The Essentials ofComputer(computer) 440

The Essentials ofComputer(computer) 440 - Flynns taxonomy...

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Flynn’s taxonomy falls short in several areas. For one, there seem to be very few (if any) applications for MISD machines. Secondly, Flynn assumed that par- allelism was homogeneous. A collection of processors can be homogeneous or heterogeneous. A machine could conceivably have four separate floating-point adders, two multipliers, and a single integer unit. This machine could therefore execute seven operations in parallel, but it does not readily fit into Flynn’s classi- fication system. Another problem with this taxonomy is with the MIMD category. An architec- ture with multiple processors falls into this category without consideration for how the processors are connected or how they view memory. There have been several attempts to refine the MIMD category. Suggested changes include subdividing MIMD to differentiate systems that share memory from those that don’t, as well as categorizing processors according to whether they are bus-based or switched.
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