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Server Architectures by René J. Chevance

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Chapter 4. Symmetrical (Tightly-Coupled) Multiprocessors

Symmetrical multiprocessors made their appearance during the 1960s in the high- end mainframe space, driven by the need for scalability. As we have explained earlier, scalability is the property that makes it possible to adapt a system to the size of the problem to be handled, and while problem size is often equated to the size of the processing problem it should not be forgotten that other dimensions are just as important, storage requirements and communications being key examples.

The processing capability of a symmetrical multiprocessor is adjusted to meet needs simply by installing additional processors until the requirements are met. This allows a customer to increase the capabilities ...

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