Ragnar Lönn

Ragnar is the founder and head of product development at Load Impact
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Recent Posts

Comparing load testing tools

Are you on the lookout for a load testing tool, but fear the time investment you’re going to have to make to install, configure and then evaluate a bunch of different tools?

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The state of load testing

(Warning to readers: this article is long and rambling, like most articles by the same author)

Once upon a time, I wrote a very simple command-line load testing tool in C. I called it "myload", partly because it was written by, well...myself, and partly as an allusion to MySQL (this was back in the days when MySQL ruled and I had yet to start using PostgreSQL).

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Open Source Load Testing Tool Benchmarks V2

 
Earlier this year, we wrote a couple of articles reviewing the functionality, usability (link to review article) and performance (link to benchmark article) of a bunch of open-source load testing tools. Si nce then, we have uncovered our own open-source load testing tool - k6 - and it would seem it is time for an update to our reviews and benchmarks, so that we both include k6 but a lso test newer versions of the other tools out there.
 
So, here are the NEW AND UPDATED op en source load testing tool benchmarks!
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Creating k6 - a developer-centric load testing tool

How we created k6 - the engineering story.

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An... other load testing tool?

As some may already know, Load Impact recently let loose upon the world yet another load testing tool - k6

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WebSocket support in k6

We’re happy to announce WebSocket support for k6!
Note that this announcement is related to the open source load testing tool k6, not to the loadimpact.com SaaS tool. 

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Open Source Load Testing Tool Review - Benchmarks

We shared our detailed analysis of open-source load testing tools in a recent review. In that review, we also promised to share the behind-the-scenes benchmarks. In this article, we'll share those benchmarks so you can see how we arrived at our performance review for each open-source load testing tool.
Remember, too, we narrowed the list for this review to what we consider to be the most popular, open-source load testing tools. This list includes:
  • Jmeter
  • Gatling
  • Locust
  • The Grinder
  • Apachebench
  • Artillery
  • Tsung
  • Vegeta
  • Siege
  • Boom
  • Wrk
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Open Source Load Testing Tool Review

There are tons of load testing tools, both open- and closed-source. Open-source tools are growing in popularity, and we use mainly open-source software (OSS) at Load Impact, so we thought it might be useful to take a deep look at the available options in a detailed open source load testing tool review. (We'll call this our version 1.0 review.)

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Random Thoughts About Go

Load Impact is here to enhance your load testing and help you find performance bottlenecks in your applications. But we also like to give you helpful engineering tips across a broad spectrum of topics. Check out this post on Go — the programming language originally developed by Google engineers.

So, I’ve started learning a bit of Go, which seems to be a language in my taste (small, fast and not too high-level), but some things are a little tricky to wrap my head around. Like, me being an old C programmer, happily discovering pointers but then getting confused by not being able to do pointer arithmetics, by pointers getting dereferenced automatically, etc. Or some things around the package system that I haven’t quite grasped.

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Determining Concurrent Users in Your Load Tests

tl;dr — This post is about using Google Analytics to determine how many concurrent users to specify in your load tests.

  • "Hourly Sessions x Average Session Duration (in seconds) / 3,600" is the formula we recommend to get started
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