What is the average response time (rounded to two decimal places) under STCF of the following workload?:

• Job A arrives at time 0s and needs to run on the CPU for 60s
• Job B arrives at time 5s and needs to run on the CPU for 10s
• Job C arrives at time 10s and needs to run on the CPU for 3s

Note: assume that switching between processes is instantaneous (i.e., takes no time). Also assume that if the scheduler is preemptive, then it can make the decision to switch between jobs at any given time (i.e., as soon as another process arrives)

What is the average turnaround time (rounded to two decimal places) under STCF of the following workload?:

• Job A arrives at time 0s and needs to run on the CPU for 60s
• Job B arrives at time 5s and needs to run on the CPU for 10s
• Job C arrives at time 10s and needs to run on the CPU for 3s

Note: assume that switching between processes is instantaneous (i.e., takes no time). Also assume that if the scheduler is preemptive, then it can make the decision to switch between jobs at any given time (i.e., as soon as another process arrives)

What is the average response time (rounded to two decimal places) under SJF of the following workload?:

• Job A arrives at time 0s and needs to run on the CPU for 60s
• Job B arrives at time 5s and needs to run on the CPU for 10s
• Job C arrives at time 10s and needs to run on the CPU for 3s

Note: assume that switching between processes is instantaneous (i.e., takes no time). Also assume that if the scheduler is preemptive, then it can make the decision to switch between jobs at any given time (i.e., as soon as another process arrives)

We used a time-sharing method for virtualizing the CPU where only one process runs at a time (on a uniprocessor), so why don't we use a time-sharing model for virtualizing memory where only one process is in physical memory at a time?

The old UNIX file system was very similar to Very Simple File System (vsfs). Which of the following contributed to the system having poor performance?