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Abraham Silberschatz, Greg Gagne, Peter B. Galvin - Operating System Concepts-Wiley (2018), PART TWO PROCESS MANAGEMENT, Chapter 5 CPU Scheduling, Pg. 202.
Nam14
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Operating System
Apr 5, 2023
by
Nam14
514
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operating-system
process-synchronization
galvin
0
votes
0
answers
2
Galvin Edition 9 Exercise 11 Question 18 (Page No. 541)
Discuss the advantages and disadvantages of associating with remote file systems (stored on file servers) a set of failure semantics different from that associated with local file systems.
ajaysoni1924
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in
Operating System
Mar 22, 2019
by
ajaysoni1924
493
views
operating-system
galvin
descriptive
file-system
0
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0
answers
3
Galvin Edition 9 Exercise 11 Question 17 (Page No. 540)
Some systems provide file sharing by maintaining a single copy of a file. Other systems maintain several copies, one for each of the users sharing the file. Discuss the relative merits of each approach
ajaysoni1924
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in
Operating System
Mar 22, 2019
by
ajaysoni1924
487
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operating-system
galvin
descriptive
file-system
0
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0
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4
Galvin Edition 9 Exercise 11 Question 16 (Page No. 540)
Discuss the advantages and disadvantages of supporting links to files that cross mount points (that is, the file link refers to a file that is stored in a different volume).
ajaysoni1924
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in
Operating System
Mar 22, 2019
by
ajaysoni1924
346
views
operating-system
galvin
file-system
descriptive
0
votes
0
answers
5
Galvin Edition 9 Exercise 11 Question 15 (Page No. 540)
Give an example of an application that could benefit from operatingsystem support for random access to indexed files.
ajaysoni1924
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in
Operating System
Mar 22, 2019
by
ajaysoni1924
331
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operating-system
galvin
descriptive
file-system
0
votes
1
answer
6
Galvin Edition 9 Exercise 11 Question 14 (Page No. 540)
If the operating system knew that a certain application was going to access file data in a sequential manner, how could it exploit this information to improve performance?
ajaysoni1924
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in
Operating System
Mar 22, 2019
by
ajaysoni1924
1.3k
views
operating-system
galvin
io-system
descriptive
0
votes
0
answers
7
Galvin Edition 9 Exercise 11 Question 13 (Page No. 540)
Some systems automatically open a file when it is referenced for the first time and close the file when the job terminates. Discuss the advantages and disadvantages of this scheme compared with the more traditional one, where the user has to open and close the file explicitly
ajaysoni1924
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in
Operating System
Mar 22, 2019
by
ajaysoni1924
227
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operating-system
galvin
io-system
descriptive
0
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Galvin Edition 9 Exercise 11 Question 12 (Page No. 540)
Provide examples of applications that typically access files according to the following methods: • Sequential • Random
ajaysoni1924
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in
Operating System
Mar 22, 2019
by
ajaysoni1924
325
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operating-system
galvin
descriptive
file-system
0
votes
0
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9
Galvin Edition 9 Exercise 10 Question 23 (Page No. 501)
Discuss the reasons why the operating system might require accurate information on how blocks are stored on a disk. How could the operating system improve file-system performance with this knowledge ?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
439
views
galvin
operating-system
file-system
disk
0
votes
0
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10
Galvin Edition 9 Exercise 10 Question 15 (Page No. 499-500)
Compare the performance of $C-SCAN$ and $SCAN$ scheduling, assuming a uniform distribution of requests. Consider the average response time (the time between the arrival of a request and the completion of that request's ... and the effective bandwidth. How does performance depend on the relative sizes of seek time and rotational latency ?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
469
views
galvin
operating-system
disk-scheduling
descriptive
0
votes
1
answer
11
Galvin Edition 9 Exercise 10 Question 11 (Page No. 498-499)
Suppose that a disk drive has $5,000$ cylinders, numbered $0$ to $4,999$. The drive is currently serving a request at cylinder $2,150$, and the previous request was at cylinder $1,805$. The queue of pending requests, in $FIFO$ ... disk-scheduling algorithms ? $a. FCFS$ $b. SSTF$ $c. SCAN$ $d. LOOK$ $e. C-SCAN$ $f. C-LOOK$
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
618
views
galvin
operating-system
disk-scheduling
descriptive
0
votes
0
answers
12
Galvin Edition 9 Exercise 10 Question 10 (Page No. 498)
Explain why $SSDs$(Solid State Drives) often use an $FCFS$ disk-scheduling algorithm.
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
358
views
galvin
operating-system
disk-scheduling
descriptive
0
votes
1
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13
Galvin Edition 9 Exercise 10 Question 9 (Page No. 498)
None of the disk-scheduling disciplines, except $FCFS$, is truly fair (starvation may occur). a. Explain why this assertion is true. b. Describe a way to modify algorithms such as $SCAN$ to ensure fairness. c. Explain why ... more examples of circumstances in which it is important that the operating system be unfair in serving $I/O$ requests.
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
5.4k
views
galvin
operating-system
disk-scheduling
descriptive
0
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0
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14
Galvin Edition 9 Exercise 10 Question 7 (Page No. 497-498)
It is sometimes said that tape is a sequential-access medium, whereas a magnetic disk is a random-access medium. In fact, the suitability of a storage device for random access depends on the transfer size. The term streaming transfer rate ... and tape. $f$. When is a tape a random-access device, and when is it a sequential-access device ?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
476
views
galvin
operating-system
disk
descriptive
0
votes
1
answer
15
Galvin Edition 9 Exercise 10 Question 3 (Page No. 497)
Why is rotational latency usually not considered in disk scheduling ? How would you modify $SSTF$, $SCAN$, and $C-SCAN$ to include latency optimization ?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
1.5k
views
galvin
operating-system
disk-scheduling
descriptive
0
votes
0
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16
Galvin Edition 9 Exercise 10 Question 2 (Page No. 497)
Explain why $SSTF$ scheduling tends to favor middle cylinders over the innermost and outermost cylinders.
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
303
views
galvin
operating-system
disk-scheduling
descriptive
0
votes
1
answer
17
Galvin Edition 9 Exercise 10 Question 1 (Page No. 497)
Is disk scheduling, other than $FCFS$ scheduling, useful in a single-user environment ? Explain your answer.
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
1.8k
views
galvin
operating-system
disk-scheduling
descriptive
1
vote
0
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18
Galvin Edition 9 Exercise 9 Question 38 (Page No. 456)
Consider a system that allocates pages of different sizes to its processes. What are the advantages of such a paging scheme ? What modifications to the virtual memory system provide this functionality ?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
709
views
galvin
operating-system
memory-management
paging
0
votes
0
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19
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?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
290
views
galvin
operating-system
virtual-memory
descriptive
0
votes
2
answers
20
Galvin Edition 9 Exercise 9 Question 36 (Page No. 456)
A system provides support for user-level and kernel-level threads. The mapping in this system is one to one (there is a corresponding kernel thread for each user thread). Does a multithreaded process consist of $(a)$ a working set for the entire process or $(b)$ a working set for each thread ? Explain
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
733
views
galvin
operating-system
threads
descriptive
0
votes
1
answer
21
Galvin Edition 9 Exercise 9 Question 34 (Page No. 455)
Consider the parameter$\triangle$ used to define the working-set window in the working-set model. When $\triangle$ is set to a small value, what is the effect on the page-fault frequency and the number of active (non suspended) processes currently executing in the system ? What is the effect when $\triangle$ is set to a very high value ?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
1.2k
views
galvin
operating-system
virtual-memory
descriptive
1
vote
1
answer
22
Galvin Edition 9 Exercise 9 Question 33 (Page No. 455)
Is it possible for a process to have two working sets, one representing data and another representing code ? Explain.
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
1.1k
views
galvin
operating-system
virtual-memory
descriptive
0
votes
1
answer
23
Galvin Edition 9 Exercise 9 Question 32 (Page No. 455)
What is the cause of thrashing ? How does the system detect thrashing ? Once it detects thrashing, what can the system do to eliminate this problem ?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
4.8k
views
galvin
operating-system
virtual-memory
descriptive
0
votes
0
answers
24
Galvin Edition 9 Exercise 9 Question 31 (Page No. 455)
Consider a demand-paging system with a paging disk that has an average access and transfer time of $20$ milliseconds. Addresses are translated through a page table in main memory, with an access time of $1$ microsecond per memory access. ... $10$ percent (or $2$ percent of the total) cause page faults. What is the effective memory access time?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
506
views
galvin
operating-system
virtual-memory
descriptive
1
vote
0
answers
25
Galvin Edition 9 Exercise 9 Question 30 (Page No. 455)
A page-replacement algorithm should minimize the number of page faults. We can achieve this minimization by distributing heavily used pages evenly over all of memory, rather than having them compete for a small number of page frames. ... faults for an optimal page replacement strategy for the reference string in part $b$ with four page frames?
akash.dinkar12
asked
in
Operating System
Mar 22, 2019
by
akash.dinkar12
837
views
galvin
operating-system
virtual-memory
descriptive
0
votes
0
answers
26
Galvin Edition 9 Exercise 11 Question 11 (Page No. 540)
What are the advantages and disadvantages of providing mandatory locks instead of advisory locks whose use is left to users’ discretion?
ajaysoni1924
asked
in
Operating System
Mar 22, 2019
by
ajaysoni1924
411
views
operating-system
galvin
descriptive
file-system
0
votes
0
answers
27
Galvin Edition 9 Exercise 11 Question 10 (Page No. 540)
The open-file table is used to maintain information about files that are currently open. Should the operating system maintain a separate table for each user or maintain just one table that contains references to files that are ... accessed by two different programs or users, should there be separate entries in the open-file table? Explain.
ajaysoni1924
asked
in
Operating System
Mar 22, 2019
by
ajaysoni1924
364
views
operating-system
galvin
descriptive
file-system
0
votes
0
answers
28
Galvin Edition 9 Exercise 11 Question 9 (Page No. 540)
Consider a file system in which a file can be deleted and its disk space reclaimed while links to that file still exist.What problems may occur if a new file is created in the same storage area or with the same absolute path name? How can these problems be avoided?
ajaysoni1924
asked
in
Operating System
Mar 22, 2019
by
ajaysoni1924
457
views
operating-system
galvin
descriptive
file-system
0
votes
0
answers
29
Galvin Edition 9 Exercise 11 Question 8 (Page No. 539)
Researchers have suggested that, instead of having an access list associated with each file (specifying which users can access the file, and how), we should have a user control list associated with each user (specifying which files a user can access, and how). Discuss the relative merits of these two schemes.
ajaysoni1924
asked
in
Operating System
Mar 22, 2019
by
ajaysoni1924
343
views
operating-system
galvin
descriptive
file-system
0
votes
0
answers
30
Galvin Edition 9 Exercise 11 Question 7 (Page No. 539)
Consider a system that supports 5,000 users. Suppose that you want to allow 4,990 of these users to be able to access one file. a. How would you specify this protection scheme in UNIX? b. Can you suggest another protection scheme that can be used more effectively for this purpose than the scheme provided by UNIX?
ajaysoni1924
asked
in
Operating System
Mar 22, 2019
by
ajaysoni1924
296
views
operating-system
galvin
descriptive
file-system
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