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Caches
are essential to gain the maximum performance from
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modern
microprocessors
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The
performance of a cache is close to that of SRAM but at the
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cost of DRAM
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Caches
can be used to form the basis of a parallel computer
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Bus-based
multiprocessors do not scale well: max < 10
nodes
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Larger-scale
shared-memory multiprocessors require more
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complicated
networks and protocols
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CC-NUMA
is becoming popular since systems can be built from
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commodity
components (chips, boards, OSs) and use existing
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software
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e.g.
HP/Convex, Sequent, Data General, SGI, Sun, IBM
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