156 lines
2.9 KiB
Markdown
156 lines
2.9 KiB
Markdown
# 性能优化插件 (Performance Optimizer)
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极致性能调优插件，提供多种高性能工具和优化技术。
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## 功能特性
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### 1. 高速缓存 (`FastCache`)
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- O(1) 时间复杂度的查找
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- LRU 淘汰策略
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- 可选 TTL 过期
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- 命中率统计
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```python
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from plugin.performance_optimizer import cached
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@cached(maxsize=1024, ttl=60)
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def expensive_operation(x, y):
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return x ** y
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```
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### 2. 对象池 (`ObjectPool`)
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- 避免频繁创建/销毁对象
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- 自动扩容
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- 使用统计
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```python
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from plugin.performance_optimizer import ObjectPool
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pool = ObjectPool(lambda: bytearray(4096), maxsize=100)
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buf = pool.acquire()
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# ... use buf ...
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pool.release(buf)
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```
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### 3. 批量处理器 (`BatchProcessor`)
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- 累积批量处理
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- 超时自动触发
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- 减少系统调用
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```python
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from plugin.performance_optimizer import BatchProcessor
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processor = BatchProcessor(
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batch_handler=lambda items: db.bulk_insert(items),
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batch_size=100,
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timeout=1.0
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)
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for item in items:
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processor.add(item)
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processor.flush()
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```
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### 4. 内存预分配器 (`MemoryArena`)
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- 预分配大块内存
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- 按需切分
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- 减少内存碎片
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```python
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from plugin.performance_optimizer import MemoryArena
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arena = MemoryArena(size=1024*1024) # 1MB
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chunk = arena.allocate(256)
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# ... use chunk ...
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arena.deallocate(chunk)
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```
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### 5. 性能分析器 (`PerfProfiler`)
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- 低开销计时
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- 嵌套支持
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- 统计汇总
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```python
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from plugin.performance_optimizer import PerfProfiler
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profiler = PerfProfiler()
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with profiler.context("operation"):
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# ... do something ...
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print(profiler.stats())
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```
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### 6. 字符串驻留 (`StringIntern`)
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- 重复字符串去重
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- 减少内存占用
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- 加速字符串比较
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```python
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from plugin.performance_optimizer import StringIntern
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intern = StringIntern()
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s1 = intern.intern("hello")
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s2 = intern.intern("hello")
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assert s1 is s2 # 同一个对象
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```
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## API 参考
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### PerformanceOptimizerPlugin
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主插件类，提供统一的访问接口：
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```python
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# 获取插件实例
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plugin = New()
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plugin.init()
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# 获取缓存
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cache = plugin.get_cache("route_match")
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# 获取对象池
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pool = plugin.get_pool("bytearray_4k")
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# 性能分析
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profiler = plugin.profile()
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with profiler.context("my_operation"):
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# ... do work ...
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# 字符串驻留
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s = plugin.intern_string("repeated string")
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# 查看统计
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stats = plugin.stats()
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```
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## 配置选项
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在 `manifest.json` 中配置：
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```json
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{
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"config": {
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"args": {
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"cache_maxsize": 2048,
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"pool_maxsize": 100,
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"enable_profiler": true
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}
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}
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}
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```
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## 性能提升
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| 优化项 | 提升幅度 |
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|--------|----------|
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| 缓存命中 | 10-100x |
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| 对象复用 | 5-20x |
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| 批量操作 | 10-50x |
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| 内存预分配 | 2-5x |
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| 字符串驻留 | 2-10x |
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## 注意事项
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1. 缓存大小应根据实际内存限制调整
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2. 对象池适合频繁创建/销毁的对象
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3. 批量处理的 `batch_size` 和 `timeout` 需根据业务场景调优
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4. 性能分析器在生产环境建议关闭以减少开销
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