[理工] [計組]-效能

[gn00618777 (123)]

A certain machine with a 10ns(10*10^9s) clock period can
perform jump(1 cycle),branches(3 cycles),arithmetic intruction(2 cycles)
multiply intructions(5 cycles),and memory intruction(4 cycles).
A certain program has 10% jumps, 10% branches,50% arithmetic,10%
multiply. and 20% memory intructions.

What is the CPI of this program on this machine?

解答是說 clock=10ns

不是求CPI嗎？

題木我只看的懂說指令 jump CPI=1
                     branches CPI=3
                     arithmetic CPI=2
                     multiply CPI=5
                     memory CPI=4    （其實也不知道我這樣對不對）..

至於10ns是啥我不瞭捏

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→ gn00618777:10ns是clock cycle time嗎？一個週期的時間長度？
推 ianwuzack:對阿 是clock cycle time沒錯
→ gn00618777:那clock = 10ns又是怎回事  不是求cpi嗎？
推 ianwuzack:這題我有看過 這只是其中一個問題而已
→ ianwuzack:下面會接著求Eexcution time
→ gn00618777:阿 我懂了..沒事了呵呵..
→ gn00618777:對阿  這是呆大電機考題
→ gn00618777:計組沒補習 超難看的懂= ="