Recent questions and answers in Operating System - GATE CSE Doubts

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Do process and threads (belong to that process) share same address space ? If yes, How?

asked 1 day ago in Operating System by Neelam_$ingh_222 (102 points) | 2 views

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A wait operation on a semaphore should not occur within a critical section controlled by that semaphore because:

answered 2 days ago in Operating System by user2525 (1.6k points) | 30 views

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Multilevel Feedback Queue Scheduling - Gateoverflow question

asked Aug 14 in Operating System by user2525 (1.6k points) | 12 views

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self doubt cpu scheduling
Using FCFS scheduling,if ready queue is injected with a single cpu bound process and many IO bound process,than this will lead to : 1.Less average waiting time. 2.Low Cpu utilization &better disk utilization. 3.High Cpu utilization and low disk utilization. 4.Both Low Cpu &Device utilization

asked Aug 13 in Operating System by Shivangi Parashar 2 (102 points) | 9 views

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#VirtualMemory#SelfDoubt
Suppose atleast one virtual page of every two or more process are present in the main memory.And page fault occurs then the page is chosen to replace by some page replacement policy would belong from which process?would this page belong to the page faulted process only or might belong to some other process? PS:free list is empty at the time of replacement.

asked Aug 13 in Operating System by Vishwajeet_Singh (107 points) | 2 views

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Made Easy Test Series 2019
Consider a file system with block size 4kb and disk size is 28 mb, to keep track of free block in the disk a bitmap is used. Then how many disk block required for bit map? (Answer given is 7)

asked Aug 10 in Operating System by suparna kar (102 points) | 9 views

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Memory Management
How does cpu utilization increase with increase in main memory ?

asked Aug 10 in Operating System by Lihas (102 points) | 8 views

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Operating System File Structure

asked Aug 10 in Operating System by Alakhator (355 points) | 4 views

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Operating system ace workbook memory management

asked Aug 9 in Operating System by chakri (105 points) | 10 views

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Self doubt in physical and logical address
In operating system address generated by cpu is Logical Address but generally in computer architecture address generated by cpu is Physical address ? What is the reason ? Anyone explain plz?

answered Aug 7 in Operating System by user2525 (1.6k points) | 20 views

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Operating System Semaphore
How is this option ensuring bounded waiting?

answered Aug 6 in Operating System by user2525 (1.6k points) | 20 views

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Made easy subject test - CPU scheduling
Acc. to me both FCFS and SRTF are fetching the same avg. waiting time and it is minimum compared to RR. so, it would be option D. But it is given that option D is wrong. So, what is the correct answer ?

asked Aug 5 in Operating System by user2525 (1.6k points) | 8 views

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OPERATING SYSTEM TLB AND EMAT
Can someone please explain how TLB formula is changed when other concepts like page fault and cache concepts are introduced. There is a lot of confusion and not getting clear explanations. It would be very helpful for every beginners like me. TLB #### EMAT = Ht( t ... also. ( p= page fault rate , PS= pagefault service time, c= cache access time, Hc= hit rate of cache )

asked Aug 5 in Operating System by shankargadri (102 points) | 2 views

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# operating system(memory management)
Which of the following statement is false a)with the least recently used page replacement policy when the page size is halved the number of page faults can be more than the double the original number of page faults b)the working set size is a ... used main memory may contain some pages which do not belong to the working set of any program d) none of the above

answered Aug 2 in Operating System by user2525 (1.6k points) | 9 views

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# operating system
For certain page trace starting with no page in the memory a demand paged memory system operator under the lru replacement policy results in 9 and 11 page faults when the primary memory is of 6 and 4 pages respectively when the same page trace is operated under the optimal policy the number of page faults maybe A 9 and 7 B 7 and 9 C 10 and 12 D 6 and 7

answered Aug 2 in Operating System by Vimal Patel (112 points) | 9 views

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Memory segmentation
Book says that segmentation supports user’s view of memory. But with segmentation there is a problem of fragmentation. To overcome that problem we divide segments into pages where any page can be stored into any frame. But at this point(in paged segmentation) how does user view of memory gets preserved as single segment may be scattered in different parts of memory.

asked Aug 2 in Operating System by Vimal Patel (112 points) | 4 views

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MADE EASY : OS 2020 TEST SERIES
On a system using simple segmentation, compute the physical address for each of the logical address, given the following segment table. 1 - e, 2 - b, 3 - d, 4 - c, 5 - a 1 - b, 2 - c, 3 - e, 4 - d, 5 - a 1 - c, 2 - e, 3 - d, 4 - a, 5 - b

answered Aug 1 in Operating System by user2525 (1.6k points) | 12 views

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MADE EASY: OPERATING SYSTEM TEST SERIES
Assume a page reference string with 100 length and 5 distinct page number occuring in it, what is the lower bound on the number of page fault in best case ________.

answered Aug 1 in Operating System by user2525 (1.6k points) | 10 views

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Operating systems, process synchronisation ,deadlock

answered Jul 31 in Operating System by user2525 (1.6k points) | 12 views

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1 answer

Binary semaphore

answered Jul 31 in Operating System by Hirak (1.3k points) | 27 views

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Operating System made easy2019

asked Jul 30 in Operating System by Alakhator (355 points) | 13 views

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Oerating system Made easy 2019

asked Jul 30 in Operating System by Alakhator (355 points) | 10 views

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1 answer

OS Galvin Deadlock
Please explain

answered Jul 29 in Operating System by manisha11 (110 points) | 11 views

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Operating System Made Easy 2019

asked Jul 28 in Operating System by Alakhator (355 points) | 10 views

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Effective Memory Access Time ( OS)
What is the Emat (effective memory access time) when we are given page fault rate? In gate do we have to consider whether memory access time is included in the Page fault service time or not ? where { p = page fault rate, PS = Page fault service time, m = memory access time } Option 1( ... Emat = p(PS + m) + (1-p)(m) = p(PS)+ m or Option 2: Emat = p(PS) + (1-p)(m)

asked Jul 27 in Operating System by nadeshseen (106 points) | 5 views

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#Turnaround Time
ques-->> Turnaround time TAT of a process P is (a) CT – At where CT is Completion time and AT is Arrival time (b) BT + WT where BT is Burst time and WT is Waiting time (c) (CT + BT + WT – At)/ 2 (d) All of the above i know a and b is true and c is also true?

asked Jul 26 in Operating System by Ravijha (146 points) | 5 views

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#Scheduler LTS,MTS,STS
ques--> Which of the following effects the performance of the CPU? (a) LTS (b) STS (c) MTS (d) All of the above ans is d HOW?

asked Jul 26 in Operating System by Ravijha (146 points) | 5 views

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#Process Scheduling
ques--> Process control block does not contain (a) Process ID (b) User identification number (c) Registers (d) None of the above

asked Jul 26 in Operating System by Ravijha (146 points) | 7 views

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Process states
In what circumstances is a process in running state suspended and forced to reside in the suspend queue present on the disk? Also a process which is currently in the suspend block state goes to the suspend ready state in case of an event satisfaction. How does event (I.e. completion of I/O) get satisfied if the process is in suspend block state i.e residing in the disk?

asked Jul 24 in Operating System by safikhan2000 (102 points) | 5 views

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To avoid the race condition the number of process that must be simutaneously inside the critical section

answered Jul 24 in Operating System by Sambhrant Maurya (281 points) | 14 views

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ACE ACADEMY Booklet Question.
Let us assume a disk with the rotational speed of 15000 rpm, 512 bytes per sector, 400 sectors per track and 1000 tracks on the disk, average seek time is 4ms. We want to transmit a file of size 1 Mbyte, which is stored contiguously on the disc. (a) What is ... delay in this case? (d) What is the total time to read 1 sector? (e) What is the total time to read 1 track?

asked Jul 24 in Operating System by `JEET (159 points) | 12 views

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6 answers

self doubt operating system
Is there preemption in multiprogramming os? Definition which I read - Multiprogramming Os - When a process go for I/O the CPU is allocated to other process after process leaves CPU for I/O. Multitasking Os - multiprogramming os + preemption ... my doubt is how multiprogramming os switch the process without preemption? plz clear my doubt. Has I understood wrong concept?

answered Jul 23 in Operating System by Bikram (187 points) | 22 views

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GATE CS 2013 | Question 65
Consider a hard disk with 16 recording surfaces (0-15) having 16384 cylinders (0-16383) and each cylinder contains 64 sectors (0-63). Data storage capacity in each sector is 512 bytes. Data are organized cylinder-wise and the addressing format is . A file of ... 9, 40>. What is the cylinder number of the last sector of the file, if it is stored in a contiguous manner?

asked Jul 21 in Operating System by Nihal Singh (102 points) | 2 views

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Self Doubt - Object Code, Relocation, Linkers (2-passes) and Loaders

asked Jul 19 in Operating System by ayushsomani (115 points) | 11 views

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2 answers

System call - Basics of Operating System , asked by my coaching teacher

answered Jul 17 in Operating System by srestha (247 points) | 36 views

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os ace test series

answered Jul 16 in Operating System by user2525 (1.6k points) | 20 views

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1 answer

ace test series os
Is it possible to deadlock in Peterson’s solution if yes then in which condition?

answered Jul 16 in Operating System by user2525 (1.6k points) | 8 views

+1 vote

2 answers

Made easy test series OS
Consider a file system with block size as 4 KB and disk size as 28 MB , to keep track of free block in the disk a bit map is used. Then how many disk blocks are required for bit map ? Please explain the solution .

answered Jul 15 in Operating System by Debargha Bhattacharj (1.3k points) | 15 views

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1 answer

Self Doubt - Role of Mid term Scheduler, Need of Suspend Block/Wait State, No transition from Block/Wait to Terminate

answered Jul 13 in Operating System by sakharam (111 points) | 19 views

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1 answer

Virtual Memory concept
Is there any difference between demand paging and virtual memory concept ?

answered Jul 12 in Operating System by Hirak (1.3k points) | 9 views

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