One-to-one model provides more concurrency than the many-to-one model by allowing another thread to run when a thread makes a blocking system call.

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In the one-to-one model, each thread has its own kernel-level thread, which allows concurrency when one thread is blocked on a system call. Whereas in the many-to-one model, multiple user-level threads are mapped to a single kernel-level thread, leading to less concurrency when one thread is blocked.

One-To-One Model Provides More Concurrency Than the Many-To-One Model by Allowing