The ability to execute independent programs, or independent parts of a single program, simultaneously using different flows of execution, called threads. The illusion of multiple thread execution is often achieved on a single conventional processor through the use of multitasking. Multitasking relies on the ability of an operating system (OS) to overlap the execution of multiple threads or programs on a single processor by running each thread successively for short intervals. Multitasking provides the illusion of simultaneous execution of multiple threads but does nothing to enhance the overall computational capability of the processor.
A coarse grained multithreaded processor has the opportunity to quickly switch to another thread after a cache miss and perform useful work while the first thread awaits its data from memory. Many programs spend considerable time waiting for memory operations and a coarse grained multithreaded processor has the opportunity to increase overall system throughput, compared to a conventional processor performing OS-based multitasking. Therefore, Multitasking makes the tasks easier and are feasible for Operating Systems.
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