What is the meaning of memory hierarchy and why is this concept of importance to the designer of PCs and similar workstations?
What will be an ideal response?
Memory devices can be arranged in a hierarchy with the fastest at the top (e.g., register memory and cache memory) with the slowest at the bottom (optical storage and tape). In general, memory capacity and cost/bit are inversely proportional to speed. The following diagram describes the memory hierarchy
The important aspect of the memory hierarchy is that each component has its place or niche in a system. For example, tape is very slow but you can back up a vast amount of data cheaply and store it off?site to ensure that theft or fire does not lead to a loss of vital data. Similarly, cache memory is expensive but a small
quantity can considerably improve computer performance. Memory management techniques (and cache memory management) can be implemented in hardware and software to make the computer look like a largest fast store to its user.
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