Solutions to The One Billion Row Challenge, written in Rust, with as few dependencies as possible.

To run the challenge, clone the 1brc repo and follow the instructions to generate the input file. Then, compile this repo in release mode and run the binary, specifying the version name and the input file.

❯ cargo build --release
❯ time ./target/release/billion-rows v5 measurements.txt > output_v5.txt
./target/release/billion-rows v5 measurements.txt > output_v5.txt  47.46s user 6.46s system 676% cpu 7.975 total

Each iteration on the solution is stored in a different file and can be selected at runtime via a command-line arg. The following table summarizes each version, describing the changes made from the previous version. Timings are from running on my laptop, an Apple M1 Pro with 32GB of RAM.