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From: Nazir Bilal Yavuz <byavuz81@gmail.com>
Date: Sun, 8 Mar 2026 13:31:32 +0300
Message-ID: 
 <CAN55FZ1k2sOZn1qkDDVTX8Z1t99ZUkywBhdp_43euDHaAi5bRA@mail.gmail.com>
Subject: Re: Speed up COPY FROM text/CSV parsing using SIMD
To: KAZAR Ayoub <ma_kazar@esi.dz>
Cc: Nathan Bossart <nathandbossart@gmail.com>,
 Manni Wood <manni.wood@enterprisedb.com>,
	Andrew Dunstan <andrew@dunslane.net>, Neil Conway <neil.conway@gmail.com>,
	Shinya Kato <shinya11.kato@gmail.com>,
	PostgreSQL-development <pgsql-hackers@postgresql.org>
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Hi,

On Sat, 7 Mar 2026 at 02:31, KAZAR Ayoub <ma_kazar@esi.dz> wrote:
>
> On Sat, Mar 7, 2026 at 12:13=E2=80=AFAM Nathan Bossart <nathandbossart@gm=
ail.com> wrote:
>>
>> On Fri, Mar 06, 2026 at 03:25:46PM -0600, Manni Wood wrote:
>> > Well, golly! Look at these numbers. Old master with no lz4, your v11 p=
atch
>> > with no lz4, and then your v11 patch with lz4 compiled in.
>>
>> I'm appreciative of all the benchmarking that you and others are doing, =
but
>> wouldn't we be more interested in the difference between "old master wit=
h
>> lz4" and "v11 with lz4"?  Else, we have multiple variables in play.
>
> Yes I agree because the lz4 effect doesn't prove anything for the SIMD pa=
tch itself right ? So basically a comparison for the SIMD effect should be =
"master with/out lz4 vs patched with/out lz4, respectively and nothing more=
!", is this correct ?

Yes, I think 'master with/out lz4 vs patched with/out lz4,
respectively' is enough to determine the effect of the SIMD patch.

--=20
Regards,
Nazir Bilal Yavuz
Microsoft