Local disks hold files retrieved from disks on remote

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Unformatted text preview: ery computer system are organized as the memory hierarchy shown in Figure 1.9. As we move from the L0: registers L1: Larger, slower, and cheaper storage devices L2: on-chip L1 cache (SRAM) off-chip L2 cache (SRAM) main memory (DRAM) CPU registers hold words retrieved from cache memory. L1 cache holds cache lines retrieved from memory. L2 cache holds cache lines retrieved from memory. Main memory holds disk blocks retrieved from local disks. Local disks hold files retrieved from disks on remote network servers. L3: L4: local secondary storage (local disks) L5: remote secondary storage (distributed file systems, Web servers) Figure 1.9: The memory hierarchy. top of the hierarchy to the bottom, the devices become slower, larger, and less costly per byte. The register file occupies the top level in the hierarchy, which is known as level 0 or L0. The L1 cache occupies level 1 (hence the term L1). The L2 cache occupies level 2. Main memory occupies level 3, and so on. The main idea of a memory hierarchy is that storage at one level serves as a cache for storage at the next lower level. Thus, the reg...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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