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161-java-profiling-detect

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Original

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Translation

Chinese

Java Profiling Workflow / Step 1 / Collect data to measure potential issues

Java性能分析工作流 / 步骤1 / 收集数据以排查潜在问题

Set up the Java profiling detection phase: automated environment setup with async-profiler v4.0, problem-driven interactive profiling scripts, and comprehensive data collection for CPU hotspots, memory leaks, lock contention, GC issues, and I/O bottlenecks. Uses JEP 518 (Cooperative Sampling) and JEP 520 (Method Timing) for reduced overhead.
What is covered in this Skill?
  • Run application with profiling JVM flags (run-java-process-for-profiling.sh)
  • Interactive profiling script (profiler/scripts/profile-java-process.sh) — copy exact template
  • Directory structure: profiler/scripts/, profiler/results/, profiler/current/
  • Automated OS/architecture detection and async-profiler download
  • CPU, memory, lock, GC, I/O profiling modes
  • Flamegraph and JFR output with timestamped results
Scope: Use the exact bash script templates without modification or interpretation.
设置Java性能分析检测阶段：使用async-profiler v4.0自动配置环境、问题驱动的交互式分析脚本，以及针对CPU热点、内存泄漏、锁竞争、GC问题和I/O瓶颈的全面数据收集。通过JEP 518（协作采样）和JEP 520（方法计时）降低性能开销。
本技能包含哪些内容？
  • 使用性能分析JVM参数运行应用（run-java-process-for-profiling.sh）
  • 交互式性能分析脚本（profiler/scripts/profile-java-process.sh）—— 直接复制模板即可
  • 目录结构：profiler/scripts/、profiler/results/、profiler/current/
  • 自动检测操作系统/架构并下载async-profiler
  • CPU、内存、锁、GC、I/O性能分析模式
  • 生成带时间戳的火焰图和JFR输出结果
适用范围： 直接使用bash脚本模板，请勿修改或自行解读。

Constraints

约束条件

Copy bash scripts exactly from templates. Ensure JVM flags are applied for profiling compatibility. Verify Java processes are running before attaching profiler.
  • CRITICAL: Copy the bash script templates exactly — do not modify, interpret, or enhance
  • SETUP: Create profiler directory structure: profiler/scripts, profiler/results
  • EXECUTABLE: Make scripts executable with chmod +x
  • BEFORE APPLYING: Read the reference for exact script templates and setup instructions
直接从模板复制bash脚本。确保应用了兼容性能分析的JVM参数。在连接性能分析工具前，请确认Java进程正在运行。
  • 重要提示：直接复制bash脚本模板——请勿修改、解读或优化
  • 设置要求：创建profiler目录结构：profiler/scripts、profiler/results
  • 可执行性：使用chmod +x命令赋予脚本可执行权限
  • 使用前：查阅参考文档获取完整的脚本模板和设置说明

When to use this skill

何时使用本技能

  • Improve the code with profiling
  • Apply Profiling
  • Refactor the code with profiling
  • Add profiling support
  • 通过性能分析优化代码
  • 应用性能分析
  • 结合性能分析重构代码
  • 添加性能分析支持

Reference

参考资料

For detailed guidance, examples, and constraints, see references/161-java-profiling-detect.md.
如需详细指南、示例和约束条件，请查看references/161-java-profiling-detect.md。