locust性能测试入门

好文推荐：https://blog.csdn.net/JOJOY_tester/article/details/77926470

单个cpu运行：locust -f my_locust_file.py

分布式多cpu运行：

1、启动locust：locust -f my_locust_file.py --master &

2、一个slave表示启动一个cpu：locust -f my_locust_file.py --slave --master-host=127.0.0.1 &

3、locust -f 被执行的文件.py --step-load 逐步增加 "Number of users to increase by step" 逐步增加用户数； "Step duration"步长持续运行时间

图中第一个参数是指递增之后的最大用户数

no-web方式运行，主要用于调试脚本：locust -f locust_files/my_locust_file.py --no-web --csv=locust -c10 -r2 --run-time 1h30m

event的例子通俗易懂：https://www.cnblogs.com/lovesoo/p/7719070.html

基础http接口示例：

#coding:utf-8
from locust import HttpLocust, TaskSet, task

class UserBehavior(TaskSet):
    def on_start(self):
        """ on_start is called when a Locust start before any task is scheduled """
        self.login()

    def login(self):
        self.client.post("/login", {"username":"ellen_key", "password":"education"})

    @task(2)
    def index(self):
        self.client.get("/")

    @task(1)
    def profile(self):
        self.client.get("/profile")

class WebsiteUser(HttpLocust):
    task_set = UserBehavior
    host='http://example.com'
    min_wait = 5000
    max_wait = 9000

通用协议接口示例：

TestHttpbin是测试人员是将待测的接口封装成测试类，CustomClient是一个会触发request_success和request_failure事件的自定义客户端，CustomLocust继承了Locust的类，将Locust中的client实例化成我们的自定义客户端CustomClient

import time
from locust import Locust, TaskSet, events, task
import requests


class TestHttpbin(object):
    def status(self):
        try:
            r = requests.get('http://httpbin.org/status/200')
            status_code = r.status_code
            print status_code
            assert status_code == 200, 'Test Index Error: {0}'.format(status_code)
        except Exception as e:
            print e


class CustomClient(object):
    def test_custom(self):
        start_time = time.time()
        try:
            # add your custom test function here
            TestHttpbin().status()
            name = TestHttpbin().status.__name__
        except Exception as e:
            total_time = int((time.time() - start_time) * 1000)
            events.request_failure.fire(request_type="Custom", name=name, response_time=total_time, exception=e)
        else:
            total_time = int((time.time() - start_time) * 1000)
            events.request_success.fire(request_type="Custom", name=name, response_time=total_time, response_length=0)


class CustomLocust(Locust):
    def __init__(self, *args, **kwargs):
        super(CustomLocust, self).__init__(*args, **kwargs)
        self.client = CustomClient()


class ApiUser(CustomLocust):
    min_wait = 100
    max_wait = 1000

    class task_set(TaskSet):
        @task(1)
        def test_custom(self):
            self.client.test_custom()