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Jun 19, 2023 · In the Computer System Design, Memory Hierarchy is an enhancement to organize the memory such that it can minimize the access time. The Memory Hierarchy was developed based on a program behavior known as locality of references.
In computer organisation, the memory hierarchy separates computer storage into a hierarchy based on response time. Since response time, complexity , and capacity are related, the levels may also be distinguished by their performance and controlling technologies. [1]
Mar 29, 2021 · In computer systems design, the concept of memory hierarchy is an enhancement to organize the computer's memory such that access time to memory is minimized. Memory hierarchy was developed based on a software program's behavior known as locality of references.The figure below depicts the different levels of memory hierarchy :
Cache memory must be loaded in from the main system memory (the Random Access Memory, or RAM). RAM however, only retains its contents when the power is on, so needs to be stored on more permanent storage. We call these layers of memory the memory hierarchy
In a hierarchical memory system, the entire addressable memory space is available in the largest, slowest memory and incrementally smaller and faster memories, each containing a subset of the memory below it, proceed in steps up toward the processor.
Memory Hierarchy¶ In an ideal, simple computer there would only be one memory - the main memory. That memory would be instantaneously accessible, allow permanent storage, require minimal energy, and be compact and cheap. Unfortunately, no technology offers all those features.
The gap between CPU and main memory speed is widening. Well-written programs tend to exhibit good locality. These properties complement each other well for many types of programs. They suggest an approach for organizing memory and storage systems known as a memory hierarchy.
