Process Priority Еxec 1/0 Еxec 1/0 P1 4 4. 3. 2 P2 3 2 P3 1 3 4 1 P4 1 4 1 Assume that a Round-Robin Scheduling works with a quantum time of 3, but the scheduler selects the process with highest priority from the queue (NOT those arrived earliest), other than currently pre-empted process. Draw the timeline for CPU- and I/0- bursts for these processes
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- Assume that there are the following processes in the deadline scheduler queue: Process Arrival Runtime Period Deadline 1 0 2 12 10 2 2 4 20 16 3 4 3 15 14 Complete the following schedule so each of the processes adheres to the deadline policy by replacing a dot with a process number (as necessary): TIME: 01234567890123456789012345678901234567890123456789 PROCESS: 112222333.......................................If you are working with scheduling policies, you are requested to investigate the variation of round robin in which a process that has used its full time quantum is returned to the end of the READY queue, while one that has used half of its time quantum is returned to the middle of the queue and one that has used one-fourth of its time quantum goes to a place one-fourth of the distance away from the beginning of the queue. Identify the user group that would find this most advantageous. Describe the unique threats to a data centre posed by disgruntled employees. Describe how you would identify such people, if possible, and how you would protect your system from these threats. What are the parameters that affect the efficiency of the round robin?If you are working with scheduling policies, you are requested to investigate the variation of round robin in which a process that has used its full time quantum is returned to the end of the READY queue, while one that has used half of its time quantum is returned to the middle of the queue and one that has used one-fourth of its time quantum goes to a place one-fourth of the distance away from the beginning of the queue. Question 5 Explain the advantages and disadvantages of this scheduling policy. Identify the user group that would find this most advantageous. Describe the unique threats to a data centre posed by disgruntled employees. Describe how you would identify such people, if possible, and how you would protect your system from these threats. What are the parameters that affect the efficiency of the round robin?
- We define an m-section to be a sequence of code that can be run concurrently by maximum m threads. There are n threads in a process. Each thread executes a thread function doWork() that calls doCriticalWork() in an infinite loop. Function doCriticalWork() requires that at most m threads run it concurrently. The enter() and leave() functions are used to limit the number of threads within the m- section to a maximum of m and are the only functions that deal with synchronization. The pseudo-code algorithm for the thread function is this: void doWork(...) { while (true) { enter(...); I/ limit access to m threads Il execute m-section doCriticalWork(.); Il run by max. m threads leave(.); I/ leave m-section Il do more work Function enter() returns immediately only if there are less than m threads in the m-section. Otherwise, the calling thread will be blocked. A thread calls leave() to indicate it has finished the m-section. If there was another thread blocked (in enter() waiting to enter the…Assume that the Ready Queue contains several Processes with varying burst times. If the scheduling algorithm is Round Robin with a time quantum longer than the burst times of all processes, which processes will be completed first? Your response: o Initial Procedure O Final Procedure The quickest method • Longest Process?? O Process with a burst time equal to time quantum (q)Finally, suppose the 3 processes in question 3b always terminate in the reverse order in which they are first admitted to the ready queue (you may ignore turnaround times). Briefly describe a scheduling policy that ensures this happens. Your description should clearly state the selection function and decision mode for the policy.
- A database is to be shared among several concurrent threads. Some of these threads may want only toread the database (readers), whereas others may want to update (that is, to read and write) the database(writers). Design an algorithm in pseudocode to guarantee fairness between processes such that: no datainconsistency will occur, the readers can read simultaneously, all the readers are to read before writers.Explain on your code how you satisfy these constraints.2 Recall the various deadlock detection and prevention algorithms we've discussed in class and consider the following snapshot of a system with five processes (P10, P11, P12, P13, P14) and four resources (R1, R2, R3, R4). R1, R2, R3, and R4 have a total of 11, 13, 7, and 9 resources, respectively. There are no current outstanding queued unsatisfied requests. Table 1: Allocation Table 2: Max R3 R4 PID R.1 R2 R3 R4 PID R1 10 4 11 3 12 1 215 2 1 3 10 13 0 5 0 14 1 3012 4 11 12 012 1 13 1 14 231323 75524 R2 5 5 432300 36373 8 Is the system currently in a safe or unsafe state? If safe, provide the process execution order. If unsafe explain your answer.Suppose we're using a priority scheduling algorithm. Suppose then, we notice the high priority processes have so much work to do, that some of the low priority processes are starving. Fill in the blanks to one potential solution: Incrementally [Select] is [Select] [Select] ✓the priority of a process, while it Eventually, when it [Select] its priority.
- I need to implement in C the First-come, first-served (FCFS), which schedules tasks in the order in which they request the CPU. Priorities range from 1 to 10. Where the file driver.c reads in the schedule of tasks, inserts each task into a linked list, and invokes the process scheduler by calling the schedule() function. The schedule() function executes each task according to the specified scheduling algorithm. Tasks selected for execution on the CPU are determined by the pickNextTask() function and are executed by invoking the run() function defined in the CPU.c file. A Makefile is used to determine the specific scheduling algorithm that will be invoked by driver.OPERATING SYSTEM Suppose, there are three producers P1, P2, and P3 who want to produce and put items in the buffer. And, there are four consumers C1, C2, C3, and C4 who want to consume items from the buffer. No process takes more than 5 units of time to complete unless the process goes to the waiting queue(S->list) of semaphore. At a certain point of the execution, following are the values of the semaphores: mutex=1 , countEmpty=8, countFull=2 Find the output of the following sequence of commands. At time 0 : C1 started At time 0: C2 started At time 10: C3 started a) What is the Value of countEmpty? What is the Value of countFull? What are the Processes in the waiting queue of the semaphore? At time 15 : P1 started At time 20 : P2 started b) What is the Value of countEmpty? What is the Value of countFull? What are the Processes in the waiting queue of the semaphore? At time 25 : C4 started At time 30 : P3 started c) What is the Value of countEmpty? What is the Value of…A deadlock occurs when a group of processes is stalled because one process is holding a resource and waiting for another process to obtain it. Consider the situation when two trains are approaching each other on the same track and there is only one track: once they are in front of each other, neither train can proceed. In operating systems, a similar scenario happens when two or more processes possess certain resources while waiting on resources owned by other processes (s). In the picture below, Process 1 is holding Resource 1 and waiting for Process 2 to acquire Resource 2, while Process 2 is waiting for Resource 1. Give an example of a realistic deadlock avoidance approach and describe the basic strategy behind it.