O Engine

This article explains how Linux’s epoll mechanism, built on libevent and using red‑black trees and ready‑list queues, provides scalable I/O multiplexing for sockets, eventfd and timerfd while traditional file systems like ext4 cannot be managed directly, and outlines the key efficiency tricks behind its design.

I/O MultiplexingLinuxSocket

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Why epoll Beats select/poll: Inside Linux’s High‑Performance I/O Engine