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As with the Windows thread pool, the CLR's pool abstracts the management of threads through the use of some sophisticated heuristics The specific heuristics employed are different, however These heuristics determine the optimal number of threads by looking at the machine architecture, rate of incoming work, and the current CPU utilization across the entire machine Often referred to as the thread inj ection and reti rement a lgorit hm, this logic decides when to create new threads to process work and when to destroy threads due to lengthy periods of idle queue activity or because the machine is fully utilized This is great because without it you'd need to fig ure it out yourself (and test it on various machine configurations, of course) Even better is that most people can remain unaware of the specific algo rithms behind injection and retirement Depending on internal implemen tation details such as this is a bad idea anyway But understanding them can help you to understand the performance and scalability characteristics of your program, and it is interesting for those who are thinking about alternative ways to schedule work Recall that the CLR thread pool actually manages two sets of threads: one of them handles general work items (Qu e u e U s e rWo r k I t em, timer expiration callbacks, and wait registration callbacks); and the other handles any I/O completions (due either to B i n d H a n d l e or U n s afeNat iveQueueNat iveOve r

The main difference is in how work is queued to the threads: in the worker thread case, there is a custom pool and associated work queue, while in the I/O thread case, everything happens through I / O completion ports Addi tionally, I / O completion ports throttle the number of running threads When work is queued to the pool, the thread pool will create threads on the calling thread until the optimal number of threads has been reached That optimal number is the processor count of the current machine Once this target has been reached, the CLR will throttle the creation of threads The CLR's heuristics are more complicated than the native pool heuristics (and one could argue not as effective), so we will avoid going into detail on the specific algorithms To summarize:

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As soon as the target count has been reached, new thread creation is throttled at a maximum rate of one thread per 500 milliseconds

Under no circumstances will the thread pool exceed this creation rate once the number of threads outnumbers the number of proces sors or minimum thread count, whichever is larger

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A daemon thread runs in the background, periodically looking for starvation and possibly injecting new threads to service work This decision is made based on complex logic that considers the depth of the work queue and the CPU utilization of the machine Generally if the utilization is too low, it generates more threads; if the utilization is very high, it removes threads

If there are two or more idle threads with no work in the thread pool, the thread pool will instruct the excess threads to quit (subject to the minimum) This helps to ensure there aren't too many threads with no work to do The remainder will eventually be taken care of by the daemon thread

I t i s possible t o set the minimum and maximum number o f threads in the pool, as we will see soon, which ensures the pool never shrinks below or grows above the specific values, respectively

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This thread injection and retirement logic is similar for I/O threads It is more effective, however, because I/O completion ports automatically throt tle the number of runnable threads based on when threads block in the kernel As a developer, you have little to no control over any of this What you can control is the minimum and maximum number of threads in the pool Usually the defaults are fine, but let' s take a look at this feature anyway

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