Recent questions tagged memory-management

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1

Logical Address in Paging
In paging, we know that the no. of bits for page offset is same and depends upon the size of the page size. However, the rest of the bits of the logical address somehow determines the no. of pages of the process and thus the size of ... offset (constant) ) and thus two process of different sizes have different length logical addresses? Is it the scenario where we use PTLR?

asked 3 days ago in Operating System by Harsh Kumar (17 points) | 29 views

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2

Self doubt
Explain Last In First Out (LIFO) and MRU with this example and find a number of a page fault. Question: Let the number of the frame in main memory is 5. Reference String: 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10

asked Apr 13 in Operating System by Raj Kumar 7 Junior (837 points) | 20 views

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1 answer

3

self - doubt
Physical memory are divide into frame. The frame of each size are equal. Is the word size in each frame same or it may possible to different in size ? (I am taking about word size in two different frame in main memory. )

asked Apr 8 in Operating System by Raj Kumar 7 Junior (837 points) | 18 views

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4

DMRC AM-IT, Virtual memory
The lookup page table shown below is for a job in a paged virtual storage system with a page size of 1024 locations. Each virtual address is in the form [p,d] where p is page number and d is displacement in the page. Virtual page Actual page 0 3 1 --- 2 4 3 0 A virtual address of [0,514] maps to an actual address of A) 512 B)1538 C)3586 D)4514

asked Mar 31 in Operating System by Lalit Verma (33 points) | 71 views

+2 votes

1 answer

5

Memory interfacing
A memory constructed with 2B words and capacity of memory $2^{18}$ bits. Number of decoder required and type of decoder if memory built using $1K\times 4$ RAM chips? (if possible give some reference and diagram)

asked Mar 24 in CO & Architecture by srestha Veteran (81.7k points) | 103 views

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1 answer

6

Operating Systems Paging
Using the page table shown below, translate the physical address $25$ to virtual address. The address length is $16$ bits and page size is $2048$ words while the size of the physical memory is four frames. Page Present (1-In, 0-out) Frame $0$ $1$ $3$ $1$ $1$ $2$ $2$ $1$ $0$ $3$ $0$ - $25$ $6169$ $2073$ $4121$ How to solve this

asked Mar 24 in Operating System by gauravkc Active (4.9k points) | 73 views

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7

Operating System
Whenever Questions like:- (Example is shown below) is given and asked that say what is the turnaround time for $6k$ Process then we will always assume memory to have fixed length partition right??? cuz they have given different partition sizes in $KB$ so say if a process allocates $2k$ ... {0.1cm} 2\hspace{0.1cm} 1\hspace{0.1cm} 4\hspace{0.1cm} 1\hspace{0.1cm} 8\hspace{0.1cm} 6$

asked Mar 21 in Operating System by Na462 Active (1.6k points) | 26 views

+1 vote

1 answer

8

Operating Systems #Page-table-size
Main-Memory Size=64MB, Logical address-32bits long, Page size-4KB, What is the total space wasted in maintaining the page table? Soln- 220(No. of pages) * 2B(14bits~2B)(frame-address-bits) = 2MB In this question why we consider the total ... page table entries? I don't know why such confusions come in such a crucial time! Please answer and clear my confusion asap!

asked Jan 26 in Operating System by Ashish Goyal 3 (55 points) | 63 views

+1 vote

1 answer

9

Memory Management
This question was asked in one of the assignments: http://www.cs.utexas.edu/~lorenzo/corsi/cs372/06F/hw/3sol.html But I'm not clear with the explanation. Can someone please explain how to solve this?

asked Jan 24 in Operating System by Akundi Prathyusha (129 points) | 73 views

+2 votes

0 answers

10

book volume-2 ACE ,memory management
Consider a logical address space of eight pages of 1,024 words each, mapped on to a physical memory of 32 frames. a)How many bits are in logical address? b)How many bits are in physical address?

asked Jan 14 in Operating System by meethunjadhav (163 points) | 78 views

+2 votes

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11

Operating system
Please explain in detail

asked Jan 13 in Operating System by Harikesh Kumar Active (1.4k points) | 86 views

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1 answer

12

virtual address size

asked Jan 13 in Operating System by pranab ray Junior (895 points) | 105 views

+2 votes

1 answer

13

Memory allocation Doubt
Consider the requests from processes in given order $300K$, $25K$, $125K$ and $50K$. Let there be two blocks of memory available of size $150K$ followed by a block size $350K$. Which of the following partition allocation schemes can satisfy above requests ... process of $200KB$ then a process with size $100KB$ can't be allocated to this partition. Which approach is correct?

asked Jan 10 in Operating System by atul_21 Active (3.6k points) | 98 views

+2 votes

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14

Memory Management
Please Explain.

asked Jan 8 in Operating System by Shubham Kumar Gupta Junior (513 points) | 65 views

+1 vote

0 answers

15

Segmented Pagging
Consider a system using segmented paging architecture. The segment is divided into 1K pages and each page is having 512entries. The segment number requires 13 bits to represent all the segments of LAS, and the frame number requires 18 bit to represent all the frame of PAS ... page table entry is 4 Word. Then what is the size of each page table? What is the size of all page tables?

asked Jan 8 in Operating System by Shubhanshu Boss (14.9k points) | 106 views

+1 vote

2 answers

16

Paging- Memory Management
A system support 32 bit virtual address with a page size of power of 2. Page table entries 32 bit wide. The page size in KB of the system should be ____ in order to make sure that the page table fits exactly in one frame of memory.

asked Dec 30, 2017 in Operating System by amIndian (71 points) | 197 views

+1 vote

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17

paging
Consider a system with 2 level paging applicable the page table is divided into 8K pages each of size 16 KB. The memory is byte addressable if the physical address space is 128 MB which is divided into 4KB frames. The page table entry size of outer page table is 32 bits and page table entry size ... and outer page table. a) 32 KB, 128 KB b) 32 KB, 32 KB c) 128 KB, 128 KB d) 128 KB, 32 KB

asked Dec 29, 2017 in Operating System by Abhishek Kumar Singh Junior (923 points) | 84 views

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2 answers

18

Operating System Paging ISI
A 32-bit machine has a page/frame size of 1 KB. (i) What is the size of the complete first-level (primary) page table for a process? (ii) If page tables are also stored using paging, how many levels of paging will be required?

asked Dec 21, 2017 in Operating System by kauray (299 points) | 98 views

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19

Operating Systems Paging
In a paging-based memory management system, the page table for a process contains the physical addresses of the pages in that process' address space. Consider a memory management system on a machine with a 32-bit address bus that uses a ... for storing additional information about a page (besides the physical address of the corresponding frame) in each page table entry?

asked Dec 20, 2017 in Operating System by kauray (299 points) | 60 views

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20

Operating System Demand Paging
In a demand-paged system, it takes 100 nanoseconds to access memory. The page table has 8 entries and is held in registers. It takes 10 milliseconds to service a page fault if an empty frame is available or if the victim frame is not ... is dirty 80% of the time, find the maximum page fault rate for which the effective memory access time remains within 200 nanoseconds

asked Dec 20, 2017 in Operating System by kauray (299 points) | 79 views

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21

Operating system memory
There are 5 processes having an average size of 100k. Average size of hole is 60k. Percentage of memory wasted in holes? 76 37 23 None

asked Dec 19, 2017 in Operating System by amIndian (71 points) | 71 views

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22

[OS] Page table Size. Made easy advance test Series

asked Dec 18, 2017 in Operating System by rahul sharma 5 Boss (22.7k points) | 112 views

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1 answer

23

Memory Management
Suppose you have a computer system with a $48-bit$ logical address, page size of $16KB$ and $4 bytes$ per page table entry. If we have a $48MB$ program such that the entire program and all necessary page tables are in memory. How much memory is used by program, including its page tables?

asked Dec 15, 2017 in Operating System by ankitgupta.1729 Active (4.2k points) | 82 views

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24

IES ESE
A disc drive has a average seek time of 10ms, 32 sectors on each track and 512 bytes per sector. If the average time to read 8kbytes of continuously stored data is 20ms, what is the rotational speed of the disc drive? 3600 rpm 6000 rpm 3000 rpm 2400 rpm

asked Dec 8, 2017 in Operating System by anshgyl (7 points) | 49 views

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25

What is page size

asked Dec 3, 2017 in Operating System by student2018 Active (1k points) | 58 views

+1 vote

1 answer

26

Address Space
I am little bit unclear about Linear,Logical and Physical Address. Can anybody tell which is accessed when and how? or any valid documentation to read plz

asked Nov 26, 2017 in CO & Architecture by Na462 Active (1.6k points) | 43 views

+1 vote

2 answers

27

Suppose that cache access time is 7 ns, main memory access time is 50 ns and disk space access time is 1200 ns.

asked Nov 18, 2017 in Operating System by Rohit Gupta 8 Active (2.1k points) | 154 views

+2 votes

1 answer

28

Dynamic and Static Linking
Does the dynamically linked files are slower in execution as compared to static linked files?

asked Nov 16, 2017 in Operating System by Mk Utkarsh Boss (11.7k points) | 91 views

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29

Doubt_in_Addressing
Though its a trivial doubt but i want to ask Here in this question : Given is 36bit virtual address means We can address every bit which of address space with 36bits now considering bytes we just need 33bits Right? Because each 8bit will be grouped Here Its mentioned that $2^{^{36}}Bytes$. So please comment on this.And correct me !

asked Nov 15, 2017 in Operating System by saxena0612 Boss (11.3k points) | 67 views

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1 answer

30

operating system

asked Nov 12, 2017 in Operating System by Ravi prakash pandey Junior (751 points) | 86 views

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