cyb70289 commented on pull request #8091:
URL: https://github.com/apache/arrow/pull/8091#issuecomment-685348952
Latest benchmark result after re-implementation.
```
# Tested on skylake (knight landing)
$ archery benchmark diff --suite-filter="arrow-compute-aggregate-benchmark"
--benchmark-filter="^Mode" --cc=clang-9 --cxx=clang++-9
benchmark baseline contender change %
// igonre these 100% cases, huge boost due to a simple trick, not very useful
ModeKernelBoolean/1048576/1 123.216 MiB/sec 847.125 GiB/sec
703915.356 null_percent': 100.0
ModeKernelInt8/1048576/1 896.330 MiB/sec 617.997 GiB/sec
70502.192 null_percent': 100.0
ModeKernelInt16/1048576/1 2.886 GiB/sec 965.237 GiB/sec
33340.541 null_percent': 100.0
ModeKernelInt32/1048576/1 5.732 GiB/sec 960.476 GiB/sec
16657.027 null_percent': 100.0
ModeKernelInt64/1048576/1 7.925 GiB/sec 974.705 GiB/sec
12198.487 null_percent': 100.0
// big improvement for int16/32/64 with limited value range
ModeKernelInt16/1048576/0 128.522 MiB/sec 495.771 MiB/sec
285.749 'null_percent': 0.0
ModeKernelInt32/1048576/0 257.694 MiB/sec 953.232 MiB/sec
269.909 'null_percent': 0.0
ModeKernelInt64/1048576/0 516.624 MiB/sec 1.715 GiB/sec
240.027 'null_percent': 0.0
ModeKernelInt32/1048576/10000 227.404 MiB/sec 690.032 MiB/sec
203.439 'null_percent': 0.01
ModeKernelInt16/1048576/10000 115.419 MiB/sec 349.055 MiB/sec
202.425 'null_percent': 0.01
ModeKernelInt32/1048576/100 229.661 MiB/sec 684.149 MiB/sec
197.895 'null_percent': 1.0
ModeKernelInt16/1048576/100 116.084 MiB/sec 342.620 MiB/sec
195.148 'null_percent': 1.0
ModeKernelInt64/1048576/10000 481.409 MiB/sec 1.302 GiB/sec
176.913 'null_percent': 0.01
ModeKernelInt64/1048576/100 486.266 MiB/sec 1.297 GiB/sec
173.114 'null_percent': 1.0
ModeKernelInt16/1048576/10 121.865 MiB/sec 315.932 MiB/sec
159.247 'null_percent': 10.0
ModeKernelInt32/1048576/10 242.074 MiB/sec 625.162 MiB/sec
158.252 'null_percent': 10.0
ModeKernelInt64/1048576/10 527.976 MiB/sec 1.199 GiB/sec
132.580 'null_percent': 10.0
ModeKernelInt32/1048576/2 320.156 MiB/sec 429.196 MiB/sec
34.058 'null_percent': 50.0
ModeKernelInt16/1048576/2 162.121 MiB/sec 196.310 MiB/sec
21.089 'null_percent': 50.0
// no obvious difference for bool/int8
ModeKernelInt8/1048576/100 234.422 MiB/sec 251.464 MiB/sec
7.270 'null_percent': 1.0
ModeKernelInt8/1048576/10 246.324 MiB/sec 258.110 MiB/sec
4.785 'null_percent': 10.0
ModeKernelInt8/1048576/10000 239.496 MiB/sec 250.469 MiB/sec
4.582 'null_percent': 0.01
ModeKernelInt64/1048576/2 812.020 MiB/sec 832.610 MiB/sec
2.536 'null_percent': 50.0
ModeKernelBoolean/1048576/10000 26.318 MiB/sec 26.509 MiB/sec
0.728 'null_percent': 0.01
ModeKernelBoolean/1048576/100 26.510 MiB/sec 26.597 MiB/sec
0.327 'null_percent': 1.0
ModeKernelBoolean/1048576/0 28.271 MiB/sec 28.274 MiB/sec
0.009 'null_percent': 0.0
ModeKernelInt8/1048576/0 270.401 MiB/sec 269.025 MiB/sec
-0.509 'null_percent': 0.0
ModeKernelInt8/1048576/2 190.410 MiB/sec 187.876 MiB/sec
-1.331 'null_percent': 50.0
ModeKernelBoolean/1048576/10 28.007 MiB/sec 27.599 MiB/sec
-1.455 'null_percent': 10.0
ModeKernelBoolean/1048576/2 27.157 MiB/sec 24.209 MiB/sec
-10.857 'null_percent': 50.0
```
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