David Kellum
f545d1276b
* upgrade to rand 0.7.0 (MSRV 1.32) * upgrade to parking_lot 0.9.0 * Remove last non-dev dependency on rand crate (#1324) Use std RandomState for XorShift seeding. This allows dropping _rand_ crate dep here, accept as a dev dependency for tests or benchmarks. * increase CI MSRV to 1.31.0 * increase nightly for CI TSAN tests * add TSAN suppressions for recent rand related updates * make latest TSAN suppression patterns more general * upgrade tempfile dev dep for common rand version But avoid tempfile 3.2 for now, since history demonstrates it bumps rand versions and MSRV in MINOR updates. * update (dev dep) env_logger to latest 0.6 * reactor, threadpool: bump PATCH versions, doc links, change logs [ci-release]
1.5 KiB
Tokio Thread Pool
A library for scheduling execution of futures concurrently across a pool of threads.
Why not Rayon?
Rayon is designed to handle parallelizing single computations by breaking them into smaller chunks. The scheduling for each individual chunk doesn't matter as long as the root computation completes in a timely fashion. In other words, Rayon does not provide any guarantees of fairness with regards to how each task gets scheduled.
On the other hand, tokio-threadpool is a general purpose scheduler and
attempts to schedule each task fairly. This is the ideal behavior when
scheduling a set of unrelated tasks.
Why not futures-cpupool?
It's 10x slower.
Examples
extern crate tokio_threadpool;
extern crate futures;
use tokio_threadpool::ThreadPool;
use futures::{Future, lazy};
use futures::sync::oneshot;
pub fn main() {
let pool = ThreadPool::new();
let (tx, rx) = oneshot::channel();
pool.spawn(lazy(|| {
println!("Running on the pool");
tx.send("complete").map_err(|e| println!("send error, {}", e))
}));
println!("Result: {:?}", rx.wait());
pool.shutdown().wait().unwrap();
}
License
This project is licensed under the MIT license.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.