Locust: Load test your REST API

Recently, I wanted to load test one of my applications. In my previous projects, I have used Apache JMeter and Gatling. Both of them are great tools but I wanted something with ease of Apache Benchmark and web user interface. In my limited experience with Gatling and JMeter, I found that it takes time to get started with these tools. I don’t use these tools daily so there is always a learning curve for me.

My quest for an easy to use load testing tool lead me to Locust. It took me no time to get started with the tool and I was able to understand performance characteristics of my application by running a load test. I found Locust a great tool if you want to find how many request per second your system can support and how response time varies for different percentiles of requests.

Locust is an open source load testing tool written in Python. It can simulate millions of users to load test your application. It has an intuitive user interface that you can use to easily get started with it. It allows you to define custom behaviour using Python code.

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