[理工] [OS]-memory
10.(5%)In operating systems, the scheduler performs a rescheduling when
current process requests an I/O, the time slice assigned to current process
is exhausted, the current process yields, or higher-priority processes
arrive. On every rescheduling, it will take time for the kernel to perform
context switch. Is it possible for a round-robin scheduler with a
100-millisecond time slices to spend over half its time in the OS context
switch code? Assume that it take the OS 1 millisecond to context switch the
CPU. Please justify your answer and give an example.
這題看不懂，求強者幫忙解惑
Given a computer system with a 52-bit virtual address, 4 KB pages, and 4
bytes per page entry. Suppose that the maximum physical memory size is 512
GB, and the system is byte-addressable. Let paging be implemented for the
system. What is the number of bits for physical addresses, and what is the
maximum number of pages for a process?
52-bit virtual address → 252/4KB → 240 pages for a process.
想問答案b為什麼是這樣算~? 要求process占用的page個數
不是應該從phisical memory著手嗎?
謝謝
--
┌這篇文章讓您覺得？─────────────────────────────┐
│ │
│ 一"一 \ / >\\\< ╯ ╰ ∩ ∩ ▁ ▁ ＞＿＜ ㄧ ㄧ+ │
│ 皿 ε □ ▽ ▇Δ ▇ ╰╯ ╯ │
│ 北七 亂喔 害羞 莎笅 爽啦 哭爸 ＸＤ 科科 │
└──────────────────────────────────────┘
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 122.116.14.2
※ 編輯: polomoss 來自: 122.116.14.2 (01/19 00:17)
→
01/19 00:28, , 1F
01/19 00:28, 1F
推
01/19 19:35, , 2F
01/19 19:35, 2F
→
01/20 04:08, , 3F
01/20 04:08, 3F
討論串 (同標題文章)