mapleFU commented on PR #8694:
URL: https://github.com/apache/arrow-rs/pull/8694#issuecomment-3474198190
@alamb I've ran the new code on MacOS M4 Pro. Don't know whether the
performance comes from unstable environment or other
<details>
This patch:
```
view types slice time: [112.32 ns 112.44 ns 112.56 ns]
Found 3 outliers among 100 measurements (3.00%)
2 (2.00%) low severe
1 (1.00%) low mild
gc view types all[100000]
time: [246.89 µs 249.22 µs 251.63 µs]
Found 8 outliers among 100 measurements (8.00%)
4 (4.00%) low mild
4 (4.00%) high mild
gc view types slice half[100000]
time: [79.469 µs 81.771 µs 84.060 µs]
Found 1 outliers among 100 measurements (1.00%)
1 (1.00%) high mild
gc view types all without nulls[100000]
time: [406.50 µs 411.58 µs 417.23 µs]
Found 14 outliers among 100 measurements (14.00%)
9 (9.00%) high mild
5 (5.00%) high severe
gc view types slice half without nulls[100000]
time: [373.40 µs 379.37 µs 385.93 µs]
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) high mild
1 (1.00%) high severe
gc view types all[8000] time: [11.603 µs 11.663 µs 11.729 µs]
Found 3 outliers among 100 measurements (3.00%)
3 (3.00%) high mild
gc view types slice half[8000]
time: [9.4269 µs 10.204 µs 11.012 µs]
Found 15 outliers among 100 measurements (15.00%)
13 (13.00%) low severe
2 (2.00%) low mild
gc view types all without nulls[8000]
time: [27.001 µs 27.155 µs 27.368 µs]
Found 9 outliers among 100 measurements (9.00%)
5 (5.00%) high mild
4 (4.00%) high severe
gc view types slice half without nulls[8000]
time: [13.570 µs 13.594 µs 13.621 µs]
Found 4 outliers among 100 measurements (4.00%)
1 (1.00%) low severe
2 (2.00%) high mild
1 (1.00%) high severe
```
main:
```
view types slice time: [118.73 ns 121.33 ns 124.80 ns]
change: [+16.208% +20.497% +25.223%] (p = 0.00 <
0.05)
Performance has regressed.
Found 2 outliers among 100 measurements (2.00%)
2 (2.00%) high mild
gc view types all[100000]
time: [175.56 µs 177.37 µs 179.60 µs]
change: [-26.662% -25.460% -24.243%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) high mild
1 (1.00%) high severe
gc view types slice half[100000]
time: [76.242 µs 76.520 µs 76.843 µs]
change: [-2.6612% -0.4692% +1.8536%] (p = 0.69 >
0.05)
No change in performance detected.
Found 10 outliers among 100 measurements (10.00%)
3 (3.00%) high mild
7 (7.00%) high severe
gc view types all without nulls[100000]
time: [385.38 µs 393.14 µs 401.00 µs]
change: [-3.7465% -2.3347% -0.8310%] (p = 0.00 <
0.05)
Change within noise threshold.
Found 12 outliers among 100 measurements (12.00%)
5 (5.00%) low mild
4 (4.00%) high mild
3 (3.00%) high severe
gc view types slice half without nulls[100000]
time: [422.70 µs 426.62 µs 430.63 µs]
change: [+2.9492% +5.2722% +7.6808%] (p = 0.00 <
0.05)
Performance has regressed.
Found 6 outliers among 100 measurements (6.00%)
1 (1.00%) low mild
4 (4.00%) high mild
1 (1.00%) high severe
gc view types all[8000] time: [16.079 µs 17.457 µs 18.815 µs]
change: [+47.350% +57.679% +66.216%] (p = 0.00 <
0.05)
Performance has regressed.
gc view types slice half[8000]
time: [14.127 µs 15.144 µs 16.037 µs]
change: [+26.202% +34.352% +42.179%] (p = 0.00 <
0.05)
Performance has regressed.
Found 9 outliers among 100 measurements (9.00%)
9 (9.00%) low mild
gc view types all without nulls[8000]
time: [27.309 µs 28.280 µs 29.285 µs]
change: [-2.8581% -1.0174% +0.8766%] (p = 0.29 >
0.05)
No change in performance detected.
Found 15 outliers among 100 measurements (15.00%)
1 (1.00%) low mild
3 (3.00%) high mild
11 (11.00%) high severe
gc view types slice half without nulls[8000]
time: [15.009 µs 15.857 µs 16.825 µs]
```
</details>
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