@onlyzdd 请问 Python 和 aiohttp 分别是什么版本？当前环境下一直存在该问题
```
root@host ~ # python3 -V
Python 3.7.3
root@host ~ # pip3 show aiohttp | grep Version
Version: 3.7.4.post0
root@host ~ # uname -a
Linux Debian-104-buster-64-minimal 5.12.10-xanmod1-cacule ...
```

@Kobayashi 经测试，httpbin.org 确实没有问题，但 yandex.ru 与 www.google.com 均存在不同数量的请求被挂起 120~240 秒

@v2exblog 刚学所以不太了解，原来这是错误用法，受教了

@ospider 将 requests.Session() 更换为 httpx.Client() ，内存占用降低，但仍持续增长
```
Line # Mem usage Increment Occurences Line Contents
============================================================
10 25.2 MiB 25.2 MiB 1 @profile
11 def test():
12 25.2 MiB 0.0 MiB 1 executor = ThreadPoolExecutor(max_workers = 100)
13 28.2 MiB 3.1 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
14 28.5 MiB 0.3 MiB 1 wait(task)
15 28.8 MiB 0.3 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
16 28.8 MiB 0.0 MiB 1 wait(task)
17 29.0 MiB 0.3 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
18 31.3 MiB 2.3 MiB 1 wait(task)
19 31.6 MiB 0.3 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
20 35.9 MiB 4.3 MiB 1 wait(task)
21 35.9 MiB 0.0 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
22 39.0 MiB 3.0 MiB 1 wait(task)
23 39.2 MiB 0.3 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
24 41.0 MiB 1.8 MiB 1 wait(task)
25 41.0 MiB 0.0 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
26 43.8 MiB 2.8 MiB 1 wait(task)
27 43.8 MiB 0.0 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
28 45.8 MiB 2.0 MiB 1 wait(task)
29 45.8 MiB 0.0 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
30 48.1 MiB 2.3 MiB 1 wait(task)
31 48.1 MiB 0.0 MiB 503 task = [executor.submit(get, (i)) for i in range(500)]
32 49.4 MiB 1.3 MiB 1 wait(task)
33 49.4 MiB 0.0 MiB 1 s.close()
```