Locust is an open source performance/load testing tool for HTTP and other protocols. Its developer-friendly approach lets you define your tests in regular Python code.
Locust tests can be run from command line or using its web-based UI. Throughput, response times and errors can be viewed in real time and/or exported for later analysis.
You can import regular Python libraries into your tests, and with Locust's pluggable architecture it is infinitely expandable. Unlike when using most other tools, your test design will never be limited by a GUI or domain-specific language.
To get started right away, head over to the documentation.
Features
Write user test scenarios in plain old Python
If you want your users to loop, perform some conditional behaviour or do some calculations, you just use the regular programming constructs provided by Python. Locust runs every user inside its own greenlet (a lightweight process/coroutine). This enables you to write your tests like normal (blocking) Python code instead of having to use callbacks or some other mechanism. Because your scenarios are “just python” you can use your regular IDE, and version control your tests as regular code (as opposed to some other tools that use XML or binary formats)
from locust import HttpUser, task, between
class QuickstartUser(HttpUser):
wait_time = between(1, 2)
def on_start(self):
self.client.post("/login", json={"username":"foo", "password":"bar"})
@task
def hello_world(self):
self.client.get("/hello")
self.client.get("/world")
@task(3)
def view_item(self):
for item_id in range(10):
self.client.get(f"/item?id={item_id}", name="/item")
Distributed & Scalable - supports hundreds of thousands of users
Locust makes it easy to run load tests distributed over multiple machines. It is event-based (using gevent), which makes it possible for a single process to handle many thousands concurrent users. While there may be other tools that are capable of doing more requests per second on a given hardware, the low overhead of each Locust user makes it very suitable for testing highly concurrent workloads.
Web-based UI
Locust has a user friendly web interface that shows the progress of your test in real-time. You can even change the load while the test is running. It can also be run without the UI, making it easy to use for CI/CD testing.
Locust's code base is intentionally kept small and doesn't solve everything out of the box. Instead, we try to make it easy to adapt to any situation you may come across, using regular Python code. There is nothing stopping you from:
Scalable and flexible, with no need to host your own infrastructure
If your application is hosted on Azure, it can combine test results with detailed resource metrics to help pinpoint bottlenecks and optimize performance.
Integrates well with Azure DevOps and GitHub for CI/CD pipelines, enabling automated performance testing as part of your development workflow.
Locust 是一个开源的性能/负载测试工具，支持 HTTP 等多种协议——你用普通的 Python 代码来编写测试，然后通过命令行或网页界面来运行。