动态住宅代理并发数、线程数：怎么设才合适

import time
from concurrent.futures import ThreadPoolExecutor, as_completed
from urllib.parse import quote

import requests

user = quote("USERNAME", safe="")
password = quote("PASSWORD", safe="")
proxy = f"http://{user}:{password}@proxy.proxy302.com:2222"
proxies = {"http": proxy, "https": proxy}

WORKERS = 20   # start from your calculation, not from the maximum

def fetch(url):
    started = time.monotonic()
    r = requests.get(url, proxies=proxies, timeout=(5, 20))
    return r.status_code, time.monotonic() - started

urls = ["https://example.com/"] * 200   # replace with your own URLs

with ThreadPoolExecutor(max_workers=WORKERS) as pool:
    futures = [pool.submit(fetch, u) for u in urls]
    for f in as_completed(futures):
        try:
            status, seconds = f.result()
        except requests.RequestException as exc:
            print("error", type(exc).__name__)
        else:
            print(status, round(seconds, 2))