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Recent questions tagged memory-management

5 votes

2 answers

421

total address space
For a computer address,if we reduce the no of bits by 2 and if we double the addressability then total address space will be 1) Doubled 2) halved 3) Remain Same 4) None What is meant by Addressablity???

bad_engineer asked in Operating System May 1, 2016

by bad_engineer

1.1k views

41 votes

6 answers

422

GATE CSE 1992 | Question: 12-b
Let the page reference and the working set window be $c\ c\ d\ b\ c\ e\ c\ e\ a\ d\ $ and $4$, respectively. The initial working set at time $t=0$ contains the pages $\{a,d,e\}$, where $a$ ... at time $t=-2$. Determine the total number of page faults and the average number of page frames used by computing the working set at each reference.

go_editor asked in Operating System Apr 24, 2016

11.2k views

1 vote

2 answers

423

Confusion in effective memory access
Let the page fault service time be 10ms in a computer with average memory access time being 20ns. If one page fault is generated for every 10^6 memory accesses, what is the effective access time for the memory? We can solve the above ... in gate, both uses different formulae, pls explain in detail what is the difference among them, I found them as similar.

Meme Iamam asked in Operating System Mar 28, 2016

1.5k views

0 votes

1 answer

424

memory management
Consider a direct mapped cache of size 16 KB and block size is 4 words. The word length is 16 bits. Find the number of bits needed for cache indexing if CPU generates 32 bit address

Deepika Bagaria asked in CO and Architecture Jan 30, 2016

by Deepika Bagaria

785 views

4 votes

1 answer

425

What is the sequence of memory access/operations when TLB, 2-level Page Table, Cache and Memory are in picture?

Gaurav Sharma asked in Operating System Jan 29, 2016

by Gaurav Sharma

934 views

6 votes

3 answers

426

Memory management and Virtual memory
Which page replacement policy sometimes leads to more page faults when size of memory is increased? A] Optimal B] LRU C] FIFO D] None of these.

Cruise Device asked in Operating System Jan 26, 2016

by Cruise Device

3.5k views

0 votes

1 answer

427

Memory management and Virtual memory
Match the pairs in the following question Pair - 1 A. Virtual Memory B. Shared Memory C. Look-ahead buffer D. Look-aside buffer Pair - 2 P. Temporal locality Q. Spatial locality R. Address translation S. Mutual exclusion

Cruise Device asked in Operating System Jan 26, 2016

by Cruise Device

2.4k views

1 vote

1 answer

428

How to calculate Physical Address corresponding to Logical Address
Represent the sentence "We are IT students" in physical memory if page size is 5 characters and the entries in page table are- 0 6 1 5 2 7 3 10 Assume physical memory size to be 55 characters

Richa Sharma asked in Operating System Jan 22, 2016

by Richa Sharma

2.6k views

2 votes

6 answers

429

Self doubt
Does fixed size partitioning suffer from external fragmentation?

shikharV asked in Operating System Jan 19, 2016

9.5k views

2 votes

1 answer

430

Calculating size of page table
Given answer: A. Please explain

shikharV asked in Operating System Jan 19, 2016

1.1k views

1 vote

3 answers

431

Finding maximum size of file
Given answer: 128 Please explain how to solve this problem

shikharV asked in Operating System Jan 19, 2016

974 views

1 vote

1 answer

432

MadeEasy Test Series: Operating System - Memory Management
The available main memory for loading processes is 128 MB which is divided into fixed number of partitions each of size 16 MB. If the processes of size 12 MB, and 6 MB are loaded into memory. The percentage of the internal fragmentation is ____________ (upto two decimal places)

khushtak asked in Operating System Jan 9, 2016

2.3k views

1 vote

1 answer

433

Himanshu1 asked in Operating System Jan 6, 2016

758 views

8 votes

1 answer

434

Segmented paging and paged segmentation
explain similarities and dismilarities between Segmented paging and paged segmentation

Pooja Palod asked in Operating System Jan 4, 2016

6.3k views

0 votes

1 answer

435

What is approximate size of page table

worst_engineer asked in Operating System Jan 4, 2016

by worst_engineer

870 views

3 votes

1 answer

436

Finding Hit Ratio when memory references are given in Hex
A byte addressable computer has a small data cache capable of holding eight 32 bit words. Each cache block consist of two 32 bit words. For the following sequence of addresses (in hexa decimal ). Find the hit ratio if two way ... is conflicting. You can check it here - https://gateoverflow.in/29182/cache-miss-in-two-way-set-associative ]

Tushar Shinde asked in CO and Architecture Dec 30, 2015

by Tushar Shinde

2.4k views

1 vote

2 answers

437

Memory Management
Which of the following problems can be overcome by virtual memory segmentation? a) Segmentation for overlays to deal with lack of physical memory b)Relocation of code and data address can be made segment local c)Protection of access e.g. read , write and execute segments. d) All of these.

Umang Raman asked in Operating System Dec 24, 2015

1.1k views

1 vote

1 answer

438

File System
Given the disk Capacity of 30 MB has block size 512 bytes and block/cluster is 4, the number of entries require in the FAT table is? a) 30*2^11 b) 30*2^20 c) 30*2^31 d) 30*2^9

Umang Raman asked in Operating System Dec 24, 2015

1.5k views

0 votes

1 answer

439

Operating System : Memory Mangement: Test series Basic level
A Computer system implements 8 kilobyte pages and a 32-bit physical address space. Each page table entry contains a valid bit, and the translation. If the maximum size of the page table of a process is 20 megabytes, then what will ... -2_47 The above question related to this gate question.But when I tried i got 33 bit but i choose 30 bits

Prasanna asked in Operating System Dec 20, 2015

553 views

0 votes

1 answer

440

Virtual Memory
What is the maximum process size that we can have in a 32 bit operating system?How is that limit calculated.

bahirNaik asked in Operating System Dec 10, 2015

611 views

3 votes

1 answer

441

Consider a system having demand paging system

worst_engineer asked in Operating System Dec 2, 2015

by worst_engineer

722 views

1 vote

1 answer

442

Finding maximum number of files possible in a file system?

shikharV asked in Operating System Nov 28, 2015

548 views

2 votes

1 answer

443

Calculating maximum number of files possible
Given answer: 8 Please explain

shikharV asked in Operating System Nov 28, 2015

466 views

1 vote

1 answer

444

Calculating total external fragmentation
Please check whether the given explanation is correct or not.

shikharV asked in Operating System Nov 28, 2015

7.7k views

1 vote

1 answer

445

External fragmentation in Best fit memory allocation policy
Assume 140K, 260K, 60K memory is free. What is the total external fragmentation that arises for the following requests 110K, 30K, 210K, 50K using Best-fit policy, assume no compaction A) 120K B) 110K C) 60K D)30K My ans: But the given answer is: Please explain.

dirac asked in Operating System Nov 13, 2015

by dirac

4.1k views

2 votes

1 answer

446

Can somebody explain me internal and external fragmentation in detail?
I always get confused between internal and external fragmentation.Is there any relation between them?pls explain in detail

Sandip Shaw asked in Operating System Nov 12, 2015

2.4k views

2 votes

2 answers

447

Q7 ch-5 memory org.
Let cache of 0.7 hit having average access time 9 times faster than that of memory. if average access time increases 40% from 80ns. What would be new hit ratio. A. 0.72 b. 0.36 c. 0.53 d. 0.80 My answer is 0.74 Am i correct?

khushtak asked in CO and Architecture Oct 25, 2015

1.6k views

2 votes

0 answers

448

Q 12-13 Common data ch-5 Ca
Consider two cache organization: the first one is 32 kB 2-way set associative with 32 B block size. The second one is of the same size but direct mapped. The size of an address is 32 bit in both cases. A 2 to 1 multiplexer has latency of 0.6 ns while a k-bit ... = 2.4 ns For 13. Op-d Only comparator latency =k/10 =17/10 = 1.7 ns Am i doing any thing wrong???

khushtak asked in CO and Architecture Oct 19, 2015

510 views

6 votes

1 answer

449

Virtual Memory
If i have a Reference string with S and page fault as N . then what is number of page fault when we take reverse of string sr ? 1)FIFO 2)LRU 3)MRU 4)OPTIMAL // i was given this question for 1 algorithm , but the i tried to find for all page replacement algorithm .

priti sharma asked in Operating System Oct 15, 2015

by priti sharma

1.2k views

2 votes

2 answers

450

Memory managment
Consider a system in demand paged enviorment supporting a virtual address of 32bits with a page size of 4KB, physical adddress is 29 bits . Page fault rate is 2% page fault service time is 20 ms and main memory access time is 2micro second . Page table contain ... what is effective memory acess time ? a)6MB,42O MICROSEC B)3MB, 420 microsec c)12MB , 419micro sec d)3MB , 42microsec

priti sharma asked in Operating System Oct 14, 2015

by priti sharma

1.6k views

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Recent questions tagged memory-management