Learn Apache JMeter Performance testing tool with the help of this comprehensive video series of JMeter Tutorials for beginners and experienced professionals.
[Scroll down to check the list all the tutorials]
JMeter is the best open-source load testing tool to measure the performance of an application.
By the end of this series of articles and video tutorials, you would be able to understand the basic concepts of JMeter, how to send requests and modulate load factors, how to use assertions to validate responses from the server, and real-time example which can be implemented in your live projects.
This series intends to target testing professionals who are in Manual Testing and want to switch over to Performance Testing and professionals who are already doing performance testing of applications.
Here is a brief overview of what all we will be covering in this series of tutorials:
- Components of JMeter
- Test Plan, Test Scenarios Creation in JMeter and Thread Group
- Samplers, Controllers, Processors, Config Elements and Listeners
- Assertions and test execution
- Performance Tuning
Tutorial #1: Introduction, JMeter Download, and Install
Tutorial #2: JMeter Test Plan And WorkBench
Tutorial #3: Working With HTTP Requests
Tutorial #4: Working With FTP Request
Tutorial #5: Using CSV DataSet Config
Tutorial #6: User-Defined Variables
Tutorial #7: JMeter PreProcessors
Tutorial #8: JMeter Listeners
Tutorial #9: Regular Expression Extractor Post-Processor
Tutorial #10: XPath Extractor Post-Processor
Tutorial #11: JMeter Plugins
Tutorial #12: JMeter Timers
Tutorial #13: Correlation
Tutorial #14: JMeter Controllers 1
Tutorial #15: Controllers part 2
Tutorial #16: JMeter Variables And Functions
Tutorial #17: JMeter HTTPS Test Script Recorder
Tutorial #18: JMeter BeanShell Scripting Part 1
Tutorial #19: BeanShell Scripting Part 2
Tutorial #20: Integrating JMeter With Selenium
Tutorial #21: Database Testing With JMeter
Tutorial #22: Java YourKit Profiler
Tutorial #23: Blazemeter Plugin And JMeter Template
Tutorial #24: Top JMeter Interview Questions
There are many test automation tools available in the market today. WebLoad, LoadNinja, LoadRunner, LoadUIPro to name a few. But it is JMeter that has become a trending name in the industry.
Why JMeter is gaining popularity among app testers and app development industry? Does JMeter truly deserve the popularity it is gaining?
To answer this, we have to start with the basics.
What You Will Learn:
What Is JMeter?
JMeter is a powerful automated testing tool with enormous testing capabilities. It is a Java desktop application and the GUI uses the Swing graphical API. It was developed by Stefano Mazzocchi of the Apache Software Foundation. It was initially developed to do web application testing, later it extended its abilities to other areas of testing.
Why Do We Use JMeter?
While JMeter has gained immense popularity in Load testing, it is also a great tool to test other application areas like APIs, FTP servers, database performance, etc. It helps to measure and analyze the performance of web applications and other variety of services.
Let's say that your organization recently launched a commercial web application that will be accessed across the globe. Your organization is expecting that it will have hundreds and thousands of concurrent users accessing the website. So, the web servers must be able to handle the user action efficiently.
Your organization is keen to know how the web servers will perform in such situations.
As a tester, you need to provide results in such a scenario. It is not feasible for any organization to arrange that many testers to manually check the performance.
The next question which arises here is: How would you test your website in such a situation? How can you apply such a huge load on web servers and get results?
In such situations, a tool that can simulate real-time user’s behavior is required and thankfully, JMeter is such a tool that can help you do such testing. JMeter has proved to be the best tool for load testing so far.
Advantages Of JMeter
The advantages of JMeter are as follows:
- Free tool: It is a free tool. Any developer/tester can use it without spending a penny to buy the license.
- Multiple platform support: JMeter is completely based on Java. This makes the tool completely independent of the platform so that the developers can use it on a platform of their choice.
- Open Source: It is an open-source tool so it helps developers to easily customize the source code based on their requirements.
- Record and Playback feature: By using the Record and Playback option in JMeter, the tester performs its steps for testing, which is recorded by JMeter. The tester can play the recorded steps repeatedly for their testing.
- Large Resources: It is a popular load testing tool. This tool is used by a good percentage of testing professionals across the globe. You will find plenty of free tutorials and free plugins online that will help you with additional functionalities.
- Though the core functionality of JMeter is to perform load testing, it can also be aggressively used for functionality testing. Also, other areas like FTP performance, database performance, etc. can be tested using JMeter.
- JMeter can be used for testing of both static and dynamic resources in the website.
- Different types of reports (both in numbers and in graphs) are available to monitor application performance.
- Non-GUI mode of JMeter is available when a higher level of load needs to be applied on servers while testing performance.
Advantage Of JMeter Over LoadRunner
LoadRunner is a major competition for JMeter. However, there are major drawbacks in LoadRunner that make JMeter more powerful and competitive.
Here are some of the reasons:
- LoadRunner does not provide a free license and is expensive. The available trial versions are also not very easy to download and use.
- LoadRunner has limited load generation capacity however, JMeter has unlimited load generation capacity.
- JMeter provides a record and playback option, so even a black box tester (who does not know writing code) can use JMeter for testing. On the other hand, LoadRunner needs some scripting knowledge to work with it.
How JMeter Works?
JMeter simulates a heavy load on the server or group of servers to test its strength and to analyze the performance of the server when different types of loads are applied to it. To do this, JMeter creates a virtual load of different sizes and apply them on the server and measure the response times with various loads.
With the increase in load, the different components in the web application provide different response times.
#1) Add Thread Group:
Based on the expected number of users, the tester can define the threads (each thread represents a user), loop count (means how many times the test must repeat), and Ramp Up Period (means how much delay must be applied before starting the next user).
For Example, if the expected number of users accessing the website is 100 then tester sets the thread to 100 and sets a ramp-up period of 10 sec, there will be a delay before starting users would be 10 seconds (100/10).
#2) Add JMeter elements:
Elements are added through Samplers (as shown in the below image). Elements tell JMeter about which type of request is sent to which server and with what parameters. HTTP Request, FTP Request, JDBC Requests are a few of the commonly used elements.
#3) Add Graph Result:
The Listener lists various reports that provide the tester with a variety of graphical analyses of performance reports. The tester can set different reports to measure the performance.
#4) Execute Test:
Once the required settings are done, click on the “Start” icon to begin the test. Once the test is complete, the tester can view the results using Sampler as explained in the above step.
Note: The load that JMeter could generate without distorting results can be increased in two ways:
- Run the tests in nonGUI mode (using console – find more)
- Distribute the load generation to multiple JMeter servers.
While the choice of automation tool mainly depends on the requirement, cost-effectiveness, etc. We think JMeter is only going to gain more popularity among organizations, especially small to medium ones who cannot afford license costs, as it is license-free.
The virtue of being open source adds a feather in its cap!
We hope you will find this free JMeter tutorial training useful.