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: 2021-05-05 02:27:40
Message-ID: CA+hUKG+0agJcHA7qYPVfq8zZGSc84z-7+BSdvxbaZfJeSAmF=Q@mail.gmail.com
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On Wed, May 5, 2021 at 2:12 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
> It might be interesting to know how that 40ms time scales as you add
> more workers. ...

Another thought: I'd also try tests like that in large databases (ie
large virtual memory) vs small ones, and with and without huge/locked
memory pages configured[1], to see how much of the overhead is due to
virtual memory work (though I know nothing about Windows VM, it's just
an idea).

[1] https://www.postgresql.org/docs/13/runtime-config-resource.html#GUC-HUGE-PAGES

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