[理工][OS & 計組]98清大 資工所

[aideliemoon (Cerscent)]

5.What are the drawbacks of client-server architecture?

  請問一下client-server architecture是什麼東西?

  查課本也找不太到

9.consider a 5-stage pipelined datapath where ALU computation is performed

  at the third stage and data memory read is performed at the fourth stage.

  We have a program of 1000 instruction is the format of "load,add,load,add,..".

  Each add instruction is form "add $a,$b,$c"which performs $a = $b + $c.

  Each load instruction is form "load $t,k($s)"which performs $t = memory[$s+k]

  Suppose each add instruction depends(and only depends on)the load instruction

  right before it.Each load instruction also depends(and only depends ) on the

  add instruction right before it. With forwarding,what would be actual CPI?


  這題他沒說add和load須要幾個cycle 所以我就當一個stage一個cycle

  並且add在load的左側load不須stall cycle 但load在add左測加上forwarding技術add需

  sall 1 cycle

  因此add要6個cycle load要5個 所以CPI = 500*(5+6)/1000 = 5.5

  不知道這樣算對嗎?
10. Explain the ideas behind the following instruction-set-architecture design

    chaos?

    (a)Keep all instruction a single size.

    (b)Have 32 reigisters rather than many more.


     a.我想是 simplicity favors regularity

     b. smaller is faster

     不知道這樣對嗎

請會的版友幫我解一下疑惑 先在這說聲謝謝了




--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.43.160.197
推 uminchu185:1.PTT應該就是一個例子. 2.要考慮它是pipeline, 指令
→ uminchu185:可以重疊, 約3個cycle完成2個指令,CPI=1.5.
→ uminchu185:3. 我的想法跟你是一樣的.  有錯請更正~
→ aideliemoon:對後，pipeline不考慮stall的話是1個cycle完成一道嘛
→ aideliemoon:我都忘了，謝謝<(_ _)>
※ 編輯: aideliemoon     來自: 114.43.160.197       (01/10 14:26)
→ assassin88:3.正確