Horton

Re: Gather performance analysis

Robert Haas <robertmhaas@gmail.com>

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From: Robert Haas <robertmhaas@gmail.com>
To: Tomas Vondra <tomas.vondra@enterprisedb.com>
Cc: Dilip Kumar <dilipbalaut@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2021-09-23T23:43:00Z
Lists: pgsql-hackers 
On Thu, Sep 23, 2021 at 5:36 PM Tomas Vondra
<tomas.vondra@enterprisedb.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

Commits

  1. shm_mq: Update mq_bytes_written less often.