Cache对处理器性能的影响：CP Program execution 200 400 600 800 1000 1200 1400 Time order (in instructions) 1dx1,100(x4) Instruction Reg ALU Data Reg 图4-25 fetch access Data 1dx2,200(x4) 200ps Instruction fetch Reg ALU access Reg Data 1dx3.400(x4) 200ps Instruction fetch Reg ALU access Reg 200ps200ps200ps 200ps200ps Memory CPU 9 bu3 VO bue Memory Vo devicea Registere h Disk memory Regiater Cache Memory reference reference referenoe reference Size:500 bytee 64KB 1 GB 1TB Speed: 250pa 1n8 100n8 10 meCache对处理器性能的影响：CPI=1 图4-25