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A comment on FreeBSD 10.3. Parent comment
* 1:1, where each userland thread maps directly to a kernel thread
* 1:N, where several userland threads map directly to one kernel thread
* M:N, where the kernel maintains a pool of threads and dispatches userland threads to them
History has shown that 1:1 threading has the best trade offs. It's worth more independent research if you are interested in Operating Systems.
* 1:1, where each userland thread maps directly to a kernel thread
* 1:N, where several userland threads map directly to one kernel thread
* M:N, where the kernel maintains a pool of threads and dispatches userland threads to them
History has shown that 1:1 threading has the best trade offs. It's worth more independent research if you are interested in Operating Systems.