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I have a subroutine that processes large blocks of information. In order to make use of the entire CPU, it divides the work up into separate threads. After all threads have completed, it finishes. I read that creating and destroying threads uses lots of overhead, so I tried using the threadpool, but that actually runs slower than creating my own threads. How can I create my own threads when the program runs and then keep reusing them? I've seen some people say it can't be done, but the threadpool does it so it must be possible, right? Here is part of the code that launches new threads / uses the threadpool: //initialization for threads Thread[] AltThread = null; if (NumThreads > 1) AltThread = new Thread[pub.NumThreads - 1]; do { if (NumThreads > 1) { //split the matrix up into NumThreads number of even-sized blocks and execute on separate threads int ThreadWidth = DataWidth / NumThreads; if (UseThreadPool) //use threadpool threads { for (int i = 0; i < NumThreads - 1; i++) { ThreadPool.QueueUserWorkItem(ComputePartialDataOnThread, new object[] { AltEngine[i], ThreadWidth * (i + 1), ThreadWidth * (i + 2) }); } //get number of threads available after queue System.Threading.Thread.Sleep(0); int StartThreads, empty, EndThreads; ThreadPool.GetAvailableThreads(out StartThreads, out empty); ComputePartialData(ThisEngine, 0, ThreadWidth); //wait for all threads to finish do { ThreadPool.GetAvailableThreads(out EndThreads, out empty); System.Threading.Thread.Sleep(1); } while (StartThreads - EndThreads > 0); } else //create new threads each time (can we reuse these?) { for (int i = 0; i < NumThreads - 1; i++) { AltTh

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