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Recent questions tagged memory-management

2 votes

1 answer

361

Test by Bikram | Mock GATE | Test 2 | Question: 16
While designing a memory management subsystem, a computer hardware manufacturer must decide whether to utilize a partitioning, segmentation, or demand paging strategy. Which of the following statements is/are correct regarding the scenario ? I. Partitioning ... fragmentation. I only I and II only I and III only I, II, and III all are correct

Bikram asked in GATE Jan 24, 2017

by Bikram

593 views

4 votes

1 answer

362

Demand Paging
Consider a demand-paging system with a paging disk that has 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. Thus, each memory reference ... , 10 percent (or 2 percent of the total) cause page faults. What is the effective memory access time in milliseconds?

biranchi asked in Operating System Jan 22, 2017

9.7k views

1 vote

0 answers

363

MemoryManagment Os

monty asked in Operating System Jan 18, 2017

by monty

826 views

1 vote

0 answers

364

MEMORY ALLOCATION
HOW STATIC MEMORY ALLOCATION MANAGES FUNCTIONS CALL? WHERE ARE ACTIVATION RECORDS STORED IN STATIC MEMORY ALLOCATION?

sushmita asked in Compiler Design Jan 18, 2017

603 views

3 votes

1 answer

365

MadeEasy Test Series: Operating System - Memory Management
Consider a system using segmented paging architecture.The segment is divided into 1K pages.Each page having 128 entries.Segment table is divided into 512 pages and each page having 1024 entries.The size of page table entries are 2 ... answer given is 1024 while I am getting 2048. Can anyone provide a detailed explanation if I am wrong?

sourojit asked in Operating System Dec 19, 2016

1.1k views

0 votes

2 answers

366

Madeeasy test series
In a virtual memory system, size of virtual address is 40 bit, size of physical address is 32 bit, page size is 8 kb and size of each page table entry is 40 bit. Assume the main memory to be Byte addressable. The maximum number of bits that can be used for storing protection and other information in each page table entry are ___

gautamcse27 asked in Operating System Dec 15, 2016

1.4k views

5 votes

1 answer

367

find the page table size
Consider the following memory organization of a processor. The virtual address is 40 bits, the physical address is 32 bits, the page size is 8 KB. The processor has a 4-way set associative 128-entry TLB i.e. each way has 32 sets. Each page table entry is ... way set associative 32 KB L1 cache with line size of 64 bytes. What is the total size of the page table? 8MB 10MB 2MB

Akriti sood asked in CO and Architecture Dec 14, 2016

4.8k views

2 votes

1 answer

368

Memory Management
Main memory is partition into Chunks in I. Simple Paging. II. Virtual memory Paging III. Simple segmentation. IV. Virtual memory segmentation a) I & II b) I & III c) I, II and III d) All Ans::(a) is it Correct..?

Meghashyam Sujay asked in Operating System Dec 12, 2016

by Meghashyam Sujay

2.7k views

0 votes

1 answer

369

Made easy booklet - Memory management
Given following data, find average access time. Please explain the solution.

agoh asked in Operating System Dec 11, 2016

by agoh

517 views

0 votes

1 answer

370

MadeEasy Test Series: Operating System - Memory Management

ankush_gate asked in Operating System Dec 6, 2016

554 views

–1 vote

0 answers

371

OS Memory Management[Self Dobt]
Consider the following program:- int a=5; printf(&a);//print address of a int b=malloc(); printf(&b); //print address of b Will it print logical address in both cases?If yes,then does it mean that variables are ... memory and then copied to man memory when required?I was under impression that this memory allocation happens in main meory.Please clarify.

rahul sharma 5 asked in Operating System Dec 6, 2016

by rahul sharma 5

229 views

1 vote

1 answer

372

os question
Consider the following statements: 1. Paging suffers from internal fragmentation and segmentation suffers from external fragmentation. 2. FIFO replacement policy ignores locality of reference. 3. The essential content(s) in each entry of page table are both virtual page number and page ... Which of the above statements are correct? Only 3 and 4 Only 2 and 3 Only 1 and 4 Only 1 and 2

Vishal Goyal asked in Operating System Dec 4, 2016

by Vishal Goyal

3.6k views

0 votes

1 answer

373

MadeEasy Test Series: Operating System - Memory Management
Suppose that you wish to design a virtual memory system with the following characteristics: Size of page table entry is 4 bytes. Each page table must fit into a single page frame. System must be able to support virtual ... scheme with no more than 2 levels of page tables. What is the minimum page size that the system must have?

Vishal Goyal asked in Operating System Dec 4, 2016

by Vishal Goyal

2.6k views

0 votes

0 answers

374

dout os
A multi-user, multiprocessing operating system can not be implemented on hardware that does not support atleast 2 modes of CPU execution. can anyone explane why is this statement true whydo we need two modes for implemening multiuser is it for scheduleing

Vishal Goyal asked in Operating System Dec 2, 2016

by Vishal Goyal

342 views

0 votes

2 answers

375

dout os
While switching context from process A to process B, operating system does not change the address translation table. why is this statement false give explanation

Vishal Goyal asked in Operating System Dec 2, 2016

by Vishal Goyal

1.6k views

0 votes

3 answers

376

VIrtual Memory
A memory system contians a cache, a primary memory and a secondary memory. The access time of cache is 5ns and it has 80% hit rate. The access time of main memory is 100ns and it has 99.5% hit rate.The access time of virtual memory is 10ms. What is the average access time of the hierarchy? (A) 10000ns (B) 50099.5ns (C) 10024ns (D) None of these

Rakesh K asked in Operating System Nov 27, 2016

3.2k views

1 vote

0 answers

377

Urgent- Memory management
Can someone please tell me the resource to study memory management. I am finding difficulty to solve the numerical on multilevel paging and segmentation.

cse7 asked in Operating System Nov 23, 2016

by cse7

228 views

3 votes

1 answer

378

thor asked in Operating System Nov 23, 2016

by thor

472 views

2 votes

2 answers

379

memory management
True or False S1: In Fixed partition we have both internal and external fragmentation S2: In variable partition, we have only external fragmentation

cse7 asked in Operating System Nov 22, 2016

by cse7

1.0k views

1 vote

1 answer

380

size of cache
A 2-way set associative write back cache with true LRU replacement requires 15 * 29 bits to implement its tag store per set (including bits for valid, dirty and LRU). The cache is virtually indexed, physically tagged. The virtual address space is 1 MB, page size is 2 KB ... and is byte-addressable. What is the maximum size of the data store of the cache in bytes? 9 KB 10 KB 12 KB 8 KB

Akriti sood asked in CO and Architecture Nov 8, 2016

1.3k views

0 votes

0 answers

381

Memory Management
How to solve this?

Arijit 2 asked in Operating System Nov 5, 2016

319 views

7 votes

1 answer

382

GateForum Study Material
Given memory partitions of 100kB, 700kB, 500kB, 200kB, 100kB (in order) and requests for processes of size 112kB, 516kB, 180kB, 320kB, 190kB (in order) are placed. According to which of the following algorithms(s) all requests can be successfully placed in memory? A) First Fit B) Best Fit C) Both First Fit and Worst Fit D) Best Fit and Worst Fit

Pratyush Madhukar asked in Operating System Oct 26, 2016

by Pratyush Madhukar

4.4k views

0 votes

2 answers

383

#self doubt
Is page offset size always equal to the frame offset?? plzz explain .

Aman Jha asked in Operating System Oct 26, 2016

487 views

2 votes

2 answers

384

Self Doubt
Q : In variable allocation without compaction strategy of memory allocation , can we allocate the memory space to a process arbitrarily anywhere within the free space..I have a doubt on this since the allocation should comply with the standard methods like best ... I m facing this doubt on the question having link : https://gateoverflow.in/2747/gate1996_2-18 Plz explain someone..

Habibkhan asked in Operating System Oct 25, 2016

1.1k views

1 vote

1 answer

385

Os+ disk+ntpel question
Disk cache have cache access not in heiracrchially manner by default?? I am getting 76 as answer

Rahul Jain25 asked in Operating System Oct 25, 2016

by Rahul Jain25

486 views

0 votes

1 answer

386

Self Doubt
Can someone make me clear whether segmentation method of memory allocation is free from internal and external fragmentation.? Also plz give valid explanation in support of your answer.

Habibkhan asked in Operating System Oct 25, 2016

658 views

1 vote

1 answer

387

Rahul Jain25 asked in Unknown Category Oct 24, 2016

by Rahul Jain25

631 views

1 vote

1 answer

388

Memory
This is physically addressed so We have to search in TLB first but my question is if it is a HIT in TLB why do we need to search in Cache It should be only TLB(hit)*{Tlb access time + memory access time} and if there is miss in TLB then we look in the cache and Secondary meory Am I correct or Something is missing???

bad_engineer asked in CO and Architecture Oct 19, 2016

by bad_engineer

518 views

1 vote

2 answers

389

homework nyu
In a 32-bit machine we subdivide the virtual address into 4 segments as follows: 10-bit 8-bit 6-bit 8 bit We use a 3-level page table, such that the first 10-bit are for the first level and so on. What is the size of a page table for a process that has 256K of memory starting at address 0? (assume 2Byte per entry for all the levels)

Nishant Arora asked in Operating System Oct 18, 2016

by Nishant Arora

5.4k views

0 votes

0 answers

390

memory management
A computer system has a 36-bit virtual address space with a page size of 8K, and 4 bytes per page table entry.What is the maximum size of addressable physical memory in this system?

Nishant Arora asked in Operating System Oct 18, 2016

by Nishant Arora

683 views

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Recent questions tagged memory-management