tue, 31 May 2022 at 09:48, Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> Shouldn't this be using the geometric mean rather than the arithmetic
> mean? That's pretty standard practice when summarizing a set of
> benchmark results that are expressed as ratios to some baseline.

Maybe just comparing the SUM of the seconds of each version is the
best way. That comes out to 86.6%

David

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