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Multi-threaded application cannot take advantage of multiprocessing.

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A multithreaded system comprising of multiple user level threads cannot make use of the different processors in a multiprocessor system simultaneously.

BECAUSE The operating system sees only a single process and will not schedule the different threads of the process on separate processors.

Consequently, there is NO performance benefit associated with executing multiple user-level threads on a multiprocessor system.

Note the word  MULTIPLE USER LEVEL THREADS! if it were KERNEL LEVEL threads then they can be scheduled on different processors thereby increasing performance!

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