转载:https://www.jianshu.com/p/6f8980cf0948
import asyncio import random import traceback from aiohttp import ClientSession, TCPConnector, client_exceptions import time URL = 'http://127.0.0.1:5000/?delay={}' async def fetch(session, i): dly = random.randint(1,8) url = URL.format(dly) start_time = time.time() try: async with session.get(url=url) as response: r = await response.read() end_time = time.time() cost = end_time - start_time msg = "第{}个查询请求,花费时间: {}s, 返回信息: {}\n".format(i, cost, r.decode('unicode-escape')) print("running %d" % i, msg) except client_exceptions.ServerTimeoutError as timeout_error: print("request timeout error: {}, url: {}".format(timeout_error, url)) except Exception as e: print("request unknown error: {}".format(traceback.format_exc())) async def chunks(sem, session, i): """ 限制并发数 """ # 使用Semaphore, 它会在第一批2000个请求发出且返回结果(是否等待返回结果取决于你的register_user方法的定义)后 # 检查本地TCP连接池(最大2000个)的空闲数(连接池某个插槽是否空闲,在这里,取决于请求是否返回) # 有空闲插槽,就PUT入一个请求并发出(完全不同于Jmeter的rame up in period的线性发起机制). # 所以,在结果log里,你会看到第一批请求(开始时间)是同一秒发起,而后面的则完全取决于服务器的吞吐量 async with sem: await fetch(session, i) async def run(num): tasks = [] # Semaphore, 相当于基于服务器的处理速度和测试客户端的硬件条件,一批批的发 # 直至发送完全部(下面定义的number/num) sem = asyncio.Semaphore(400) # 创建session,且对本地的TCP连接不做限制limit=400 # 超时时间指定 # total:全部请求最终完成时间 # connect: aiohttp从本机连接池里取出一个将要进行的请求的时间 # sock_connect:单个请求连接到服务器的时间 # sock_read:单个请求从服务器返回的时间 import aiohttp timeout = aiohttp.ClientTimeout(total=330, connect=2, sock_connect=15, sock_read=10) async with ClientSession(connector=TCPConnector(limit=400), timeout=timeout) as session: for i in range(0, num): # 如果是分批的发,就使用并传递Semaphore task = asyncio.ensure_future( chunks(sem, session, i)) # register_user(session, i)) tasks.append(task) responses = asyncio.gather(*tasks) await responses start = time.time() number = 380 loop = asyncio.get_event_loop() future = asyncio.ensure_future(run(number)) loop.run_until_complete(future) end = time.time() total = end - start with open("log", "a+", encoding="utf-8") as f: f.write('总耗时:{}秒,平均速度:{}秒\n'.format(total, total / number))