crossbeam-channel

crossbeam-channel is the proven choice for synchronous MPMC (multiple producer, multiple consumer) message passing in Rust. For async channels or maximum throughput, see kanal. For within-tokio communication, tokio::sync::mpsc may outperform standalone channels due to intra-thread coroutine switching. See rust-concurrent-data-structures.

Channel vs raw queue

A channel is a queue plus blocking semantics, notification, and Send + Sync safety. When you need just the queue, drop to crossbeam ArrayQueue (bounded MPMC) or rtrb (wait-free SPSC). The throughput difference is significant: bare bounded queues run 5–50× faster than channels for the same topology because they skip the blocking and notification overhead. See the-fastest-queue and concurrent-queues for context.