Tuesday, August 16, 2011

Why Scalability and Load Testing is Important?

Some very high profile websites have suffered from serious outages and/or performance issues due to the number of people hitting their website. E-commerce sites that spent heavily on advertising but not nearly enough on ensuring the quality or reliability of their service have ended up with poor web-site performance, system downtime and/or serious errors, with the predictable result that customers are being lost.

In the case of toysrus, its web site couldn't handle the approximately 1000 percent increase in traffic that their advertising campaign generated. Similarly, Encyclopaedia Britannica was unable to keep up with the amount of users during the immediate weeks following their promotion of free access to its online database. The truth is, these problems could probably have been prevented, had adequate load testing taken place.

When creating an e Commerce portal, companies will want to know whether their infrastructure can handle the predicted levels of traffic, to measure performance and verify stability.

These types of services include Scalability / Load / Stress testing, as well as Live Performance Monitoring.

Load testing tools can be used to test the system behavior and performance under stressful conditions by emulating thousands of virtual users. These virtual users stress the application even harder than real users would, while monitoring the behavior and response times of the different components. This enables companies to minimize test cycles and optimize performance, hence accelerating deployment, while providing a level of confidence in the system.

Once launched, the site can be regularly checked using Live Performance Monitoring tools to monitor site performance in real time, in order to detect and report any performance problems - before users can experience them.


  1. What are some tools you suggest to load test?

  2. These are the following tool used for Load testing and Performance testing
    Apploader-Load and Performance Testing
    IBM Rational Performance Tester-Eclipse based large scale performance testing tool mainly used for executing large volume performance test to measure system response time for server based applications.
    HP'S Load Runner
    Silk Performer
    Visual Studio Load Test
    SLAMD-oPEN SOURCE,100% Java Web application,scriptable
    JMeter-Java desktop application for load testing and Performance Measure

  3. Excellent point.

    The other virtue is that you can also feed your load-test data into this to validate it (how else do you know it's correct?) and project scalability beyond that which is configured for measurement.

  4. I would add SOASTA CloudTest Lite to the list of performance and load testing products.