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• 07:47, 17 November 2025 PC talk contribs created page Rust’s Tokio vs. Go’s M:N Scheduler: A Deep Dive into Async I/O Thread Contention (Created page with "We added more workers to the Tokio pool expecting faster throughput. Instead, tail latencies doubled and CPU utilization dropped. The problem wasn’t the scheduler or our code logic — it was the runtime and OS kernel competing for the same file descriptors during parallel async I/O. Understanding how Tokio’s work-stealing differs from Go’s cooperative M:N model explains why identical workloads can show wildly different contention patterns. How Tokio’s Work-Stea...")