Memory Structure and Cache Management

These flashcards cover key concepts related to memory structure, cache management, mapping strategies, and their implications on system performance.

What is the primary purpose of cache memory?

The primary purpose of cache memory is to provide speed for the processor to access instructions and data rapidly.

What principle is used to optimize cache memory usage?

The principles of locality of reference are used to optimize cache memory usage.

What is a replacement strategy in cache management?

A replacement strategy determines which block in the cache memory should be replaced when space is needed.

Describe the 'least recently used' (LRU) strategy.

The LRU strategy removes the block that has not been used for the longest time when needing to free cache space.

What is associativity in mapping cache blocks?

Associativity refers to how cache blocks are mapped to primary memory blocks, with various strategies like associative mapping, direct mapping, and set associative mapping.

How does the cache block table function?

The cache block table keeps track of which blocks from primary memory are currently in the cache.

What does a 'hit' indicate in cache memory access?

A 'hit' indicates that the requested data is found in the cache.

What is the significance of block size in cache memory?

Block size determines how many blocks can fit in cache and affects performance, as a larger block may include more relevant data.

What impact does the increase in cache size have on cache performance?

As cache size increases, the cache block table grows, potentially slowing down the search for blocks within it.

How do you identify the offset and block number from a generated memory address?

The generated memory address is broken down into bits; the upper bits identify the block number in memory, and the lower bits identify the specific byte within that block.