87 lines
2.9 KiB
Markdown
87 lines
2.9 KiB
Markdown
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# Flume
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A blazingly fast multi-producer, multi-consumer channel.
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[](
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https://crates.io/crates/flume)
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[](
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https://docs.rs/flume)
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[](
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https://github.com/zesterer/flume)
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```rust
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use std::thread;
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fn main() {
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println!("Hello, world!");
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let (tx, rx) = flume::unbounded();
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thread::spawn(move || {
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(0..10).for_each(|i| {
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tx.send(i).unwrap();
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})
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});
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let received: u32 = rx.iter().sum();
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assert_eq!((0..10).sum::<u32>(), received);
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}
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```
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## Why Flume?
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- **Featureful**: Unbounded, bounded and rendezvous queues
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- **Fast**: Always faster than `std::sync::mpsc` and sometimes `crossbeam-channel`
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- **Safe**: No `unsafe` code anywhere in the codebase!
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- **Flexible**: `Sender` and `Receiver` both implement `Send + Sync + Clone`
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- **Familiar**: Drop-in replacement for `std::sync::mpsc`
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- **Capable**: Additional features like MPMC support and send timeouts/deadlines
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- **Simple**: Few dependencies, minimal codebase, fast to compile
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- **Asynchronous**: `async` support, including mix 'n match with sync code
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- **Ergonomic**: Powerful `select`-like interface
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## Usage
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To use Flume, place the following line under the `[dependencies]` section in your `Cargo.toml`:
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```toml
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flume = "x.y"
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```
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## Cargo Features
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Flume comes with several optional features:
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- `spin`: use spinlocks instead of OS-level synchronisation primitives internally for some kind of data access (may be more performant on a small number of platforms for specific workloads)
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- `select`: Adds support for the [`Selector`](https://docs.rs/flume/latest/flume/select/struct.Selector.html) API, allowing a thread to wait on several channels/operations at once
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- `async`: Adds support for the [async API](https://docs.rs/flume/latest/flume/async/index.html), including on otherwise synchronous channels
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- `eventual-fairness`: Use randomness in the implementation of `Selector` to avoid biasing/saturating certain events over others
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You can enable these features by changing the dependency in your `Cargo.toml` like so:
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```toml
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flume = { version = "x.y", default-features = false, features = ["async", "select"] }
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```
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## [Benchmarks](https://what-if.xkcd.com/147/)
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Although Flume has its own extensive benchmarks, don't take it from here that Flume is quick.
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The following graph is from the `crossbeam-channel` benchmark suite.
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Tests were performed on an AMD Ryzen 7 3700x with 8/16 cores running Linux kernel 5.11.2 with the bfq scheduler.
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# <img src="misc/benchmarks.png" alt="Flume benchmarks (crossbeam benchmark suite)" width="100%"/>
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## License
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Flume is licensed under either of:
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- Apache License 2.0, (http://www.apache.org/licenses/LICENSE-2.0)
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- MIT license (http://opensource.org/licenses/MIT)
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