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DESCRIPTION Good programmers frequently try to optimize every line of code and speculate in the name of performance, without considering which code/design elements are actually performance problems. MOST FREQUENT SCALE Application REFACTORED SOLUTION NAME Performance test automation REFACTORED SOLUTION TYPE Process, technology REFACTORED SOLUTION DESCRIPTION Use the simplest code/design that will work. Establish concrete criteria and run automated performance tests against the criteria to establish the need for performance tuning. Tune only problem areas. Write well-factored and modular code that s easy to tune later, if necessary. ANECDOTAL EVIDENCE It works fine, but I suspected future performance problems so I spent the afternoon making it fast. All of my code is a little tough to read, but it s very fast. That design/technology is going to be too slow. SYMPTOMS, CONSEQUENCES Fewer development cycles are left for customer requirements or meaningful optimization when unforeseen problems arise. Design and code becomes unnecessarily complex and difficult to maintain. Functionality breaks when it s tweaked to be faster.

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'Set the site title to the customer name in the customers table, and provide a 'custom message that includes the contact information for this customer. Dim da As New SqlDataAdapter(String.Format("select * from customers where " &_ "CustomerId='{0}'", strCustomerID), strNorthwindConnectionString) Dim ds As New DataSet Dim dr As DataRow da.Fill(ds) dr = ds.Tables(0).Rows(0) strSiteTitle = dr("CompanyName") strWelcomeMsg = String.Format( _ "<br/>Welcome <strong>{0}</strong>. The contact " & _ "information we have on record for you " & _ "is:<br/><br/><strong>{1}</strong><br/>{2}<br/>{3}, {4} {5}" &_ <br/>{6}<br/>{7}", _ dr("ContactName"), dr("ContactTitle"), dr("Address"), _ dr("City"), dr("Region"), dr("PostalCode"), _ dr("Country"), dr("Phone")) 'Don't let a SQL failure spoil our day. Catch ex As Exception Console.WriteLine("Error: one or more parameters were incorrect.") Console.WriteLine() Console.WriteLine("Syntax:") Console.WriteLine() Console.WriteLine("CREATESITES <customerid> <site description>") Console.WriteLine() Exit Sub End Try

DESCRIPTION Attempting to bolt performance on to an application at the end of the development cycle rather than bake it in from the beginning MOST FREQUENT SCALE Application REFACTORED SOLUTION NAME Continuous performance planning REFACTORED SOLUTION TYPE Process REFACTORED SOLUTION DESCRIPTION Gather performance requirements early and often. Build automated performance tests that continuously validate performance criteria. Performance tests help to define exactly which areas do not meet criteria to focus testing efforts. Make any necessary course corrections throughout the project based on quantifiable measurements. TYPICAL CAUSES Poor planning ANECDOTAL EVIDENCE We will have plenty of time to performance tune at the end of the development cycle. It s a good design. We do not need to tune for performance. We ll let our QA department measure performance. We re using Enterprise JavaBeans, so it should scale well. SYMPTOMS, CONSEQUENCES Repeated delivery of poorly performing software, redesign of critical use cases late in the development cycle, and last-minute tuning activities that are ineffective

DESCRIPTION Performance tuning is difficult without a solid baseline or when multiple configuration parameters are changed at once between measurements. Attempting performance tuning in these conditions makes it difficult to gauge progress and correct problems, lengthening the overall cycle time and giving the appearance of thrashing. MOST FREQUENT SCALE Application REFACTORED SOLUTION NAME Good performance methodology REFACTORED SOLUTION TYPE Process REFACTORED SOLUTION DESCRIPTION A sound performance testing methodology and a good testing environment are the primary keys. Baseline measurements are mandatory to gauge progress. All tests should start from a common configuration and changes should be made one at a time. Focus on performance problems demonstrated by failed tests. ROOT CAUSES Haste, inadequate performance testing tools ANECDOTAL EVIDENCE It feels faster, don t you think When are we done tuning What did we change to make it slower SYMPTOMS, CONSEQUENCES Inefficient performance testing and tuning, longer than expected performance tuning cycles, and unclear results of performance improvements

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