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Week 8 Virtual Memory

Week 8 Virtual Memory
22問 • 11ヶ月前
  • ユーザ名非公開
    • 通報

    問題一覧

  • 1

    What is the primary characteristic of Main Memory (RAM) described in the lecture?

    It is predominantly volatile, losing values when the system is powered down.

  • 2

    If memory addresses in instructions were always physical addresses, why would multiprogramming be difficult?

    User programs could interfere with each other or the operating system.

  • 3

    What abstraction does an "address space" provide for memory?

    A large, private memory for each process, addressed from 0 to some limit.

  • 4

    How is Virtual Memory typically implemented on modern systems?

    By paging, where the virtual address space is divided into fixed-size pages.

  • 5

    What is the role of the Memory Management Unit (MMU)?

    To translate virtual addresses to physical addresses.

  • 6

    What happens if the MMU encounters an address in an "unmapped page"?

    It raises a "page fault" interrupt, passing control to the OS.

  • 7

    Which component stores the mapping between pages in a process's virtual address space and frames in physical memory?

    The Page Table

  • 8

    During normal operation (when a page is present in memory), how does the MMU handle virtual address translation?

    It transparently maps the virtual address to the physical address in hardware

  • 9

    When a page fault occurs, what is the first step the OS must typically do?

    Find an available frame in physical memory to hold the accessed virtual memory.

  • 10

    If an evicted page is "dirty" during page fault handling, what must happen?

    Its data must be backed up to disk.

  • 11

    What is the purpose of Page Replacement Algorithms (PRAs)?

    To choose which page to evict from a physical frame when a page fault occurs and no free frames are available.

  • 12

    Why is a Translation Lookaside Buffer (TLB) used in the MMU?

    To cache recently used virtual-to-physical address translations for speed.

  • 13

    Main memory (RAM) is a volatile storage, meaning its values are lost when the system is powered down

    True

  • 14

    If programs directly used physical addresses, it would simplify multiprogramming by allowing easier memory sharing between processes.

    False

  • 15

    An address space provides an abstraction where each process appears to have a large, private memory, isolated from other processes.

    True

  • 16

    Virtual memory is typically implemented by dividing the virtual address space into variable-sized "segments."

    False

  • 17

    The Memory Management Unit (MMU) is a software component responsible for translating virtual addresses to physical addresses.

    False

  • 18

    A "page fault" occurs when a virtual page is successfully mapped to a physical memory frame.

    False

  • 19

    Each process has its own page table, which maps its virtual pages to physical memory frames.

    True

  • 20

    During normal virtual address translation (when a page is present), the operating system is heavily involved in every address lookup.

    False

  • 21

    If a page is "dirty," it means it has been modified since it was loaded into memory from disk.

    True

  • 22

    The Translation Lookaside Buffer (TLB) is an optimization that helps speed up virtual address translation by caching frequently used page table entries.

    True

    • 1.1: Software life cycle

    1.1: Software life cycle

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    ユーザ名非公開 · 19問 · 2年前

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    19問 • 2年前
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    ユーザ名非公開 · 5問 · 2年前

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    5問 • 2年前
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    Quiz 1

    Quiz 1

    ユーザ名非公開 · 8問 · 2年前

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    Week 2 Concurrency

    Week 2 Concurrency

    ユーザ名非公開 · 10問 · 11ヶ月前

    Week 2 Concurrency

    Week 2 Concurrency

    10問 • 11ヶ月前
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    Week 3 Mutual Exclusion

    Week 3 Mutual Exclusion

    ユーザ名非公開 · 3回閲覧 · 12問 · 11ヶ月前

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    3回閲覧 • 12問 • 11ヶ月前
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    Week 4 Synchronisation

    Week 4 Synchronisation

    ユーザ名非公開 · 10問 · 11ヶ月前

    Week 4 Synchronisation

    Week 4 Synchronisation

    10問 • 11ヶ月前
    ユーザ名非公開

    Week 5 Processes and scheduling

    Week 5 Processes and scheduling

    ユーザ名非公開 · 22問 · 11ヶ月前

    Week 5 Processes and scheduling

    Week 5 Processes and scheduling

    22問 • 11ヶ月前
    ユーザ名非公開

    Week 6 Interprocess Communication

    Week 6 Interprocess Communication

    ユーザ名非公開 · 22問 · 11ヶ月前

    Week 6 Interprocess Communication

    Week 6 Interprocess Communication

    22問 • 11ヶ月前
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    ユーザ名非公開 · 13問 · 11ヶ月前

    Week 7 File system

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    13問 • 11ヶ月前
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    10問 • 11ヶ月前
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    ユーザ名非公開 · 8問 · 9ヶ月前

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    問題一覧

  • 1

    What is the primary characteristic of Main Memory (RAM) described in the lecture?

    It is predominantly volatile, losing values when the system is powered down.

  • 2

    If memory addresses in instructions were always physical addresses, why would multiprogramming be difficult?

    User programs could interfere with each other or the operating system.

  • 3

    What abstraction does an "address space" provide for memory?

    A large, private memory for each process, addressed from 0 to some limit.

  • 4

    How is Virtual Memory typically implemented on modern systems?

    By paging, where the virtual address space is divided into fixed-size pages.

  • 5

    What is the role of the Memory Management Unit (MMU)?

    To translate virtual addresses to physical addresses.

  • 6

    What happens if the MMU encounters an address in an "unmapped page"?

    It raises a "page fault" interrupt, passing control to the OS.

  • 7

    Which component stores the mapping between pages in a process's virtual address space and frames in physical memory?

    The Page Table

  • 8

    During normal operation (when a page is present in memory), how does the MMU handle virtual address translation?

    It transparently maps the virtual address to the physical address in hardware

  • 9

    When a page fault occurs, what is the first step the OS must typically do?

    Find an available frame in physical memory to hold the accessed virtual memory.

  • 10

    If an evicted page is "dirty" during page fault handling, what must happen?

    Its data must be backed up to disk.

  • 11

    What is the purpose of Page Replacement Algorithms (PRAs)?

    To choose which page to evict from a physical frame when a page fault occurs and no free frames are available.

  • 12

    Why is a Translation Lookaside Buffer (TLB) used in the MMU?

    To cache recently used virtual-to-physical address translations for speed.

  • 13

    Main memory (RAM) is a volatile storage, meaning its values are lost when the system is powered down

    True

  • 14

    If programs directly used physical addresses, it would simplify multiprogramming by allowing easier memory sharing between processes.

    False

  • 15

    An address space provides an abstraction where each process appears to have a large, private memory, isolated from other processes.

    True

  • 16

    Virtual memory is typically implemented by dividing the virtual address space into variable-sized "segments."

    False

  • 17

    The Memory Management Unit (MMU) is a software component responsible for translating virtual addresses to physical addresses.

    False

  • 18

    A "page fault" occurs when a virtual page is successfully mapped to a physical memory frame.

    False

  • 19

    Each process has its own page table, which maps its virtual pages to physical memory frames.

    True

  • 20

    During normal virtual address translation (when a page is present), the operating system is heavily involved in every address lookup.

    False

  • 21

    If a page is "dirty," it means it has been modified since it was loaded into memory from disk.

    True

  • 22

    The Translation Lookaside Buffer (TLB) is an optimization that helps speed up virtual address translation by caching frequently used page table entries.

    True