What is the Length of ALL the Clock Cycles in a Single Cycle and Multi Cycle...
What is the Length of ALL the Clock Cycles in a Single Cycle and Multi Cycle Machine (MIPS Architecture)?
Homework Answers
multi-cycle
different number of cycles by different instructions:
- 3 cycles:j, beq
- 4 cycles: R-Type, sw, addi
- 5 cycles: lw
CPI average :
- .25% loads
- 10% stores
- 11% branches
- 2% jumps
- 52% R-type
Average CPI = (0.11 + 0.02) 3 +(0.52 + 0.10) 4 +(0.25) 5
= 4.12
Cycle per instruction = 4.12
Single cycle
cycle time limited by longest instruction (lw)
The processor needs cycles per instruction (CPI) cycles for each
instruction.
maximum clock speed =f,
the clock period is therefore T=1/f
CPU time = Instructions executed* CPI * Clock cycle time
we assumed each instruction took one cycle, so CPI = 1.
— The CPI can be >1 due to memory stalls and slow
instructions.
— The CPI can be <1 on machines that execute more than 1
instruction
per cycle
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