Recent questions and answers in Operating System - GATE CSE Doubts

0 votes

1 answer

#made esay test
why bonded wait is possible

answered 4 hours ago in Operating System by Vimal Patel (387 points) | 3 views

0 votes

0 answers

RBR Test Series

asked 1 day ago in Operating System by Priyansh Singh (122 points) | 10 views

0 votes

0 answers

Made easy test series : Process scheduling
Consider the following set of processes that need to be scheduled on a single CPU. Operating system uses preemptive shortest remaining time first algorithm. (Ties are broken by using FCFS) What is the average waiting time (ms) and ... have their own devices, consider only CPU times as burst time). Can someone plz provide answer for above question.

asked 2 days ago in Operating System by vishal burnwal (57 points) | 13 views

0 votes

0 answers

ACE MOCK TEST
Consider a system having 10 IO bound jobs and 1 CPU bound job. If IO bound job issues an IO request once for every ms of CPU computation and that each IO request takes 10 ms. If context-switch overhead is 0.1ms, using round robin scheduling with a time quantum of 10 ms, CPU efficiency = ___ [closed]

asked 3 days ago in Operating System by tamaldeepmaity (8 points) | 8 views

0 votes

0 answers

Fork system call doubt
How many total processes will be spawned after executing following program? int main() { fork() || fork() && fork() ; } I am getting 5...please someone verify.. But Here it is given 7 My attempt- Each leaf node corresponds to a process I firstly performed ... A=0 then B will not be evaluated and results in 0 In A||B if A=1 then B will not be evaluated and results 1.

asked 4 days ago in Operating System by Verma Ashish (386 points) | 12 views

0 votes

0 answers

MadeEasyTestSeries operating_system
Somebody, please solve this question.

asked 4 days ago in Operating System by Rudr Pawan (688 points) | 11 views

0 votes

0 answers

Ravindrababu ravula test series : File system
Consider a file currently consisting of 100 blocks. Assume that the file-control block (and the index block, in the case of indexed allocation) is already in memory. In the contiguous-allocation case, assume that there is no room to grow at the beginning but there ... 1, 1 2. 101, 52, 1 3. 1, 3, 1 4. 198, 1,0 Please give explaination for above question.

asked 5 days ago in Operating System by vishal burnwal (57 points) | 11 views

0 votes

0 answers

OS ace testseries
What should be the answer C or D?

asked 6 days ago in Operating System by Rajesh Panwar (40 points) | 15 views

0 votes

0 answers

Made easy test series : Threads
Consider the following statements given below: S1 : User-level thread switching does not require context switching. S2 : Virtual memory increases the context switching overhead. S3 : Every thread has its own registers and stack but not program counter. ... is that how S1 is true because even user level thread switching requires context switching. Am i right or wrong?

asked Dec 4 in Operating System by vishal burnwal (57 points) | 9 views

0 votes

0 answers

ACE GATE Mock Test 11 Q45 Scheduling Algo
For this type questions is it mandatory to solve all 4 and check or any shortcuts/tricks can be used?

asked Dec 4 in Operating System by DukeThunders (288 points) | 9 views

0 votes

0 answers

ACE GATE Mock Test 11 Q20 Fork()

asked Dec 4 in Operating System by DukeThunders (288 points) | 14 views

0 votes

0 answers

self doubt operating system context switching
Is there conext switching in function call? e.g – int main(){ …. …. A(); … } void A(){ …. }

asked Dec 4 in Operating System by Shubhm (23 points) | 16 views

0 votes

0 answers

#selfdoubt,cpu scheduling,processes
for processes involving cpu and io bursts. waiting time=turaround time -(cpu burst+io burst time) or only waiting time=turaround time -(cpu burst time). i have seen questions implementing first formula while in others second formula too is used. which one to follow?

asked Dec 3 in Operating System by Harshitkmr (6 points) | 3 views

0 votes

0 answers

ACE Test Series OS CSIT_P_28 Q16: Privilege Instructions

asked Nov 30 in Operating System by DukeThunders (288 points) | 13 views

0 votes

0 answers

Applied Test Series
Starvation freedom implies Bounded waiting. Bounded waiting implies Starvation Freedom. Ans given, both are false. Can anyone explain why ??

asked Nov 27 in Operating System by MRINMOY_HALDER (37 points) | 15 views

0 votes

0 answers

self doubt-demand paging and virtual memory
1>Can demand paging exists without virtual memery? 2>And is virtual memory of any use without demand paging?

asked Nov 26 in Operating System by Doraemon (89 points) | 10 views

0 votes

1 answer

ACE Test Series Test 50 OS: Fork
How to solve this? Thank you.

answered Nov 25 in Operating System by amit166 (113 points) | 100 views

0 votes

1 answer

GATE GURU:DSA
What is the worst case time complexity of the following recurrence relation? T(n)=T(n/2)+T(n/4)+T(n/8)+n 1. O($logn$) 2. O($n$) 3. O($nlogn$) 4. O($n^2$)

answered Nov 25 in Operating System by Verma Ashish (386 points) | 21 views

+1 vote

1 answer

ME testseries
(A) Solution is correct. (B) Both readers and writers may enter into database at same time. (C) deadlock may occur. (D) both B and C are right. Answer given is B. reasoning is clear that because there is not mutual exclsion there can't be any deadlock. But ... signal $db$. Now R2 runs and waits on $db$. But cant proceed. Now no writer process can access db. So deadlock is possible.

answered Nov 25 in Operating System by Winner (69 points) | 44 views

0 votes

0 answers

Testbook Test Series (Finding EMAT)
The average time to service a page fault is 20 milliseconds. Hit ratio is 95% while the memory access time is 2 microseconds. What is the effective memory access time in milliseconds (correct up to 4 decimal places)? My Solution : Hit ratio = 0.95, Miss ratio = $0.05$ Page ... $\text{EMAT} = 1003.8 \mu s = 1.0038 \ ms$ but the given is $1.0020 \ ms$

asked Nov 24 in Operating System by Mk Utkarsh (302 points) | 21 views

0 votes

1 answer

ACE Operating Systems CS_GATE_2020_42
Can someone please tell the method to solve this question Thank you in advance

answered Nov 23 in Operating System by Mk Utkarsh (302 points) | 78 views

+1 vote

0 answers

Gate Forum: OS 2020
Shouldn’t the answer be $66$? But this is the answer provided

asked Nov 23 in Operating System by Debapaul (308 points) | 24 views

0 votes

1 answer

ACE test series OS Semaphores
In this deadlock occurs right? Anyone please clarify.

answered Nov 20 in Operating System by amit166 (113 points) | 20 views

0 votes

0 answers

Self doubt: operating system
If there is Deadlock in the system of processes then what can we say about bounded waiting and progress?? I go through https://gateoverflow.in/38610/does-deadlock-imply-no-bounded-waiting-progress-both-these But i didn't understand how bounded waiting is possible if there is Deadlock??

asked Nov 18 in Operating System by Verma Ashish (386 points) | 14 views

0 votes

0 answers

SELF DOUBT MADEEASY PREVIOUS YEAR
https://gateoverflow.in/220628/madeeasy-test-series-operating-system-memory-management WITH RESPECT TO THIS QUESTION IF THE QUESTION IS LIKE THAT Consider a machine with byte addressable memory 32 bits virtual addresses, 32 bits physical addresses and 4 KB page ... along with page of second leve page table is ________ KB THEN WHAT WILL BE ANSWER NO CHANGE OR 8 KB?

asked Nov 17 in Operating System by eyeamgj (17 points) | 16 views

0 votes

0 answers

self-doubt(preemtive,non-preemptive and I/O bound or CPU bound)

asked Nov 16 in Operating System by Doraemon (89 points) | 13 views

0 votes

1 answer

Consider a system having 30 instances of resources R

answered Nov 14 in Operating System by Satbir (3.7k points) | 16 views

0 votes

1 answer

Operating system self doubt
please help me to fill these table with YES/NO SYNCHRONIZATION MECHANISMS DISABLE INTERRUPTS LOCK VARIABLE STRICT ALTERATION PETERSON SOLUTION TEST AND SET LOCK INSTRUCTION SLEEP AND WAKE UP BINARY SEMAPHORE COUNTING SEMAPHORE MUTUAL EXCLUSION IS ... WAITING PROBLEM ? NO YES YES YES NO SOFTWARE OR HARDWARE BASED IMPLEMENATION ? HARDWARE SOFTWARE SOFTWARE SOFTWARE

answered Nov 13 in Operating System by Shaik Masthan (493 points) | 32 views

0 votes

0 answers

ME test series: OS
My doubt here is can we not use medium term scheduler to swap process in vritual memory to avoid thrashing ?

asked Nov 13 in Operating System by kalra05 (19 points) | 17 views

0 votes

0 answers

TLB with demand paging
Formula 1 EAT with page fault in demand paging = Page fault rate * {Effective Access Time without page fault + Page fault service time} + (1 - Page fault rate) * {Effective Access time without page fault} Where, Effective Access Time without ... while solving questions ? I am getting confused when to apply which formula. According to me we should always use formula 1.

asked Nov 13 in Operating System by Satbir (3.7k points) | 30 views

0 votes

0 answers

Ace grand subject test 42 Operating system
can some one tell the method to solve the below question? Thank you [closed]

asked Nov 11 in Operating System by Pratyush Priyam Kuan (392 points) | 14 views

0 votes

0 answers

virtually indexed physically tagged cache
Can someone please explain the concept behind virtually indexed and physically tagged cache ?

asked Nov 10 in Operating System by Pratyush Priyam Kuan (392 points) | 10 views

0 votes

0 answers

udacity(os lecture)
what is meaning of statement page table entries not cached .my approach to solve this question total cycle=1(computing V.A)+3*10(3 level page table)+0.9(1)+0.1(1+10) (cache miss) am i correct?????

asked Nov 10 in Operating System by BASANT KUMAR (11 points) | 12 views

0 votes

0 answers

Applied gate test series- OS
3 processes $P_0,P_1,P_2$ scheduled as per SRTF algo. $P_0$ is known to be scheduled first and when $P_0$ is running $5$ units of time the process $P_2$ arrived. The process $P_2$ runs for $2$ units of time and got preempted, the process $P_1$ has arrived and completed running in $4$ units of time. Then the minimum burst time of $P_0$ is _____ ? [closed]

asked Nov 9 in Operating System by Satbir (3.7k points) | 5 views

0 votes

0 answers

APPLIED GATE test series -OS
Consider the following table. Process Arrival Time(in sec) Burst time (in sec) $P_1$ $0.0$ $8$ $P_2$ $0.4$ $4$ $P_3$ $1.0$ $1$ Suppose that a fourth process $P_4$ enters the system at time $7.6$ sec and needs $6$ ... queue followed by one process(if available) from the batch queue etc. Assume there is no context switch delay. What will be the average turnaround time ? [closed]

asked Nov 9 in Operating System by Satbir (3.7k points) | 8 views

0 votes

1 answer

Concept behind Re-entrant and non re- entrant lock (self -doubt)

answered Nov 9 in Operating System by GAITONDE (1.6k points) | 21 views

0 votes

2 answers

Operating System Test Series
Consider the following code snippet: if(fork() || fork()) { fork(); } if(fork() && fork()) { fork(); fork(); } printf("GATE 2019"); How many times GATE 2019 printed?

answered Nov 9 in Operating System by aditi19 (54 points) | 107 views

0 votes

0 answers

GRADEUP Quiz Test&Set
Consider a process P' tries to acquire a lock using the test-and-set instruction as following. while (Test-and-Set (lock)); If the lock is busy (some other process acquired the lock) and all interrupts are disabled then which of the following is ... P blocks waiting for the lock to be available Processor P wastes processor and memory cycles both 1 and 2 neither 1 nor 2

asked Nov 8 in Operating System by aditi19 (54 points) | 14 views

0 votes

1 answer

ACE Test (OS)
A magnetic disk contains $16$ platters , each with $2 $ surfaces., $1K$ tracks per surface. $2K$ sectors per track, $2048B$ sector capacity. Number of bits used Disk Addressing_________

answered Nov 8 in Operating System by pranay562 (666 points) | 16 views

0 votes

2 answers

Operating System (ACE)
A disk pack contains $10$ platters each with two recording surfaces. Each surface contains $50$ tracks. Each track contains $200$ sectors with $1$ sector capacity $2KB.$ The capacity of one cylinder is _________ They havenot taken number of tracks. But why? Isnot cylinder contains tracks?

answered Nov 8 in Operating System by chandrikabhuyan8 (117 points) | 30 views

To see more, click for all the questions in this category.

Recent questions and answers in Operating System

2,313 questions

1,294 answers

6,586 comments

89,719 users