FastAPI同步与异步性能测试

Question

我编写了简单的FastApi服务器，我想在其中进行性能测试。这意味着我想测试异步与同步端点，但是我总是得到相同的结果。我不明白的概念或我做错了什么？

from fastapi import FastAPI
import time
import asyncio
app = FastAPI()


@app.get("/hello")
def say_hello():
    time.sleep(5)


@app.get("/hello-async")
async def say_hello():
    await asyncio.sleep(5)

我像这样运行服务器： Gunicorn Main：App - Workers = 4-劳动级uvicorn.workers.uvicornworker - bind 0.0.0.0.0：8000

并进行性能测试：

ab -n 80 -c 8 http://localhost:8000/hello-async
ab -n 80 -c 8 http://localhost:8000/hello

得到了这种结果：

This is ApacheBench, Version 2.3 <$Revision: 1879490 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient).....done


Server Software:        uvicorn
Server Hostname:        localhost
Server Port:            8000

Document Path:          /hello-async
Document Length:        4 bytes

Concurrency Level:      8
Time taken for tests:   55.016 seconds
Complete requests:      80
Failed requests:        0
Total transferred:      10240 bytes
HTML transferred:       320 bytes
Requests per second:    1.45 [#/sec] (mean)
Time per request:       5501.634 [ms] (mean)
Time per request:       687.704 [ms] (mean, across all concurrent requests)
Transfer rate:          0.18 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.1      0       1
Processing:  5000 5001   0.6   5001    5003
Waiting:     5000 5001   0.6   5001    5003
Total:       5000 5001   0.6   5001    5003

Percentage of the requests served within a certain time (ms)
  50%   5001
  66%   5002
  75%   5002
  80%   5002
  90%   5002
  95%   5002
  98%   5003
  99%   5003
 100%   5003 (longest request)

我想模拟I/O操作，如果我调用API或数据库，我想知道异步方法的速度更快。现在发生了什么，我得到了同一时间进行测试。

如果我要进行CPU密集操作，我会明白，我会得到相同的结果。我做错了什么？

同样，在同步方法中，Web服务器仅限于产生的数字线程，但是Async方法的理论限制是什么？另外，我如何在同步方法和异步方法中测试限制线程的数量，事件循环的极限是什么？