Enterprise Library Test Guide - Willy .Net

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Testing for Performance and Scalability 169 Defining Performance Criteria The most common approach to determining an application’s performance is to measure its response times and the resources it uses against criteria, such as the application’s budgets for resources, its business needs, and its service level agreements. However, it is not always possible to use these criteria with Enterprise Library, treated as a whole. The reasons for this are: ● ● ● There is no single application that encompasses all the application blocks. Different applications require different resources. Different applications have different goals. Because the application blocks cannot be tested in the context of a specific application, another approach is to measure an application block’s performance goals against a baseline. This is the approach used with Enterprise Library. The baselines are the .NET Framework and Enterprise Library 1.1. In this case, an example of a performance goal may be that an Enterprise Library method should have less than a 15 percent overhead when compared to the overhead of the equivalent .NET Framework method. For example, the cost of adding an item to the ASP.NET cache serves as a baseline measurement for the Caching Application Block’s equivalent Add method. By comparing the two costs, the overhead of the Enterprise Library application block becomes apparent. Measurements of the performance criteria are collected with the Windows Performance Monitor (Perfmon.exe). Here is the complete list of performance criteria for Enterprise Library–January 2006: ● ● ● ● Overhead cost Initialization cost Consistency Availability The next sections discuss these subjects. Overhead Cost The overhead cost is expressed as a percentage. It is the difference between the response time of an application block (or one of its system resources) when it performs a function and the response time of the .NET Framework and Enterprise Library 1.1 when it performs the same function. The overhead cost is expressed as a percentage of total transactions (this is also termed “total hits” for Web applications) and as a percentage of transactions per second. The next sections describe the calculations for determining the overhead costs.
170 Enterprise Library Test Guide Total Transactions This section describes how to calculate the overhead cost in terms of percentage of total transactions. For Web applications, the term “total hits” is often used instead of “total transactions.” Overhead cost = ((Total transactions for .NET – Total transactions for application block)/Total transactions for .NET) * 100 Table 1 lists the data that was collected during a 7 minute performance test. The goal was to compare the cost of using the Caching Application Block in Enterprise Library–January 2006 to add an item to the cache against the ASP.NET and Enterprise Library 1.1 baselines. Table 1: Overhead of Using Caching Application Block Add Method Component TPS Time (sec) Overhead Total transactions ASP.NET 1844.215 0.048801 baseline 608591 Enterprise Library 1.1 (instrumentation off) 1692.394 0.053179 8.23% 558490 Enterprise Library 1.1 (instrumentation on) 1626.352 0.055339 11.81% 536696 Enterprise Library – January 2006 (instrumentation off) 1725.536 0.052158 6.44% 569427 Enterprise Library – January 2006 (instrumentation on) 1611.703 0.055842 12.61% 531862 The overhead of using the Enterprise Library–January 2006 Caching Application Block is calculated as follows: Total Transactions for ASP.NET = 608591 Total Transactions for Enterprise Library–January 2006 (instrumentation on) = 531862 Overhead = ((608591-531862)/608591*100) =12.61% Transactions per Second This section describes how to calculate the overhead cost in terms of percentage of transactions per second (TPS). Overhead cost = ((TPS for .NET – TPS for application block)/TPS for .NET) * 100
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iv Contents Testing the Logging App
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Enterprise Library Test Guide - Willy .Net

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