Apache JMeter

By Lamiya Qasim

Apache JMeter• Tool for load test functional behavior and measure

performance.

• Questions:

• Does JMeter offers support for each step of load test process?

• Can we create our own elements?

• How we could enhance JMeter?

Load test Process

• System Analysis

• Creating Virtual User Scripts

• Defining User Behavior

• Creating a Load Test Scenario

• Running Load Test Scenario

• Analyzing Results

System Analysis

• Enable customers to convert their goals and requirements into a successful test script.

• you can:

-Create your own test Script consistently

- Careful UI design allows you to create your own test Easily

Creating Virtual User Scripts

- Tester must emulates the real user by driving the real application as a client. - JMeter support this by adding thread group element, this tell JMeter:- the number of users you want to simulate, - how often the users send requests - how many requests they send.- What request (FTP Request, HTTP Request, and JDBC request). - validate that your application is returning the results you expect.

Defining User Behavior

• JMeter allows you to simulate human actions more closely

- By controlling how long JMeter engine delays between each sample

- So, you can define the way that the script runs

Creating a Load Test Scenario 

JMeter offers support for this step by:

•  Assign scripts to individual virtual user

• Tester can define any number of virtual users needed to run the tests

•  Allows user to simulate concurrent connections to server application.By enables user to create multiple threads ( virtual user) executing different test plan.

• Increasing the number of virtual users inIncreasing the number of virtual users in a controlled a controlled fashion.fashion.

Running Load Test Scenario

• With JMeter you can run your tests in a very easy way

Analyzing Results

JMeter offers support for this step by:

• displaying the data visually (Graph Results) .

• save data in file.

• allows user to see one multiple views of the data

• displays the response from the server.

• shows the URL of each sample taken .

• listeners will show different sets of data.

• it can send email based on test results.

Analyzing Results

• Showing detailed performance results that can be easily understood and analyzed to quickly pinpoint the root cause of problems.

Extending JMeter

• Creating your own Timer.

• Creating your own SampleListener (such as visualizer or reporter).

• Creating your own Config Element.

• Creating your own logic SamplerController.

• Creating your own test sample SamplerController.

• Making your custom elements play nice as a JMeter UI component .

• Making your custom elements saveable and loadable from within JMeter.

Create your own Timer Element

• By default, a JMeter thread sends requests without pausing

between each request. • JMeter could overwhelm the server by making too many

requests in a very short amount of time.

• Timer will cause JMeter to delay a certain amount of time between each request that a thread makes.

Create your own Timer Element

• Timers provide a framework for delaying in between

samples. And contain these methods: - delay() wait for a Timer specific amount of time

JMeter calls this function prior to every sample. The Timer should wait for a period of time and then return.

-set() prepare for sampling

JMeter calls this function prior to the begining of a test

session. The timer should initialize itself, read any values from its UI and prepare for operation.

How we could Enhance JMeter?

- Allows user to modify a Load Test Scenario while JMeter runs.

for Example, add new test sample , new threads,etc.

- Start and stop thread groups individually.

- Add new Functions in the GUI like Cut, Copy, Paste and Insert for manipulating test elements.

- Includes all documentation for all the elements in it’s application, rather than searching the web site.

How we could Enhance JMeter? cont

- generate report act as accuracy report to verify the actual values in the database.

- allow users to move different test elements around the test configuration tree easily.

- adding indicator to indicate, if the user could run the a test or not for some reason.

- Maintaining the test by build reusable tests to use throughout the application’s lifecycle.

Conclusion

• JMeter offers support for each segment of the load test process.

• You can create your own different elements.

• But still JMeter needs some kind of enhancements.

Where To Find JMeter

• http://jakarta.apache.org