Downloading & Installing JMeter on Windows Now finally we will learn from where we should download JMeter and how to install it on your local Windows Machine. Download Jmeter 2.10. Check the performance of servers and other services. Jmeter is a cute tool for system administrators developed in Java that allows you to test the performance of different pieces of software and hardware: Java complements, servlets, Perl scrpts, databases or FTP servers. Apache JMeter is a portable macOS application that runs on the Java platform and enables you to quickly test and analyze the performance of your web applications, together with their resources. Note that Apache JMeter is able to handle both dynamic and static resources. Effortless to deploy analysis tool for your web apps that can simulate different load types. I have downloaded Apache JMeter 3.1 version and developed a JMX script file. But all my other members use Apache JMeter 3.0 version. I am unable to open my 3.1 jmx file in 3.0 version. Can anyone s.
1) Explain what is JMeter?
JMeter is a Java tool, which is used for performance Load Testing.
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2) Explain how JMeter works?
JMeter acts like a group of users sending requests to a target server. It collects response from the target server and other statistics which show the performance of the application or server via graphs or tables.
3) Explain where you can use functions and variables?
Variables and functions can be written into any field of any test component
4) Mention what are regular expressions in JMeter?
Based on the pattern, a regular expression is used to search and manipulate text. JMeter is useful in interpreting forms of regular expression or patterns being used throughout a JMeter test plan.
5) Explain what is Samplers and Thread groups?
- Thread group: For any test plan, JMeter is the beginning part of thread group elements. It is an important element of JMeter, where you can set a number of users and time to load all the users given in the thread group
- Samplers: Sampler generates one or more sample results; these sample results have many attributes like elapsed time, data size, etc. Samplers allow JMeter to send specific types of requests to the server, through samplers, thread group decides which type of request it needs to make. Some of the useful samplers are HTTP request, FTP request, JDBC request and so on.
6) Whether the test plans built using JMeter are OS dependent?
Usually, Test Plan are saved in their XML format, so there is nothing to do with any particular O.S. It can be run on any OS where JMeter can run.
7) Mention what are the types of a processor in JMeter?
The types of a processor in JMeter are
- Pre-processor
- Post processor
8) Explain what are Pre-processor Elements? List some of the pre-processor elements?
A pre-processor is something that will happen before the sampler executes. To configure the sample request prior to its execution or to update variables that are not extracted from response text pre-processor elements are used.
Some of the pre-processor elements are
- HTTP URL re-writing modifier
- HTTP user parameter modifier
- HTML link parser
- BeanShell PreProcessor
9) Mention the execution order of Test Elements?
The test plans elements execution order is
- Configuration elements
- Pre-processors
- Timers
- Samplers
- Post-processors
- Assertions
- Listeners
10) What does “contain” and “matches” indicates in the regular expression?
In the regular expression, contains indicates that the regular expression matched at least some part of the target. While matches mean the regular expression matched the whole target. So, ‘alphabet’ is “matched” by ‘al.*t.’
11) Explain what is the configuration elements?
A configuration element works parallel with a Sampler. To set up defaults and variables for later use by samplers configuration elements can be used. At the start of the scope, these elements are processed before any samplers in the same scope.
12) Explain what is a timer in JMeter and what are the types of it?
A JMeter thread by default will send requests continuously without any pause. To get a pause between the request, Timers are used. Some of the Timers used are Constant Timer, Gaussian Random Timer, Synchronizing Timer, Uniform Random Timer and so on.
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13) Explain what is Test Fragment?
Test fragment is also a type of element like Thread Group element. The only difference is test fragment is not implemented unless it is referenced by either a Module controller or an Include controller.
14) Explain what is Assertion in JMeter? What are the types of assertion?
Assertion helps to verify that your server under test returns the expected results
Some commonly used Assertion in JMeter are
- Response Assertion
- Duration Assertion
- Size Assertion
- XML Assertion
- HTML Assertion
15) Explain how you can reduce the resource requirement in JMeter?
To reduce the resource requirements in JMeter
- Use non-GUI mode: jmeter –n –t test.jmx –l test.jtl
- During the load, a test doesn’t use “view results tree” or “view results in table” listeners, use them only during the scripting phase
- Don’t use functional mode
- Instead of using lots of similar samplers, use the same sampler in a loop and use the variable to vary the sample
16) Explain how you can perform spike testing in JMeter?
By synchronizing, timer JMeter spike Testing can be achieved. Synchronizing timer blocks thread until a specific amount of threads has been blocked and then release them all together thus creating large instantaneous load.
17) Explain how you can capture the script of the authentication window in JMeter?
Normally, you can capture script by recording.
- First, you have to Threadgroup in Testplan and then make HTTPProxyServer in Workbench
- After that, set port number in the Global Setting box (e.g., 8911) and modify your connection setting in IE as localhost in address 8911 as in port Then you can start http proxy server in JMeter and run your application for login
18) List out few JMeter Listeners?
Some of the JMeter Listeners are
- Spline Visualizer
- Aggregate Report
- View Result Tree
- View Result in Table
- Monitor Results
- Distribution Graph
- BeanShell Listener
- Summary Report and so on
19) What is distributed load testing? How can it be achieved?
Distributed load testing is the process through which numerous systems can be used for simulating a load of a large number of users. By using the master-slave configuration, JMeter can do distribute load testing.
20) In JMeter is it necessary to call embedded resources explicitly?
You can eliminate all embedded resources from being explicitly called. Requests have a checkbox at the bottom that says “retrieve embedded resources.” It would grab all CSS, JPG, etc. It is a brilliant way to find resources and broken link in a web App.
21) Explain what is the role of Timer in JMeter?
With the help of a timer, JMeter can delay the time between each request, which a thread makes. It can solve the overload problem of the server.
22) Explain what is Post-processor?
To perform any action after making a request, Post-processor is used. For example, if JMeter sends an HTTP request to the web server, and if you want JMeter to stop sending the request if the web server shows an error, then you will use post-processor to perform this action.
23) What are the benefits that JMeter offers for performance testing?
JMeter offers benefits on Performance Testing like
- It can be used to test performance for both, static resources as well as dynamic resources
- It can handle a maximum number of concurrent users then your website can handle
- It provides the graphical analyses of performance reports
Operating system Support for JMeter
JMeter is a pure Java application and should run correctly on any system that has a compatible Java implementation.
Here is the list of an operating system compatible with JMeter
- Linux
- Windows
- Mac OS
- Ubuntu
In this tutorial, you will learn -
Steps to Install JMeter
Step 1) Install Java
Because JMeter is pure Java desktop application, it requires a fully compliant JVM 6 or higher. You can download and install the latest version of Java SE Development Kit. Download Java Platform (JDK)
After installation is finished, you can use the following procedure to check whether Java JDK is installed successfully in your system
- In Window/Linux, go to Terminal
- Enter command java -version
If the Java runtime environment is installed successfully, you will see the output as the figure below
If nothing displays, please re-install Java SE runtime environment
Please see the link for details instructions https://www.guru99.com/install-java.html
Step 2) Download Jmeter
As of this writing, the latest version of JMeter is Apache JMeter 4.2. You can download it here But this tutorial demos installation of version 2.9, the install process remains the same.
Choose the Binaries file (either zip or tgz) to download as shown in the figure below
Step 3) Installation
Installation of JMeter is extremely easy and simple. You simply unzip the zip/tar file into the directory where you want JMeter to be installed. There is no tedious installation screen to deal with! Simply unzip and you are done!
Once the unzipping is done installation directory structure should look like as figure below
Given below is the description of the JMeter directories and its importance JMeter directory contains many files and directory
- /bin: Contains JMeter script file for starting JMeter
- /docs: JMeter documentation files
- /extras: ant related extra files
- /lib/: Contains the required Java library for JMeter
- /lib/ext: contains the core jar files for JMeter and the protocols
- /lib/junit: Junit library used for JMeter
- /printable_docs:
Step 4) Launch JMeter
You can start JMeter in 3 modes
- GUI Mode
- Server Mode
- Command Line Mode
Start JMeter in GUI Mode
If you are using Window, just run the file /bin/jmeter.bat to start JMeter in GUI mode as shown below
The following figure annotates the various components in the JMeter GUI
How to run JMeter in Non-GUI Mode
Start JMeter in Server Mode
Server mode is used for distributed testing. This Testing works as a client-server model. In this model, JMeter runs on a server computer in server mode. On a client computer, JMeter runs in GUI mode.
To start the server mode, you run the bat file binjmeter-server.bat as below figure
Start JMeter in command line mode
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JMeter in GUI mode consumes much computer memory. For saving the resource, you may choose to run JMeter without the GUI. To do so, use the following command options
This is a command line example
Additional Packages
Based on your requirement, you will need one or more optional packages listed below.
- Java Compiler
Java Compiler allows developers to build JMeter source code and other JMeter plugins
- SAX XML parser
SAX is the Simple API for XML, originally a Java-only API. You can use SAX XML parser as an alternative to XML parser in JMeter
- Email Support
JMeter has extensive Email capabilities. It can send email based on test results and has a POP3(S)/IMAP(S) sampler. It also has an SMTP sampler.
- JDBC driver
If you want to test database server, you have to install JDBC driver
Use JMeter in Linux
- Using JMeter in Linux is the same as in Window; you simply run the following shell script.
- Run the script file jmeter (This file has no extension)- run JMeter (in GUI mode by default).
- Run the script file jmeter-server - start JMeter in server mode (calls JMeter script with appropriate parameters)
- jmeter.sh - very basic JMeter script with no JVM options specified.
- mirror-server.sh - runs the JMeter Mirror Server in non-GUI mode
- shutdown.sh - Run the Shutdown client to stop a non-GUI instance gracefully
- stoptest.sh - Run the Shutdown client to stop a non-GUI instance abruptly