[理工] 模擬考OS

看板Grad-ProbAsk作者jackbll (阿湯)時間14年前 (2012/01/18 19:24)推噓4(4推 0噓 13→)

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恩...第二次模考的題目蠻多疑問的第二部分 part I 選擇 -------------------------------------- 3. Monitors 的敘述哪些是對的? (D) Monitor can solve more complicated synchornization problem than semaphore 這個錯了嗎@@? monitor不是改進 semaphore ?? 6. disk bad block 的敘述哪些是錯的? (A) bad blocks can be locked away in the corresponding FAT entries for some disk with IDE controllers. (B) The controller can be told to replace each bad sector logically with one of the spare sectors,This scheme is known as sector sparing. (C) Some controllers can be instucted to replace a bad block by sector slipping. (D) The sector stealing technique can map the bad sector to another normal sector.Hence,a sector can be referenced with two different sector number (E) In SCSI,the spare sectors processing will not destroy the optimal preform of disk scheduling. 答案DE 我怎麼沒印象課本有講到 bad block Q口Q 7.In Solaris 2,an intermediate level of threads called light weight process (LWP) between the user threads and kernel threads ... 反正要問關於LWP的敘述哪個是錯的? (A)user threads的排程&內文轉換是thread liberary with little support from kernel (B)一個LWP對映到一個kernel thread (E)user threads and LWPs are user space data structures, while kernel threads are kernel spaces resources. 答案(A)(E) 但是我覺得(B)錯了課本這邊舉了五個不同檔案讀取要求所以五個LWP 都會卡在這個 kernel I/O 感覺很怪也有可能是我沒讀通麻煩大家了感恩~~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 1.168.204.167

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jackbll

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