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164-java-profiling-verify

164-java-profiling-verify

github.com/jabrenaTesting & quality456337 installsUpdated 1d ago
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About 164-java-profiling-verify

A Java profiling verification skill for comparing performance before and after refactoring under identical test conditions. It checks memory, CPU, GC, threading, and flamegraphs, then records reproducible findings in dated reports.

Key features

  1. 01Baseline and post-change profiling
  2. 02Identical test and load conditions
  3. 03Memory, CPU, GC, and thread comparisons
  4. 04Side-by-side flamegraph analysis
  5. 05Dated comparison and results reports
  6. 06Artifact and regression validation

Use cases

  1. 01Verify a Java performance fix
  2. 02Check for memory or GC regressions
  3. 03Compare CPU hotspots and flamegraphs
  4. 04Document reproducible profiling results

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/jabrena/plinth --skill 164-java-profiling-verify

After installing, type/164-java-profiling-verifyin Claude Code to confirm it loaded.

Bundled filesreferences/164-java-profiling-verify.md

Details

From the project README

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
  • Compare before and after profiling results
  • Performance benchmark
  • Check for performance regressions after refactoring

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.

  1. Generate post-refactoring profiling data

Run profiling with identical load/test conditions to produce comparable post-refactoring artifacts.

  1. Compare before/after metrics and visuals

Perform quantitative comparisons for memory/CPU/GC/threading and side-by-side flamegraph analysis.

  1. 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.

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