Re: Make COPY format extendable: Extract COPY TO format implementations

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: Junwang Zhao <zhjwpku(at)gmail(dot)com>
Cc: Sutou Kouhei <kou(at)clear-code(dot)com>, sawada(dot)mshk(at)gmail(dot)com, andrew(at)dunslane(dot)net, nathandbossart(at)gmail(dot)com, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Make COPY format extendable: Extract COPY TO format implementations
Date: 2024-02-01 03:56:22
Message-ID: ZbsWZgYZjkXh9hNO@paquier.xyz
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On Thu, Feb 01, 2024 at 11:43:07AM +0800, Junwang Zhao wrote:
> The first 6 rounds are like 10% better than the later 9 rounds, is this normal?

Even with HEAD? Perhaps you have some OS cache eviction in play here?
FWIW, I'm not seeing any of that with longer runs after 7~ tries in a
loop of 15.
--
Michael

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