參考資訊:
https://www.rust-lang.org/learn/get-started
https://github.com/quambene/rust-concurrency
http://bzz.wallizard.com:8081/share/books/RUST/Programming%20Rust%202nd%20Edition.pdf
https://www.soroushjp.com/2015/02/07/go-concurrency-is-not-parallelism-real-world-lessons-with-monte-carlo-simulations/
產生樣板
$ cargo new hello $ cd hello
Cargo.toml
[package] name = "hello" version = "0.1.0" edition = "2021" [dependencies] rand = "0.8"
src/main.rs
use rand::Rng; use std::thread; fn _pi(samples : u32) -> f64 { let mut inside : u32 = 0; let mut rng = rand::thread_rng(); for _ in 0..samples { let x : f64 = (rng.gen::<u32>() as f64) / f64::from(u32::MAX); let y : f64 = (rng.gen::<u32>() as f64) / f64::from(u32::MAX); if ((x * x) + (y * y)) < 1.0 { inside = inside + 1; } } if inside > 0 { return (f64::from(inside) / f64::from(samples)) * 4.0; } return 0.0; } fn main() { let mut handles = Vec::new(); for i in 2..=8 { let s = u32::pow(10, i); let handle = thread::spawn(move || { println!("Our value of Pi after {} runs: {}", s, _pi(s)); }); handles.push(handle); } for handle in handles { handle.join().unwrap(); } }
執行
$ cargo run Our value of Pi after 1000 runs: 3.136 Our value of Pi after 100 runs: 2.88 Our value of Pi after 10000 runs: 3.1136 Our value of Pi after 100000 runs: 3.14588 Our value of Pi after 1000000 runs: 3.142252 Our value of Pi after 10000000 runs: 3.1424932 Our value of Pi after 100000000 runs: 3.1419658