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From: KAZAR Ayoub <ma_kazar@esi.dz>
Date: Sat, 31 Jan 2026 17:20:58 +0100
Message-ID: <CA+K2Ru=C_woAnd-3-pGHoNSTR8FOf=7eeSWE1xaLt9ojVWndVg@mail.gmail.com>
Subject: Re: Speed up COPY FROM text/CSV parsing using SIMD
To: Neil Conway <neil.conway@gmail.com>
Cc: Nazir Bilal Yavuz <byavuz81@gmail.com>, Manni Wood <manni.wood@enterprisedb.com>, 
	Nathan Bossart <nathandbossart@gmail.com>, Andrew Dunstan <andrew@dunslane.net>, 
	Shinya Kato <shinya11.kato@gmail.com>, 
	PostgreSQL-development <pgsql-hackers@postgresql.org>
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Hello,

On Wed, Jan 21, 2026 at 9:50=E2=80=AFPM Neil Conway <neil.conway@gmail.com>=
 wrote:

> A few suggestions:
>
> * I'm curious if we'll see better performance on large inputs if we flush
> to `line_buf` periodically (e.g., at least every few thousand bytes or so=
).
> Otherwise we might see poor data cache behavior if large inputs with no
> control characters get evicted before we've copied them over. See the
> approach taken in escape_json_with_len() in utils/adt/json.c
>
> So i gave this a try, attached is the small patch that has v3 + the
suggestion added, here are the results with different threshold for
line_buf refill:

Execution time compared to master:
Workload v3 v3.1 (2k) v3.1 (4k) v3.1 (8k) v3.1 (16k) v3.1 (20k) v3.1 (28k)
text/none -16.5% -17.4% -14.3% -12.6% -13.6% -10.5% -16.3%
text/esc +5.6% +11.1% +3.1% +7.6% +3.0% +4.9% +4.2%
csv/none -31.0% -29.9% -26.7% -30.1% -27.9% -30.2% -29.6%
csv/quote +0.2% -0.6% -0.4% -1.0% +0.1% +2.5% -1.0%

L1d cache miss rates:
Workload Master v3 v3.1 (2k) v3.1 (4k) v3.1 (8k) v3.1 (16k) v3.1 (20k) v3.1
(28k)
text/none 0.20% 0.23% 0.21% 0.22% 0.21% 0.21% 0.21% 0.22%
text/esc 0.21% 0.22% 0.22% 0.22% 0.22% 0.21% 0.22% 0.22%
csv/none 0.17% 0.22% 0.21% 0.22% 0.21% 0.21% 0.22% 0.22%
csv/quote 0.18% 0.22% 0.19% 0.20% 0.20% 0.19% 0.20% 0.20%
On my laptop I have 32KB L1 cache per core.
Results are super close, it is hard to see in the cache misses numbers but
execution times are saying other things, doing the periodic filling of
line_buf seems good to do.
If Manni can rerun the benchmarks on these too, it would be nice to confirm
this.


Regards,
Ayoub

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<div dir=3D"ltr"><div dir=3D"ltr"><div>Hello,</div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jan 21, 2026 at 9:50=
=E2=80=AFPM Neil Conway &lt;<a href=3D"mailto:neil.conway@gmail.com" target=
=3D"_blank">neil.conway@gmail.com</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr">A few suggestions:<br><br=
>* I&#39;m curious if we&#39;ll see better performance on large inputs if w=
e flush to `line_buf` periodically (e.g., at least every few thousand bytes=
 or so). Otherwise we might see poor data cache behavior if large inputs wi=
th no control characters get evicted before we&#39;ve copied them over. See=
 the approach taken in=C2=A0escape_json_with_len() in utils/adt/json.c<div>=
<br></div></div></blockquote><div>So i gave this a try, attached is the sma=
ll patch that has v3 + the suggestion added, here are the results with diff=
erent threshold for line_buf refill:</div><div><br></div><div>Execution tim=
e compared to master:<table><thead><tr><th>Workload</th><th>v3</th><th>v3.1=
 (2k)</th><th>v3.1 (4k)</th><th>v3.1 (8k)</th><th>v3.1 (16k)</th><th>v3.1 (=
20k)</th><th>v3.1 (28k)</th></tr></thead><tbody><tr><td>text/none</td><td>-=
16.5%</td><td>-17.4%</td><td>-14.3%</td><td>-12.6%</td><td>-13.6%</td><td>-=
10.5%</td><td>-16.3%</td></tr><tr><td>text/esc</td><td>+5.6%</td><td>+11.1%=
</td><td>+3.1%</td><td>+7.6%</td><td>+3.0%</td><td>+4.9%</td><td>+4.2%</td>=
</tr><tr><td>csv/none</td><td>-31.0%</td><td>-29.9%</td><td>-26.7%</td><td>=
-30.1%</td><td>-27.9%</td><td>-30.2%</td><td>-29.6%</td></tr><tr><td>csv/qu=
ote</td><td>+0.2%</td><td>-0.6%</td><td>-0.4%</td><td>-1.0%</td><td>+0.1%</=
td><td>+2.5%</td><td>-1.0%</td></tr></tbody></table></div><div><br></div><d=
iv>L1d cache miss rates:</div><div><table><thead><tr><th>Workload</th><th>M=
aster</th><th>v3</th><th>v3.1 (2k)</th><th>v3.1 (4k)</th><th>v3.1 (8k)</th>=
<th>v3.1 (16k)</th><th>v3.1 (20k)</th><th>v3.1 (28k)</th></tr></thead><tbod=
y><tr><td>text/none</td><td>0.20%</td><td>0.23%</td><td>0.21%</td><td>0.22%=
</td><td>0.21%</td><td>0.21%</td><td>0.21%</td><td>0.22%</td></tr><tr><td>t=
ext/esc</td><td>0.21%</td><td>0.22%</td><td>0.22%</td><td>0.22%</td><td>0.2=
2%</td><td>0.21%</td><td>0.22%</td><td>0.22%</td></tr><tr><td>csv/none</td>=
<td>0.17%</td><td>0.22%</td><td>0.21%</td><td>0.22%</td><td>0.21%</td><td>0=
.21%</td><td>0.22%</td><td>0.22%</td></tr><tr><td>csv/quote</td><td>0.18%</=
td><td>0.22%</td><td>0.19%</td><td>0.20%</td><td>0.20%</td><td>0.19%</td><t=
d>0.20%</td><td>0.20%</td></tr></tbody></table><br></div><div>On my=C2=A0la=
ptop I have=C2=A032KB L1 cache per core.</div><div>Results are super close,=
 it is hard to see in the cache misses=C2=A0numbers but execution times are=
 saying other things, doing the periodic filling of line_buf seems good to =
do.<br>If Manni can rerun the benchmarks on these too, it would be nice to =
confirm this.</div><div><br></div><div><br></div><div>Regards,<br></div><di=
v>Ayoub</div></div></div>
</div>

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