Q70: What is V8 Code Caching and how does it speed up Node.js application cold starts?
When Node.js compiles JavaScript files into V8 bytecode, it can generate a binary cache of the compiled bytecode. On subsequent application cold starts, V8 loads the cached bytecode directly from disk via v8.compileFunction() or Module Code Caches, bypassing source code parsing and compilation phases entirely to accelerate cold start boot times.
Key Takeaways
- V8 Code Caching saves compiled bytecode to disk for reuse across application boots.
- Reduces startup latency by bypassing source parsing and bytecode generation phases.
Knowledge Check
Which compilation phase is bypassed when Node.js loads a file with V8 Code Cache available?