Glommio

Glommio (pronounced glo-mee-jow or |glomjəʊ|) is a Cooperative Thread-per-Core crate for Rust & Linux based on io_uring. Like other rust asynchronous crates, it allows you to write asynchronous code that takes advantage of rust async/await, but unlike its counterparts, it doesn't use helper threads anywhere.

Key Features

Thread-per-Core Architecture: Each CPU core runs a single thread, eliminating context switches and lock contention
io_uring Based: Leverages Linux's modern asynchronous I/O interface for maximum performance
Cooperative Scheduling: Tasks yield explicitly, allowing for predictable latency and efficient resource usage
Zero Helper Threads: No background threads, no work-stealing, no surprises
CPU Pinning: Pin executors to specific CPUs for cache locality and predictable performance

Getting Started

Using Glommio is not hard if you are familiar with rust async. All you have to do is:

use glommio::prelude::*;

LocalExecutorBuilder::default()
    .spawn(|| async move {
        // Create a file
        let file = OpenOptions::new()
            .write(true)
            .create(true)
            .open("example.txt")
            .await?;
        
        // Write data asynchronously
        file.write_at(b"Hello, Glommio!", 0).await?;
        
        Ok(())
    })
    .expect("failed to spawn executor")
    .join();

Requirements

Linux kernel 5.8+ with io_uring support
Rust 1.65+ (MSRV)
512 KiB locked memory for io_uring (adjust memlock rlimit)

Resources

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

Thread-per-Core Async Rust Made Simple

Cooperative thread-per-core framework for Rust & Linux based on io_uring