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Recent questions tagged operating-system
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301
DRDO CSE 2022 Paper 2 | Question: 7
_________ is an $\text{IEEE 1003.1C}$ standard $\text{API}$ for thread creation and synchronization in operating system.
admin
asked
in
Operating System
Dec 15, 2022
by
admin
314
views
drdocse-2022-paper2
operating-system
threads
2-marks
fill-in-the-blanks
2
votes
1
answer
302
DRDO CSE 2022 Paper 2 | Question: 8
If the disk head is initially located at track $32,$ find the number of disk moves required with First Come First Serve $\text{(FCFS)}$ scheduling criteria if the disk queue of $\text{I/O}$ blocks requests are: $90 \; 77 \; 24 \; 104 \; 55 \; 87.$
admin
asked
in
Operating System
Dec 15, 2022
by
admin
522
views
drdocse-2022-paper2
operating-system
disk-scheduling
5-marks
descriptive
1
vote
1
answer
303
DRDO CSE 2022 Paper 2 | Question: 9
Assume that in a certain computer, the virtual addresses are $64$-bit long, the physical addresses are $48$-bit long, and the memory is word-addressable. The page size is $16 \mathrm{KB}$ and the word size is $8 \mathrm{B}$. ... transalation path has $256$ valid entries. At most how many distinct virtual addresses can be translated without any $\text{TLB}$ miss?
admin
asked
in
Operating System
Dec 15, 2022
by
admin
362
views
drdocse-2022-paper2
operating-system
translation-lookaside-buffer
5-marks
descriptive
1
vote
3
answers
304
Unacademy AIMT question on Fork()
Given the following piece of code : Main() { Int child = fork(); Int c = 5; if (child == 5) { C + = 5; } Else { Child = fork(); C + = 5; } } What are the different values of the variable c? First of all checking child == ... a pseudocode as some of the syntaxes are wrong. Also I am getting the answer as 10,10,10. Given answer is 20,10,15. Can someone please check?
Sunnidhya Roy
asked
in
Operating System
Dec 14, 2022
by
Sunnidhya Roy
1.1k
views
operating-system
fork-system-call
programming-in-c
0
votes
1
answer
305
Self Doubt | Logical Address | Virtual Address | Virtual Memory
Can anyone explain how are these two things connected (i) Virtual Memory (part of HDD, acting as RAM) and (ii) Virtual Address Space (Logical Address, generated by CPU during compilation), and where exactly is this Logical Address stored?
Souvik33
asked
in
Others
Dec 12, 2022
by
Souvik33
443
views
operating-system
memory-management
virtual-memory
paging
co-and-architecture
self-doubt
2
votes
0
answers
306
Split Phase | Self-Doubt | COA
How is split phase implemented in the hardware? For common register access between two stages, how is one clock cycle (Giving half a clock cycle to each of the stages) enough to satisfy work for both stages? Any reference to standard resources will also help.
DebRC
asked
in
CO and Architecture
Dec 6, 2022
by
DebRC
481
views
co-and-architecture
operand-forwarding
operating-system
self-doubt
split-phase
1
vote
2
answers
307
#MadeEasy
consider a system having 22 resources of the same type. These resources are shared by 4 processes P, Q, R, and S having peak demands of 3,6, a, and b respectively. How many ordered pairs (a,b) are possible, such that the system is deadlock free?
Dknights
asked
in
Operating System
Dec 5, 2022
by
Dknights
809
views
operating-system
resource-allocation
made-easy-test-series
deadlock-prevention-avoidance-detection
2
votes
1
answer
308
unacademy aimt 2023 mock 1
A floppy disk has 40 cylinders. When storing a file on the floppy disk, the operating system (probably the floppy device driver) often attempts to put the blocks of the file in cylinders that are close to one another (if this can be ... seconds per cylinder moved, the rotational latency is 20 milli-seconds on average, and the transfer time is 15 milliseconds per block?
sat0503
asked
in
Operating System
Dec 4, 2022
by
sat0503
431
views
operating-system
file-system
normal
unacademy-test-series
2
votes
1
answer
309
Ace academy handout
Please solve and explain this question, like explaining to a 2nd-grade student. Answer is 128 KB, for verification.
joleyasarthak
asked
in
Operating System
Dec 4, 2022
by
joleyasarthak
369
views
operating-system
memory-management
paging
2
votes
1
answer
310
Logical and Physical Address Generation | OS
MSQ Consider execution of the following C code for different cases: printf( %d ,&a); Consider the following statements. Which among these are TRUE: Will print Logical Address in case of Local Variables, as they are static ... runtime, like malloc() Will print Logical Address in case of variables Dynamically allocated during the runtime, like malloc()
Souvik33
asked
in
Operating System
Dec 3, 2022
by
Souvik33
495
views
memory-management
paging
co-and-architecture
operating-system
multiple-selects
4
votes
1
answer
311
Multilevel paging
The below question is from made easy test series: Consider a 32 bit virtual address as follows: 10 8 6 8 P1 P2 P3 Offset System uses 3 level paging and the bits for the respective levels are as indicated above. Then the size of page table for a process which requires 256 KB of ... $\frac{2^{8}} {2} $ = 2$^{7}$ pages. I don't know what I am getting wrong. Please correct me.
Chaitanya Kale
asked
in
Operating System
Dec 3, 2022
by
Chaitanya Kale
1.3k
views
paging
multilevel-paging
operating-system
made-easy-test-series
1
vote
1
answer
312
paging
Can anyone diagrammatically explain what is the difference between Page size vs Page table entry size in a page table?
Bishes
asked
in
Operating System
Dec 3, 2022
by
Bishes
1.0k
views
paging
operating-system
virtual-memory
3
votes
2
answers
313
I/O Modes | Process State Transition | COA & OS
MSQ A ‘Running’ process is surely put into ‘Blocked/Wait’ state during while requesting for an I/O, in which of the following I/O modes? Synchronous I/O Asynchronous I/O Interrupt Driven I/O DMA
Souvik33
asked
in
CO and Architecture
Dec 2, 2022
by
Souvik33
752
views
operating-system
process-scheduling
co-and-architecture
dma
interrupts
input-output
multiple-selects
1
vote
1
answer
314
Calculate the effective access time.
A demand paging system provides a TLB (15 ns access time), cache memory (25 ns access time), main memory (75 ns access time, NOT including the cache miss ) and 5 ms to service a page fault. The page table is found in the TLB 70% ... memory location is found in the cache 70% of the time and in main memory 20% of the time. Calculate the effective access time.
hoangminh
asked
in
Operating System
Nov 30, 2022
by
hoangminh
2.4k
views
operating-system
effective-memory-access
1
vote
0
answers
315
Fork System Call and Threads | OS | MSQ
MSQ Consider the following statements, which one of the following is/are TRUE In fork() system call, child process inherits all the open file descriptors of parent process In fork() system call, child process copies the code of the ... system call, child process shares the code of the parent process User level threads shares the code segment of the process
Souvik33
asked
in
Operating System
Nov 28, 2022
by
Souvik33
779
views
operating-system
fork-system-call
unix
process-and-threads
threads
multiple-selects
0
votes
1
answer
316
OS Self doubt(Memory management)
] Our CPU is currently idle and the current time is labeled time 0. Four processes arrive to the ready queue at the following times and with the following required run time: See image for Ariival time and Process info Simulate ... decision, and calculate the turnaround time for each process. Also calculate the average turnaround time for each scheduling algorithm.
legacy
asked
in
Operating System
Nov 27, 2022
by
legacy
450
views
operating-system
process-scheduling
1
vote
2
answers
317
OS Self doubt Memory management
Suppose that a machine has 42-bit virtual addresses and 32-bit physical addresses. {a} How much RAM can the machine support (each byte of RAM must be addressable)? {b} What is the largest virtual address space that can be supported for a process? ... each second-level page table? {f} What is the advantage of using a two-level page table over single-level page table?
legacy
asked
in
Operating System
Nov 26, 2022
by
legacy
844
views
operating-system
memory-management
virtual-memory
3
votes
1
answer
318
Operating System | Round Robin | Preemption & Context Switch
Suppose only a process P1 is executing, using Round Robin scheduling. After the time slice expires, the same process comes back into execution. This could be considered as: (Time Slice of RR is smaller than burst of P1) Only preemption Only context switch Both preemption and context switch None
Souvik33
asked
in
Operating System
Nov 25, 2022
by
Souvik33
790
views
round-robin-scheduling
operating-system
context-switch
0
votes
0
answers
319
Concurrent program
Consider the concurrent program: x:=1; cobegin x:= x + x + 1|| x:= x + 2 coend; Reading and writing of a vairable is atomic, but evaluation of an expression is not atomic. The sum of possible values of variable x at the end of execution of the program is ___. The above question ... + 2 = 3 now again running x = 1+ x + 1 and now substituting the value of x as 3 x = 1 + 3 + 1 = 5
Chaitanya Kale
asked
in
Operating System
Nov 22, 2022
by
Chaitanya Kale
363
views
operating-system
concurrency
programming
2
votes
1
answer
320
Gate Wallah Study material
Please help with the minimum value. Problem is from the gate wallah study handout.
joleyasarthak
asked
in
Operating System
Nov 21, 2022
by
joleyasarthak
943
views
operating-system
concurrency
preparation
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