【Bug】RuntimeError: Engine loop has died

报错前置条件

使用vllm启动qwen2.5-32b-instruct模型后发生的报错
GPU是GeForce RTX 4090 Laptop GPU
系统是Windows 11
运行系统是WSL2-Ubuntu22.04

报错内容

INFO 10-22 22:29:31 engine.py:290] Added request chat-993cbe95e73d4a1db5d1e89e433f727a.
ERROR 10-22 22:29:32 client.py:250] RuntimeError('Engine loop has died')
ERROR 10-22 22:29:32 client.py:250] Traceback (most recent call last):
ERROR 10-22 22:29:32 client.py:250]   File "/home/ai/miniconda3/lib/python3.10/site-packages/vllm/engine/multiprocessing/client.py", line 150, in run_heartbeat_loop
ERROR 10-22 22:29:32 client.py:250]     await self._check_success(
ERROR 10-22 22:29:32 client.py:250]   File "/home/ai/miniconda3/lib/python3.10/site-packages/vllm/engine/multiprocessing/client.py", line 314, in _check_success
ERROR 10-22 22:29:32 client.py:250]     raise response
ERROR 10-22 22:29:32 client.py:250] RuntimeError: Engine loop has died
ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/responses.py", line 259, in __call__
    await wrap(partial(self.listen_for_disconnect, receive))
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/responses.py", line 255, in wrap
    await func()
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/responses.py", line 232, in listen_for_disconnect
    message = await receive()
  File "/home/ai/miniconda3/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 555, in receive
    await self.message_event.wait()
  File "/home/ai/miniconda3/lib/python3.10/asyncio/locks.py", line 214, in wait
    await fut
asyncio.exceptions.CancelledError: Cancelled by cancel scope 7f385017b9d0

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ai/miniconda3/lib/python3.10/site-packages/uvicorn/protocols/http/httptools_impl.py", line 401, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
  File "/home/ai/miniconda3/lib/python3.10/site-packages/uvicorn/middleware/proxy_headers.py", line 60, in __call__
    return await self.app(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/fastapi/applications.py", line 1054, in __call__
    await super().__call__(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/applications.py", line 113, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/middleware/errors.py", line 187, in __call__
    raise exc
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/middleware/errors.py", line 165, in __call__
    await self.app(scope, receive, _send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/middleware/cors.py", line 85, in __call__
    await self.app(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/middleware/exceptions.py", line 62, in __call__
    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 62, in wrapped_app
    raise exc
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 51, in wrapped_app
    await app(scope, receive, sender)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/routing.py", line 715, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/routing.py", line 735, in app
    await route.handle(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/routing.py", line 288, in handle
    await self.app(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/routing.py", line 76, in app
    await wrap_app_handling_exceptions(app, request)(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 62, in wrapped_app
    raise exc
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/_exception_handler.py", line 51, in wrapped_app
    await app(scope, receive, sender)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/routing.py", line 74, in app
    await response(scope, receive, send)
  File "/home/ai/miniconda3/lib/python3.10/site-packages/starlette/responses.py", line 252, in __call__
    async with anyio.create_task_group() as task_group:
  File "/home/ai/miniconda3/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 763, in __aexit__
    raise BaseExceptionGroup(
exceptiongroup.ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)

解决方案

判断是内存不足导致

d$ free -h
               total        used        free      shared  buff/cache   available
Mem:            15Gi       6.9Gi       8.2Gi        80Mi       435Mi       8.2Gi
Swap:          4.0Gi       4.0Gi       0.0Ki

从输出可以看到，系统总内存为 15GB，目前使用了约 6.9GB，剩余约 8.2GB 可用
交换空间（Swap）总共为 4GB，目前已全部使用，且没有可用的交换空间。
如果交换空间不足，会严重影响系统性能
要将交换空间设置为与你的物理内存相同的大小（15GB），可以按照以下步骤操作：

1. 创建一个新的交换文件：

   sudo fallocate -l 15G /swapfile
   

2. 设置正确的权限：

   sudo chmod 600 /swapfile
   

3. 将文件设置为交换空间：

   sudo mkswap /swapfile
   

4. 启用交换文件：

   sudo swapon /swapfile
   

5. 确认交换空间已启用：

   free -h
   

6. 要使更改永久生效，请编辑 /etc/fstab 文件，添加以下行：

   sudo vim /etc/fstab
   /swapfile swap swap defaults 0 0
   ：wq
   

这样，就能将交换空间设置为 15GB，性能完全发挥
如果/etc/fstab编辑后不起作用，可以将前面5个步骤的命令写入~/.bashrc中