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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Caitie McCaffrey Talk: The Verification of a Distributed System

This is a great video that explains importance of developer testing in writing robust distributed system. She talked about unit testing, integration testing, and verification language that can be used to verify a system. Unit testing is the first thing a developer can do to make sure distributed system is correct. She shared a number of anecdotes in the talk that make this talk easy to understand.

Using Siege for quick and dirty load test — Apache Benchmark Alternative

Today, I wanted to run a quick and dirty load test on one of my applications. One of the alternative that most of the developers are aware of is Apache Benchmark(or ab). For some reason, ab does not work on my mac book because of Connection reset by peer errors. So, I looked around and found Siege. It is very similar to ab and works well on mac.

To test the GET request, you would run

siege http://example.com/rest/todos/3 -c 100 -r 100

To test the POST request, you would run

siege -H 'Content-Type:application/json' "http://example.com/rest/todos POST < ./data.json" -c 10 -r 1000