• A classification of computer architectures, proposed in 1966 by Michael J. Flynn. The classification system has stuck, and it has been used as a tool in the design of modern processors and their functionalities. Since the rise of multiprocessing central processing units (CPUs), a multiprogramming context has evolved as an extension of the classification system. The four initial classifications defined by Flynn are based upon the number of concurrent instruction (or control) streams and data streams available in the architecture: single instruction stream, single data stream (SISD); single instruction stream, multiple data streams (SIMD); multiple instruction streams, single data stream (MISD); and multiple instruction streams, multiple data streams (MIMD). Flynn defined three additional subcategories of SIMD in 1972. ← Wikipedia

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