[理工] OS-file system
以下為題目
A disk has 4000 cylinders, each with 8 tracks of 512 blocks.
A seek takes 1 msec per cylinder moved.
If no attempt is made to put the blocks of a file close to each other, two
blocks that are logically consecutive
(i.e., follow one another in the file) will require an average seek, which
takes 5 msec.
If, however, the operating system makes an attempt to cluster related blocks
, the mean interblock distance can be reduced to 2 cylinders and the seek
time reduced to 100 microsec. How long does it take to read a 100 block file
in both cases, if the rotational latency is 10 msec and the transfer time
is 20 microsec per block?
我看超久的還是不太懂怎麼寫 冏rz
希望有高手可以解答
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.117.194.90
討論串 (同標題文章)
以下文章回應了本文：
完整討論串 (本文為第 1 之 2 篇)：