On Mon, Feb 16, 2026 at 11:04:58AM -0600, Nathan Bossart wrote:
> On Fri, Feb 13, 2026 at 09:34:13PM -0600, Manni Wood wrote:
>> v7-0001 + v7-0002 applied to master certainly seems promising: nice to see
>> speed improvements across the board on both x86 and arm!
>
> Thanks for testing. Based on these results, I think we can abandon 0002,
> at least for now.
Have you tested small rows, i.e., less than 16 bytes per row? I'm
wondering if that regresses at all.
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nathan
I ran some tests using narrow rows that look like this:
$ head t_none.txt
BB AA
BB AA
BB AA
$ head t_none.csv
BB,AA
BB,AA
BB,AA
$ head t_escape.txt
B\\B A\\A
B\\B A\\A
B\\B A\\A
$ head t_quote.csv
"B""B","A""A"
"B""B","A""A"
"B""B","A""A"
Here are the results on my x86 tower and my arm raspberry pi 5:
x86 NARROW master copy from
TXT : 2477.022500 ms
CSV : 2825.095500 ms
TXT with 1/3 escapes: 2620.575000 ms
CSV with 1/3 quotes: 3249.058750 ms
x86 NARROW v70001 copy from
TXT : 2475.659000 ms 0.055046% improvement
CSV : 2421.976750 ms 14.269208% improvement
TXT with 1/3 escapes: 2660.953750 ms -1.540836% regression
CSV with 1/3 quotes: 3255.546750 ms -0.199689% regression
x86 NARROW v70002 copy from
TXT : 2481.372250 ms -0.175604% regression
CSV : 2437.541250 ms 13.718271% improvement
TXT with 1/3 escapes: 2646.300000 ms -0.981655% regression
CSV with 1/3 quotes: 3202.014500 ms 1.447935% improvement
arm NARROW master copy from
TXT : 2294.270500 ms
CSV : 2085.839000 ms
TXT with 1/3 escapes: 2467.966000 ms
CSV with 1/3 quotes: 2485.533000 ms
arm NARROW v70001 copy from
TXT : 1982.497500 ms 13.589200% improvement
CSV : 2005.829500 ms 3.835843% improvement
TXT with 1/3 escapes: 2111.778250 ms 14.432442% improvement
CSV with 1/3 quotes: 2441.370000 ms 1.776802% improvement
arm NARROW v70002 copy from
TXT : 1975.982250 ms 13.873179% improvement
CSV : 2022.744000 ms 3.024922% improvement
TXT with 1/3 escapes: 2080.273000 ms 15.709009% improvement
CSV with 1/3 quotes: 2476.819000 ms 0.350589% improvement
Hope this helps!
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