Senior LevelNode JS
How do you debug production Node.js CPU spikes and kernel hangs using eBPF, Linux perf, and 0x flamegraphs?
❓ Interview Prompt: Explain production CPU profiling, V8 `--perf-basic-prof`, Linux `perf record`, and generating 0x flamegraphs.
Diagnosing production Node.js CPU spikes without stopping processes uses Linux 'perf' and 0x Flamegraphs:
Profiling Workflow:
1
Start Node with '--perf-basic-prof' to output V8 JIT symbols to '/tmp/perf-PID.map'.
2
Sample CPU stacks: 'perf record -F 99 -p <PID> -g -- sleep 30'.
3
Render SVG Flamegraph mapping CPU time spent in JS code vs V8 C++ bindings vs Linux kernel syscalls!
Code Implementation Example
bash
# Profile Node.js CPU spikes and generate Flamegraph
npx 0x --node-options="--perf-basic-prof" server.js💡Profiling production Node.js CPU spikes using 0x flamegraph generator.
🎯 Interview Key Takeaway
Use Linux perf and 0x flamegraphs to pinpoint CPU-bound V8 functions and kernel bottlenecks in production.
#perf#Flamegraphs#0x#Profiling#Senior
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