[理工] 計組

[BaaaSwin (codown)]

1.To achieve the speed-up of 91 on the  previous larger problem with 100
processor , we assumed the load was perfectly balanced. That is, each of
the 100 processors had 1% of the work to do . Instead , show the
impack on speed-up if one processors's load is higher than all
the rest. Calculate at 2% and 5% .

ans:
If one process has 2% of the parallel load, then it must do 2%*10000
or 200 additions, and the other 99 will share the remaining 9800.

我看不太懂什麼是 parallel load , 這題到底在問什麼??

2.(T/F)A runing process is swapped to disk entirely when new page
are moved into the main memory.

and:False

why??是因為要被replace的page不是dirty的嗎?

--
※ 發信站: 批踢踢實業坊(ptt.cc) 
◆ From: 114.43.77.75
推 sting47:第一題是在問你負載平衡的重要，並要你秀出如果其中一個
→ sting47:處理器做了2%跟5%的工作，會有什麼影響(你字應該打錯，是
→ sting47:impact 影響的意思)
→ BaaaSwin:恩恩,可是他給我們91的speed是用100個process
→ BaaaSwin:怎麼去定義它只用1個process的總時間以及
→ BaaaSwin:可以被平行執行的百分比??
→ sting47:平行執行?現在題目就是假設現在100processors是平行執行且
→ sting47:perfectly balanced，也就是每個processor都做1%的工作。
→ sting47:所以其中一個執行了2%的工作的話，其餘99個processors就要
→ sting47:平行執行剩下的98%工作。另外看起來像是有上一題?如果上一
→ sting47:題沒提到總時間的數據，就自己假設個好算的數字就好
推 jkw552403:第二題 page fault也不一定要SWAP而且他寫SWAP entirely
→ jkw552403: 我覺得有點怪 參考一下
→ BaaaSwin:第一題真的有前面一提耶QQ那我會了謝謝
→ BaaaSwin:第二題的swap會不會是把整個programing放到disk???