jhorstmann opened a new pull request #8370:
URL: https://github.com/apache/arrow/pull/8370
Built on top of [ARROW-10040][1] (#8262)
Benchmarks (run on a Ryzen 3700U laptop with some thermal problems)
Current master without simd:
```
$ cargo bench --bench aggregate_kernels
sum 512 time: [3.9652 us 3.9722 us 3.9819 us]
change: [-0.2270% -0.0896% +0.0672%] (p = 0.23 >
0.05)
No change in performance detected.
Found 14 outliers among 100 measurements (14.00%)
4 (4.00%) high mild
10 (10.00%) high severe
sum nulls 512 time: [9.4577 us 9.4796 us 9.5112 us]
change: [+2.9175% +3.1309% +3.3937%] (p = 0.00 <
0.05)
Performance has regressed.
Found 4 outliers among 100 measurements (4.00%)
1 (1.00%) high mild
3 (3.00%) high severe
```
This branch without simd (speedup probably due to accessing the data via a
slice):
```
sum 512 time: [1.1066 us 1.1113 us 1.1168 us]
change: [-72.648% -72.480% -72.310%] (p = 0.00 <
0.05)
Performance has improved.
Found 13 outliers among 100 measurements (13.00%)
7 (7.00%) high mild
6 (6.00%) high severe
sum nulls 512 time: [1.3279 us 1.3364 us 1.3469 us]
change: [-86.326% -86.209% -86.085%] (p = 0.00 <
0.05)
Performance has improved.
Found 20 outliers among 100 measurements (20.00%)
4 (4.00%) high mild
16 (16.00%) high severe
```
This branch with simd:
```
sum 512 time: [108.58 ns 109.47 ns 110.57 ns]
change: [-90.164% -90.033% -89.850%] (p = 0.00 <
0.05)
Performance has improved.
Found 11 outliers among 100 measurements (11.00%)
1 (1.00%) high mild
10 (10.00%) high severe
sum nulls 512 time: [249.95 ns 250.50 ns 251.06 ns]
change: [-81.420% -81.281% -81.157%] (p = 0.00 <
0.05)
Performance has improved.
Found 4 outliers among 100 measurements (4.00%)
3 (3.00%) high mild
1 (1.00%) high severe
```
[1]: https://issues.apache.org/jira/browse/ARROW-10040
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