Performance - Performance Analysis#

性能分析工具，分析代码执行、识别瓶颈、提供优化建议。

Version: 1.1

Features: 性能分析、瓶颈识别、优化建议、基准测试、C/C++ 支持 (NEW)

---

Quick Start#

1. 分析 Python 代码#

bash

# 分析函数执行时间
python3 scripts/main.py profile --file src/main.py --function process_data

# 分析整个模块
python3 scripts/main.py profile --file src/main.py

2. 识别瓶颈#

bash

# 扫描代码中的性能问题
python3 scripts/main.py analyze --file src/main.py

# 分析目录
python3 scripts/main.py analyze --dir src/

3. 基准测试#

bash

# 运行基准测试
python3 scripts/main.py benchmark --file src/main.py --function heavy_computation

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Commands#

命令说明示例profile性能分析profile --file src.py``analyze瓶颈分析analyze --file src.py``benchmark基准测试benchmark --function foo

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Profile 输出#

bash

$ python3 scripts/main.py profile --file src/processor.py --function process_data

🔍 Performance Profile
======================

Function: process_data
File: src/processor.py:45
Calls: 100
Total time: 2.34s
Avg time: 23.4ms

Top hotspots:
  45% - database.query() (line 67)
  30% - json.dumps() (line 89)
  15% - data transformation (line 78)
  10% - other

Recommendations:
  ⚠️  Consider caching database results
  ⚠️  Use orjson instead of json for better performance

---

瓶颈分析#

bash

$ python3 scripts/main.py analyze --file src/api.py

🔍 Performance Analysis
=======================

File: src/api.py
Issues found: 3

🔴 High Impact:
  Line 34: Nested loop O(n²)
    for user in users:
      for order in orders:  # ← N+1 query pattern

  Suggestion: Use JOIN query instead

🟡 Medium Impact:
  Line 67: String concatenation in loop
    result += item  # ← Use list + join instead

🟢 Low Impact:
  Line 89: Unused import
    import heavy_module  # ← Remove if not used

---

基准测试#

bash

$ python3 scripts/main.py benchmark --file src/sort.py --function quicksort

⏱️  Benchmark Results
====================

Function: quicksort
Iterations: 1000

Time (ms):
  Mean:   12.34
  Median: 11.89
  Min:     8.45
  Max:    45.67
  P95:    18.90
  P99:    32.10

Memory (MB):
  Mean:   2.45
  Peak:   4.12

Comparison:
  vs bubble sort: 45x faster
  vs merge sort:  1.2x faster

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检测的优化模式#

代码层面#

问题检测建议N+1 查询✅使用 JOIN / select_related循环内字符串拼接✅使用 list + join未使用的导入✅移除导入嵌套循环✅优化算法或使用哈希重复计算✅缓存结果

Python 特定#

问题检测建议list vs generator✅大数据用 generatordict.get() vs []✅使用 .get() 避免 KeyError列表推导式✅替代 map/filter

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Configuration#

.performance.json:

json

{
  "benchmark_iterations": 1000,
  "warmup_iterations": 10,
  "profile_lines": true,
  "check_patterns": [
    "n_plus_one",
    "string_concat_in_loop",
    "unused_imports"
  ]
}

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CI/CD 集成#

yaml

# .github/workflows/performance.yml
name: Performance Check
on: [pull_request]

jobs:
  perf:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3

      - name: Analyze Performance
        run: python3 skills/performance/scripts/main.py analyze --dir src/

      - name: Run Benchmarks
        run: python3 skills/performance/scripts/main.py benchmark --all

---

Files#

text

skills/performance/
├── SKILL.md                    # 本文件
└── scripts/
    ├── main.py                 # ⭐ 统一入口
    ├── profiler.py             # 性能分析器
    └── analyzer.py             # 瓶颈分析器

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Roadmap#

• Basic profiling
• Bottleneck detection
• Benchmark runner
• Memory profiling
• Flame graph generation