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copied!<p>I have had problems myself with delays in thread startup when using the (.Net 4.0) Task-object. So for time-critical stuff I now use dedicated threads (... again, as that is what I was doing before .Net 4.0.)</p> <p>The purpose of a thread pool is to avoid the operative system cost of starting and stopping threads. The threads are simply being reused. This is a common model found in for example internet servers. The advantage is that they can respond quicker.</p> <p>I've written many applications where I implement my own threadpool by having dedicated threads picking up tasks from a task queue. Note however that this most often required locking that can cause delays/bottlenecks. This depends on your design; are the tasks small then there would be a lot of locking and it might be faster to trade some CPU in for less locking: <a href="http://www.boyet.com/Articles/LockfreeStack.html" rel="noreferrer">http://www.boyet.com/Articles/LockfreeStack.html</a></p> <p>SmartThreadPool is a replacement/extension of the .Net thread pool. As you can see in this link it has a nice GUI to do some testing: <a href="http://www.codeproject.com/KB/threads/smartthreadpool.aspx" rel="noreferrer">http://www.codeproject.com/KB/threads/smartthreadpool.aspx</a></p> <p>In the end it depends on what you need, but for high performance I recommend implementing your own thread pool. If you experience a lot of thread idling then it could be beneficial to increase the number of threads (beyond the recommended cpucount*2). This is actually how HyperThreading works inside the CPU - using "idle" time while doing operations to do other operations.</p> <p>Note that .Net has a built-in limit of 25 threads per process (ie. for all WCF-calls you receive simultaneously). This limit is independent and overrides the ThreadPool setting. It can be increased, but it requires some magic: <a href="http://www.csharpfriends.com/Articles/getArticle.aspx?articleID=201" rel="noreferrer">http://www.csharpfriends.com/Articles/getArticle.aspx?articleID=201</a></p>

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