| From: | Junwang Zhao <zhjwpku(at)gmail(dot)com> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz> |
| 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 04:20:11 |
| Message-ID: | CAEG8a3+Y+qWU-qSzV4-GF2oQVSaCDoJ-mHTTqBZFPfQWhWuBfA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Feb 1, 2024 at 11:56 AM Michael Paquier <michael(at)paquier(dot)xyz> wrote:
>
> 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.
Yeah, with HEAD. I'm on ubuntu 22.04, I did not change any gucs, maybe I should
set a higher shared_buffers? But I dought that's related ;(
> --
> Michael
--
Regards
Junwang Zhao
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