Processes vs Threads: How Linux Really Works
Processes and threads are not the same thing — and the difference is enforced in hardware.
In this video we go under the hood of how Linux creates processes with fork(), how threads use clone(CLONE_VM) to share memory, what the CFS scheduler actually does, and why a context switch between processes is more expensive than between threads. We also cover real-world examples like Chrome's multi-process architecture, the Python GIL, and Apache vs Nginx — plus the gotchas that silently ruin production systems.
⏱ Chapters:
0:00 Hook
0:43 What is a process and a thread?
3:31 How fork() and clone() actually work
5:12 The CFS scheduler and context switches
6:58 Real-world: Chrome, Python GIL, Nginx
8:39 Gotchas: deadlocks, race conditions, zombies
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