Recent questions tagged virtual-memory / GATE Overflow for GATE CSE

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61

Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 8 (Page No. 254)
The Intel $8086$ processor did not have an MMU or support virtual memory. Nevertheless, some companies sold systems that contained an unmodified $8086$ CPU and did paging. Make an educated guess as to how they did it. (Hint: Think about the logical location of the MMU.)

The Intel $8086$ processor did not have an MMU or support virtual memory. Nevertheless, some companies sold systems that contained an unmodified $8086$ CPU and did paging...

admin

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admin asked Oct 26, 2019

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0 answers

62

Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 7 (Page No. 254)
Using the page table of Fig. $3-9,$ give the physical address corresponding to each of the following virtual addresses: $20$ $4100$ $8300$

Using the page table of Fig. $3-9,$ give the physical address corresponding to each of the following virtual addresses:$20$$4100$$8300$

admin

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admin asked Oct 26, 2019

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63

Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 6 (Page No. 254)
For each of the following decimal virtual addresses, compute the virtual page number and offset for a $4-KB$ page and for an $8 KB$ page$:20000, 32768, 60000.$

For each of the following decimal virtual addresses, compute the virtual page number and offset for a $4-KB$ page and for an $8 KB$ page$:20000, 32768, 60000.$

admin

342 views

admin asked Oct 26, 2019

1 votes

1 answer

64

Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 5 (Page No. 254)
What is the difference between a physical address and a virtual address?

What is the difference between a physical address and a virtual address?

admin

466 views

admin asked Oct 25, 2019

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2 answers

65

Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 15 (Page No. 82)
Consider a computer system that has cache memory, main memory (RAM) and disk, and an operating system that uses virtual memory. It takes $1$ nsec to access a word from the cache, $10$ nsec to access a word from the RAM, and ... and main memory hit rate (after a cache miss) is $99\%$, what is the average time to access a word?

Consider a computer system that has cache memory, main memory (RAM) and disk, and an operating system that uses virtual memory. It takes $1$ nsec to access a word from th...

admin

1.7k views

admin asked Oct 23, 2019

3 votes

1 answer

66

Self Doubt on Page Fault
To calculate EMAT in case of page fault we used: EMAT= page fault rate*(page fault service time) + (1-page fault rate)*(memory access time) My doubt is: In case of NO PAGE FAULT, why we considered only one memory access time . Why ... considered (VA -> PA time) + memory access time. Then why not we consider address translation time in questions involving only pagefault?

To calculate EMAT in case of page fault we used:EMAT= page fault rate*(page fault service time) + (1-page fault rate)*(memory access time)My doubt is:In case of NO PAGE ...

tp21

1.1k views

tp21 asked Sep 22, 2019

3 votes

1 answer

67

UGC NET CSE | June 2019 | Part 2 | Question: 47
The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by page size physical size of memory the instruction set architecture number of processes in memory

The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined bypage sizephysical size of memorythe instruct...

Arjun

1.9k views

Arjun asked Jul 2, 2019

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1 answer

68

Stallings Book Doubt-Process
Which part of the process image forms the logical address space that is used in paging?

Which part of the process image forms the logical address space that is used in paging?

aditi19

508 views

aditi19 asked May 26, 2019

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0 answers

69

Galvin Edition 9 Exercise 9 Question 37 (Page No. 456)
The slab-allocation algorithm uses a separate cache for each different object type. Assuming there is one cache per object type, explain why this scheme doesn’t scale well with multiple CPUs. What could be done to address this scalability issue?

The slab-allocation algorithm uses a separate cache for each different object type. Assuming there is one cache per object type, explain why this scheme doesn’t scale w...

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