Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Operating System Expert

Basic problems:

1) Assume we have 3 processes running at the same time as shown in the following table. Each resource only has one instance.

i) Show a possible situation of resource allocation which results in deadlock. Use a resource allocation graph to show the scenario.

ii) To prevent the possibility of any deadlock, you might alter the order of getting resource requests of some process. Describe how and why. You could also use a resource allocation graph to  justify the answer.

     P1                                        P2                                      P3
while (1) {                               while (1) {                           While (1)
          get(A);                           get(D);                                get(C);
          get(B);                            get(E);                                get(F);
          get(C);                            get(B);                               get(D);
          // critical region                 // critical region                  // critical region
          // use A, B, C                     // use D, E, B                     // use C, F, D
          release(A);                           release(D);                        release(C);
          release(B);                         release(E);                         release(F);
          release(C);  }                       release(B);    }                  release(D);}

2) Consider the following snapshot of the system, answer the following problems using the banker's algorithm:

i) What is the content of the matrix Need? Is the system in a safe state?

ii) If a request from Process P1 arrives for (0,4,2,0), can the request be granted immediately?

(Please show the middle steps besides final answer)

Process    Allocation ABCD    Max ABCD    Available ABCD

P0              0 0 1 2              0 0 1 2         1 5 2 0

P1              1 0 0 0              1 7 5 0

P2              1 3 5 4              2 3 5 6

P3              0 6 3 2              0 6 5 2

P4              0 0 1 4               0 6 5 6

3) Compare contiguous-memory allocation with pure paging in the following aspects:

i) In support of dynamic memory allocation: most systems allow programs to allocate more memory to its address space during execution.  Heap and stack are exs of such allocated memory.

ii) External fragmentation and internal fragmentation.

iii) Ability to share code across processes.

4) Consider a computer system with a 32-bit logical address and 4KB page size. The system supports up to 512MB of physical memory. How many entries are there in a conventional single-level page table? How many entries are there in an inverted page table? What are the page numbers and offsets for the following address references: a) 30000, b) 256, c) 0xbcf034

5) Consider the following C program where M, N, K are predefined constants. Suppose int is 4 bytes. Assume this program is run on a machine with 4KB page size and 32 TLB entries. Firstly, TLB is empty. FIFO is used as the replacement algorithm for TLB. 
int X[N];
for (int k = 0; k < K; k++)
   for (int i = 0; i < N; i += M) 
       X[i] = random(); //generate some random number

a) If K is 1, what values of M and N will cause a TLB miss for every access of array X. describe why.

b) If K is a very large number, what values of M and N will cause TLB miss for every access of array X. describe why. 

6) Assume a logical address space is 1KB, and the page-size is 16 bytes. Suppose no page is in the main memory for this process at first and the pure demand paging is used. present free frame list is {2,5,8,1,…}.  The first frame in the free frame list would be used whenever needed. Assume TLB has two entries. Both TLB and page table are empty initially. FIFO is used as TLB replacement algorithm. Assume the following logical address is accessed in order: 0x3d,0x30,0xe5,0x7d, 0x33, 0xef. For each of the following address access:

i) State the physical address which is mapped to it.

ii) Assume it takes 10 ns to access TLB, and 100ns to access memory, and 8ms to handle page fault. How long time it takes to access this address?
(Please show the intermediate steps besides final answer)

7) Suppose there are only 4 page frames in the physical memory, for the following reference string:
 1, 2, 3, 4, 5, 3, 4, 1, 6, 7, 8, 7, 8, 9, 7, 8, 9, 5, 4, 5, 4, 2, 8.

a) What is minimum number of page faults for the optimal page replacement strategy? Please show how the page is placed and how page faults occur.

b) How many page faults occur using LRU? Please show how the page is placed and how page faults occur.

8) Consider a demand-paging system with the following time-measured utilizations:   CPU utilization: 10%, Paging disk: 98%, Other I/O devices: 5%. What does this mean? How to improve CPU utilization (Think about both hardware solutions and software solutions). Describe why.  List at least 3 possible solutions.

Operating System, Computer Science

  • Category:- Operating System
  • Reference No.:- M91143

Have any Question? 


Related Questions in Operating System

Question information technology planningassignment

Question: INFORMATION TECHNOLOGY PLANNING Assignment Overview This module is about the problems of creating information technology plans that work within the scope of the organization''s strategic objectives. It is also ...

Question 1an important service provided by any system is

Question 1: An important service provided by any system is the ability to run a process on a predetermined schedule without human intervention. The "automation" of tasks can reduce the workload of the system administrato ...

Lab-file processingobjectivesbulladd persistent data

Lab-File Processing OBJECTIVES • Add persistent data storage to your Week 4 Lab using text file input/output. PROBLEM: Stocks4U Portfolio Management System The portfolio management system you developed for Stocks4U needs ...

Operating system proposalobjectivesyour organization is

Operating System Proposal Objectives Your organization is right now researching the utilization of Linux. Your supervisor has solicited you to look into the possibility from utilizing Linux as a part of both the server a ...

Securing operating systemsin this document of 2-3 pages

Securing Operating Systems In this document of 2-3 pages, respond to the following: • Describe the specific security concerns or risks that your chosen operating system is exposed to and how you plan to mitigate the risk ...

Operating systems- homeworkpurposethe purpose of this

Operating Systems- Homework Purpose The purpose of this exercise is to understand how creating files affects the available disk space and the available i-nodes on a disk partition on Linux/UNIX. Assignment Create and lea ...

Goals1 to gain hands-on experience with fork exec and wait

Goals: 1. To gain hands-on experience with fork(), exec(), and wait() system calls. 2. To master the basics of multi-process application development. 3. To appreciate the performance and fault-tolerance bene_ts of multi- ...

The following machine description will provide the basis

The following machine description will provide the basis for this assignment. You will create a virtual machine/operating system for the machine described below that will accept programs in the target machine language. T ...

Web server practical-1 you are required to configure and

Web Server Practical- 1) You are required to configure and test a Web server to provide web hosting services to a client computer. Install and configure a web server, serving out a default web page that you have created. ...

Linux implementation proposalphelpstech llc has a new

Linux Implementation Proposal PhelpsTech, LLC. has a new research and development group - Medals. All systems in Medals will run the Linux operating system and will access resources, as well as share resources, with Phel ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate