collections, inserters, seconds
1, 1, 131.444742
1, 2, 121.063794
1, 4, 118.671380
1, 8, 122.532000
1, 16, 134.661727
1, 32, 182.206930
2, 1, 120.543407
2, 2, 118.721543
2, 4, 122.997861
2, 8, 121.174744
2, 16, 123.929537
2, 32, 121.214957
4, 1, 116.198330
4, 2, 116.474885
4, 4, 116.483809
4, 8, 117.249348
4, 16, 119.653684
4, 32, 123.973493
8, 1, 119.548247
8, 2, 118.737400
8, 4, 117.243449
8, 8, 120.172771