164-java-profiling-verify
This Claude Code skill automates verification of Java performance optimizations by comparing profiling data before and after code refactoring. Use it when you need to validate that performance changes actually improved memory, CPU, garbage collection, or threading behavior through rigorous side-by-side analysis, flamegraph comparison, and regression detection while maintaining identical test conditions between baseline and post-refactoring measurements.
git clone --depth 1 https://github.com/jabrena/cursor-rules-java /tmp/164-java-profiling-verify && cp -r /tmp/164-java-profiling-verify/skills/164-java-profiling-verify ~/.claude/skills/164-java-profiling-verifySKILL.md
# Java Profiling Workflow / Step 4 / Verify results Verify performance optimizations through rigorous before/after comparison: ensure baseline and post-refactoring profiling data use identical test conditions, generate post-refactoring reports, compare metrics (memory, CPU, GC, threading), perform side-by-side flamegraph analysis, document findings in profiling-comparison-analysis-YYYYMMDD.md and profiling-final-results-YYYYMMDD.md, and validate success criteria. **What is covered in this Skill?** - Pre-refactoring baseline: run profiler with same load before changes - Post-refactoring: generate new reports with identical test conditions - Comparison: memory (leaks, allocations, GC), CPU (hotspots, contention), visual flamegraph comparison - Documentation: profiler/docs/profiling-comparison-analysis-YYYYMMDD.md, profiler/docs/profiling-final-results-YYYYMMDD.md - File naming: baseline/after suffixes, timestamp-based organization - Validation: verify reports exist, compare metrics, identify regressions **Scope:** Identical test conditions are critical. Document test scenarios. Validate application runs with refactored code before generating new reports. ## Constraints Use identical test conditions between baseline and post-refactoring. Verify both report sets are complete. Document test scenarios. - **CONSISTENCY**: Use identical test conditions and load patterns for baseline and post-refactoring - **VALIDATE**: Ensure both baseline and post-refactoring reports exist and are non-empty before comparison - **DOCUMENT**: Record test scenarios and load patterns for reproduction - **BEFORE APPLYING**: Read the reference for comparison templates and validation steps - **EDGE CASE**: If request scope is ambiguous, stop and ask a clarifying question before applying changes - **EDGE CASE**: If required inputs, files, or tooling are missing, report what is missing and ask whether to proceed with setup guidance ## When to use this skill - Verify performance fix - Verify the performance - Verify the memory - Verify the threading - Verify the GC - Verify the profiling - Verify the profiling - Performance benchmark ## Workflow 1. **Read verification reference and confirm baseline data** Read `references/164-java-profiling-verify.md` and verify baseline artifacts exist and are non-empty. 2. **Generate post-refactoring profiling data** Run profiling with identical load/test conditions to produce comparable post-refactoring artifacts. 3. **Compare before/after metrics and visuals** Perform quantitative comparisons for memory/CPU/GC/threading and side-by-side flamegraph analysis. 4. **Document final verification outcome** Create comparison and final results reports with regressions, gains, and reproducible scenario details. ## Reference For detailed guidance, examples, and constraints, see [references/164-java-profiling-verify.md](references/164-java-profiling-verify.md).
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