Crate Echo 

Echo: Work-Stealing Task Scheduler

Echo keeps every CPU core busy. It uses a lock-free work-stealing queue (crossbeam-deque) so that idle threads automatically pick up tasks from busy ones. No central bottleneck, no wasted cores.

Why Echo Instead of tokio::spawn

Tokio is great for I/O-bound work, but CPU-bound tasks (parsing, diffing, indexing) block the executor. Echo provides:

• Priority levels: UI-blocking tasks pre-empt background indexing
• Work stealing: Idle workers take from busy workers’ queues
• Structured shutdown: Graceful drain with timeout

Usage

use Echo::Scheduler::SchedulerBuilder;
use Echo::Task::Priority;

let Scheduler = SchedulerBuilder::new().Workers(4).Build();
Scheduler.Submit(Priority::High, async { /* critical work */ });
Scheduler.Submit(Priority::Low, async { /* background indexing */ });

Modules

• Scheduler: Builder and runtime for the worker pool
• Queue: Lock-free work-stealing deque wrapper
• Task: Task definition with priority levels

Modules

Queue

Queue Module

Scheduler

Scheduler Module

Task

Task Module