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Re: Big performance slowdown from 11.2 to 13.3 - Mailing list pgsql-performance

From Peter Geoghegan
Subject Re: Big performance slowdown from 11.2 to 13.3
Date
Msg-id CAH2-WznobAhYKsY3jsu55LbVbiOSTQDo3+jH2NbBPhw3FxjYQw@mail.gmail.com
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In response to Re: Big performance slowdown from 11.2 to 13.3  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Big performance slowdown from 11.2 to 13.3  (David Rowley <dgrowleyml@gmail.com>)
RE: Big performance slowdown from 11.2 to 13.3  ("ldh@laurent-hasson.com" <ldh@laurent-hasson.com>)
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On Thu, Jul 22, 2021 at 8:45 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> 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?

I wonder if this has something to do with the way that the input data
is clustered. I recall noticing that that could significantly alter
the behavior of HashAggs as of Postgres 13.

-- 
Peter Geoghegan

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