Memory2 Flashcards

What is cache locality?: Reuse of nearby or recent data
What is temporal locality?: Reusing recently accessed data
What is spatial locality?: Accessing nearby memory locations
What is cache hit?: Data found in cache
What is cache miss?: Data not found in cache
What is cache hit ratio?: Cache hits divided by total accesses
What is cache miss penalty?: Extra time after a cache miss
What is L1 cache?: Smallest and fastest CPU cache
What is L2 cache?: Middle-level CPU cache
What is L3 cache?: Larger shared CPU cache
What is write-through cache?: Writes update cache and memory
What is write-back cache?: Writes update memory later
What is cache coherence?: Keeping shared cache data consistent
What is a dirty bit?: Marks modified cache block
What is a cache line?: Fixed-size block in cache
What is direct-mapped cache?: Each block maps to one cache line
What is set-associative cache?: Block maps to one cache set
What is fully associative cache?: Block can go anywhere
What is page fault?: Needed page not in RAM
What is paging?: Dividing memory into fixed pages
What is segmentation?: Dividing memory into logical segments
What is virtual address?: Address used by a program
What is physical address?: Actual RAM address
What is MMU?: Memory Management Unit
What does MMU do?: Translates virtual to physical address
What is TLB?: Translation Lookaside Buffer
What does TLB store?: Recent address translations
What is thrashing?: Excessive page swapping
What is memory fragmentation?: Wasted unusable memory space
What is garbage collection?: Automatic unused memory cleanup