Discussion
Which of the following are the characteristics of multiprocessors ?
(i) Ability to share main memory and I/O devices
(ii) Increased reliability because of redundancy in processors
(iii) Increased throughput because of execution of multiple jobs in parallel
(iv) Portions of the same job in parallel
Answer: D
All four are characteristics, so the answer is (i), (ii), (iii) and (iv).
M. Morris Mano describes a multiprocessor as two or more CPUs interconnected with shared main memory and I/O equipment (i). Because a failure of one processor need not stop the system, reliability improves (ii). Throughput improves because the system can either run multiple independent jobs in parallel (iii) or split a single job into parts that execute in parallel (iv).
Each of the other options omits at least one of these.
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