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Linking processors
Multiprocessor design
Creating a multiprocessor from a number of
uniprocessors (one CPU) requires physical links and a
mechanism for communication among the processors so that
they may operate in parallel. Tightly coupled
multiprocessors share memory and hence may communicate
by storing information in memory accessible by all
processors. Loosely coupled multiprocessors, including computer
networks, communicate by sending messages to each other
across the physical links. Computer scientists
investigate various aspects of such multiprocessor
architectures. For example, the possible geometric
configurations in which hundreds or even thousands of
processors may be linked together are examined to find
the geometry that best supports computations. A much
studied topology is the hypercube, in which each
processor is connected directly to some fixed number of
neighbours: two for the two-dimensional square, three
for the three-dimensional cube, and similarly for the
higher dimensional hypercubes. Computer
scientists also investigate methods for carrying out
computations on such multiprocessor machines--e.g.,
algorithms to make optimal use of the architecture,
measures to avoid conflicts as data and instructions are
transmitted among processors, and so forth. The
machine-resident software that makes possible the use of
a particular machine, in particular its operating
system, is in many ways an integral part of its
architecture.
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