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"https://github.com/AsfhtgkDavid/struct-threads" keywords = ["thread", "runnable", "struct", "task"] categories = ["concurrency", "rust-patterns"] +[dependencies] -[dependencies] \ No newline at end of file +[dev-dependencies] +criterion = "0.8.2" + +[[bench]] +name = "par_run" +harness = false \ No newline at end of file diff --git a/benches/par_run.rs b/benches/par_run.rs new file mode 100644 index 0000000..a047793 --- /dev/null +++ b/benches/par_run.rs @@ -0,0 +1,58 @@ +use criterion::{Criterion, criterion_group, criterion_main}; +use struct_threads::{ParallelRun, Runnable}; + +struct TestTask(u64); + +impl Runnable for TestTask { + type Output = u64; + + fn run(self) -> Self::Output { + let mut acc = 0u64; + for i in 0..2000 { + acc = acc.wrapping_add((i ^ self.0).wrapping_mul(997)); + } + acc + } +} + +fn bench_sequential(c: &mut Criterion) { + let input: Vec = (0..5000).collect(); + + c.bench_function("sequential", |b| { + b.iter(|| { + input + .iter() + .map(|&x| { + let mut acc = 0u64; + for i in 0..2000 { + acc = acc.wrapping_add((i ^ x).wrapping_mul(997)); + } + acc + }) + .collect::>() + }) + }); +} + +fn bench_par_run(c: &mut Criterion) { + let input: Vec = (0..5000).collect(); + + c.bench_function("par_run", |b| { + b.iter(|| { + input + .iter() + .map(|&x| TestTask(x)) + .collect::>() + .par_run() + .unwrap() + }) + }); +} + +fn benches(c: &mut Criterion) { + bench_sequential(c); + bench_par_run(c); +} + +criterion_group!(benches_group, benches); +criterion_main!(benches_group); diff --git a/src/lib.rs b/src/lib.rs index 9d37ff5..aecfb6f 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -21,10 +21,36 @@ //! let handle = MyTask(21).start(); //! assert_eq!(handle.join().unwrap(), 42); //! ``` +//! +//! With `struct-threads`, you can also run multiple tasks in parallel using the [`ParallelRun`] extension trait. +//! +//! # Example +//! +//! ```rust +//! use struct_threads::{Runnable, ParallelRun}; +//! +//! struct MyTask(i32); +//! +//! impl Runnable for MyTask { +//! type Output = i32; +//! +//! fn run(self) -> Self::Output { +//! self.0 * 2 +//! } +//! } +//! +//! let results = (0..10) +//! .map(MyTask) +//! .collect::>() +//! .par_run() +//! .unwrap(); +//! +//! assert_eq!(results, (0..10).map(|x| x * 2).collect::>()); +//! ``` pub mod traits; -pub use traits::{Runnable, Thread}; +pub use traits::{ParallelRun, Runnable, Thread}; #[cfg(test)] mod tests { @@ -45,4 +71,18 @@ mod tests { let handle = task.start(); assert_eq!(handle.join().unwrap(), 20); } + + #[test] + fn par_test() { + let tasks = (0..1_000_000).map(TestTask).collect::>(); + + let results = tasks.par_run().unwrap(); + assert_eq!(results, (0..1_000_000).map(|x| x * 2).collect::>()); + } + + #[test] + fn par_test_empty() { + let results = Vec::::new().par_run().unwrap(); + assert!(results.is_empty()); + } } diff --git a/src/traits.rs b/src/traits.rs index 35226db..6a50e17 100644 --- a/src/traits.rs +++ b/src/traits.rs @@ -74,3 +74,76 @@ impl Thread for T { std::thread::spawn(move || self.run()) } } + +/// An extension trait that provides a method to run multiple [`Runnable`]'s in parallel. +/// +/// This trait is automatically implemented for any `Vec` where `T` implements `Runnable`. +/// You do not need to implement this trait manually. +pub trait ParallelRun { + type Output: Send + 'static; + + /// Spawns multiple threads to execute the `run` method of each task in parallel. + /// + /// The number of threads spawned will be equal to the number of available CPU cores. + /// + /// # Returns + /// + /// Returns a [`std::thread::Result>`] containing the results of each task, in the same order as the input vector. + /// + /// # Examples + /// + /// ```rust + /// use struct_threads::{Runnable, ParallelRun}; + /// + /// struct MathTask(i32, i32); + /// + /// impl Runnable for MathTask { + /// type Output = i32; + /// + /// fn run(self) -> Self::Output { + /// self.0 + self.1 + /// } + /// } + /// + /// let tasks = vec![MathTask(1, 2), MathTask(3, 4), MathTask(5, 6)]; + /// + /// let results = tasks + /// .par_run() + /// .unwrap(); // Provided by the ParallelRun trait + /// assert_eq!(results, vec![3, 7, 11]); + /// ``` + fn par_run(self) -> std::thread::Result>; +} + +impl ParallelRun for Vec { + type Output = T::Output; + + fn par_run(self) -> std::thread::Result> { + let threads = std::thread::available_parallelism() + .map(|n| n.get()) + .unwrap_or(1) + .min(self.len()); + + if threads == 0 { + return Ok(Vec::new()); + } + + let chunk_size = self.len().div_ceil(threads); + + let mut iter = self.into_iter(); + let mut handles = Vec::with_capacity(threads); + + for _ in 0..threads { + let chunk = iter.by_ref().take(chunk_size).collect::>(); + let handle = + std::thread::spawn(move || chunk.into_iter().map(|t| t.run()).collect::>()); + handles.push(handle); + } + + let results = handles + .into_iter() + .map(|h| h.join()) + .collect::, _>>()?; + Ok(results.into_iter().flatten().collect()) + } +}