v1.python: 54s on i5 desktop 1m53.464s on i7-4890HQ
no multiprocess, naive loops
scala.v1: 27s
go.v1: 18s
go.v2: 5.151s using goroutine, channel sending lines by chunk sending entry by chunk
rust.v1: 25s using thread
rust v1.1: 15s
rust v2: 11s using global mutable lock with Arc.