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