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Practical Service Level Management: Delivering High-Quality Web-Based Services by Eric Siegel, John McConnell

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The Performance Envelope

Load testing is used to identify a performance envelope for a service or a mix of services under different operating conditions. The performance envelope represents the service's performance under normal and extreme operational ranges. For example, you probably first want to test services at their expected normal operating loads (number of users or transactions per second) over an extended time period to ensure reliable and stable operation. Then you'll want to test under extreme loads to determine the operational limitations, which should assist in pointing to actions that can reduce bottlenecks.

Determining an accurate performance envelope is notoriously difficult for several reasons. Web environments are complex, and ...

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