The book is designed to be used by seniors and/or graduate students in computer science, electrical engineering, industrial engineering, and in any other fields demanding the use of high-performance mainframe computers, attached vector processors, scientific supercomputers, and multiprocessors to solve specific applications problems. Parallel processing can be applied at the hardware/software system level or at the algorithmic and programming level. It demands concurrent execution of many programs in the computer. Parallel-processing computers provide a cost-effective means to achieve high system performance through concurrent activities.