Re: Gather performance analysis

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>
Cc: Dilip Kumar <dilipbalaut(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Gather performance analysis
Date: 2021-09-23 23:43:00
Message-ID: CA+TgmoZ0SE3O6qNRcELZh=D6XRTtHxCiLNPm-PD2jORsqpeELw@mail.gmail.com
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On Thu, Sep 23, 2021 at 5:36 PM Tomas Vondra
<tomas(dot)vondra(at)enterprisedb(dot)com> wrote:
> (c) This can't explain the slowdown for cases without any Gather nodes
> (and it's ~17%, so unlikely due to binary layout).

Yeah, but none of the modified code would even execute in those cases,
so it's either binary layout, something wrong in your test
environment, or gremlins.

--
Robert Haas
EDB: http://www.enterprisedb.com

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