Python asyncio实战：百万级WebSocket连接优化

核心痛点

• aiohttp连接池耗尽导致503错误率突增
• event loop被DNS解析阻塞超时
• 内存占用随连接数线性增长至8GB+

破解三板斧

1. DNS解析优化

   复制

   from aiohttp import TCPConnector
   from aiohttp.resolver import AsyncResolver
   
   connector = TCPConnector(
    resolver=AsyncResolver(),
    limit=10000
   )

2. 连接分级回收

   复制

   async def connection_manager():
    while True:
        idle_count = sum(1 for ws in connections if ws.is_idle)
        if idle_count > 500:
            await ws.close(code=1000)
        await asyncio.sleep(5)

3. 消息压缩实战

   复制

   import zstandard as zstd
   import msgpack
   
   # 压缩率提升40%
   compressed = zstd.compress(msgpack.packb(data))

性能对比