Apache JMeter

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Apache JMeter

• By Lamiya Qasim

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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?

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Load test Process

• System Analysis
• Creating Virtual User Scripts
• Defining User Behavior
• Creating a Load Test Scenario
• Running Load Test Scenario
• Analyzing Results

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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

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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.

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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

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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 in a
  controlled fashion.

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Running Load Test Scenario

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

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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.

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Analyzing Results

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

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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.

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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.

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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.
  

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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 its application, rather than searching the
  web site.

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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 applications lifecycle.

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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.

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Where To Find JMeter

• http//jakarta.apache.org