BugRaptors use different types of tools for performance and load testing. One of the tools we use is JMeter to analyze the performance of web applications and Mobile apps with varying load. It is used to test performance both on static and dynamic resources such as static files, Java Servlets, ASP.NET, PHP, CGI scripts, Java objects, databases, FTP servers, and more.

1. INTRODUCTION TO JMETER & HOW TO
VIEW JMETER TEST RESULTS IN REAL-TIME

2. WHAT IS JMETER
The Apache JMeter is completely Java open source software. It was
first developed by Stefano Mazzocchi who was working for Apache
Software Foundation, designed to load test functional behavior and
measure performance. You can use JMeter to measure the
performance of variety of services or web applications. Performance
testing means testing a web application against concurrent &
multiple user traffic and heavy loads. JMeter originally used for
testing FTP application or Web Application. These days it is used for
database server test, functional test etc.

3. HOW DOES JMETER WORK
JMeter imitates a group of users. They will send requests to a
targeted server and return statistics information of target server
through graphical diagrams & tables.

4. ADVANTAGES OF JMETER
Some of the advantages of JMeter are as follows:
1. Open Source License: It is a free tool and it also helps developers
by allowing them to use the source code for the development.
2. Friendly GUI: User takes less time to get familiar with it and it is
really easy to use.
3. Platform Independent: JMeter is purely and completely a java
desktop application which can also run on multiple platforms.
4. Full Multi-threading Framework: It allows concurrent and
synchronized sampling of different functions by a different thread
group.
5. Visualize Test Results: Test results can be shown in different
formats like table, tree, chart and log file.

5. 6. Easy Installation: One of the advantages of JMeter is that there is
no need of installation. You just need to put JMeter source files in a
location on your machine and run jmeter.bat file from bin folder of
JMeter.
7. Highly Extensible: User can write his/her own tests. JMeter also
supports visualization plugins which allows user to extend his/her
testing.

6. 8. Multiple Testing Strategy: JMeter supports many testing
techniques like load testing, distributed testing and functional testing.
9. Simulation: JMeter can simulate multiple users with coexisting
threads and create a heavy load against web application under test.
10. Support Multiple Protocols: JMeter evaluates database server
performance and supports web application testing. Performance of all
basic protocols such as FTP, JMS, SOAP, LDAP, JDBC and HTTP
can be evaluated through it.
11. Record & Playback- Record the user movement on the browser
and imitate them in web application using JMeter.
12. Script Test: JMeter can be combined with Selenium & bean shell
for automated testing.

7. HOW TO VIEW JMETER TEST RESULTS
IN REAL-TIME
The customary way to use JMeter is in Non-GUI mode (CLI). By
running in CLI mode, users save resources and ensure their test
results are reliable. Using the JMeter, GUI is meant only for
development, debugging and test recording.

8. THE PROBLEM - JMETER LIMITS
VIEWING TEST RESULTS IN REAL-TIME
Though, running JMeter in CLI mode may bound users who want to
understand what is going on in their test in real-time, as CLI mode
stops incorporating listeners during the test run. Any listener you
used to have in your test plan were probably Graphical User Interface
mode specific and don’t send anything to non-GUI mode.
Nowadays, when users want to understand what is occurring in their
test, they have to wait for the test to finish running. Then they take
the sample.jtl file that their load test produced, open the JMeter GUI
and add their preferred listener to the test plan. They can then load
the sample.jtl file into the Listener and see the graph/reports.