Cache性能分析 CPU time = CPU execution clock cycles Memory stall clock cycles)x clock cycle time Memory stall clock cycles (Reads x Read miss rate x Read miss penalty Writes x Write miss rate x Write miss penalty) Memory stall clock cycles Memory accesses x Miss rate x Miss penalty Different measure: AMAt Average Memory Access time(AMAt Hit Time +(Miss Rate x Miss penalty) Note: memory hit time is included in execution cycles. 2021-2-4 计算机体系结构Cache 性能分析 • CPU time = (CPU execution clock cycles + Memory stall clock cycles) x clock cycle time • Memory stall clock cycles = (Reads x Read miss rate x Read miss penalty + Writes x Write miss rate x Write miss penalty) • Memory stall clock cycles = Memory accesses x Miss rate x Miss penalty • Different measure: AMAT Average Memory Access time (AMAT) = Hit Time + (Miss Rate x Miss Penalty) • Note: memory hit time is included in execution cycles. 2021-2-4 计算机体系结构 45