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This article is about how to install and configure JMeter. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1. Introduction of JMeter

Apache JMeter is a 100% pure JAVA desktop application designed to test client / server architecture (such as web applications). It can be used to test the performance of static and dynamic resources, such as static files, Java Servlet,CGI Scripts,Java Object, databases, FTP servers, and so on. JMeter can be used to simulate large loads to test the robustness of a server, network, or object or to analyze overall performance under different loads.

At the same time, JMeter can help you do regression testing of your application. Verify that your program returns the expected value through the test script and assertions you created. For greater adaptability, JMeter allows you to use regular expressions to create these assertions.

Comparison between JMeter and LoadRunner

JMeter is an open source (typical open source tool: unattractive interface) testing tool, although it has many shortcomings compared with LoadRunner, such as: its result analysis ability is not as detailed as LoadRunner; it also has many advantages:

Open source, it is an open source free software, you don't have to pay any fee to use it.

Small, compared to the size of LR (the latest LR11 is close to 4GB), it is very small and does not require installation, but requires a JDK environment because it is a tool developed using java.

Powerful, jmeter was designed as a simple web performance testing tool at the beginning, but now it can complete the testing of database, FTP, LDAP, WebService and so on. Because of its open source, of course, you can also expand its functions according to your own needs.

The biggest difference between the two: jmeter does not support IP spoofing, while LR does.

Shortcomings of JMeter

You can't verify the JS program or the page UI with JMeter, so you need to work with Selenium to test the Web2.0 application.

Download and install JMeter

1) JMeter installation

1. Http://jmeter.apache.org/ download the latest version of JMeter and extract the files to any directory

two。 Install JDK and configure the environment variable JAVA_HOME.

3. System requirements: JMeter2.11 requires a version above JDK1.6 to support running

4. JMeter can run on the following operating systems: Unix,Windows and Open VMS.

5. Avoid installing JMeter in a path with spaces, which can lead to problems with remote testing.

2) JMeter plug-in installation

1. Plug-in download address: http://jmeter-plugins.org/downloads/all/

two。 Unzip the plug-in after download: find JMeterPlugins-Extras.jar and place JMeterPlugins-Extras.jar in the apache-jmeter-2.12\ lib\ ext directory.

III. JMeter operation

1. Go to the bin directory and run jmeter.bat to start jmeter

Note: when opening, there will be two windows, the command window of JMeter and the graphical interface of JMeter. You cannot close the command window.

2. Classpath of JMeter:

If you want to add other JAR files to JMeter's classpath, you must copy them to the lib directory

If you have developed a JMeter-specific component or a valid jar file, copy it to the ext directory in the lib directory.

3. After opening it, Chinese is displayed. If you want to use other languages, such as English, you can use the menu option-> Select language-> English. Of course, the same is true for switching to Chinese.

4. JMeter test plan components

Open the Jmeter page: including test plan + workbench.

1. Test Plan (Test Plan): used to describe a performance test, including all the functions related to this performance test. In other words, all the content of this performance test is based on a plan.

Right-click the Test Plan pop-up menu:

Note:

The function Test Mode check box, if selected, causes Jmeter to record data from each sample returned by the server. If you select a file in the test listener, the data will be written to the file. This is useful if you try a smaller test to ensure that Jmeter is configured correctly and that your server is returning the desired results. The consequence of this is that the file will grow rapidly and the efficiency of Jmeter will be affected.

If you do not record the data to a file, this option is no different.

2. Threads (Users) thread users

Although there are three options for adding thread groups with different names, after creation, the interface is exactly the same. The previous version had only one thread group name. Now there is one more setUp theread Group and terDown Thread Group.

1) setup thread group

A special type of ThreadGroup that can be used to perform pre-test operations. These threads behave exactly like a normal thread group component. The difference is that these types of threads perform periodic thread group execution before performing the test.

SetUp Thread Group is similar to init of lr. Can be used to perform pre-test operations.

2) teardown thread group.

A special type of ThreadGroup that can be used to perform post-test actions. These threads behave exactly like a normal thread group component. The difference is that these types of threads execute periodic thread groups after the end of the test.

TearDown Thread Group is similar to end of lr. Can be used to perform post-test actions.

3) thread group (thread group).

This is the thread we usually add to run. Generally speaking, a thread group can be regarded as a virtual user group, and each thread in the thread group can be understood as a virtual user. The number of threads contained in a thread group does not change during test execution.

Controller

JMeter has two types of controllers: sampler (sample) and logic controller (Logic Controller), which are used to drive and process a test.

4. Sampler (Sampler)

The Sampler is the minimum unit that sends requests to the server, records the response information and records the response time in the performance test. JMeter natively supports a variety of different sampler, such as HTTP Request Sampler, FTP Request Sampler, TCP Request Sampler, JDBC Request Sampler and so on. Each different type of sampler can send different types of requests to the server according to the set parameters.

Among all the Sampler of Jmeter, Java Request Sampler and BeanShell Requst Sampler are two special customizable Sampler.

6. Configuration components (Config Element)

The configuration element (config element) is used to provide support for static data configuration. CSV Data Set config can form local data files into a data pool (Data Pool), while configuration components corresponding to types such as HTTP Request Sampler and TCP Request Sampler can modify the default data of Sampler.

For example, HTTP Cookie Manager can be used to manage the cookie of HTTP Request Sampler.

The default value of a HTTP request does not trigger Jmeter to send an http request, but simply defines the default properties of the HTTP request.

8. Pre-processor (Per Processors)

The pre-processor is used to perform special processing of upcoming requests before the actual request is made. For example, the HTTP URL rewrite fix can implement URL rewriting, which can be used to populate the actual sessionID that made the request when there is session information such as sessionID in the RUL.

10. Assertion (Assertions)

Assertions are used to check whether the corresponding data obtained in the test are in line with expectations, and assertions are generally used to set checkpoints to ensure that the data interaction during performance testing is consistent with expectations.

5. Workbench

Thank you for reading! This is the end of this article on "how to install and configure JMeter". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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