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Now that you understand the basics, let s put it all into perspective Let s say that a client request comes in, and our server makes an asynchronous database request As a result, our thread won t block, and it will be allowed to return to the thread pool so that it can handle more incoming client requests So now we have just one thread handling all incoming client requests When the database server responds, its response is also queued into the thread pool, so our thread pool thread will just process it at some point and ultimately send the necessary data back to the client At this point, we have just one thread processing all client requests and all database responses .

1 . You use the ConnectionString attribute. 2. You use the TypeName attribute. 3. You use the ContextTypeName attribute. 4. You use the EntitySetName attribute.

Our server is using very few system resources and it is still running as fast as it can, especially since there are no context switches! If items appear in the thread pool quicker than our one thread can process them all, then the thread pool might create additional threads The thread pool will quickly create one thread per CPU on the machine So on a quad-processor machine, four client requests/database responses (in any combination) are running on four threads without any context switching 2 However, if any of these threads voluntarily block (by invoking a synchronous I/O operation, calling ThreadSleep, or waiting to acquire a thread synchronization lock), then Windows notifies the thread pool that one of its threads has stopped running The thread pool now realizes that the CPUs are undersaturated and creates a new thread to replace the blocked thread .

After this lesson, you will be able to:

2. Select a drive letter in the Drive box. You can choose any letter that s not already in use. 3. In the Folder box, type the path to the folder you want or, more easily, click Browse and navigate to the folder. 4. Select Reconnect At Logon if you want Windows to connect to this shared folder automatically at the start of each session. 5. If your regular logon account doesn t have permission to connect to the resource, click the Different User Name link, enter a user name and password, and click OK. (This capability is useful if you personally have multiple user accounts. For example, you might have an administrator account that has access to some folders that are not available to your regular logon account.) 6. Click Finish. In the Computer folder, the drive appears in the Network Location group. As a toplevel item in Computer, it also appears in the breadcrumb bar when you click the arrow to the right of Computer, as shown in the following figure.

This, of course, is not ideal because creating a new thread is very expensive in terms of both time and memory What s worse is that the blocked thread might wake up and now the CPUs are oversaturated again and context switching must occur, decreasing performance However, the thread pool is smart here As threads complete their processing and return to the pool, the thread pool won t let them process new work items until the CPUs become exactly saturated again, thereby reducing context switches and improving performance And if the thread pool later determines that it has more threads in it than it needs, it lets the extra threads kill themselves, thereby reclaiming the resources that these threads were using Internally, the CLR s thread pool uses a Windows resource called an I/O Completion Port to elicit the behavior that I ve just described .

Logging of test cases and results is a common feature of test automation frameworks A good emulation service will log incoming and outbound traffic as well With this approach, a test that passes can check to see if the correct data was sent to and from the service I once had a bug where a SQL Stored procedure would make two calls to a remote service but would write only one row of data in the database Without logging from the emulator, we would not have caught this bug Some of the better emulation solutions allow the test environment to be set up to call into the emulator but have flags to allow for the request to pass through In this approach, the emulator still logs all traffic but the request can go to a real instance of the service Emulation is ideal for load testing.