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Load testing verifies the system performance under the expected peak load.  The peak load needs to set by a series of parameters that you have benchmarked targets.  For example, these parameters could include:

Load testing:
  • 20,000 concurrent users; and
  • response time of under 4 seconds
Stress testing:
  • Verifies the server performance under extreme load.  Test this through examining how many users are required to bring your server
Endurance testing:

Load test over an extended period of time

 

Check with your hosting provider

Before you begin to performance test - check with your hosting provider if their infrastructure allows for performance testing.  In some environments, hosting providers won't allow for performance testing even on dedicated server.

 

Action plan:

Step 1:
  • Complete your benchmarking documentation.  Unless you have something to target what is the point
  • Infrastructure monitoring and profiling to identify bottlenecks and potential failures
    • Out of resources (bandwidth, memory, CPU, database)
    • Configuration including server and code (such as Apache and PHP)
Step 2: Tool selection
  • Protocol
  • Browser
    • Load the full page - there including images, AJAX requests.  This is important if your site uses client side requests.  However, concurrency is limited
    • Open source tools - Selenium
Step 3: Script creation
  • Language type - javascript, python, etc
  • Scripts can be
    • Simple: visit home page, search page or content pages
    • Complex - Login as a user
Step 4: Monitor performance
  • Number of users.  Start low and ramp up.  For example, begin with 100 and ramp up to 5000.  If this is an initial test, then have lower presets.
  • Trace response time in real life.  Check how many users against time.
  • Look at the apache and memory performance
  • Check the logs