Hello, I ran some long benchmarks on this, and I got stable results across multiple runs (few milliseconds difference)
This is on an Intel I7-1255U CPU with: sudo cpupower frequency-set --governor=performance sudo cpupower idle-set -D 0 echo "1" | sudo tee /sys/devices/system/cpu/intel_pstate/no_turbo WIDE (500k rows) TXT | none Master avg: 22,183 ms New avg: 20,435 ms Improvement: -7.88% CSV | none Master avg: 26,737 ms New avg: 24,625 ms Improvement: -7.90% TXT | escape Master avg: 26,720 ms New avg: 23,658 ms Improvement: -11.46% CSV | quote Master avg: 35,961 ms New avg: 33,317 ms Improvement: -7.35% -------------------------------------- NARROW (1.5M rows) TXT | none Master avg: 2,220 ms New avg: 2,125 ms Improvement: -4.28% CSV | none Master avg: 2,330 ms New avg: 2,145 ms Improvement: -7.92% TXT | escape Master avg: 2,425 ms New avg: 2,187 ms Improvement: -9.79% CSV | quote Master avg: 2,272 ms New avg: 2,253 ms Improvement: -0.85% No regressions as expected, overall this looks good. Regards, Ayoub On Thu, Feb 19, 2026 at 10:01 AM Nazir Bilal Yavuz <[email protected]> wrote: > Hi, > > On Thu, 19 Feb 2026 at 07:02, Manni Wood <[email protected]> > wrote: > > > > I took some time tonight to apply v8 to the latest master (759b03b2) on > my x86 tower and arm raspberry pi 5. > > > > Here are the results, using both narrow columns and the wider columns > we've been using througout: > > > > x86 master NARROW > > TXT : 2587.642000 ms > > CSV : 2621.759000 ms > > TXT with 1/3 escapes: 2707.933500 ms > > CSV with 1/3 quotes: 3254.896500 ms > > > > x86 v8 NARROW > > TXT : 2488.655250 ms 3.825365% improvement > > CSV : 2628.818000 ms -0.269247% regression > > TXT with 1/3 escapes: 2615.522000 ms 3.412621% improvement > > CSV with 1/3 quotes: 3446.368000 ms -5.882568% regression > > > > x86 master WIDE > > TXT : 30583.229500 ms > > CSV : 35054.533500 ms > > TXT with 1/3 escapes: 32767.421500 ms > > CSV with 1/3 quotes: 44214.163500 ms > > > > x86 v8 WIDE > > TXT : 26527.494250 ms 13.261305% improvement > > CSV : 33364.443750 ms 4.821316% improvement > > TXT with 1/3 escapes: 29320.648000 ms 10.518904% improvement > > CSV with 1/3 quotes: 42334.074750 ms 4.252232% improvement > > > > > > > > arm master NARROW > > TXT : 1999.401000 ms > > CSV : 2081.610750 ms > > TXT with 1/3 escapes: 2053.230250 ms > > CSV with 1/3 quotes: 2431.608750 ms > > > > arm v8 NARROW > > TXT : 1981.663750 ms 0.887128% improvement > > CSV : 2023.892500 ms 2.772769% improvement > > TXT with 1/3 escapes: 2004.215250 ms 2.387214% improvement > > CSV with 1/3 quotes: 2616.872750 ms -7.618989% regression > > > > arm master WIDE > > TXT : 9120.731750 ms > > CSV : 11114.478250 ms > > TXT with 1/3 escapes: 10338.124500 ms > > CSV with 1/3 quotes: 13404.430250 ms > > > > arm v8 WIDE > > TXT : 8430.090750 ms 7.572210% improvement > > CSV : 10115.135500 ms 8.991360% improvement > > TXT with 1/3 escapes: 9624.383500 ms 6.903970% improvement > > CSV with 1/3 quotes: 12331.714000 ms 8.002699% improvement > > Thank you for the results, they are interesting. I didn't expect to > see any regression for this benchmark. Also, I would expect the > non-special character cases and the 1/3 special character cases to > perform similarly, since we are not using SIMD for this benchmark. > > I noticed that the timings in your narrow benchmark (both x86 and ARM) > are quite short. Would it be possible to extend the test so that the > total runtime is closer to ~10,000 ms? That might give us more stable > results. > > Here is my benchmark with using your script: > > WIDE: Total 500000 lines and each line is 4096 bytes. > NARROW: Total 1500000 lines and each line is 2-4 bytes (`"A""A"` and > `A\\A`). > > > +---------+---------------+---------------+---------------+----------------+ > | WIDE | TXT None | TXT 1/3 | CSV None | CSV 1/3 > | > > +---------+---------------+---------------+---------------+----------------+ > | master | 10512 | 11133 | 12241 | 14321 > | > > +---------+---------------+---------------+---------------+----------------+ > | patched | 10000 (-%4.8) | 10804 (-%2.9) | 11571 (-%5.4) | 14008 (-%2.18) > | > > +---------+---------------+---------------+---------------+----------------+ > | | | | | > | > > +---------+---------------+---------------+---------------+----------------+ > | NARROW | | | | > | > > +---------+---------------+---------------+---------------+----------------+ > | master | 9702 | 9745 | 9784 | 10149 > | > > +---------+---------------+---------------+---------------+----------------+ > | patched | 9344 (-%3.6) | 9477 (-%2.7) | 9439 (-%3.5) | 9751 (-%3.9) > | > > +---------+---------------+---------------+---------------+----------------+ > > The results look promising to me. > > -- > Regards, > Nazir Bilal Yavuz > Microsoft >
