Threads, green threads, fibers, green fibers, pthreads, user threads, kernel threads, hyper threads, how the bloody hell do you make sense of the thread menagerie? 
Is there any comprehensive overview somewhere that discusses all the different types of threads and what their relationship is with the OS and the scheduler? I've heard so much contradicting information about whether you want certain types of threads, or whether thread pooling is a performance gain or a performance hit, or that threads are heavy weight so you should use these other kind of threads that don't map directly to real threads but then how is that different from thread pooling .... I'm paralyzed. How does anyone make sense of it? Assuming the use of a language that actually directly interacts with threads (I'm aware of concurrent languages, implicit parallelism, etc. as an alternative to needing to know this stuff but I'm curious about this at the moment)
Threads, green threads, fibers, green fibers, pthreads, user threads, kernel threads, hyper threads, how the bloody hell do you make sense of the thread menagerie? 
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Is there any comprehensive overview somewhere that discusses all the different types of threads and what their relationship is with the OS and the scheduler? I've heard so much contradicting information about whether you want certain types of threads, or whether thread pooling is a performance gain or a performance hit, or that threads are heavy weight so you should use these other kind of threads that don't map directly to real threads but then how is that different from thread pooling .... I'm paralyzed. How does anyone make sense of it? Assuming the use of a language that actually directly interacts with threads (I'm aware of concurrent languages, implicit parallelism, etc. as an alternative to needing to know this stuff but I'm curious about this at the moment)