Determine number of cores using Rust

Question

I want to spawn a certain number of tasks based on the cores that a machine has. Is there anything in Rust that can find the number of cores, or should I just run external commands and parse the output?

Answer 1

There's a crate to do this: num_cpus.

References:

• crates.io page

• github.com source

Add this to your Cargo.toml:

[dependencies]
num_cpus = "1.0"

Then in your source:

extern crate num_cpus;
let num = num_cpus::get();