JMeter Introduction

In this post, I will share a brief and concise JMeter Introduction for you. I hope you will enjoy reading this post to get information about the fundamentals of JMeter.

JMeter Introduction – What is JMeter?

Apache JMeter is an Apache project that can be used as a load testing tool for analyzing and measuring the performance of a variety of services, with a focus on web applications. JMeter can be used as a unit test tool for JDBC database connections, FTP, LDAP, Web services, JMS, HTTP, generic TCP connections, and OS Native processes.

JMeter can also be configured as a monitor, although this is typically considered an Adhoc solution instead of the advanced monitoring solution. It can be used for some functional testing as well. JMeter supports variable parametrization, assertions (response validation), per-thread cookies, configuration variables, and a variety of reports. JMeter architecture is based on plugins. Most of its “out of the box” features are implemented with plugins. Off-site developers can easily extend JMeter with custom plugins.  (ref: Wikipedia.org)

Jmeter Features

• JMeter %100 pure java, open-source application
• Designed for Load/ Performance/ Stress Testing
• You can write your own script
• Simulate heavy loads
• Visual feedback
• Distributed Testing
• Support different protocols, HTTP, Ftp, Ldap, Soap
• Multi-platform support
• Multithreading
• Caching & Offline Analysis

General Flow

Test Plans consist of:

• Thread Groups
• Samplers
• Logical Controllers
• Listeners
• Timers
• Assertions
• Configuration Elements
• Pre- processors
• Postprocessors

JMeter Modes

1- GUI Mode

2- Server Mode

3- Command Line Mode

1- GUI Mode: After download and extract it, you can find it inside this path: “/bin/jmeter.bat”

2- Server Mode: Server Mode is used for distributed testing, use the client-server model.

3- Command Line Mode(non-GUI mode): If you have limited memory don’t want GUI frozen, you can use this mode. Go to the bin folder of your JMeter installation from the command prompt, type the following command:

jmeter -n -t D:\TestScripts\script.jmx -l D:\TestScripts\scriptresults.jtl

-n [This specifies JMeter is to run in non-GUI mode]

-t  [name of JMX file that contains the Test Plan]

-l  [name of JTL file to log sample results to]

JMeter Directory Structure

JMeter automatically finds classes from jars in the following directories:

• JMETER_HOME/lib: used for utility jars
• JMETER_HOME/lib/ext: used for JMeter components and plugins

Folder structure

bin: contains the .bat and .sh files for starting Jmeter. It also contains ApacheJMeter.jar and properties file

docs: the directory contains the JMeter documentation files

extras: ant related extra files

lib – contains the required jar files for Jmeter

lib/ext: contains the core jar files for JMeter and the protocols

src: contains a subdirectory for each protocol and component

test: unit test related directory

xdoc: XML files for documentation. JMeter generates documentation from XML. 

Thanks.
Onur Yazir