wesm commented on pull request #7532:
URL: https://github.com/apache/arrow/pull/7532#issuecomment-648875010
For interest, I benchmarked 0.17.1 versus master with these new benchmarks
(gcc-8 on i9-9960X, with SSE4.2):
```
benchmark baseline
contender change % counters
75 BM_ByteStreamSplitDecode_Float_Scalar/1024 3.290 GiB/sec
33.036 GiB/sec 904.213 {'iterations': 609088}
17 BM_ByteStreamSplitDecode_Float_Scalar/32768 3.326 GiB/sec
32.946 GiB/sec 890.483 {'iterations': 18993}
94 BM_ByteStreamSplitDecode_Float_Scalar/65536 3.331 GiB/sec
32.940 GiB/sec 889.020 {'iterations': 9562}
40 BM_ByteStreamSplitDecode_Float_Scalar/4096 3.325 GiB/sec
32.770 GiB/sec 885.487 {'iterations': 150968}
85 BM_ByteStreamSplitDecode_Double_Scalar/32768 2.372 GiB/sec
22.162 GiB/sec 834.465 {'iterations': 6821}
41 BM_ByteStreamSplitDecode_Double_Scalar/4096 2.373 GiB/sec
21.957 GiB/sec 825.240 {'iterations': 54606}
152 BM_ByteStreamSplitDecode_Double_Scalar/1024 2.382 GiB/sec
21.598 GiB/sec 806.793 {'iterations': 216005}
56 BM_ByteStreamSplitDecode_Double_Scalar/65536 2.360 GiB/sec
20.721 GiB/sec 778.165 {'iterations': 3404}
81 BM_PlainDecodingFloat/32768 35.302 GiB/sec
57.093 GiB/sec 61.726 {'iterations': 283126}
42 BM_PlainEncodingSpacedFloat/32768/10000 4.001 GiB/sec
5.803 GiB/sec 45.019 {'iterations': 22934, 'null_percent': 100.0}
45 BM_PlainDecodingFloat/4096 63.384 GiB/sec
88.650 GiB/sec 39.862 {'iterations': 2777408}
48 BM_PlainEncodingInt64/1024 27.515 GiB/sec
36.216 GiB/sec 31.622 {'iterations': 2591133}
117 BM_PlainDecodingSpacedBoolean/32768/100 595.658 MiB/sec
752.488 MiB/sec 26.329 {'iterations': 13123, 'null_percent': 1.0}
26 BM_PlainDecodingSpacedBoolean/32768/1000 434.416 MiB/sec
544.202 MiB/sec 25.272 {'iterations': 9539, 'null_percent': 10.0}
86 BM_PlainDecodingSpacedBoolean/32768/1 843.205 MiB/sec
1.013 GiB/sec 22.976 {'iterations': 18949, 'null_percent': 0.01}
120 BM_PlainDecodingInt64/32768 47.857 GiB/sec
57.500 GiB/sec 20.149 {'iterations': 100000}
109 BM_PlainEncodingInt64/32768 29.582 GiB/sec
35.480 GiB/sec 19.938 {'iterations': 79459}
104 BM_PlainDecodingFloat/65536 49.863 GiB/sec
59.278 GiB/sec 18.883 {'iterations': 142638}
129 BM_PlainEncodingDouble/32768 28.485 GiB/sec
33.853 GiB/sec 18.845 {'iterations': 76522}
128 BM_PlainDecodingDouble/32768 49.289 GiB/sec
58.411 GiB/sec 18.508 {'iterations': 143174}
53 BM_PlainEncodingSpacedFloat/32768/100 3.748 GiB/sec
4.364 GiB/sec 16.428 {'iterations': 21388, 'null_percent': 1.0}
115 BM_PlainDecodingDouble/4096 44.133 GiB/sec
51.155 GiB/sec 15.910 {'iterations': 1035922}
74 BM_PlainEncodingFloatNaN/65536 32.516 GiB/sec
37.217 GiB/sec 14.456 {'iterations': 86167}
63 BM_PlainEncodingSpacedFloat/32768/1 4.060 GiB/sec
4.625 GiB/sec 13.919 {'iterations': 22322, 'null_percent': 0.01}
12 BM_PlainDecodingSpacedBoolean/32768/5000 213.706 MiB/sec
242.841 MiB/sec 13.634 {'iterations': 4744, 'null_percent': 50.0}
65 BM_PlainDecodingDouble/65536 41.841 GiB/sec
47.024 GiB/sec 12.387 {'iterations': 61985}
136 BM_PlainEncodingSpacedFloat/32768/1000 2.393 GiB/sec
2.672 GiB/sec 11.664 {'iterations': 13868, 'null_percent': 10.0}
49 BM_PlainEncodingFloatNaN/32768 33.901 GiB/sec
37.708 GiB/sec 11.230 {'iterations': 161071}
88 BM_PlainEncodingDoubleNaN/32768 29.286 GiB/sec
32.545 GiB/sec 11.126 {'iterations': 76529}
5 BM_PlainEncodingDouble/65536 28.512 GiB/sec
31.538 GiB/sec 10.616 {'iterations': 38180}
102 BM_PlainEncodingInt64/65536 28.743 GiB/sec
31.651 GiB/sec 10.117 {'iterations': 38881}
70 BM_PlainEncodingDouble/4096 19.080 GiB/sec
20.830 GiB/sec 9.176 {'iterations': 426726}
127 BM_ArrowBinaryPlain/EncodeArrow/262144 808.941 MiB/sec
881.991 MiB/sec 9.030 {'iterations': 386}
20 BM_PlainEncodingFloat/65536 31.667 GiB/sec
34.475 GiB/sec 8.865 {'iterations': 84147}
96 BM_PlainEncodingInt64/4096 19.124 GiB/sec
20.568 GiB/sec 7.552 {'iterations': 432511}
124 BM_ArrowBinaryPlain/EncodeArrow/1048576 815.152 MiB/sec
875.332 MiB/sec 7.383 {'iterations': 94}
71 BM_PlainDecodingInt64/4096 46.164 GiB/sec
49.474 GiB/sec 7.170 {'iterations': 1044621}
2 BM_PlainEncodingDoubleNaN/4096 18.896 GiB/sec
20.249 GiB/sec 7.159 {'iterations': 425806}
60 BM_ByteStreamSplitEncode_Double_Sse2/4096 14.559 GiB/sec
15.556 GiB/sec 6.848 {'iterations': 338502}
55 BM_ArrowBinaryPlain/EncodeLowLevel/262144 815.310 MiB/sec
861.555 MiB/sec 5.672 {'iterations': 387}
34 BM_PlainEncodingFloat/32768 32.249 GiB/sec
33.932 GiB/sec 5.218 {'iterations': 163372}
47 BM_PlainEncodingDouble/1024 28.595 GiB/sec
30.042 GiB/sec 5.058 {'iterations': 2611964}
66 BM_PlainEncodingDoubleNaN/1024 28.496 GiB/sec
29.898 GiB/sec 4.917 {'iterations': 2624242}
69 BM_PlainEncodingFloatNaN/4096 15.088 GiB/sec
15.820 GiB/sec 4.850 {'iterations': 676390}
121 BM_ArrowBinaryPlain/EncodeLowLevel/1048576 779.991 MiB/sec
817.701 MiB/sec 4.835 {'iterations': 87}
114 BM_PlainEncodingFloat/4096 14.836 GiB/sec
15.438 GiB/sec 4.058 {'iterations': 674205}
61 BM_PlainDecodingSpacedBoolean/32768/10000 150.677 GiB/sec
155.373 GiB/sec 3.117 {'iterations': 3418159, 'null_percent': 100.0}
0 BM_PlainDecodingSpacedDouble/32768/1 11.004 GiB/sec
11.334 GiB/sec 3.001 {'iterations': 31488, 'null_percent': 0.01}
30 BM_PlainDecodingSpacedDouble/32768/100 7.466 GiB/sec
7.623 GiB/sec 2.101 {'iterations': 21557, 'null_percent': 1.0}
97 BM_PlainDecodingSpacedFloat/32768/1 6.297 GiB/sec
6.420 GiB/sec 1.955 {'iterations': 36091, 'null_percent': 0.01}
32 BM_PlainEncodingBoolean/1024 496.306 MiB/sec
504.892 MiB/sec 1.730 {'iterations': 357601}
21 BM_PlainDecodingSpacedDouble/32768/5000 1.981 GiB/sec
2.015 GiB/sec 1.697 {'iterations': 5653, 'null_percent': 50.0}
38 BM_PlainDecodingSpacedFloat/32768/100 4.046 GiB/sec
4.108 GiB/sec 1.538 {'iterations': 23279, 'null_percent': 1.0}
106 BM_PlainDecodingSpacedFloat/32768/5000 1.007 GiB/sec
1.020 GiB/sec 1.347 {'iterations': 5674, 'null_percent': 50.0}
142 BM_ByteStreamSplitEncode_Float_Sse2/1024 16.353 GiB/sec
16.535 GiB/sec 1.113 {'iterations': 3016110}
15 BM_DictDecodingInt64_literals/65536 4.231 GiB/sec
4.272 GiB/sec 0.978 {'iterations': 6101}
77 BM_PlainDecodingSpacedDouble/32768/1000 4.984 GiB/sec
5.020 GiB/sec 0.733 {'iterations': 14174, 'null_percent': 10.0}
118 BM_PlainEncodingBoolean/4096 541.272 MiB/sec
545.032 MiB/sec 0.695 {'iterations': 90598}
95 BM_ByteStreamSplitDecode_Float_Sse2/4096 32.581 GiB/sec
32.792 GiB/sec 0.650 {'iterations': 1504518}
147 BM_PlainEncodingBoolean/32768 592.288 MiB/sec
594.803 MiB/sec 0.425 {'iterations': 13278}
4 BM_ByteStreamSplitEncode_Double_Scalar/1024 4.134 GiB/sec
4.152 GiB/sec 0.422 {'iterations': 381151}
8 BM_ByteStreamSplitDecode_Double_Sse2/32768 22.017 GiB/sec
22.074 GiB/sec 0.259 {'iterations': 63008}
110 BM_ByteStreamSplitEncode_Float_Sse2/32768 16.538 GiB/sec
16.572 GiB/sec 0.202 {'iterations': 95360}
111 BM_ArrowBinaryDict/DecodeArrowNonNull_Dense/32768 311.959 MiB/sec
312.479 MiB/sec 0.167 {'iterations': 1173}
57 BM_ByteStreamSplitDecode_Float_Sse2/65536 33.137 GiB/sec
33.192 GiB/sec 0.166 {'iterations': 93660}
18 BM_ByteStreamSplitDecode_Float_Sse2/1024 33.251 GiB/sec
33.304 GiB/sec 0.162 {'iterations': 6039074}
146 BM_ByteStreamSplitEncode_Double_Scalar/4096 2.723 GiB/sec
2.728 GiB/sec 0.157 {'iterations': 62530}
98 BM_DictDecodingInt64_literals/1024 3.555 GiB/sec
3.560 GiB/sec 0.131 {'iterations': 328237}
153 BM_ByteStreamSplitEncode_Double_Sse2/1024 16.488 GiB/sec
16.504 GiB/sec 0.099 {'iterations': 1516551}
11 BM_ArrowBinaryDict/EncodeArrow/262144 184.015 MiB/sec
184.183 MiB/sec 0.091 {'iterations': 86}
16 BM_PlainEncodingBoolean/65536 594.679 MiB/sec
594.970 MiB/sec 0.049 {'iterations': 6578}
133 BM_DictDecodingInt64_literals/4096 4.323 GiB/sec
4.323 GiB/sec 0.006 {'iterations': 100465}
134 BM_ByteStreamSplitDecode_Double_Sse2/65536 20.632 GiB/sec
20.625 GiB/sec -0.035 {'iterations': 29386}
113 BM_ByteStreamSplitDecode_Float_Sse2/32768 33.129 GiB/sec
33.071 GiB/sec -0.176 {'iterations': 189491}
27 BM_ArrowBinaryDict/EncodeDictDirectInt8/1048576 343.348m items/sec
342.736m items/sec -0.178 {'iterations': 227}
141 BM_ByteStreamSplitDecode_Double_Sse2/1024 22.110 GiB/sec
22.069 GiB/sec -0.183 {'iterations': 2030775}
29 BM_ArrowBinaryDict/EncodeDictDirectInt16/1048576 339.497m items/sec
338.635m items/sec -0.254 {'iterations': 227}
132 BM_ArrowBinaryDict/DecodeArrow_Dense/4096 312.039 MiB/sec
311.094 MiB/sec -0.303 {'iterations': 9158}
130 BM_PlainEncodingSpacedFloat/32768/5000 1.046 GiB/sec
1.042 GiB/sec -0.374 {'iterations': 5978, 'null_percent': 50.0}
14 BM_ByteStreamSplitEncode_Float_Sse2/4096 16.544 GiB/sec
16.482 GiB/sec -0.376 {'iterations': 761597}
143 BM_ByteStreamSplitEncode_Float_Scalar/4096 24.383 GiB/sec
24.277 GiB/sec -0.433 {'iterations': 1116769}
1 BM_PlainDecodingSpacedFloat/32768/1000 2.616 GiB/sec
2.603 GiB/sec -0.523 {'iterations': 14797, 'null_percent': 10.0}
149 BM_PlainDecodingBoolean/32768 2.240 GiB/sec
2.228 GiB/sec -0.544 {'iterations': 51699}
52 BM_ByteStreamSplitEncode_Double_Scalar/65536 2.503 GiB/sec
2.490 GiB/sec -0.552 {'iterations': 3585}
54 BM_PlainDecodingSpacedFloat/32768/10000 78.389 GiB/sec
77.952 GiB/sec -0.557 {'iterations': 443932, 'null_percent': 100.0}
51 BM_PlainDecodingBoolean/4096 2.072 GiB/sec
2.060 GiB/sec -0.561 {'iterations': 383485}
23 BM_ByteStreamSplitDecode_Double_Sse2/4096 22.109 GiB/sec
21.966 GiB/sec -0.646 {'iterations': 502323}
59 BM_ArrowBinaryDict/EncodeArrow/1048576 134.722 MiB/sec
133.843 MiB/sec -0.653 {'iterations': 16}
6 BM_ByteStreamSplitEncode_Float_Sse2/65536 16.639 GiB/sec
16.528 GiB/sec -0.666 {'iterations': 47498}
73 BM_DictDecodingInt64_literals/32768 4.837 GiB/sec
4.802 GiB/sec -0.714 {'iterations': 13919}
87 BM_ArrowBinaryDict/DecodeArrowNonNull_Dense/4096 313.016 MiB/sec
310.746 MiB/sec -0.725 {'iterations': 9130}
13 BM_ByteStreamSplitEncode_Double_Scalar/32768 2.727 GiB/sec
2.705 GiB/sec -0.827 {'iterations': 7826}
36 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dense/65536 501.907 MiB/sec
497.463 MiB/sec -0.885 {'iterations': 942}
84 BM_ArrowBinaryDict/EncodeDictDirectInt32/1048576 332.370m items/sec
329.335m items/sec -0.913 {'iterations': 221}
144 BM_DictDecodingInt64_repeats/4096 21.548 GiB/sec
21.350 GiB/sec -0.918 {'iterations': 490771}
28 BM_ArrowBinaryDict/EncodeDictDirectInt64/1048576 318.465m items/sec
315.486m items/sec -0.936 {'iterations': 212}
107 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dense/4096 530.019 MiB/sec
524.994 MiB/sec -0.948 {'iterations': 15425}
31 BM_ArrowBinaryDict/DecodeArrowNonNull_Dict/4096 211.935 MiB/sec
209.921 MiB/sec -0.950 {'iterations': 6222}
138 BM_ArrowBinaryDict/DecodeArrow_Dense/65536 312.669 MiB/sec
309.593 MiB/sec -0.984 {'iterations': 576}
126 BM_ArrowBinaryPlain/DecodeArrow_Dense/65536 504.087 MiB/sec
499.087 MiB/sec -0.992 {'iterations': 943}
22 BM_ArrowBinaryDict/DecodeArrowNonNull_Dense/1024 312.369 MiB/sec
309.219 MiB/sec -1.008 {'iterations': 34876}
62 BM_ByteStreamSplitEncode_Double_Sse2/65536 15.061 GiB/sec
14.885 GiB/sec -1.167 {'iterations': 21525}
122 BM_DictDecodingInt64_repeats/1024 9.678 GiB/sec
9.559 GiB/sec -1.231 {'iterations': 879281}
101 BM_ArrowBinaryDict/DecodeArrow_Dict/4096 213.222 MiB/sec
210.438 MiB/sec -1.306 {'iterations': 6214}
79 BM_PlainEncodingDoubleNaN/65536 32.893 GiB/sec
32.462 GiB/sec -1.312 {'iterations': 39953}
93 BM_PlainDecodingBoolean/65536 2.258 GiB/sec
2.225 GiB/sec -1.435 {'iterations': 26019}
35 BM_ArrowBinaryDict/DecodeArrow_Dense/32768 313.962 MiB/sec
309.360 MiB/sec -1.466 {'iterations': 1164}
90 BM_ArrowBinaryDict/DecodeArrow_Dense/1024 312.700 MiB/sec
308.068 MiB/sec -1.481 {'iterations': 35306}
100 BM_ByteStreamSplitEncode_Double_Sse2/32768 15.788 GiB/sec
15.551 GiB/sec -1.501 {'iterations': 45332}
139 BM_ArrowBinaryDict/DecodeArrowNonNull_Dense/65536 312.836 MiB/sec
308.139 MiB/sec -1.501 {'iterations': 579}
68 BM_PlainEncodingFloatNaN/1024 19.321 GiB/sec
19.026 GiB/sec -1.525 {'iterations': 3558038}
39 BM_DictDecodingInt64_repeats/65536 48.466 GiB/sec
47.718 GiB/sec -1.543 {'iterations': 70313}
150 BM_ArrowBinaryPlain/DecodeArrow_Dict/4096 202.368 MiB/sec
199.097 MiB/sec -1.617 {'iterations': 5919}
67 BM_ArrowBinaryPlain/DecodeArrow_Dense/4096 531.948 MiB/sec
523.009 MiB/sec -1.680 {'iterations': 15476}
82 BM_ByteStreamSplitEncode_Float_Scalar/1024 24.310 GiB/sec
23.875 GiB/sec -1.790 {'iterations': 4461695}
76 BM_PlainDecodingInt64/1024 70.221 GiB/sec
68.947 GiB/sec -1.814 {'iterations': 6594895}
25 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dense/32768 504.202 MiB/sec
494.938 MiB/sec -1.837 {'iterations': 1891}
151 BM_ArrowBinaryPlain/DecodeArrow_Dense/32768 506.462 MiB/sec
496.392 MiB/sec -1.988 {'iterations': 1870}
91 BM_ArrowBinaryDict/DecodeArrow_Dict/1024 234.779 MiB/sec
229.944 MiB/sec -2.060 {'iterations': 26404}
112 BM_ArrowBinaryDict/DecodeArrowNonNull_Dict/1024 234.447 MiB/sec
229.476 MiB/sec -2.120 {'iterations': 26220}
108 BM_PlainDecodingBoolean/1024 1.725 GiB/sec
1.688 GiB/sec -2.186 {'iterations': 1267309}
103 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dense/1024 605.637 MiB/sec
592.153 MiB/sec -2.226 {'iterations': 68125}
105 BM_DictDecodingInt64_repeats/32768 45.450 GiB/sec
44.321 GiB/sec -2.484 {'iterations': 130387}
131 BM_PlainEncodingSpacedBoolean/32768/5000 231.256 MiB/sec
225.230 MiB/sec -2.606 {'iterations': 5186, 'null_percent': 50.0}
137 BM_ArrowBinaryDict/DecodeArrowNonNull_Dict/65536 169.823 MiB/sec
165.178 MiB/sec -2.735 {'iterations': 322}
37 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dict/4096 204.655 MiB/sec
199.018 MiB/sec -2.754 {'iterations': 6017}
3 BM_ArrowBinaryPlain/DecodeArrow_Dict/1024 221.210 MiB/sec
214.416 MiB/sec -3.071 {'iterations': 25133}
135 BM_PlainDecodingFloat/1024 38.433 GiB/sec
37.209 GiB/sec -3.184 {'iterations': 7103583}
33 BM_ArrowBinaryDict/EncodeLowLevel/1048576 77.680 MiB/sec
75.029 MiB/sec -3.413 {'iterations': 7}
44 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dict/1024 222.182 MiB/sec
214.466 MiB/sec -3.473 {'iterations': 25260}
78 BM_ArrowBinaryDict/DecodeArrowNonNull_Dict/32768 178.416 MiB/sec
172.074 MiB/sec -3.555 {'iterations': 666}
9 BM_ArrowBinaryDict/DecodeArrow_Dict/32768 178.665 MiB/sec
171.921 MiB/sec -3.775 {'iterations': 667}
24 BM_PlainEncodingFloat/1024 19.529 GiB/sec
18.754 GiB/sec -3.969 {'iterations': 3604087}
64 BM_ArrowBinaryDict/DecodeArrow_Dict/65536 171.225 MiB/sec
164.030 MiB/sec -4.202 {'iterations': 320}
46 BM_ArrowBinaryPlain/DecodeArrow_Dense/1024 606.983 MiB/sec
581.332 MiB/sec -4.226 {'iterations': 67758}
125 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dict/32768 182.689 MiB/sec
174.484 MiB/sec -4.491 {'iterations': 683}
145 BM_ArrowBinaryPlain/DecodeArrow_Dict/65536 177.063 MiB/sec
168.812 MiB/sec -4.660 {'iterations': 331}
43 BM_ArrowBinaryPlain/DecodeArrow_Dict/32768 183.423 MiB/sec
174.771 MiB/sec -4.717 {'iterations': 686}
99 BM_ArrowBinaryPlain/DecodeArrowNonNull_Dict/65536 177.668 MiB/sec
168.391 MiB/sec -5.221 {'iterations': 329}
7 BM_PlainDecodingInt64/65536 41.873 GiB/sec
39.644 GiB/sec -5.325 {'iterations': 49806}
123 BM_ByteStreamSplitEncode_Float_Scalar/65536 21.111 GiB/sec
19.875 GiB/sec -5.855 {'iterations': 60883}
10 BM_ArrowBinaryDict/EncodeLowLevel/262144 87.598 MiB/sec
82.123 MiB/sec -6.250 {'iterations': 37}
140 BM_PlainEncodingSpacedBoolean/32768/1000 393.921 MiB/sec
364.481 MiB/sec -7.474 {'iterations': 8900, 'null_percent': 10.0}
89 BM_ByteStreamSplitEncode_Float_Scalar/32768 21.221 GiB/sec
19.595 GiB/sec -7.660 {'iterations': 116928}
92 BM_PlainEncodingSpacedBoolean/32768/100 501.207 MiB/sec
441.384 MiB/sec -11.936 {'iterations': 11331, 'null_percent': 1.0}
58 BM_PlainEncodingSpacedBoolean/32768/1 515.493 MiB/sec
453.182 MiB/sec -12.088 {'iterations': 11613, 'null_percent': 0.01}
19 BM_PlainEncodingSpacedBoolean/32768/10000 1.164 GiB/sec
1.006 GiB/sec -13.607 {'iterations': 26927, 'null_percent': 100.0}
148 BM_PlainEncodingSpacedDouble/32768/1000 4.735 GiB/sec
4.081 GiB/sec -13.804 {'iterations': 13620, 'null_percent': 10.0}
72 BM_PlainEncodingSpacedDouble/32768/5000 2.057 GiB/sec
1.749 GiB/sec -14.956 {'iterations': 5886, 'null_percent': 50.0}
119 BM_PlainDecodingDouble/1024 60.144 GiB/sec
50.952 GiB/sec -15.284 {'iterations': 5528526}
50 BM_PlainDecodingSpacedDouble/32768/10000 78.068 GiB/sec
62.263 GiB/sec -20.246 {'iterations': 216445, 'null_percent': 100.0}
80 BM_PlainEncodingSpacedDouble/32768/100 7.638 GiB/sec
5.668 GiB/sec -25.799 {'iterations': 21640, 'null_percent': 1.0}
116 BM_PlainEncodingSpacedDouble/32768/10000 10.204 GiB/sec
7.431 GiB/sec -27.180 {'iterations': 29377, 'null_percent': 100.0}
83 BM_PlainEncodingSpacedDouble/32768/1 8.239 GiB/sec
5.922 GiB/sec -28.121 {'iterations': 23695, 'null_percent': 0.01}
```
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