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docs: clarify CPU-bound tasks on Tokio (#4105)

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Andrew Lamb 2021-09-15 08:07:52 -04:00 committed by GitHub
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tokio/src/lib.rs
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@ -205,9 +205,15 @@
//! ```
//!
//! If your code is CPU-bound and you wish to limit the number of threads used
//! to run it, you should run it on another thread pool such as [rayon]. You
//! can use an [`oneshot`] channel to send the result back to Tokio when the
//! rayon task finishes.
//! to run it, you should use a separate thread pool dedicated to CPU bound tasks.
//! For example, you could consider using the [rayon] library for CPU-bound
//! tasks. It is also possible to create an extra Tokio runtime dedicated to
//! CPU-bound tasks, but if you do this, you should be careful that the extra
//! runtime runs _only_ CPU-bound tasks, as IO-bound tasks on that runtime
//! will behave poorly.
//!
//! Hint: If using rayon, you can use a [`oneshot`] channel to send the result back
//! to Tokio when the rayon task finishes.
//!
//! [rayon]: https://docs.rs/rayon
//! [`oneshot`]: crate::sync::oneshot