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NET often creates threads automatically without you having created Thread objects The most obvious example is the thread that the NET Framework calls your Main method on, but there are others some of the asynchronous communication mechanisms we saw in 13 call back into your code on different threads than the one you started work on We ll be seeing more examples of this later in the chapter when we examine NET s Asynchronous Programming Model In fact, it s relatively unusual to create new threads explicitly If you need concurrent execution and you re not using some part of the NET Framework that supplies you with threads when you need them, it s often better to use the thread pool or the Task Parallel Library, both of which we ll see later..

Xen. The memory that Xen requires may become inadequate and the virtual machines may slow down significantly. You can do this by unchecking Desktop GNOME and Desktop KDE when you see the screen shown in Figure 18-5 during the installation of your CentOS guest. This is what I did when I installed the CentOS guest for this chapter.

One problem with explicit thread creation is in knowing how many to create. Threads are relatively expensive each one consumes system resources, and there are also factors that can limit the number of threads in a single process. There s also a cost in switching between threads the context switch that occurs when the OS scheduler moves a thread from one logical processor to another. If you have many more runnable threads than logical processors, you ll pay this cost on a very regular basis, and it can start to have a significant effect on throughput. In an ideal world you would have no more threads than logical processors, avoiding any context switch overhead. However, most threads block from time to time, so in reality you tend to need more threads than logical processors if you want to fully use your CPU cycles. In general, you should try to keep the thread count as low as is practical a single program that creates more than a handful per logical processor is likely to have problems.

Never build a service that creates a new thread for each incoming request. This is a classic rookie mistake, as it seems like an obvious thing to do. It appears to work for light workloads, but it runs straight into two of the biggest performance problems you can hit with threads. First, creating threads is expensive, so if each thread exists only for as long as it takes to handle a single request, you risk spending more CPU time on setting up and destroying threads than on useful work. Second, this approach doesn t limit the number of threads, so as the system gets busy, its performance will get disproportionately worse thanks to context switching overhead and the memory footprint of the resources associated with each thread. You can avoid these problems by using either the asynchronous patterns or the thread pool techniques described later in this chapter.

After the installation process completes, the installer will reboot, and Xen will handle the booting of the CentOS guest. A running session of your new virtual machine is shown in Figure 18-6.

Creating just enough threads is often hard, because getting the balance right depends on things such as your application s current workload, other work in progress on the machine, and characteristics of the machine itself. Fortunately, .NET provides the thread pool to make this sort of thing easier.

The .NET Framework provides a thread pool, which is a collection of worker threads available to perform short pieces of work. The thread pool continuously adjusts the number of threads that are allowed to process work items simultaneously in an attempt to optimize throughput. The exact algorithm used to adjust the thread count is not documented, but as a general rule, if the system is not busy, work will typically be serviced very quickly after you queue it up. But as the computer becomes busier, items will sit in the queue for longer the thread pool tries to avoid the overheads of preemption, thread switching, and resource contention by not running too much concurrent work. When a system is already busy, trying to process more work items would probably slow it down further, and so

keeping items queued up and processing fewer at a time is likely to result in better overall performance. The simplest way to use the thread pool is through its QueueUserWorkItem method. Example 16-6 shows a modification to the previous examples rather than creating threads, it uses the thread pool. QueueUserWorkItem takes a delegate to any method that accepts a single object as its argument, so it s happy with the same Go method as Example 16-2. (Unlike the Thread constructor, there s no overload that accepts a method without an argument the thread pool insists on there being an argument whether you have a use for one or not.)

Figure 18-6. Your new virtual machine! With your first CentOS guest running on your Xen hypervisor, you can log into it, run shell scripts, package installation, and set up servers just like another system. Let s look at the current domains running on your Xen setup using the xm list command. The output should be similar to Figure 18-7.

static void Main(string[] args) { ThreadPool.QueueUserWorkItem(Go, "One"); ThreadPool.QueueUserWorkItem(Go, "Two"); Go("Main"); // Problem: not waiting for work items to complete!

}