How Node.js Actually Scales Across Multiple CPU Cores.

Описание: JavaScript execution in Node.js runs on a single main thread by default.

Yet production systems often utilize multiple CPU cores.

So how does Node.js scale across multiple CPU cores in real-world environments?

In this video, we break down the architecture behind process-level parallelism and explain how Node.js scales using multiple independent processes.

You’ll learn:

• Why one Node.js process uses one CPU core at a time
• What process-level parallelism really means
• How the Cluster module works internally
• The role of the primary process
• How child processes handle HTTP requests
• Round-robin scheduling in cluster mode
• OS-level CPU scheduling behavior
• PM2 cluster mode vs independent processes
• Why shared state must be externalised

This is a deep dive into runtime architecture and production system design.

⏱ Timeline

00:00 Single-threaded execution model
00:23 Why one process uses one core
01:08 Process-level parallelism explained
01:39 Cluster module architecture
01:56 Primary vs child process responsibilities
02:15 Cluster vs external load balancing
02:55 Worker Thread vs Processes
03:22 PM2 cluster mode explained
03:50 The in-memory state problem
04:07 Final architectural summary

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