Computers and Technology, 09.10.2019 00:00, vperez719

In a system with non-preemptive scheduling, the cpu scheduler is invoked when: (a) a process switches from the running state to the waiting state (b) a process switches from the running state to the ready state (c) a process switches from the waiting state to the ready state (d) a process switches from the new state to the ready state

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Computers and Technology, 21.08.2019 00:10, caylah6101

On which events is the cpu scheduler invoked for a kernel with cooperativescheduling (select all that apply) ? a) when a process calls exit() b) when the time slice of a process expires c) when a process makes a read system call to read from a file d) when an i/o interrupt occurs and the running process switches from the running state to the ready state

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Computers and Technology, 05.10.2019 04:10, vliu470

Question 4 (1 points): consider a multi-level feedback queue scheduler with 4 priority levels: • priority 3 (highest), where processes run with a 1 ms quantum • priority 2, where processes run with a 5 ms quantum • priority 1, where processes run with a 10 ms quantum; and • priority 0 (lowest), where processes run with a 100 ms quantum whenever a process finishes running without using its entire time quantum, it is moved up to a higher priority level (except if it is already at the highest priority level) for the next time it is runnable. if a process is still runnable after using its entire quantum, it is moved down to a lower priority level (unless it is already at the lowest priority level). within each priority level, the scheduler uses round-robin suppose this scheduler is running two processes: * process a which alternates between performing 5 ms of computation and starting and waiting for an i/o operation that takes 50 ms to complete process b which alternates between performing 15 ms of computation and starting and waiting for an i/o operation that takes 25 ms to complete after the processes are running for a long time, a. o process a will alternate between priority 2 and priority 1, while process b will alternate between priority 1 and priority 0 b. o process a will alternate between priority 3 and priority 2, while process b will alternate between priority 2 and priority 1 c. o process a will alternate between priority 3 and priority 2, but process b might never run d. o process a will be at priority 3 whenever process b is waiting for its i/o, and at priority 2 whne process b is ready or running e. o process a will alternate between priority 3 and priority 2, while process b will alternate between priority 1 and priority 0 f. o none of the above

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Computers and Technology, 22.10.2019 19:00, trobbie817

Implement the following 3 cpu scheduling algorithms • simulate and evaluate each with the set of eight processes below. • use any programming language. the program listing should be submitted with the report. 1. fcfs non-preemptive (partial results provided) 2. sjf non-preemptive 3. mlfq multilevel feedback queue (absolute priority in higher queues) queue 1 uses rr scheduling with tq - 5 queue 2 uses rr scheduling with tq - 10 queue 3 uses fcfs all processes enter first queue 1. if time quantum (tq) expires before cpu burst is complete, the process is downgraded to next lower priority queue. processes are not downgraded when preempted by a higher queue level process. once a process has been downgraded, it will not be upgraded. assumptions: 1. all processes are activated at time 0 2. assume that no process waits on i/o devices. 3. after completing an i/o event, a process is transferred to the ready queue. 4. waiting time is accumulated while a process waits in the ready queue. 5. turnaround time is a total of (waiting time) + (cpu burst time) + (1/0 time) 6. response time is the first measure of waiting time from arrival at time 0 until the first time on the cpu. process data: process goes cpu burst, i/o time, cpu burst, 10 time, cpu burst, 10 last cpu burst p1 {5, 27, 3, 31, 5, 43, 4, 18, 6, 22, 4, 26, 3, 24,4} p2 {4, 48, 5, 44, 7, 42, 12, 37, 9, 76, 4, 41, 9, 31, 7, 43, 8} p3 (8, 33, 12, 41, 18, 65, 14, 21, 4, 61, 15, 18, 14, 26, 5, 31, 6} p4 (3, 35, 4, 41, 5, 45, 3, 51, 4, 61, 5, 54, 6, 82, 5, 77, 3} p5 (16, 24, 17, 21, 5, 36, 16, 26, 7, 31, 13, 28, 11, 21, 6, 13, 3, 11,4} p6 (11, 22, 4, 8, 5, 10, 6, 12, 7, 14, 9, 18, 12, 24, 15, 30, 8} p7 (14, 46, 17, 41, 11, 42, 15, 21, 4, 32, 7, 19, 16, 33, 10} p8 (4, 14, 5, 33, 6, 51, 14, 73, 16, 87, 6}

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