A thread pool improves performance by creating a collection of threads during application initialization. When a thread is required, it is assigned a single task. That task will be executed. Once executed, the thread is returned to the thread pool to be reused.
Since thread creation is expensive in .NET, we can improve performance by using a thread pool. Each process has a fixed number of threads based on the system resourcesavailable, such as memory and the CPU. However, we can increase or decrease the number of threads used by the thread pool. It is normally best to let the thread pool take care of how many threads to use, rather than manually setting these values.
The different ways to create a thread pool are as follows:
- Using the Task Parallel Library (TPL) (on .NET Framework 4.0 and higher)
- Using ThreadPool.QueueUserWorkItem()
- Using asynchronous delegates
- Using BackgroundWorker
