The article you've shared provides a comprehensive guide for diagnosing and addressing performance issues in Node.js applications. Here are the key takeaways:
Key Points
-
Event Loop Delay Measurement:
- Use
perf_hooks.monitorEventLoopDelayto monitor event loop delays. - This helps rule out blocking code that might be causing performance degradation.
- Use
-
Connection Pool Wait Count:
- Check the connection pool wait count using tools like
clinic flame. - High wait counts indicate potential database exhaustion, which can cause latency issues.
- Check the connection pool wait count using tools like
-
Heap Growth Monitoring:
- Monitor heap growth over a period (e.g., 30 minutes) to identify memory leaks or GC pressure.
- Common sources of memory leaks include event listeners not cleaned up, closures holding references, unbounded caches, and global state accumulation.
-
CPU Profiling with Clinic Flame:
- Use
clinic flameunder load to identify CPU hotspots. - This helps pinpoint specific areas in the code that are consuming excessive resources.
- Use
-
Dependency Changes Review:
- Check recent dependency changes using
git log -- package-lock.json. - Sometimes, updates to dependencies can introduce performance issues or
- Check recent dependency changes using
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