wesm commented on pull request #7525:
URL: https://github.com/apache/arrow/pull/7525#issuecomment-648410615
I looked at the Parquet read/write benchmarks, the differences look like
mostly noise to me
```
benchmark baseline contender
change % counters
40 BM_ReadColumn<true,BooleanType>/-1/1 754.859 MiB/sec 857.980 MiB/sec
13.661 {'iterations': 18}
17 BM_ReadColumn<true,DoubleType>/25/25 1.165 GiB/sec 1.228 GiB/sec
5.379 {'iterations': 7}
37 BM_ReadColumn<true,BooleanType>/5/10 461.996 MiB/sec 485.049 MiB/sec
4.990 {'iterations': 11}
8 BM_ReadColumn<true,Int32Type>/25/5 749.004 MiB/sec 785.493 MiB/sec
4.872 {'iterations': 8}
33 BM_ReadColumn<true,Int32Type>/-1/0 1.537 GiB/sec 1.609 GiB/sec
4.694 {'iterations': 18}
27 BM_ReadColumn<true,Int64Type>/-1/0 2.398 GiB/sec 2.492 GiB/sec
3.913 {'iterations': 17}
36 BM_ReadColumn<false,BooleanType>/1/20 396.502 MiB/sec 409.002 MiB/sec
3.153 {'iterations': 28}
28 BM_ReadMultipleRowGroups 4.873 GiB/sec 4.988 GiB/sec
2.357 {'iterations': 35}
44 BM_ReadIndividualRowGroups 4.907 GiB/sec 5.018 GiB/sec
2.259 {'iterations': 35}
0 BM_ReadColumn<false,BooleanType>/-1/0 1.003 GiB/sec 1.023 GiB/sec
2.039 {'iterations': 72}
12 BM_ReadColumn<true,Int32Type>/50/0 608.159 MiB/sec 618.035 MiB/sec
1.624 {'iterations': 7}
35 BM_ReadColumn<false,Int32Type>/-1/50 3.050 GiB/sec 3.089 GiB/sec
1.260 {'iterations': 51}
43 BM_ReadColumn<true,Int64Type>/10/5 1.448 GiB/sec 1.464 GiB/sec
1.062 {'iterations': 9}
2 BM_ReadColumn<true,Int32Type>/10/10 946.909 MiB/sec 954.967 MiB/sec
0.851 {'iterations': 9}
38 BM_ReadColumn<true,Int64Type>/99/50 2.082 GiB/sec 2.097 GiB/sec
0.731 {'iterations': 11}
1 BM_ReadColumn<false,Int64Type>/-1/1 9.340 GiB/sec 9.396 GiB/sec
0.607 {'iterations': 79}
15 BM_ReadColumn<false,Int32Type>/-1/1 5.533 GiB/sec 5.564 GiB/sec
0.559 {'iterations': 101}
32 BM_WriteColumn<true,BooleanType> 323.257 MiB/sec 324.536 MiB/sec
0.396 {'iterations': 7}
7 BM_WriteColumn<true,Int32Type> 575.266 MiB/sec 575.742 MiB/sec
0.083 {'iterations': 6}
16 BM_ReadColumn<false,Int32Type>/-1/10 1.608 GiB/sec 1.609 GiB/sec
0.074 {'iterations': 29}
13 BM_ReadColumn<true,Int32Type>/50/50 607.396 MiB/sec 607.840 MiB/sec
0.073 {'iterations': 6}
34 BM_ReadColumn<true,DoubleType>/-1/0 2.485 GiB/sec 2.486 GiB/sec
0.050 {'iterations': 13}
39 BM_ReadColumn<false,Int64Type>/-1/50 5.035 GiB/sec 5.033 GiB/sec
-0.053 {'iterations': 47}
9 BM_ReadColumn<true,Int64Type>/50/50 960.235 MiB/sec 957.587 MiB/sec
-0.276 {'iterations': 6}
21 BM_ReadColumn<true,Int64Type>/1/1 2.445 GiB/sec 2.437 GiB/sec
-0.342 {'iterations': 17}
42 BM_ReadColumn<true,Int64Type>/35/10 1.083 GiB/sec 1.078 GiB/sec
-0.508 {'iterations': 6}
45 BM_ReadColumn<true,DoubleType>/10/50 1.441 GiB/sec 1.432 GiB/sec
-0.591 {'iterations': 10}
31 BM_ReadColumn<false,Int64Type>/-1/10 3.050 GiB/sec 3.031 GiB/sec
-0.626 {'iterations': 26}
26 BM_ReadColumn<true,Int64Type>/99/0 2.080 GiB/sec 2.067 GiB/sec
-0.630 {'iterations': 11}
29 BM_ReadColumn<true,Int32Type>/99/50 1.345 GiB/sec 1.333 GiB/sec
-0.845 {'iterations': 13}
5 BM_ReadColumn<true,Int32Type>/99/0 1.369 GiB/sec 1.357 GiB/sec
-0.875 {'iterations': 13}
14 BM_ReadColumn<true,Int64Type>/45/25 966.350 MiB/sec 957.826 MiB/sec
-0.882 {'iterations': 6}
18 BM_WriteColumn<false,BooleanType> 318.849 MiB/sec 315.743 MiB/sec
-0.974 {'iterations': 22}
3 BM_ReadColumn<false,DoubleType>/-1/20 4.140 GiB/sec 4.098 GiB/sec
-1.013 {'iterations': 34}
25 BM_ReadColumn<true,Int32Type>/1/1 1.610 GiB/sec 1.593 GiB/sec
-1.049 {'iterations': 19}
4 BM_ReadColumn<true,Int64Type>/50/1 961.641 MiB/sec 949.897 MiB/sec
-1.221 {'iterations': 6}
10 BM_ReadColumn<true,Int64Type>/5/5 1.751 GiB/sec 1.729 GiB/sec
-1.259 {'iterations': 10}
19 BM_WriteColumn<false,DoubleType> 1.087 GiB/sec 1.072 GiB/sec
-1.355 {'iterations': 10}
24 BM_ReadColumn<true,Int64Type>/30/10 1.137 GiB/sec 1.120 GiB/sec
-1.502 {'iterations': 7}
22 BM_WriteColumn<false,Int32Type> 769.037 MiB/sec 757.229 MiB/sec
-1.536 {'iterations': 11}
41 BM_ReadColumn<true,Int64Type>/25/10 1.207 GiB/sec 1.187 GiB/sec
-1.611 {'iterations': 9}
20 BM_WriteColumn<true,Int64Type> 995.675 MiB/sec 967.346 MiB/sec
-2.845 {'iterations': 6}
11 BM_ReadColumn<true,Int64Type>/75/1 1.178 GiB/sec 1.143 GiB/sec
-2.953 {'iterations': 8}
30 BM_WriteColumn<true,DoubleType> 967.789 MiB/sec 915.061 MiB/sec
-5.448 {'iterations': 6}
6 BM_ReadColumn<false,DoubleType>/-1/0 14.679 GiB/sec 13.820 GiB/sec
-5.851 {'iterations': 100}
23 BM_WriteColumn<false,Int64Type> 1.427 GiB/sec 1.296 GiB/sec
-9.217 {'iterations': 13}
```
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