Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/3643#issuecomment-68464357
I ran some quick tests with random sparsity patterns. Averaged over 1000
iterations, it's definitely faster:
length | v1 sparsity | v2 sparsity | new
time | old time | speedup
--------- | --------- | ----------- |
----------- | ----------- | -----------
1000 | 1 | 0.5 | 9.42E-06 |
6.73E-04 | 71.44
1000 | 1 | 0.1 | 1.69E-06 |
5.50E-05 | 32.43
1000 | 1 | 0.01 | 1.90E-06 |
3.30E-05 | 17.40
1000 | 0.5 | 0.1 | 9.89E-06 |
7.17E-05 | 7.25
1000 | 0.5 | 0.01 | 2.54E-06 |
5.80E-05 | 22.80
1000 | 0.1 | 0.01 | 1.95E-06 |
5.82E-05 | 29.84
10000 | 1 | 0.5 | 1.11E-05 |
2.30E-04 | 20.73
10000 | 1 | 0.1 | 1.03E-05 |
2.54E-04 | 24.54
10000 | 1 | 0.01 | 8.69E-06 |
3.90E-04 | 44.92
10000 | 0.5 | 0.1 | 1.47E-05 |
3.90E-04 | 26.63
10000 | 0.5 | 0.01 | 8.63E-06 |
4.03E-04 | 46.76
10000 | 0.1 | 0.01 | 1.81E-06 |
5.96E-04 | 329.01
100000 | 1 | 0.5 | 9.27E-05 |
0.004039351 | 43.60
100000 | 1 | 0.1 | 9.06E-05 |
0.001540544 | 17.01
100000 | 1 | 0.01 | 8.71E-05 |
0.002636216 | 30.25
100000 | 0.5 | 0.1 | 1.15E-04 |
0.003777669 | 32.76
100000 | 0.5 | 0.01 | 9.61E-05 |
0.004879063 | 50.79
100000 | 0.1 | 0.01 | 1.89E-05 |
0.003148419 | 166.29
1000000 | 1 | 0.5 | 0.001017196 |
0.05418411 | 53.27
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