barcode printing vb.net Part V in C#

Paint PDF417 in C# Part V

Part V
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Threading
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In addition, when performing a garbage collection, the CLR must suspend all the threads, walk their stacks to find the roots to mark objects in the heap, walk their stacks again (updating roots to objects that moved during compaction), and then resume all the threads . So avoiding threads will greatly improve the performance of the garbage collector, too . And whenever you are using a debugger, Windows suspends all threads in the application being debugged every time a breakpoint is hit and resumes all the threads when you single-step or run the application . So the more threads you have, the slower your debugging experience will be . From this discussion, you should conclude that you must avoid using threads as much as possible because they consume a lot of memory and they require time to create, destroy, and manage . Time is also wasted when Windows context switches between threads and when garbage collections occur . However, this discussion should also help you realize that threads must be used sometimes because they allow Windows to be robust and responsive . I should also point out that a computer with multiple CPUs in it can actually run multiple threads simultaneously, increasing scalability (the ability to do more work in less time) . Windows will assign one thread to each CPU core, and each core will perform its own context switching to other threads . Windows makes sure that a single thread is not scheduled on multiple cores at one time because this would wreak havoc . Today, computers that contain multiple CPUs, hyperthreaded CPUs, or multi-core CPUs are commonplace . But when Windows was originally designed, single-CPU computers were commonplace, and Windows added threads to improve system responsiveness and reliability . Today, threads are also being used to improve scalability, which can happen only on computers that have multiple cores in them . The remaining chapters in this book discuss the various Windows and CLR mechanisms that exist so that you can effectively wrestle with the tension of creating as few threads as possible while still keeping your code responsive and allowing it to scale if your code is running on a machine with multiple cores .
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Stop the Madness
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If all we cared about was raw performance, then the optimum number of threads to have on any machine is identical to the number of CPUs on that machine . So a machine with one CPU would have only one thread, a machine with two CPUs would have two threads, and so on . The reason is obvious: If you have more threads than CPUs, then context switching is introduced and performance deteriorates . If each CPU has just one thread, then no context switching exists and the threads run at full speed .
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25 Thread Basics
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However, Microsoft designed Windows to favor reliability and responsiveness as opposed to favoring raw speed and performance . And I commend this decision: I don t think any of us would be using Windows or the .NET Framework today if applications could still stop the OS and other applications . Therefore, Windows gives each process its own thread for improved system reliability and responsiveness . On my machine, for example, when I run Task Manager and select the Performance tab, I see the image shown in Figure 25-1 .
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FIguRE 25-1 Task Manager showing system performance
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It shows that my machine currently has 60 processes running on it, and so we d expect that there were at least 60 threads on my machine since each process gets at least 1 thread . But Task Manager also shows that my machine currently has 829 threads in it! This means that there is about 829 MB of memory allocated for just the thread stacks, and my machine has only 2 GB of RAM in it . This also means that there is an average of approximately 13 .8 threads per process . Now, look at the CPU Usage reading: It shows that my CPU is busy 0 percent of the time . This means that 100 percent of the time, these 829 threads have literally nothing to do they are just soaking up memory that is definitely not being used when the threads are not running . You have to ask yourself: Do these applications need all these threads to do nothing 100 percent of the time The answer to this question has to be No . Now, if you want to see which processes are the most wasteful, click the Processes tab, add the Threads column,3 and sort this column in descending order, as shown in Figure 25-2 .
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Printing UPCA In None
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