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Operating Systems Sessional: Mid-Term Examination Archive

Mid Term Examination: July–December 2023

Course Code: CIT 322 | Course Title: Operating Systems Sessional Session: 2020-21 | Program: B.Sc. Engg.(CSE) | Semester: 6th Total Marks: 15 | Instructions: Answer the marked questions.

SET-A (Answer any one from 1 to 3)

1. Implement Peterson’s solution for ensuring synchronization. [07]

2. Implement mutex locks to ensure synchronization.

3. Semaphore implementation to solve busy waiting problem.

SET-B (Answer one from 4–5; Question 6 is mandatory)

[✓] 4. Multithreading Basics [04]

Write a code to demonstrate how to create and start Python’s or Java’s threads using the threading module (or Thread class).

• It should run a function print_name that prints a name along with provided arguments.

• This example should create two threads, start them using the start() method, and wait for completion using the join() method.

5. Concurrent Calculation [04]

Write code to use Python’s or Java’s threading module to calculate the square and cube of a number concurrently.

• Create two threads (t1 and t2) for these calculations.

• Print results in parallel and print “Done!” only when both threads finish.

• Note: Threading is used to achieve parallelism and improve performance for computationally intensive tasks.

6. Linux Command Operations [04]

Perform/Explain the following terminal operations:

1. Display information about files in the current directory.

   ls
   ls -lah

2. Create a directory with your own student name; inside it, create a file. Then create a directory in the home directory and copy the previously created file there.

   mkdir sharafat
   touch text.txt
   cp /home/sharafat/sharafat/test.txt /home/sharafat/test
   cp test.txt ~/test

3. Navigate between different folders.

   cd

4. Remove empty directories from the directory list.

   find . -type d -delete

5. File copy/cut and paste operations via terminal.

   cp source/ destination/
   mv source/ destination/

6. Download files from the internet.

   wget URL
   aria2c URL

7. Display the current user’s name.

   whoami
   echo $USER

8. View the calendar in the terminal.

   cal
   cal 8 11 2002

9. Check the details of the file system.

   neofetch
   fastfetch
   lscpu
   lsblk

10. Check lines, word count, and characters in a file using different options.

    wc filename
    wc -l filename
    wc -c filename
    wc --help

Mid Term Examination: July–December 2022 (PART-B)

Course Code: CIT 322 | Course Title: Operating Systems Sessional

Session: 2019-20 | Program: B.Sc. Engg.(CSE) | Semester: 6th

Total Marks: 08

1. Compiling Environment: Running a C/C++ Program in Linux. [02]

   g++ input.cpp
    .\a.exe

2. Linux Shell Commands: Use commands to perform the following: [06]

   • (i) Show home directory of your user.

     echo $HOME

   • (ii) List files in the current directory.

     ls

   • (iii) Change directory.

     cd

   • (iv) Create a folder/directory.

     mkdir name

   • (v) Delete files and directories.

     rm filename

   • (vi) Create a file.

     touch file.txt

   • (vii) Access manual pages (help) for a command.

     ls --help
     man ls

   • (viii) Change file permissions (make a file executable).

     chmod +x filename

   • (ix) Move files via command line.

     mv source/ destination/

   • (x) Locate a file in the system.

     ls -R | grep input.jpg

   • (xi) Check server connectivity (ping).

     ping 9.9.9.9
     ping -c 5 sharafat.xyz

   • (xii) Redirect data/text into a file.

     ping -c 5 sharafat.xyz > file.txt

Mid Term Examination: July–December 2021

Course Code: CIT 322 | Course Title: Operating Systems Sessional

Session: 2018-19 | Program: B.Sc. Engg.(CSE) | Semester: 6th

Total Marks: 15 | Instructions: Answer questions 1, 2, 3 and marked questions.

1. Installation of Linux with Virtual Machine. [01]

2. Running a C/C++ Program in Linux. [02]

   g++ input.cpp
    .\a.exe

3. Running a Java Code in Linux. [02]

   javac Main.java
   java Main

   [✓] 4. System Administration & Navigation Commands: [10]

   • List home directory, navigate folders, and create/delete files/directories.

   • Check disk space in partitions.

     lsblk

   • Run commands with administrative/root privileges (sudo).

     sudo commmand

   • Compress files into a .zip archive.

     zip compressed.zip file_1 file_2 ...

   • Check disk usage of a specific file.

     du -h compressed.zip

   • Check network connection.

     ping sharafat.xyz

Mid Term Examination: July–December 2020

Course Code: CIT 322 | Course Title: Operating Systems Sessional

Session: 2017-18 | Program: B.Sc. Engg.(CSE) | Semester: 6th

Total Marks: 15 | Instructions: Answer the marked questions.

1. FCFS Scheduling Analysis [10]

Consider three CPU-bound processes arriving at an FCFS scheduler:

Process	Arrival Time	Duration (Burst)
$P_1$	0	3
$P_2$	1	12
$P_3$	5	1

• Tasks: Give the schedule (Gantt Chart) and compute the average waiting time.

• Analysis: Define the “Convoy Effect.” Provide an alternative arrival order that improves average waiting time and a second order that demonstrates the convoy effect.

2. Comparative Scheduling [10]

Compare the average waiting time for FCFS, SJF, and SRTF for the following processes:

Process	Arrival Time	Burst Time
$P_1$	0	8
$P_2$	3	3
$P_3$	5	4
$P_4$	6	6

3. Algorithm Simulation

[✓] 3. Simulate the CPU scheduling algorithm Round-Robin. [10]

4. Simulate the Priority Scheduling algorithm (Random). [10]

5. Simulate the First Come First Serve (FCFS) algorithm. [10]

6. Simulate the Shortest Job First (SJF) (Non-Preemptive) algorithm. [10]

7. Simulate the Shortest Job First (SJF) algorithm. [10]

8. Simulate the Shortest Remaining Time (SRT) algorithm. [10]

9. Linux Customization & Management [05]

[✓] Tasks:

1. Change wallpaper and screensaver via Linux command line.

   gsettings set org.gnome.desktop.background <<image-name/path>>

2. Create a directory (student name), create a file within, and copy it to a new directory in the home folder.

   mkdir sharafat
   touch text.txt
   cp /home/sharafat/sharafat/test.txt /home/sharafat/test
   cp test.txt ~/test

3. Create disk partitions.

   lsblk

4. Install and configure a printer.

5. Perform file copy, cut, and paste operations.