Re: Huge performance penalty with parallel queries in Windows x64 v. Linux x64

From: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
To: Hans Buschmann <buschmann(at)nidsa(dot)net>
Cc: "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Re: Huge performance penalty with parallel queries in Windows x64 v. Linux x64
Date: 2021-05-04 01:38:59
Message-ID: CA+hUKG+d+qrOgwU2sqG09De7W6WJp7edWwURcip+_JxoCzxd4A@mail.gmail.com
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On Tue, May 4, 2021 at 4:05 AM Hans Buschmann <buschmann(at)nidsa(dot)net> wrote:
> The main difference is the time shown for the Gather Merge step (65 ms vs. 7 ms)

No Windows here, but could it be super slow at launching workers? How
does a trivial parallel query compare, something like?

SET force_parallel_mode = on;
EXPLAIN ANALYZE SELECT 42;

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