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Consider the performance consequences of your API design decisions Making a public type mutable may require a lot of needless defensive copying (Item 24) Similarly, using inheritance in a public class where composition would have been appropriate ties the class forever to its superclass, which can place artificial limits on the performance of the subclass (Item 14) As a final example, using an implementation type rather than an interface in an API ties you to a specific implementation, even though faster implementations may be written in the future (Item 34) The effects of API design on performance are very real Consider the getSize method in the javaawtComponent class The decision that this performance-critical method was to return a Dimension instance, coupled with the decision that Dimension instances are mutable, forces any implementation of this method to allocate a new Dimension instance on every invocation Even though, as of release 13, allocating small objects is relatively inexpensive, allocating millions of objects needlessly can do real harm to performance In this case, several alternatives existed Ideally, Dimension should have been immutable (Item 13); alternatively, the getSize method could have been replaced by two methods returning the individual primitive components of a Dimension object In act, two such methods were added to the Component API in the 12 release for performance reasons Preexisting client code, however, still uses the getSize method and still suffers the performance consequences of the original API design decisions Luckily, it is generally the case that good API design is consistent with good performance It is a very bad idea to warp an API to achieve good performance The performance issue that caused you to warp the API may go away in a future release of the platform or other underlying software, but the warped API and the support headaches that it causes will be with you for life Once you've carefully designed your program and produced a clear, concise, and wellstructured implementation, then it may be time to consider optimization, assuming you're not already satisfied with the performance of the program Recall that Jackson's two rules of optimization were Don't do it, and (for experts only) Don't do it yet He could have added one more: Measure performance before and after each attempted optimization You may be surprised by what you find Often attempted optimizations have no measurable effect on performance; sometimes they make it worse The main reason is that it's difficult to guess where your program is spending its time The part of the program that you think is slow may not be at fault, in which case you'd be wasting your time trying to optimize it Common wisdom reveals that programs spend 80 percent of their time in 20 percent of their code Profiling tools can help you decide where to focus your optimization efforts Such tools give you run-time information such as roughly how much time each method is consuming and how many times it is invoked In addition to focusing your tuning efforts, this can alert you to the need for algorithmic changes If a quadratic (or worse) algorithm lurks inside your program, no amount of tuning will fix the problem You must replace the algorithm with one that's more efficient The more code in the system, the more important it is to use a profiler It's like looking for a needle in a haystack: The bigger the haystack, the more useful it is to have a metal detector The Java 2 SDK comes with a simple profiler, and several more sophisticated profiling tools are available commercially.

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Program 12-4, while typical of the way in which TLS and DllMain are combined to create thread-safe libraries, has a weakness that is noted in the comments in the previous section In particular, the "state" is associated with the thread rather than with the socket, so a given thread can process only one socket at a time An effective alternative approach to thread-safe library functions is to create a handle-like structure that is passed to every function call The state is then maintained in the structure Many UNIX systems use this technique to create thread-safe C libraries; the main disadvantage is that the functions require an additional parameter for the state structure Program 12-5 modifies Program 12-4 Notice that DllMain is not necessary, but there are two new functions to initialize and free the state structure The send and receive functions require only minimal changes An associated server, serverSKHA, is included on the book's Web site and requires nly slight changes in order to create and close the socket handle (HA denotes "handle").Program 12-5 SendReceiveSKHA: Thread-Safe DLL with a tate Structure . Encode Barcode In .NET Framework Using Barcode generator for ASP .Related: QR Code Generator Java Size, Print QR Code Word , QR Code Generation .NET Data

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The logical key of the fact table is comprised of all the foreign keys from the dimension tables included n that fact group For the Call Center fact table (refer to Figure 7-27), the logical key is comprised of the Date Key, Time Key, Customer Key, Employee Key, Call Transaction Key, and Call Outcome Key In general, there is no need to create a separate surrogate key for the fact table This would not be used for processing queries. Printing EAN128 In Visual Studio .NET Using Barcode printer for ASP.NET Control .Related: UPC-E Generation .NET WinForms , QR Code Generator Excel , EAN-13 Generating Excel

Figure 13.25 The TestAccess.dll file has access to he c:\xml folder. in .NET Generation qrcode in .NET Figure 13.25 The TestAccess.dll file has access to the c:\xml folder. Barcode scanner in .net Using Barcode scanner for .net .In this lab, you add Forms authentication to the Customers Web site. ou create a simple list of users, which are placed in the Web.config file. After Forms authentication is added, you test the application by trying to view the CustomerList.aspx page, which is only available to users who are logged into the Web site. Adding the Login Page In this section, you add a new Web page called login.aspx. 1. To start this lab, open the OrderEntrySystemSolution from Lab 12.1. 2. Right-click the OrderEntrySystemSolution in the Solution Explorer, and click Check Out. 3. Add a new Web Form, called login.aspx, to the Customers site. 4. Add a TextBox for the username and another TextBox for the password. 5. Add a CheckBox that the user can select to have the application remember the login credentials. 6. Add a logon Button and a Label for any message that is to be displayed. 7. Your login page should look like the one that is shown in Figure 13.16.Related: Excel QR Code Generator Image, QR Code Generator Word Size, Print QR Code .NET

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51 Design and carry out experiments to evaluate the performance gains from the HEAP_NO_SERIALIZE flag with HeapCreate and HeapAlloc How are the gains affected by the heap size and by the block size Are there differences under different Windows versions The book's Web site contains a program, HeapNoSrc, to help you get started on this exercise and the next one Modify the test in the preceding exercise to determine whether malloc generates exceptions or returns a null pointer when there is no memory Is this the correct behavior Also compare malloc performance with the results from the preceding exercise Windows versions differ significantly in terms of the overhead memory in a heap, especially when using obsolete Windows 9x versions Design and carry out an experiment to measure how many fixed-size blocks each system will give in a single heap Using SEH to detect when all blocks have been allocated makes the program easier A test program, clearc, on the Web site will show this behavior if the explicit OS test in the code is ignored This program, incidentally, is used in some of the timing tests to assure that data from a previous test run is not still in memory Modify sortFL (Program 5-4) to create sortHP, which allocates a memory buffer large enough to hold the file, and read the file into that buffer There is no memory mapping Compare the performance of the two programs Program 5-5 exploits the _based pointers that are specific to Microsoft C If you have a compiler that does not support this feature (or simply for the exercise), reimplement Program 5-5 with a macro, arrays, or some other mechanism to generate the based pointer values Write a search program that will find a record with a specified key in a file that has been indexed by Program 5-5 The C library bsearch function would be convenient here Implement the tail program from 3 with memory mapping Put the ReportError, PrintStrings, PrintMsg, and ConsolePrompt utility functions into a DLL and rebuild some of the earlier programs Do the same with Options and GetArgs, the command line option and argument processing functions It is important that both the utility DLL and the calling program also use the C library in DLL form Within Visual C++ and Visual Studio 60, for instance, select, from the title bar, Project Settings C/C++ tab Category (Code Generation) Use Run-Time Library (Multithreaded DLL) Note that DLLs must, in general, be multithreaded because they will be used by threads from several processes See the Utilities_3_0 project on the Web site for a olution Modify Program 5-7 so that the decision as to which DLL to use is based on the file size and system configuration The LIB file is not required, so figure out how to suppress LIB file generation Use GetVolumeInformation to determine the file system type.

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fails Schiesser [6] solved this problem by deriving a second-derivative operator for computing uxx in one step, but boundary-condition setting becomes more complicated For problems with more than one space dimension, the vector ompiler produces ordinary differential equations just as easily, for one can treat, for example, two-dimensional arrays as equivalent vectors (Section 3-11) But assignment of multidimensional boundary values is likely to be cumbersome, just as it would be in a Fortran program An intelligent choice of the coordinate system can simplify model and program, as in the example of Figure 7-12. for computer simulation of a simple heat exchanger. . Using Barcode printer for ASP.NET Control to generate .Related: Excel Code 128 Generation , UPC-E Generation VB.NET , EAN-13 Generating .NET

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