Advanced · Module 8 · Lesson 4 of 11
High-Performance Event Multiplexing: Linux epoll Architecture
Eliminate O(N) multiplexing bottlenecks using Linux epoll, configure Red-Black tree interest lists, master Edge-Triggered vs Level-Triggered notification, and prevent descriptor leaks.
By the end you can
- Instantiate and configure epoll instances using epoll_create1, epoll_ctl, and epoll_wait
- Trace kernel data structures: Red-Black tree interest lists and ready list doubly linked lists
- Differentiate Level-Triggered (LT) from Edge-Triggered (ET) event delivery semantics
- Construct non-blocking draining loops to prevent socket starvation in Edge-Triggered mode
Builds on Synchronous Multiplexing: Non-Blocking Descriptors, select, and poll.
01 · A question first
Why does an epoll server monitoring 100,000 idle connections consume virtually 0% CPU, while select() and poll() thrash CPU caches and grind to a halt under the same workload? The answer lies in moving the interest list into kernel space and using interrupt callbacks.
Make a guess before you read on.
02 · The idea
Members only
Unlock the full lesson
This lesson is part of the membership. Join to read it in full, along with every other premium deep dive.
What's inside
- Start with the problem
- How the idea works
- Production Implementation: Edge-Triggered epoll Server
- Why it is correct
- What it costs
- Pitfalls and variations
- Where it is used
03 · Practice
Asked in interviews
Something wrong with this lesson? Report a problem