On Wed, May 11, 2022 at 12:39:41PM +1200, David Rowley wrote: > On Wed, 11 May 2022 at 03:44, Bruce Momjian <br...@momjian.us> wrote: > > > > I have completed the first draft of the PG 15 release notes and you can > > see the results here: > > > > https://momjian.us/pgsql_docs/release-15.html > > Thanks for doing that tedious work. > > I think the sort improvements done in v15 are worth a mention under > General Performance. The commits for this were 91e9e89dc, 40af10b57 > and 697492434. I've been running a few benchmarks between v14 and v15 > over the past few days and a fairly average case speedup is about 25%. > but there are cases where I've seen up to 400%. I think the increase > is to an extent that we maybe should have considered making tweaks in > cost_tuplesort(). I saw some plans that ran in about 60% of the time > by disabling Hash Agg and allowing Sort / Group Agg to do the work.
Good point. Do you have any suggested text? I can't really see it clearly based on the commits, except "sorting is faster". -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com Indecision is a decision. Inaction is an action. Mark Batterson
