木綿(momen) is low overhead thread pool library. 木綿(momen) means cotton in Japanese.
rust
use momen::prelude::*;
fn daxpy(alpha: f64, x: &[f64], y: &mut [f64]) {
y.iter_mut().zip(x.iter()).for_each(|(y, x)| *y += alpha * *x);
}
let thread_pool = ThreadPoolDyn::new();
let n = thread_pool.max_len();
let mut x = Vec::with_capacity(1000);
let mut y = vec![0f64; 1000];
for i in 0..1000 {
x.push(i as f64);
}
let chunck_size = (1000 + n - 1) / n;
let alpha = std::f64::consts::PI;
x.chunks(chunck_size)
.zip(y.chunks_mut(chunck_size))
.par_for_each_dyn(&|(x, y)| daxpy(alpha, x, y), &thread_pool);
for i in 0..1000 {
assert_eq!(alpha * x[i], y[i]);
}