Liangxu Linux

Aug 18, 2024 · Backend Development

Why Does the Thundering Herd Problem Still Appear with epoll? Deep Dive and Fixes

This article explains the thundering herd phenomenon in multi‑process/thread servers, details its performance costs, demonstrates the issue with accept() and epoll_wait() through C examples, explores thread‑level herd, and presents mitigation techniques such as accept mutexes, SO_REUSEPORT, and Nginx's handling.