> and crates like num_cpus https://doc.rust-lang.org/std/thread/fn.available_parallelism.html https://doc.rust-lang.org/std/thread/fn.available_parallelis... —

> and crates like num_cpus https://doc.rust-lang.org/std/thread/fn.available_parallelism.html https://doc.rust-lang.org/std/thread/fn.available_parallelis... — Rust 1.59