Lesson 3.5 From Grids to Graphs: Collinearity benchmark

[4e6]

Benchmark in the collinearity exercise should include some kind of warmup to show the correct execution time.

Issue

Here I time two identical collinearity_float calls and the first one is always about 5 times slower.

It is not the case with the warmup phase:

Correct benchmark

Benchmark with warmup phase shows correct ratio for collinearity_float vs collinearity_int -- float arithmetic is only 2 times slower instead of 8