Operating systems 116)According to page replacement algorithm, when a page fault occurs, the operating system divides all the pages into four classes based on the current values of thee R and M bits: Class 0: Page A, Page B, Page C Class 1: Page D, Page E Class 2: Page F. Page G Class 3: Page H. Page I, Page J 79. According to this classification, if a page fault occurs, what is the possibility of Page C to be evicted from the memory? A) %25 B) %33.3 C) %0 D) %10
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- Hide Assignment Information Instructions Programming Assignment One: This problem studies the effect of changing page sizes in a demand paging system. The following sequence of requests for program words is taken from a 460-word program: 10, 11, 104, 170, 73, 309, 185,245,246,434,458, and 364. Main memory can hold a total of 200 words for this program, and the page frame size will match the size of the pages into which the program has been divided. Calculate the page numbers according to the page size; divide by the page size, and the quotient gives the page number. The number of page frames in memory is the total number, 200, divided by the page size. For example, in problem (a) the page size is 100, which means that requests 10 and 11 are on Page 0, and requests 104 and 170 are on Page 1. Therefore, the number of page frames is two. a.) Find the success frequency for the request list using a FIFO replacement Algorithm and a page size of 100 words (there are two page…Operating sys :In the following producer and consumer problem using semaphores, explain with an example (semaphore values), how a producer sends a signal to a consumer, so that the consumer does not have to check the buffer all the time. /*program, Producer/Consumer */ semaphore n = 0; /* no of items in the buffer */ semaphore s = 1; /* ME semaphore */ void Producer () { while(TRUE) { produce(); wait(s); append(); signal(s); signal(n); } } void Consumer () { while(TRUE) { wait(n); wait(s); take(); signal(s); consume(); } }SHORTEST JOB FIRST SCHEDULINGAIM:To write a program to implement cpu scheduling algorithm for shortest job firstscheduling.ALGORITHM:1. Start the program. Get the number of processes and their burst time.2. Initialize the waiting time for process 1 as 0.3. The processes are stored according to their burst time.4. The waiting time for the processes are calculated a follows:for(i=2;i<=n;i++).wt.p[i]=p[i=1]+bt.p[i-1].5. The waiting time of all the processes summed and then the average time is calculate6. The waiting time of each processes and average time are displayed.7. Stop the program.
- Security: 1. Buffer overflow A C code example for Buffer Overflow is below: #include #define BUFFER SIZE 256 int main(int argc, char *argv[]) { char buffer[BUFFER SIZE]; if (argc <2) return -1; else { } strcpy(buffer,argv[1]); return 0; } (a) Explain the C code here on what it is doing. (b) Explain why buffer overflow may happen (c) Explain how you can modify the code to avoid buffer overflow.Shortest-Remaining-Time-First (Preemptive SJF): Write a Java program to implement a Shortest-Remaining-Time-First (Preemptive SJF) scheduling algorithm. Your program should first prompts the user to input a list of process ID, arrival time, and burst time (in ms) for each process to be run on the CPU. The list is terminated by 0 0 0 for the process ID, arrival time, and burst time. The program output should draw a Gantt chart (as text) that shows the scheduling order of the processes using the RR scheduling algorithm. Also print the turnaround, response, and waiting time for each process along with their average for all processes. Make sure to display very helpful messages to the user for input and output.Problem DescriptionThe Tower of Hanoi ProblemTower of Hanoi is a mathematical game consisting of three pegs (P1, P2 and P3) and a stack of disks of different diameters. Disks can slide onto any peg. The game starts with all disks stacked on P1 and ends at the point where all disks stacked on P3. The game player is required to move all disks from P1 to P3 using P2 as a buffer. Three rules must be followed when playing the game(1) Only one disk may be moved at a time.(2) Each move involves taking a disk on the top of a peg and place it on the top of another peg. (3) A disk of a larger diameter should never be placed on top of a disk of a smaller diameter. The diagrams below demonstrate the starting state and goal state of the game with 5 disks.Starting state Goal stateP1 P2 P3 P1 P2 P32RequirementsIn this assignment, students are required to solve the Tower of Hanoi (with five disks) using state space search algorithms implemented in Python.Two state space search algorithms: (1) a blind…
- Operating Systems Project:Design a process queue that is responsible for handling the process requests coming from different users. You have to take into consideration that users have different levels of privileges and priorities. Each user has an identification number and a password, in addition to process priorities. One good idea is to design the queue using an array or pointers while preserving the first-in-first-out concept of the queue. For every process request received, the program should check the privileges of that request and whether it can be moved forward in the queue to be served by the operating system prior to serving the other requests. Using the programming language of your choice (preferably C++), write the process queue that would handle the user request. The program must allow for requests coming from different users or from one user.Round-Robin (RR): Write a Java program to implement a Round-Robin (RR) scheduling algorithm with quantum q that will be entered by user. Your program should first prompts the user to input a list of process ID, arrival time, and burst time (in ms) for each process to be run on the CPU. The list is terminated by 0 0 0 for the process ID, arrival time, and burst time. The program output should draw a Gantt chart (as text) that shows the scheduling order of the processes using the RR scheduling algorithm. Also print the turnaround, response, and waiting time for each process along with their average for all processes. Make sure to display very helpful messages to the user for input and output.1. Explain the concept and the cause of the memory leak. 2. Explain the idea of garbage collection and how it is related to current heap links
- CPU Priority Scheduling-preemptive: Write a Java program to implement a priority scheduling algorithm that uses low number to represent high priority. Your program should first prompts the user to input a list of process ID, arrival time, burst time, and priority for each process to be run on the CPU. The list is terminated by 0 0 0 0 for the process ID, arrival time, burst time, and priority. The program output should draw a Gantt chart (as text) that shows the scheduling order of the processes using the Priority scheduling algorithm. Also print the turnaround time, response time, and waiting time for each process along with their average for all processes. Make sure to display very helpful messages to the user for input and output.Cache Memory Caches depend on the locality principle – if you access memory locations near to each other, then you will get better performance because the cache will pull in a bunch of nearby locations every time you access main memory. Assume that multi-dimensional arrays in C are stored in “row major order”, that is, the elements in each row are stored together Example: int test[3][5] = { {1, 2, 3, 4, 5}, {6, 7, 8, 9, 10}, {11, 12, 13, 14, 15} } Would be laid out in memory like: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Which of these two programs fragments (a or b) should have better cache performance? You need only answer “a” or “b” – no explanation needed. // begin fragment a int big[100,1000]; for (i=0, i<100, i++) { for (j=0, j<999, j++) { big[i,j] += big[i,j+1]; } } // end fragment a // begin fragment b int big[100,1000]; for (j=0, j<999, j++) { for (i=0, i<100, i++) { big[i,j] += big[i,j+1]; } } // end fragment bMicroprocessor lab tasks - Solve the problems in assembly language using emu8086 solution format .MODEL SMALL .STACK 100H .DATA ; DEFINE YOUR VARIABLES HERE .CODE MAIN PROC MOV AX, @DATA MOV DS, AX ; YOUR CODE STARTS HERE ; YOUR CODE ENDS HERE MOV AX, 4C00H INT 21H MAIN ENDP END MAIN Collapse :white_tick: 1 Problems : Task 01 a program that takes in 3 digits as input from the user and finds the maximum Sample input: 1st input: 1 2nd input: 2 3rd input: 3 Sample Output: 3 Task 02 Take two digits as input from the user and multiply them. If the result is divisible by 2 and 3 both, print "Divisible". Otherwise, print "Not divisible" Sample input: 1st input: 5 2nd input: 6 Result is 30 Sample Output: Divisible Sample input: 1st input: 5 2nd input: 2 Result is 10 Sample Output: Not divisible