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Enable compiler optimizations One zero-cost change that usually produces a reasonable improvement is to turn on whatever optimization the compiler provides Modem compilers do sufficiently well that they obviate much of the need for small-scale changes by programmers By default, most C and C++ compilers do not attempt much optimization A compiler option enables the optimizer ("improver" would be a more accurate term) It should probably be the default except that the optimizations tend to confuse sourcelevel debuggers, so programmers must enable the optimizer explicitly once they believe the program has been debugged Compiler optimization usually improves run-time anywhere from a few percent to a factor of two Sometimes, though, it slows the program down, so measure the improvement before shipping your product We compared unoptimized and optimized compilation on a couple of versions of the spam filter For the test suite using the final version of the matching algorithm, the original run-time was 81 seconds, which dropped to 59 seconds when optimization was enabled, an improvement of over 25% On the other hand, the version that used the fixed-up s t r s t r showed no improvement under optimization, because s t r s t r had already been optimized when it was installed in the library; the optimizer applies only to the source code being compiled now and not to the system libraries However, some compilers have global optim i z e r ~which analyze the entire program for potential improvements If such a com, piler is available on your system, try it; it might squeeze out a few more cycles One thing to be aware of is that the more aggressively the compiler optimizes, the more likely it is to introduce bugs into the compiled program After enabling the optimizer, re-run your regression test suite as you should for any other modification Tune the code The right choice of algorithm matters if data sizes are big enough Furthermore, algorithmic improvements work across different machines, compilers and languages But once the right algorithm is in place, if speed is still an issue the next thing to try is tuning the code: adjusting the details of loops and expressions to make things go faster The version of isspam we showed at the end of Section 71 hadn 39;t been tuned Here, we'll show what further improvements can be achieved by tweaking the loop As a reminder, this is how we left it:.

Supplement 5 Drawer In Java Using Barcode maker for Java . In Visual Studio .NET Using Barcode decoder for .There are two threads, a producer and a consumer, that act entirely asynchronously The producer periodically creates messages containing a table of numbers, such as current stock prices, periodically updating the table The consumer, on request from the user, displays the current data The requirement is that the displayed data must be the most recent complete set of data, but no data should be displayed twice Do not display data while the producer is updating it, and do not display old data Note that many produced messages are never used and are "lost" This example is a special case of the pipeline model in which data moves from one thread to the next [1] of the data in the table, As an integrity check, the producer also computes a simple checksum and the onsumer validates the checksum to ensure that the data has not been corrupted in transmission from one thread to the next If the consumer accesses the table while it is still being updated, the table will be invalid; the CS ensures that this does not happen The message block invariant is that the checksum is correct for the current message contents This checksum, an "exclusive or" of the message bits, is for illustration only Much more sophisticated message digest techniques are available and should be used in a production application.Related: Generate EAN-13 C# , Printing Codabar Java , UPC-E Creating Java

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see that it points somewhere into NTDLL s header (the specific value is likely to change with each new update of the operating system). aking a quick look at the NTDLL headers using DUMPBIN shows you that the address in EAX is the beginning of NTDLL s export directory. Going to the structure definition for IMAGE_EXPORT_DIRECTORY, you will find that offset +18 is the Number OfFunctions member. Here s the final preparation of the block size:. The function proceeds into another iteration of the NTDLL export list, again computing that strange checksum for each unction name. In this loop there are two interesting lines that write into the newly allocated memory block:. Barcode barcode library with .net Using Barcode reader for .Related: Data Matrix Generator Java , Creating EAN-8 VB.NET , Intelligent Mail Generator C#

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How could this be made faster The string must be searched, and the s t r s t r function from the C library is the best way to search: it's standard and efficient Using proflirzg, a technique we'll talk about in the next section, it became lear that the implementation of s t r s t r had unfortunate properties when used in a spam filter By changing the way s t r s t r worked, it could be made more efficient for this particular problem The existing implementation of s t r s t r looked something like this:.

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advance (though not to strncmp), this complexity is unnecessary; we know the counts are right so checking for the \O wastes time Third, s t r c h r is also complex, since it must look for the character and also watch for the \O byte that terminates the message For a given call to isspam, the message is fixed, so time spent looking for the \O is wasted since we know where the message ends Finally, although strncmp, s t r c h r , and s t r l e n are all efficient in isolation, the overhead of calling these functions is comparable to the cost of the calculation they will perform It's more efficient to do all the work in a special, carefully written version of s t r s t r and avoid calling other functions altogether These sorts of problems are a common source of performance trouble-a routine or interface works well for the typical case, but performs poorly in an unusual case that happens to be central to the program at issue The existing s t r s t r was fine when both the pattern and the string were short and changed each call, but when the string is long and fixed, the overhead is prohibitive With this in mind, s t r s t r was rewritten to walk the pattern and message strings together looking for matches, without calling subroutines The resulting implementation has predictable behavior: it is slightly slower in some cases, but much faster in the spam filter and, most important, is never terrible To verify the new implementation's correctness and performance, a performance test suite was built This suite included not nly simple examples like searching for a word in a sentence, but also pathological cases such as looking for a pattern of a single x in a string of a thousand e's and a pattern of a thousand x's in a string of a single e, both of which can be handled badly by naive implementations Such extreme cases are a key part of performance evaluation The library was updated with the new s t r s t r and the sparn filter ran about 30% faster, a good payoff for rewriting a single routine Unfortunately, it was still too slow When solving problems, it's important to ask the right question Up to now, we've been asking for the fastest way to search for a textual pattern in a string But the real problem is to search for a large, fixed set of textual patterns in a long, variable string Put that way, s t r s t r is not so obviously the right solution The most effective way to make a program faster is to use a better algorithm With a clearer idea of the problem, it's time to think about what algorithm would work best The basic loop, f o r ( i = 0 ; i < npat; i++) i f (strstr(mesg, p a t [ i ] ) != NULL) return 1; scans down the message npat independent times; assuming it doesn't find any matches, it examines each byte of the message npat times, for a total of s t r l en (mesg) m p a t comparisons.

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Bar Code Maker In Visual Studio .NET Using Barcode creation . ASP.NET Control to generate, create barcode image in .Integration testing takes a step up from isolated test cases to concentrate on the interactions between two or more components The preferred strategy for integration testing is usually an incremental strategy In this way the interaction between two or a few components is tested first and additional components are added to the test mix after the current components under test have been proven to function correctly The incremental test strategy is in contrast to the big bang test strategy where all the components are tested together at once [Abran2004] JUnit supports testing stand-alone Java classes very well When creating tests for Java EE 5 applications you have the added difficulty of ensuring that your code functions properly when run inside of a servlet or Java EE 5 container (In this section, when we efer to a servlet container we mean either a servlet or a Java EE 5 container) For example, you will have difficulty creating a JUnit test for.Related: Print EAN-13 .NET , C# Data Matrix Generation , Codabar Generation ASP.NET

EAN-13, also known as European Article Number 13, EAN-13 Supplement 5/Five-digit Add-On, EAN-13 Supplement 2/Two-digit Add-On, EAN-13+5, EAN-13+2, EAN13, EAN13+5, EAN13+2, UPC-13, GTIN-13, GS1-13, EAN/UCC-13, is one member of the EAN/UPC barcode symbology family who is widely used in GS1 system of standards /div>. With EAN-13 Generator, users may display EAN-13 barcode check digit in accordance ith users' needs by enabling DisplayChecksum property.Related: Generate Barcode .NET Winforms , Generate Barcode SSRS .NET Winforms , Printing Barcode SSRS

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