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As you can see here, Outlook has created 38 threads and is using 0 percent of the CPU, Microsoft Visual Studio (Devenv .exe) has created 34 threads to use 0 percent of the CPU, Windows Live Messenger (Msnmsgr .exe) has created 34 threads to use 0 percent of the CPU, and so on . What is going on here When developers were learning about Windows, they learned that a process in Windows is very, very expensive . Creating a process usually takes several seconds, a lot of memory must be allocated, this memory must be initialized, the EXE and DLL files have to load from disk, and so on . By comparison, creating a thread in Windows is very cheap, so developers decided to stop creating processes and start creating threads instead . So now we have lots of threads . But even though threads are cheaper than processes, they are still very expensive compared to most other system resources, so they should be used sparingly and appropriately . Well, without a doubt, we can say for sure that all of these applications we ve just discussed are using threads inefficiently . There is just no way that all of these threads need to exist in the system . It is one thing to allocate resources inside an application; it s quite another to allocate them and then not use them . This is just wasteful, and allocating all the memory for thread stacks means that there is less memory for more important data, such as a user s document .4
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I just can t resist sharing with you another demonstration of how bad this situation is . Try this: Open Notepad .exe and use Task Manager to see how many threads are in it . Then select Notepad s File Open menu item to display the common File Open dialog box . Once the dialog box appears, look at Task Manager to see how many new threads just got created . On my machine, 22 additional threads are created just by displaying this dialog box! In fact, every application that uses the common File Open or File Save dialog box will get many additional threads created inside it that sit idle most of the time . A lot of these threads aren t even destroyed when the dialog box is closed .
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To make matters worse, what if these were the processes running in a single user s Remote Desktop Services session and what if there were actually 100 users on this machine Then there would be 100 instances of Outlook, all creating 38 threads only to do nothing with them . That s 3,800 threads each with its own kernel object, TEB, user-mode stack, kernelmode stack, etc . That is a lot of wasted resources . This madness has to stop, especially if Microsoft wants to give users a good experience when running Windows on netbook computers, many of which have only 1 GB of RAM . Again, the chapters in this part of the book will describe how to properly design an application to use very few threads in an efficient manner . Now, I will admit that today, most threads in the system are created by native code . Therefore, the thread s user-mode stack is really just reserving address space and most likely, the stack is not fully committed to using storage . However, as more and more applications become managed or have managed components running inside them (which Outlook supports), then more and more stacks become fully committed, and they are allocating a full 1 MB of physical storage . Regardless, all threads still have a kernel object, kernel-mode stack, and other resources allocated to them . This trend of creating threads willy-nilly because they are cheap has to stop; threads are not cheap rather, they are expensive, so use them wisely .
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