1.What is Jmeter?
Apache Jmeter is an open-source load testing tool built purely on Java to test the load and stress of web applications and servers. It uses the concept of multithreading where each thread acts as a resource or user to test the response of the server as in if there is an issue when there is a heavy load or is it taking too much time. The beauty of this functional testing tool lies in the fact that it involves very less coding, and easy GUI(Graphical User Interface). Also, Jmeter can now be integrated with Maven, Jenkins, and Gradle.
2.How does Apache Jmeter Works?
Jmeter uses the principle of multithreading in Java. A thread is the smallest component of a program. And multithreading allows multiple programs to run at once as a part of multitasking. The biggest advantage of multithreading is that all the threads are independent of each other. Also, it does not block the other and one can perform many operations together hence save time. The requests are referred to as samples in Jmeter. Though in a sample you could send in multiple threads also known as a thread group, as a response it records one thread at a time on the display. Jmeter is not a browser but rather works on a protocol level.
3.Features of Jmeter
1. Open source
Apache JMeter is an open-source testing application and free to use makes it any developer or software tester to get started with ease. Also, it's been around for more than 20 years now, hence has a good amount of documentation available for it.
2. Continuous Integration
Jmeter can be easily integrated with Jenkins, Maven, and Gradle for continuous integration support where Jenkins is an open-source automation server facilitating the development and deployment of applications.
3. Friendly GUI
Apache Jmeter has a beautiful GUI to work with. Also, people who do not want to code too much enter software testing profile. And Jmeter is extremely easy to use. You can install it in 10 mins and start working with it straight away.
4. Apache Jmeter Recorder
Even writing test cases has been automated by Apache JMeter. You go to templates, go to a website and the test plan has been recorded. Could you ask more about any more automation? It's gorgeous!!!
5. Testing Web Protocols
Apache Jmeter allows you to test almost all the protocols: HTTP, HTTPS, and servers working on asp.net, node.js, PHP, Java. Even though Jmeter is pure java based application, but you can test any server through it.
6. Testing Web Services
Both types of Web Services can be tested via Jmeter Soap Based and Rest Based. Traffic, response time could be easily calculated based on the same. Also distributed testing is also possible via Jmeter when there is no centric server.
7. LDAP Test Plan
One can even build an LDAP test plan as LDAP is heavily used in the industry to allow people in a particular domain to have access to a site or server. That also can Jmeter be used for.
8. Testing Mails and POP servers
Jmeter is termed as a load testing application tool and hence not restricted to servers, web applications, or mobile applications. There is a load on mailing servers as well when the same mail has to reach out to millions of people at once. The load capacity on the server must be known.
9. Clean Jmeter Listeners
Jmeter has its own response record mechanism via listeners. It is absolutely clean , and the .jmx file is easy to read. Most importantly though JMeter sends requests to thousands of people at the same time, listeners though record one result at a time.
10. Writing Scripts with functions
And to write logics, provision of variables, and functions, since it is java based tool people associated with java can get started immediately. Functions are used to provide dynamic input to the code.
4.Load Testing Vs Stress Testing
Before proceeding ahead, it is absolutely imperative to talk about load testing vs stress testing as Jmeter is all about performance testing. And these terms would be used throughout the tutorial and they indeed have different yet similar meanings. So, let us get these two terms straight.
Load means the number of requests, traffic, and users the server could handle at a given point of time reference. It is a reference number to quantify the performance of the server. If we say that server could take 50K requests, it could also take say maybe 70K requests but the performance till 50K has been tested and would be up to the mark. That is wont be delays in responses, would not hang or break.
Stress testing is to go beyond the tested load and now check the behaviour of the product. If a server has 50K capacity, beyond that testing to see the issues that could raise, find a solution and enhance the product is what comes under stress testing. To get to know what exact un behaviour pattern could be found. Stress testing could even down the servers, cause the code to stop with multiple exceptions!
1. Apache Jmeter is a testing tool designed for performance testing which works at the protocol level.
2. Apache Jmeter uses the concept of multi-threading to send multiple simultaneous requests to the server.
3. Apache Jmeter has various functionalities to it like browser recorder, listeners, samplers, Jenkins integration
4. Load testing tests the application by sending huge data at a point of time to make sure the application works properly.
5. Stress testing goes beyond the load limit to check issues in code or performance delays because of the huge data.