RRust By Example

Rust Tokio Anti-patterns

Practical tokio guide for runtime tuning and task scheduling with runnable examples and review-ready checklists.

Topic: Tokio

Search intent: High-intent search: "rust anti patterns"

Rust Tokio Anti-patterns

Problem

Teams often struggle with runtime tuning and task scheduling when code grows quickly and review cycles shorten. This guide turns that into a repeatable process.

Diagnostic checklist

  • Define one concrete failure mode before changing code.
  • Reduce to a minimal example first.
  • Validate assumptions around ownership, mutability, and API boundaries.
  • Keep fix scope small and testable.

Runnable example

rust
fn main() {
    let data = vec![1, 2, 3, 4];
    let sum: i32 = data.iter().sum();
    println!("sum={}", sum);
}

Counterexample

rust
fn main() {
    let s = String::from("hello");
    let moved = s;
    println!("{}", s); // moved value
}

How to decide in production

1. Start with correctness and explicit ownership.

2. Add instrumentation before optimizing.

3. Keep interfaces small and typed.

4. Record tradeoffs directly in code and PR description.

Related reading

Related Guides

Rust Tokio Debug Checklist

Practical tokio guide for runtime tuning and task scheduling with runnable examples and review-ready checklists.

Rust Tokio Production Guide

Practical tokio guide for runtime tuning and task scheduling with runnable examples and review-ready checklists.

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