Performance testing with JMeter

 100% pure Java desktop application  Designed to load test client/server software (such as a web application )  JMeter can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types.

 Stefano Mazzocchi of the Apache Software Foundation was the original developer of JMeter.  He wrote it to test the performance of Apache JServ (later renamed Apache Tomcat project).

 Click the following link to download the Jmeter zip folder ◦ jmeter zip jmeter zip  To install a release build, simply unzip the zip/tar file into the directory where you want JMeter to be installed. ◦ We will use C:/JMeter  Provided that you have a JRE/JDK correctly installed and the JAVA_HOME environment variable set, there is nothing more for you to do.

 The installation directory structure should look something like this

 To run Jmeter ◦ run the jmeter.bat (for Windows) ◦ run jmeter.sh (for Unix)  These files are found in the bin directory.  After a short pause, the JMeter GUI should appear.

 A test plan describes a series of steps JMeter will execute when run.  A complete test plan will consist of one or more ◦ Thread Groups ◦ Logic conrollers ◦ Sample generating controllers ◦ Listeners ◦ Timers ◦ Assertions ◦ Configuration elements

 All controllers and samplers must be under a thread group.  The thread group element controls the number of threads JMeter will use to execute your test.  The controls for a thread group allow you to: ◦ Set the number of threads ◦ Set the ramp-up period ◦ Set the number of times to execute the test

 These drive the processing of a test.  Two types of Controllers: ◦ Samplers ◦ Logical Controllers.  Samplers tell JMeter to send requests to a server.  Logical Controllers let you customize the logic that JMeter uses to decide when to send requests.

 Provide access to the information JMeter gathers about the test cases while JMeter runs.  Additionally, listeners can direct the data to a file for later use. Every listener in JMeter provides a field to indicate the file to store data to.  There is also a Configuration button which can be used to choose which fields to save, and whether to use CSV or XML format.  Note that all Listeners save the same data; the only difference is in the way the data is presented on the screen.  Listeners can be added anywhere in the test, including directly under the test plan. They will collect data only from elements at or below their level.