Multiple Instruction and Multiple Data stream (MIMD)

In this association, multiple control units and multiple processing elements are prepared as in MISD. But the discrepancy is that now in this association multiple instruction streams function on multiple data streams . Thus, for handling multiple control units, multiple instruction streams and multiple processing elements are organized in the way of  multiple processing elements are conducting multiple data streams from the Main memory as given  in Figure 7. The processors work on their own given data with their own instructions. Tasks implemented by different processors can start or finish at dissimilar times. They are not lock-stepped, as in SIMD computers, although run asynchronously. This classification actually distinguished the parallel computer. That means in the actual sense MIMD organisation is supposed to be a Parallel computer. All multiprocessor systems drop under this classification. Examples include; Burroughs D825, Cray X-MP, C.mmp Cray-2, S1, HEP, Pluribus, Univac 1100/80, IBM 370/168 MP, Tandem/16, IBM 3081/3084, BBN Butterfly, C.m*, FPS T/40000, iPSC, Meiko Computing Surface (CS-1),.

This type of computer organisation is indicated as:

                                                                           I_s > 1

                                                                           D_s > 1

Of the classifications discussed over, MIMD organization is the most accepted for a parallel computer. In the actual sense, parallel computers implement the instructions in MIMD mode.