java-performance-profiling

What problem does it solve?

This Skill provides a repeatable workflow for diagnosing Java performance issues by combining Java Flight Recorder (JFR) with async-profiler concepts to capture evidence on CPU, allocations, and locks, build hypotheses, ship safe fixes, and verify regressions in production-safe scenarios.

Core Features & Use Cases

• Repeatable profiling loop: Confirm symptoms, capture evidence, analyze hot paths, and test fixes.
• Comprehensive coverage: CPU hot paths, allocation hotspots, lock contention, and thread state analysis with JFR-based recording guidance.
• Verification workflow: Re-measure and document improvements to produce concise, testable outcomes (baselined vs after).
• Usage scenarios: Production or staging when CPU is high, latency spikes, or memory pressure, with safety considerations for production profiling.

Quick Start

Run a controlled profiling session (30–300s) on a representative workload to identify CPU hot paths, allocations, and locks, then capture a JFR recording and document findings.