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The notions of primary and secondary memory arise as part of the memory hierarchyin a computer system. To understand the hierarchy, we must consider both performanceand cost: memory that has the highest performance characteristics is also themost expensive. Thus, an architect must choose memory that satisfies cost constraints.Research on memory use has led to an interesting principle: for a given cost, optimalperformance is not achieved by using one type of memory throughout a computer.Instead, a set of technologies should be arranged in a conceptual memory hierarchy.The hierarchy has a small amount of the highest performance memory, a slightly largeramount of slightly slower memory, and so on. For example, an architect selects a smallnumber of general-purpose registers, a larger amount of primary memory, and an evenlarger amount of secondary memory. We can summarize the principle:
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