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If we divide functions among several processors, then if one processor fails then it will not affect the system or we can say it will not halt the system, but it will affect on the work speed.

Suppose I have five processors and one of them fails due to some reasons then each of the remaining four processors will share the work of failed processor. So it means that system will not fail but definitely failed processor will affect on its speed.

Another significant disadvantage of a multiprocessor system over one using a single single-core processor is a considerably more complex hardware and software design, as algorithms and tasks need distributing among the cores and processors to maximize the benefit of parallel processing, while an effort to synchronize access to shared resources such as main memory and most I/O devices is required.

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