1. Storage unit: The basic unit of memory access by the CPU, and each unit has an address. Usually an integer multiple of the size in bytes.
2. CPU clock cycle = 1/main frequency, the unit is usually MHz
3. CPU execution time = CPU clock cycle number * clock cycle time length (1/main frequency) = (instruction number *CPI)/main frequency --> The main frequency unit is Hz
4. MIPS(million introductions per second) = (number of instructions/execution time) / 10^6 =
number of instructions/ ((number of instructions*CPI)/frequency*10^6) / 10^6 = frequency /CPI -->The main frequency unit is MHz
5. Wang Dao Shu 2017 Edition P16, question 18:
t_cpu = 90s t_io = 10s
t_new = 1 / [(1/t_cpu) * (1+50%)] + t_io = 1/[(1/90) * 1.5] + 10 = 60+10s = 70s
Note: here is a 50% increase in speed, indicating that speed is inversely proportional to time.
6. The reason why the computer is centered on the calculator in the early days: the calculator and the controller are separated, and the amount of information to be processed and processed is very small, resulting in a small memory capacity, and the information transmission is completed through the calculator.