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.
-- 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
