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In the early days of Windows, many processes had maybe 5 or 6 DLLs loaded into them, but today, some processes have several hundred DLLs loaded into them Right now, on my machine, Microsoft Office Outlook has about 250 DLLs loaded into its process address space! This means that whenever a new thread is created in Office Outlook, 250 DLL functions must get called before the thread is allowed to do what it was created to do And these 250 functions must be called again whenever a thread in Outlook dies Wow this can seriously affect the performance of creating and destroying threads within a process 2 So now, you see all the space and time overhead that is associated with creating a thread, letting it sit around in the system, and destroying it But the situation gets even worse now we re going to start talking about context switching .

Data purists sometimes argue that programmers should never use global data, but most programs use global data when the term is broadly construed. Data in a

A computer with only one CPU in it can do only one thing at a time Therefore, Windows has to share the actual CPU hardware among all the threads (logical CPUs) that are sitting around in the system At any given moment in time, Windows assigns one thread to a CPU That thread is allowed to run for a time-slice (sometimes referred to as a quantum) When the time-slice expires, Windows context switches to another thread Every context switch requires that Windows performs the following actions: 1 Save the values in the CPU s registers to the currently running thread s context structure inside the thread s kernel object 2 Select one thread from the set of existing threads to schedule next .

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database is global data, as is data in configuration files such as the Windows registry. Named constants are global data, just not global variables. Used with discipline, global variables are useful in several situations:

If this thread is owned by another process, then Windows must also switch the virtual address space seen by the CPU before it starts executing any code or touching any data 3 Load the values in the selected thread s context structure into the CPU s registers After the context switch is complete, the CPU executes the selected thread until its time-slice expires, and then another context switch happens again Windows performs context switches about every 30 ms Context switches are pure overhead; that is, there is no memory or performance benefit that comes from context switches Windows performs context switching to provide end users with a robust and responsive operating system ..

You can also decide what checkout mode you want to use (see figure 4.18). You can do this on the TeamCity server, on the build agent, or not at all if your build script will pull the changes for itself. SVN lets you check out the files on the agent, so do it; this will reduce the load on the main TeamCity server. You can decide where to check out the files or leave it blank for TeamCity to decide. The build folder can be automatically purged before every build

DLLs produced by C# and most other managed programming languages do not have a DllMain in them at all and so managed DLLs will not receive the DLL_THREAD_ATTACH and DLL_THREAD_DETACH notifications improving performance . In addition, unmanaged DLLs can opt out of these notifications by calling the Win32 DisableThreadLibraryCalls function . Unfortunately, many unmanaged developers are not aware of this function, so they don t call it .

Preservation of global values Sometimes you have data that applies conceptually to your whole program This might be a variable that reflects the state of a program for example, interactive vs command-line mode, or normal vs error-recovery mode Or it might be information that s needed throughout a program for example, a data table that every routine in the program uses Emulation of named constants Although C++, Java, Visual Basic, and most modern languages support named constants, some languages such as Python, Perl, Awk, and Unix shell script still don t You can use global variables as substitutes for named constants when your language doesn t support them For example, you can replace the literal values 1 and 0 with the global variables TRUE and FALSE set to 1 and 0, or replace 66 as the number of lines per page with LINES_PER_PAGE = 66.