How to setup the environment for JMeter

1. Need Java Installation-

• 1^st requirement for JMeter to install the java in your machine.
• Download the JDK and install in your machine.
• To check that JDK is installed in your system or not
  – Window- c:\> java –version
  – Linux- $ java -version

2. Download JMeter

• Now download the JMeter from the http://jmeter.apache.org/download_jmeter.cgi
• After downloading now you can start the work with JMeter.
• Here there is no need for installion.

3. Now start the work with JMeter

• For Windows – To run the jmeter.bat file from the bin folder.
• For Linux – To run the jmeter.sh file from the bin folder.

After run the file it should be shown like as-

*********Now enjoy the load and performance testing with JMeter**********

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Uses of Controllers in JMeter

JMeter has two types of Controllers:

1. Samplers
2. Logic Controllers

1. SAMPLERS:

• Samplers allow JMeter to send specific types of requests to a server.
• They simulate a user’s request for a page from the target server.
• For example, you can add a HTTP Request sampler if you need to perform a POST, GET, DELETE on a HTTP service
• Some useful samplers are:
  – HTTP Request
  – FTP Request
  – JDBC Request
  – BSF Request
  – SOAP/XML Request
  – RPC Requests

FTP Request:
This controller lets you send an FTP “download file” or “upload file” request to an FTP server.

For example, if you want to download a file “Test.txt” from a FTP server under test, you need to configure some parameters in JMeter as figure below-

JMeter will send FTP command to FTP server ftp.example.com, and then download a file Test.txt from that server.

HTTP Request:

• This sampler lets you send an HTTP/HTTPS request to a web server.
• JMeter send a HTTP request to Google website and retrieve HTML files or image from this website.

JDBC Request:

• This sampler lets you execute Database Performance Testing. It sends a JDBC Request (an SQL query) to a database.

For example, a database server has a field test result stored in a table name test_tbl. You want to query this data from the database server; you can configure JMeter to send a SQL query to this server to retrieve data.

2. LOGIC CONTROLLERS:

• Logic Controllers let you control order of processing of Samplers in a Thread.
• Logic Controllers can change the order of request coming from any of their child elements.
• Some examples are: For Each Controller, While Controller, Loop Controller, IF Controller, Run Time Controller, Interleave Controller, Throughput Controller, and Run Once Controller.
• A Loop Controller Control Panel looks like the following figure:

The following list consists of all the Logic Controllers JMeter provides:

• Simple Controller
• Loop Controller
• Once Only Controller
• Interleave Controller
• Random Controller
• Random Order Controller
• Throughput Controller
• Runtime Controller
• If Controller
• While Controller
• Switch Controller
• For Each Controller
• Module Controller
• Include Controller
• Transaction Controller

Listeners:

• Listeners: shows the results of the test execution.
• They can show results in different format such as tree, table, graph or log file

The following list consists of all the Listeners JMeter provides:

Timers:

• By default, a JMeter thread will send requests without pausing between each sampler.
• This may not be what you want. We can add a timer element which will allow us to define a period to wait between each request.

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What is Thread Group in the Jmeter ?

Thread group in the Test Plan- 

Thread Group: A test plan must have at least one thread group.

 

Number of Threads (users): Simulates the number of user(s) or connection(s) to your server application.
Or
Number of Threads: 100 (Number of users connects to target website: 100)

Loop Count: Defines the number of times to execute the test.
Or
Loop Count: 10 (Number of time to execute testing)

Ramp-Up Period: It tells JMeter how long to delay before starting next user.
Or
Ramp-Up Period: 100

For example, if we have 100 users and a 100 second Ramp-Up period, then the delay between starting users would be 1 second (100 users /100 seconds)

 

Scheduler checkbox: Once selected, the Scheduler Configuration section will appear at the bottom of the control panel.

Scheduler Configuration: You can configure the start and end time of running the test.

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Introduction to Apache JMeter Performance Testing

Introduction to Apache JMeter:  JMeter works only on two fields:

1. Test Plan
2. Workbench

1.Test Plan:

• Test Plan defines what to test and how to execute no of steps in jmeter.

For ex: Web application as well as the client server application. It can be viewed as a container for running tests.

• A test plan must have at least one thread group.
• A complete test plan will consist of one or more elements such as
• Thread groups
• Logic controllers
• Sample-generating controllers
• Listeners
• Timers
• Assertions
• Configuration elements.

2.Workbench:

• It’s Provide a place to store test elements temporarily.
• JMeter doesn’t save the content of workbench.
• JMeter only save the content of Test Plan.
• No relation with the Test Plans.