Rust: reading very large files for the billion row challenge

Checking out whether memmap can help us read very large files as fast as possible, and wondering how `wc` manages to be *so* fast. This is the next bit of the Billion Row Challenge, and probably the closest part to black magic. Read my blog at https://artificialworlds.net/blog Follow me on mastodon: [@andybalaam@mastodon.social](https://mastodon.social/@andybalaam)