neilconway commented on PR #20278:
URL: https://github.com/apache/datafusion/pull/20278#issuecomment-3880334132
Benchmark results:
```
Running benches/pad.rs (target/release/deps/pad-b74c12aa445bf68e)
Gnuplot not found, using plotters backend
lpad size=1024/lpad utf8 [size=1024, str_len=5, target=20]
time: [13.059 µs 13.073 µs 13.086 µs]
change: [−75.614% −75.346% −75.137%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) low mild
lpad size=1024/lpad stringview [size=1024, str_len=5, target=20]
time: [11.552 µs 11.560 µs 11.569 µs]
change: [−78.830% −78.528% −78.298%] (p = 0.00 <
0.05)
Performance has improved.
lpad size=1024/lpad utf8 [size=1024, str_len=20, target=50]
time: [11.373 µs 11.420 µs 11.458 µs]
change: [−93.139% −92.998% −92.888%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) low mild
lpad size=1024/lpad stringview [size=1024, str_len=20, target=50]
time: [11.857 µs 11.871 µs 11.887 µs]
change: [−92.972% −92.825% −92.700%] (p = 0.00 <
0.05)
Performance has improved.
lpad size=1024/lpad utf8 unicode [size=1024, target=20]
time: [92.289 µs 93.798 µs 95.872 µs]
change: [−4.0607% −2.2791% −0.0744%] (p = 0.05 <
0.05)
Change within noise threshold.
Found 2 outliers among 10 measurements (20.00%)
1 (10.00%) high mild
1 (10.00%) high severe
lpad size=1024/lpad stringview unicode [size=1024, target=20]
time: [95.919 µs 96.579 µs 97.458 µs]
change: [+3.0933% +4.1235% +5.2351%] (p = 0.00 <
0.05)
Performance has regressed.
Found 2 outliers among 10 measurements (20.00%)
1 (10.00%) high mild
1 (10.00%) high severe
lpad size=4096/lpad utf8 [size=4096, str_len=5, target=20]
time: [55.219 µs 55.744 µs 56.437 µs]
change: [−74.845% −74.463% −74.067%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high mild
lpad size=4096/lpad stringview [size=4096, str_len=5, target=20]
time: [47.605 µs 47.737 µs 47.887 µs]
change: [−78.282% −78.097% −77.945%] (p = 0.00 <
0.05)
Performance has improved.
lpad size=4096/lpad utf8 [size=4096, str_len=20, target=50]
time: [46.430 µs 47.324 µs 48.286 µs]
change: [−93.049% −92.852% −92.662%] (p = 0.00 <
0.05)
Performance has improved.
lpad size=4096/lpad stringview [size=4096, str_len=20, target=50]
time: [47.352 µs 48.110 µs 49.133 µs]
change: [−92.810% −92.629% −92.423%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high mild
lpad size=4096/lpad utf8 unicode [size=4096, target=20]
time: [376.29 µs 378.75 µs 381.86 µs]
change: [+1.7985% +2.5712% +3.4954%] (p = 0.00 <
0.05)
Performance has regressed.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high mild
lpad size=4096/lpad stringview unicode [size=4096, target=20]
time: [380.75 µs 383.62 µs 387.43 µs]
change: [−1.2725% −0.2318% +0.8972%] (p = 0.70 >
0.05)
No change in performance detected.
Found 2 outliers among 10 measurements (20.00%)
2 (20.00%) high severe
rpad size=1024/rpad utf8 [size=1024, str_len=5, target=20]
time: [13.597 µs 13.665 µs 13.748 µs]
change: [−77.429% −77.259% −77.102%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high mild
rpad size=1024/rpad stringview [size=1024, str_len=5, target=20]
time: [13.854 µs 13.908 µs 13.970 µs]
change: [−76.702% −76.483% −76.293%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 10 measurements (20.00%)
2 (20.00%) high mild
rpad size=1024/rpad utf8 [size=1024, str_len=20, target=50]
time: [12.804 µs 12.850 µs 12.903 µs]
change: [−92.564% −92.437% −92.325%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high mild
rpad size=1024/rpad stringview [size=1024, str_len=20, target=50]
time: [13.173 µs 13.204 µs 13.238 µs]
change: [−92.356% −92.207% −92.115%] (p = 0.00 <
0.05)
Performance has improved.
rpad size=1024/rpad utf8 unicode [size=1024, target=20]
time: [98.236 µs 98.714 µs 99.357 µs]
change: [+2.2886% +3.1339% +3.9890%] (p = 0.00 <
0.05)
Performance has regressed.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high severe
rpad size=1024/rpad stringview unicode [size=1024, target=20]
time: [97.562 µs 103.38 µs 113.92 µs]
change: [−0.4527% +5.6605% +16.577%] (p = 0.30 >
0.05)
No change in performance detected.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high severe
rpad size=4096/rpad utf8 [size=4096, str_len=5, target=20]
time: [57.742 µs 58.722 µs 59.893 µs]
change: [−76.131% −75.713% −75.202%] (p = 0.00 <
0.05)
Performance has improved.
Found 2 outliers among 10 measurements (20.00%)
2 (20.00%) high mild
rpad size=4096/rpad stringview [size=4096, str_len=5, target=20]
time: [57.256 µs 58.176 µs 59.196 µs]
change: [−75.652% −75.151% −74.661%] (p = 0.00 <
0.05)
Performance has improved.
rpad size=4096/rpad utf8 [size=4096, str_len=20, target=50]
time: [52.659 µs 55.964 µs 61.240 µs]
change: [−92.224% −91.701% −90.893%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high severe
rpad size=4096/rpad stringview [size=4096, str_len=20, target=50]
time: [50.029 µs 50.950 µs 51.995 µs]
change: [−92.638% −92.455% −92.266%] (p = 0.00 <
0.05)
Performance has improved.
rpad size=4096/rpad utf8 unicode [size=4096, target=20]
time: [368.78 µs 370.27 µs 371.98 µs]
change: [−6.9765% −5.8825% −4.9873%] (p = 0.00 <
0.05)
Performance has improved.
rpad size=4096/rpad stringview unicode [size=4096, target=20]
time: [372.78 µs 374.26 µs 376.59 µs]
change: [−6.8942% −6.1219% −5.3899%] (p = 0.00 <
0.05)
Performance has improved.
Found 1 outliers among 10 measurements (10.00%)
1 (10.00%) high severe
```
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