What is Average memory access time?
The average time per memory access, computed as hit time + miss rate × miss penalty. A basic metric for comparing cache designs.
Field: Memory Hierarchy
Average memory access time in the explanations
The average memory access time is therefore 1 + 0.05 × 30 = 1 + 1.5 = 2.5 ns.
With an L1 hit time of 1 ns and miss rate of 5%, an L2 hit …Average memory access time = hit time + miss rate × miss penalty = 2 + 0.04 × 150 = 2 + 6 = 8 cycles.
With a cache hit time of 2 cycles, a miss rate of 4% and a …Average memory access time depends on hit time, miss rate and miss penalty together.
Why must cache designs be compared by average memory access…
Questions that mention Average memory access time (3)
- With an L1 hit time of 1 ns and miss rate of 5%, an L2 hit time of 10 ns and local miss rate of 20%, and main memory access time of 100 ns, what is the average memory access time?
- With a cache hit time of 2 cycles, a miss rate of 4% and a miss penalty of 150 cycles, what is the average memory access time in cycles?
- Why must cache designs be compared by average memory access time rather than miss rate alone?
Related terms
Miss penalty Cache line Capacity miss Compulsory miss Conflict miss Direct-mapped cache Fully associative cache Loop blocking LRU replacement Non-blocking cache