performance-concurrency-handling-multiple-simultaneous-requests-to-a-vllm-asynchron-c80e212c

THEN Implement concurrency control: use asyncio.Semaphore to limit the number of concurrent requests to the vLLM engine, or queue requests and process them sequentially. Consider upgrading to a newer version if a fix is available.

import asyncio
semaphore = asyncio.Semaphore(4)

async def limited_request(prompt):
    async with semaphore:
        return await engine.generate(prompt)