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Ch3 效能評估（Performance）
第 18 題／共 35 題
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18. CPU Performance、CPI、MIPS Metric
#CC-03-018
中
CPU Performance
CPI
MIPS Metric
📝
☆
Consider the CPU performance, which of the following statements are correct?
A
(a) If you want to decrease the response time of a task, you can promote your PC by replacing the old single-core CPU with a new multi-core CPU and using a new operating system that can partition a task into several load-balanced sub-tasks and execute all sub-tasks on all cores concurrently. Assume the performance of the single-core CPU is the same as that of each core of new multi-core CPU.
B
(b) If we run two programs on two CPUs of different ISAs to perform the same task, the CPU with smaller CPI must have less CPU time than the other CPU since smaller CPI also implies that the required number of cycles to complete a task is also less than that of the other CPU.
C
(c) The CPU time of performing a program on a CPU is determined by the instruction count, the CPI, and the clock rate of the CPU.
D
(d) Consider using the metric of Millions of Instructions per Second (MIPS) to measure the CPU performance. Two programs are run on single-core CPUs
C
A
C_A
C
A
and
C
B
C_B
C
B
of different ISAs to solve the same task.
C
A
C_A
C
A
requires less time than
C
B
C_B
C
B
to complete the task while
C
A
C_A
C
A
has less MIPS than
C
B
C_B
C
B
. The abovementioned facts implies that
C
A
C_A
C
A
is likely a CISC-based CPU and
C
B
C_B
C
B
is a RISC-based CPU.
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