Rick O’Brien is the President of Sempercon and author of this guest post. SemperCon is a custom software application development company that has been developing web, mobile and Internet of things applications for the last 15 years.  We have developed hundreds of custom designed applications for a variety of vertical markets and also provide ongoing support services for the majority of our clients.   We provide functional testing for all clients and work closely with them toRead More →

All the Ways to Compare JMeter Load Tests

In this post, we will review and compare the different approaches available for comparing two or more JMeter load tests. This is a task we are frequently asked, and the answer often depends ultimately on the requirements of your project. Some of these methods may be used to generate one-off comparisons, while others comprise a system of data collection for comparing many tests over extended runs. We will briefly explain the premise for each of theseRead More →

Using ChatGPT to Analyze JMeter Load Test Results

In a previous post we discussed how ChatGPT could be used to assist and partially automate JMeter test plan creation. In this post, we will explore how ChatGPT can be used to help analyze and compare JMeter load test results. I’d like to take a more illustrative approach showing the types of tasks that ChatGPT is good at solving. This will give you a better idea of how to structure queries and get the most outRead More →

Compare JMeter Test Results

A common approach to load testing often involves running a series of load tests to ascertain the performance of a target test application. The question that is sometimes asked is how to compare JMeter test results from two or more runs of a similar JMeter test on the same graph. In this article we will show you how to compare the results of two separate load tests using the Merge Results plugin. In a previous postRead More →

Overlooked JMeter Plugins You May Not Know About

We previously talked about the Top 10 JMeter Plugins and the versatility of JMeter through the use of plugins. We overviewed the top ten most popular plugins for JMeter that test designers are using today. In this follow-on post we’ll overview some overlooked JMeter plugins – some of which you may want to know about. Results and Reporting Synthesis Report – Using this plugin, you can create a separate *.JTL file that contains filtered results from yourRead More →

ChatGPT Assisted JMeter Load Testing

There has been a lot of excitement surrounding large language models (LLMs) and especially ChatGPT made available by OpenAI. Heralded as a paradigm in making powerful AI capabilities widely accessible, the GPT-3.5 and GPT-4 models behind the ChatGPT interface continue to find uses in business, data science, linguistics, and writing that did not exist in the short time before their release. In this article, we will illustrate how the LLM behind ChatGPT can be leveraged toRead More →

TCP/IP Testing using the JMeter TCP Sampler

While the primary focus of JMeter is on application-level HTTP-based testing, it also supports protocol-level TCP/IP testing using the TCP sampler.  In this post, we will review the basic setup of the TCP Sampler, and how to use it in your JMeter tests. This component allows JMeter testers to simulate network-level protocols and evaluate the performance of systems that rely on TCP/IP messaging, but not necessarily HTTP calls. Examples of these include internet of things (IoT)Read More →

JMeter 5.6.2

RedLine13 now supports JMeter 5.6.2 as it has been made a generally available release.  You can find all the updates in the Release Notes for JMeter, but we have highlighted a few important changes below: Multiple Security Fixes There are multiple security fixes that have been released between versions 5.6 and 5.6.2 of JMeter.  One particular security vulnerability in JMeter version 5.5 was recently discovered and described as a critical issue.  In exploiting this, it couldRead More →

How to Select the Best JMeter Thread Group

In this article, we will describe when it might be best to use each type of JMeter Thread Group.  Examples of test plan elements that a thread group may contain include HTTP samplers, logical preprocessors and postprocessors, timers, and many other components within a test plan.  The most elementary component is the basic Thread Group, which is a simple container for requests and other operations in many JMeter tests. Types of JMeter Thread Groups JMeter offersRead More →

The JMeter Open Model Thread Group

In previous blog posts we covered how the basic Thread Group is extended to perform more advanced functionality through the Custom Thread Groups package, and other similar plugins such as the Arrivals Thread Group.  One that we have yet to discuss is the Open Model Thread Group.  Presently, this built-in thread group is still marked as experimental, however it is available and used in current production releases in JMeter. Conceptually the Open Model Thread Group isRead More →