Web site templates - Stress testing is the next logical extension. Stress
Stress testing is the next logical extension. Stress testing is essentially load testing using peak loads. When conducting stress tests, you really are trying to stress the application to its limits to see how it reacts, how efficiently the memory is used, and what other types of problems will surface. Stressing your application under a heavy simulated load offers many benefits. In particular, stress testing allows you to: Identify bottlenecks in the application under a large user load before they occur in the production environment. Control risks and costs by predicting scalability and performance limits. Increase uptime and availability of the application through proper resource planning. Avoid missing go-live dates due to unexpected performance and scalability problems. Performance, load, and stress testing should be performed on an application to get the complete picture. They can point to parts of the application that might become bottlenecks, both under normal loads and as the number of users climbs. 17.3 Performance- and Stress-Testing Tools There is an abundant supply of performance- and stress-testing tools available on the market today. Some are quite inexpensive, while others are astronomically expensive. Commercial testing products tend to offer more plentiful features, but there’s really no correlation between cost and quality when it comes to these types of tools. For most applications, you don’t need to spend an arm and a leg on a testing tool when there are free or cheaper ones that will do the job. The best advice is to start out with one of the free or inexpensive tools and see if it meets the project’s needs. If not, take a look at one of the more expensive commercial products to see what it has to offer. Table 17-1 lists several performance- and stress-testing tools. Table 17-1. Available performance- and stress-testing tools Company Product URL Apache Group JMeter http://jakarta.apache.org/jmeter/ Mercury Interactive LoadRunner http://www-svca.mercuryinteractive.com Rational SiteLoad http://www.rational.com RadView WebLoad http://www.radview.com Empirix e-Test Suite http://www.empirix.com Segue Software, Inc. SilkPerformer http://www.segue.com Microsoft WAS http://webtool.rte.microsoft.com Apache Group Flood http://httpd.apache.org/test/flood/ SourceForge The Grinder http://grinder.sourceforge.net 17.4 Testing the Storefront Application The Storefront application represents a typical shopping-cart application that you might encounter on the Internet or may even have built before. A normal application of this type would connect to a database with tens of thousands or even hundreds of thousands of records.
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